10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File Number: 1-13087

BOSTON PROPERTIES, INC.

(Exact name of Registrant as specified in its charter)

Delaware	04-2473675
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
Prudential Center, 800 Boylston Street, Suite 1900 Boston, Massachusetts	02199-8103
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (617) 236-3300

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of exchange on which registered
Common Stock, par value $.01 per share Preferred Stock Purchase Rights	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  x             Accelerated filer  ¨            Non-accelerated filer  ¨            Smaller reporting company  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

As of June 30, 2013, the aggregate market value of the 151,108,041 shares of common stock held by non-affiliates of the Registrant was $15,937,365,185 based upon the last reported sale price of $105.47 per share on the New York Stock Exchange on June 28, 2013. (For this computation, the Registrant has excluded the market value of all shares of Common Stock reported as beneficially owned by executive officers and directors of the Registrant; such exclusion shall not be deemed to constitute an admission that any such person is an affiliate of the Registrant.)

As of February 21, 2014, there were 153,006,302 shares of Common Stock outstanding.

Certain information contained in the Registrant’s Proxy Statement relating to its Annual Meeting of Stockholders to be held May 20, 2014 is incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III. The Registrant intends to file such Proxy Statement with the Securities and Exchange Commission not later than 120 days after the end of its fiscal year ended December 31, 2013.

TABLE OF CONTENTS 

ITEM NO.	DESCRIPTION	PAGE NO.
PART I			1
1	BUSINESS		1
1A.	RISK FACTORS		19
1B.	UNRESOLVED STAFF COMMENTS		39
2.	PROPERTIES		40
3.	LEGAL PROCEEDINGS		46
4.	MINE SAFETY DISCLOSURES		46
PART II			47
5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES		47
6.	SELECTED FINANCIAL DATA		49
7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS		51
7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK		110
8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA		112
9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE		166
9A.	CONTROLS AND PROCEDURES		166
9B.	OTHER INFORMATION		166
PART III			167
10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE		167
11.	EXECUTIVE COMPENSATION		167
12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS		167
13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE		168
14.	PRINCIPAL ACCOUNTANT FEES AND SERVICES		168
PART IV			169
15.	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES		169

PART I

Item 1. Business

General

As used herein, the terms “we,” “us,” “our” and the “Company” refer to Boston Properties, Inc., a Delaware corporation organized in 1997, individually or together with its subsidiaries, including Boston Properties Limited Partnership, a Delaware limited partnership, and our predecessors. We are a fully integrated, self-administered and self-managed real estate investment trust, or “REIT,” and one of the largest owners and developers of office properties in the United States.

Our properties have been concentrated in five markets—Boston, New York, Princeton, San Francisco and Washington, DC. Beginning in fiscal 2014, Princeton will be reflected as the suburban component of the New York region. We conduct substantially all of our business through our subsidiary, Boston Properties Limited Partnership. At December 31, 2013, we owned or had interests in 175 properties, totaling approximately 44.4 million net rentable square feet, including nine properties under construction totaling approximately 2.9 million net rentable square feet. In addition, we had structured parking for approximately 45,234 vehicles containing approximately 15.4 million square feet. Our properties consisted of:

• 167 office properties, including 128 Class A office properties (including eight properties under construction) and 39 Office/Technical properties;

• one hotel;

• four retail properties; and

• three residential properties (one of which is under construction).

We own or control undeveloped land totaling approximately 503.6 acres, which could support approximately 12.4 million square feet of additional development.

We consider Class A office properties to be centrally-located buildings that are professionally managed and maintained, attract high-quality tenants and command upper-tier rental rates, and that are modern structures or have been modernized to compete with newer buildings. We consider Office/Technical properties to be properties that support office, research and development, laboratory and other technical uses. Our definitions of Class A office and Office/Technical properties may be different than those used by other companies.

We are a full-service real estate company, with substantial in-house expertise and resources in acquisitions, development, financing, capital markets, construction management, property management, marketing, leasing, accounting, tax and legal services. As of December 31, 2013, we had approximately 760 employees. Our thirty-four senior officers have an average of twenty-nine years experience in the real estate industry, including an average of nineteen years of experience with us. Our principal executive office and Boston regional office are located at The Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199 and our telephone number is (617) 236-3300. In addition, we have regional offices at 599 Lexington Avenue, New York, New York 10022; Four Embarcadero Center, San Francisco, California 94111; and 2200 Pennsylvania Avenue NW, Washington, DC 20037.

Our Web site is located at http://www.bostonproperties.com. On our Web site, you can obtain a free copy of our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission, or the SEC. You may also obtain our reports by accessing the EDGAR database at the SEC’s website at http://www.sec.gov, or we will furnish an electronic or paper copy of these reports free of charge upon written request to: Investor Relations, Boston Properties, Inc., The Prudential Center,

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800 Boylston Street, Suite 1900, Boston, Massachusetts 02199. The name “Boston Properties” and our logo (consisting of a stylized “b”) are registered service marks of Boston Properties Limited Partnership.

Boston Properties Limited Partnership

Boston Properties Limited Partnership, or BPLP or our Operating Partnership, is a Delaware limited partnership, and the entity through which we conduct substantially all of our business and own, either directly or through subsidiaries, substantially all of our assets. We are the sole general partner and, as of February 21, 2014, the owner of approximately 89.5% of the economic interests in BPLP. Economic interest was calculated as the number of common partnership units of BPLP owned by the Company as a percentage of the sum of (1) the actual aggregate number of outstanding common partnership units of BPLP, (2) the number of common partnership units issuable upon conversion of outstanding preferred partnership units of BPLP and (3) the number of common units issuable upon conversion of all outstanding long term incentive plan units of BPLP, or LTIP Units, other than LTIP Units issued in the form of Outperformance Awards (“OPP Awards”) and Multi-Year Long-Term Incentive Plan Awards (“MYLTIP Awards”), assuming all conditions have been met for the conversion of the LTIP Units. Refer to Note 20 to the Consolidated Financial Statements. An LTIP Unit is generally the economic equivalent of a share of our restricted common stock, although LTIP Units issued in the form of OPP Awards or MYLTIP Awards are only entitled to receive one-tenth (1/10^th) of the regular quarterly distributions (and no special distributions) prior to being earned. Our general and limited partnership interests in BPLP entitle us to share in cash distributions from, and in the profits and losses of, BPLP in proportion to our percentage interest and entitle us to vote on all matters requiring a vote of the limited partners. The other limited partners of BPLP are persons who contributed their direct or indirect interests in properties to BPLP in exchange for common units or preferred units of limited partnership interest in BPLP or recipients of LTIP Units pursuant to our Stock Option and Incentive Plan. Under the limited partnership agreement of BPLP, unitholders may present their common units of BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of the units that may restrict such right for a period of time, generally one year from issuance). Upon presentation of a unit for redemption, BPLP must redeem the unit for cash equal to the then value of a share of our common stock. In lieu of cash redemption by BPLP, however, we may elect to acquire any common units so tendered by issuing shares of our common stock in exchange for the common units. If we so elect, our common stock will be exchanged for common units on a one-for-one basis. This one-for-one exchange ratio is subject to specified adjustments to prevent dilution. We generally expect that we will elect to issue our common stock in connection with each such presentation for redemption rather than having BPLP pay cash. With each such exchange or redemption, our percentage ownership in BPLP will increase. In addition, whenever we issue shares of our common stock other than to acquire common units of BPLP, we must contribute any net proceeds we receive to BPLP and BPLP must issue to us an equivalent number of common units of BPLP. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT.

Preferred units of BPLP have the rights, preferences and other privileges as are set forth in an amendment to the limited partnership agreement of BPLP. As of December 31, 2013 and February 21, 2014, BPLP had three series of Preferred Units outstanding consisting of 666,116 Series Two Preferred Units, 360,126 Series Four Preferred Units and 80,000 Series B Preferred Units. The Series Two Preferred Units have a liquidation preference of $50.00 per unit (or an aggregate of approximately $33.3 million at December 31, 2013 and February 21, 2014). The Series Two Preferred Units are convertible, at the holder’s election, into common units at a conversion price of $38.10 per common unit (equivalent to a ratio of 1.312336 common units per Series Two Preferred Unit). Distributions on the Series Two Preferred Units are payable quarterly and, unless the greater rate described in the next sentence applies, accrue at 6.0% per annum. If distributions on the number of common units of limited partnership interest, or OP Units, into which the Series Two Preferred Units are convertible are greater than distributions calculated using the rate described in the preceding sentence for the applicable quarterly period, then the greater distributions are payable instead. The holders of Series Two Preferred Units have the right to require our Operating Partnership to redeem their units for cash at the redemption price of $50.00 per unit on May 12, 2014. The holders also had the right to have their Series Two Preferred Units redeemed for cash as of May 12, 2009, May 12, 2010, May 12, 2011, May 14, 2012 and May 14, 2013, although no holder exercised such

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right. In May 2014, our Operating Partnership also has the right, subject to certain conditions, to call for redemption all of the outstanding Series Two Preferred Units for cash or to convert into OP Units any Series Two Preferred Units that have not been previously redeemed. In the event that our Operating Partnership calls the Series Two Preferred Units for redemption, the holders shall have the right to convert the Series Two Preferred Units to OP Units. Due to the holders’ redemption option existing outside our control, the Series Two Preferred Units are presented outside of permanent equity in our Consolidated Balance Sheets.

The Series Four Preferred Units have a liquidation preference of $50.00 per unit (or an aggregate of approximately $18.0 million at December 31, 2013 and February 21, 2014). The Series Four Preferred Units, which bear a preferred distribution equal to 2.00% per annum on a liquidation preference of $50.00 per unit, are not convertible into or exchangeable for any common equity of BPLP or us. In order to secure the performance of certain obligations by the holders, such Series Four Preferred Units are subject to forfeiture pursuant to the terms of a pledge agreement. The holders of Series Four Preferred Units have the right, at certain times and subject to certain conditions set forth in the Certificate of Designations establishing the rights, limitations and preferences of the Series Four Preferred Units, to require our Operating Partnership to redeem all of their units for cash at the redemption price of $50.00 per unit. Our Operating Partnership also has the right, at certain times and subject to certain conditions, to redeem all of the Series Four Preferred Units for cash at the redemption price of $50.00 per unit. The Series Four Preferred Units that are subject to the security interest under the pledge agreement may not be redeemed until and unless such security interest is released. Due to the holders’ redemption option existing outside our control, the Series Four Preferred Units are presented outside of permanent equity in our Consolidated Balance Sheets.

The Series B Preferred Units have a liquidation preference of $2,500.00 per share (or an aggregate of approximately $193.6 million at December 31, 2013 and February 21, 2014, after deducting the underwriting discount and transaction expenses). The Series B Preferred Units were issued by our Operating Partnership on March 27, 2013 in connection with our issuance of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of 5.25% Series B Cumulative Redeemable Preferred Stock (the “Series B Preferred Stock”). We contributed the net proceeds from the offering to our Operating Partnership in exchange for Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock. We will pay cumulative cash dividends on the Series B Preferred Stock at a rate of 5.25% per annum of the $2,500.00 liquidation preference per share. We may not redeem the Series B Preferred Stock prior to March 27, 2018, except in certain circumstances relating to the preservation of our REIT status. On or after March 27, 2018, at our option, we may redeem the Series B Preferred Stock for a cash redemption price of $2,500.00 per share, plus all accrued and unpaid dividends. The Series B Preferred Stock is not redeemable by the holders, has no maturity date and is not convertible into any other security of the Company or its affiliates.

Transactions During 2013

Acquisitions

On February 6, 2013, we completed the acquisition of 535 Mission Street, a development site, in San Francisco, California for an aggregate purchase price of approximately $71.0 million in cash, including work completed and materials purchased to date. When completed, 535 Mission Street will consist of a 27-story, Class A office tower with approximately 307,000 net rentable square feet of office and retail space. The property is currently under development.

On March 26, 2013, a consolidated joint venture in which we have a 95% interest completed the acquisition of a land parcel in San Francisco, California that will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The purchase price for the land was approximately $192.0 million. On February 7, 2013, the partner in the joint venture issued a notice that it was electing under the joint venture agreement to reduce its nominal ownership interest in the venture from 50% to 5%. On February 26, 2013, we issued a notice to the partner electing to proceed with the venture on that basis. As a result, we have a 95% nominal interest in

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and are consolidating the joint venture. The initial phase of the development consisting of building the project to grade is currently under development.

On March 29, 2013, we completed the acquisition of a parcel of land located in Reston, Virginia for a purchase price of approximately $27.0 million. The land parcel is commercially zoned for 250,000 square feet of office space.

On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from our Value-Added Fund (the “Value-Added Fund”) for an aggregate net purchase price of approximately $233.1 million. Mountain View Research Park is a 16-building complex of Office/Technical properties aggregating approximately 604,000 net rentable square feet. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and account for them on a consolidated basis.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties. 767 Fifth Avenue (the General Motors Building) is a Class A office property totaling approximately 1.8 million net rentable square feet. In connection with the transfer, we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that, effective as of May 31, 2013, we account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial statements instead of under the equity method of accounting.

Dispositions

On February 20, 2013, the foreclosure sale of our Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million.

On June 28, 2013, we completed the sale of our 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. Net cash proceeds totaled approximately $39.3 million. 303 Almaden Boulevard is a Class A office property totaling approximately 158,000 net rentable square feet. Because we entered into the related purchase and sale agreement on March 28, 2013 and the carrying value of the property exceeded its net sale price, we recognized an impairment loss totaling approximately $3.2 million during the three months ended March 31, 2013. As a result, there was no loss on sale of real estate recognized during the year ended December 31, 2013. The sale of this asset caused us to reevaluate our strategy for development of our adjacent Almaden land parcel, which can accommodate an approximately 840,000 square feet office complex. Based on a shorter than expected hold period, we reduced the carrying value of the land parcel to its estimated fair market value and recognized an impairment loss of approximately $8.3 million during the three months ended March 31, 2013.

On August 22, 2013, we completed the sale of our 1301 New York Avenue property located in Washington, DC for a net contract sale price of approximately $121.7 million. After adjusting for outstanding lease and other transaction costs assumed by the buyer, the gross sale price was approximately $135.0 million. Net cash proceeds totaled approximately $121.5 million, resulting in a gain on sale of approximately $86.4 million. 1301 New York Avenue is a Class A office property totaling approximately 201,000 net rentable square feet.

On October 9, 2013, we completed the sale of a 45% ownership interest in our Times Square Tower property for a gross sale price of $684.0 million in cash. Net cash proceeds totaled approximately $673.1 million,

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after the payment of transaction costs. In connection with the sale, we formed a joint venture with the buyer and will provide customary property management and leasing services to the joint venture. Times Square Tower is an approximately 1,246,000 net rentable square foot Class A office tower located in New York City. The transaction did not qualify as a sale of real estate for financial reporting purposes because we continue to control the joint venture and will therefore continue to account for the entity on a consolidated basis in our financial statements. We have accounted for the transaction as an equity transaction and have recognized noncontrolling interest in our consolidated balance sheets totaling approximately $243.5 million, which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction. The difference between the net cash proceeds received and the noncontrolling interest recognized, which difference totals approximately $429.6 million, has not been reflected as a gain on sale of real estate in our consolidated statements of operations and has instead been reflected as an increase to additional paid-in capital in our consolidated balance sheets.

On December 20, 2013, we completed the sale of our 10 & 20 Burlington Mall Road property located in Burlington, Massachusetts for a sale price of approximately $30.0 million. Net cash proceeds totaled approximately $29.4 million, resulting in a gain on sale of approximately $20.5 million. 10 & 20 Burlington Mall Road consists of two Class A office properties aggregating approximately 152,000 net rentable square feet.

On December 20, 2013, we completed the sale of our One Preserve Parkway property located in Rockville, Maryland for a sale price of approximately $61.3 million. Net cash proceeds totaled approximately $59.9 million, resulting in a gain on sale of approximately $5.9 million. One Preserve Parkway is a Class A office property totaling approximately 184,000 net rentable square feet.

Developments

As of December 31, 2013, we had nine properties under construction comprised of eight office properties and one residential property, which aggregate approximately 2.9 million square feet. We estimate the total investment to complete these projects, in the aggregate, is approximately $2.5 billion of which we had already invested approximately $1.8 billion as of December 31, 2013. The investment through December 31, 2013 and estimated total investment for our properties under construction as of December 31, 2013 are detailed below (in thousands):

Construction Properties	Estimated Stabilization Date	Location	Investment to Date(1)		Estimated  Total Investment(1)
Office
Annapolis Junction Building Seven (50% ownership)	First Quarter, 2015	Annapolis, MD	$	11,580	$	17,500
680 Folsom Street	Third Quarter, 2015	San Francisco, CA		279,923		340,000
250 West 55th Street	Fourth Quarter, 2015	New York, NY		840,317		1,050,000
804 Carnegie Center	First Quarter, 2016	Princeton, NJ		1,970		40,410
535 Mission Street	Third Quarter, 2016	San Francisco, CA		113,275		215,000
601 Massachusetts Avenue	Fourth Quarter, 2017	Washington, DC		155,310		360,760
Transbay Tower (95% ownership)(2)	N/A	San Francisco, CA		244,082		340,000
Total Office Properties under Construction			$	1,646,457	$	2,363,670
Residential
The Avant at Reston Town Center (359 units)	Fourth Quarter, 2015	Reston, VA	$	109,194	$	137,250
Total Properties under Construction			$	1,755,651	$	2,500,920

(1) Represents our share. Includes net revenue during lease up period and approximately $53.9 million of construction cost and leasing commission accruals.

(2) The Estimated Total Investment represents only the cost to build to grade.

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On March 22, 2013, we completed and fully placed in-service Two Patriots Park, a Class A office redevelopment project with approximately 256,000 net rentable square feet located in Reston, Virginia. As of December 31, 2013, this property was 100% leased.

On April 1, 2013, we commenced construction on the initial phase of our Transbay Tower development project in San Francisco, California, which consists of building the project to grade.

On April 25, 2013, we commenced construction of our 601 Massachusetts Avenue, a Class A office development project totaling approximately 478,000 net rentable square feet located in Washington, DC.

On June 14, 2013, we completed and fully placed in-service Seventeen Cambridge Center, a Class A office project with approximately 195,000 net rentable square feet located in Cambridge, Massachusetts. As of December 31, 2013, this property was 100% leased.

On July 1, 2013, we completed and fully placed in-service our Cambridge Center Connector, a Class A office project with approximately 43,000 net rentable square feet located in Cambridge, Massachusetts. As of December 31, 2013, this property was 100% leased.

On October 29, 2013, we entered into a lease agreement as landlord with a third-party tenant for a build-to-suit project with approximately 130,000 net rentable square feet of Class A office space located in Princeton, New Jersey.

As of December 31, 2013, we have placed in-service approximately 63% of The Avant at Reston Town Center development project comprised of 359 apartment units and retail space aggregating approximately 355,000 square feet located in Reston, Virginia. The retail space totaling approximately 26,000 net rentable square feet is 100% leased and the residential units are approximately 17% leased as of February 21, 2014. On February 10, 2014, this project was fully placed in-service.

As of December 31, 2013, we have placed in-service approximately 6% of our 250 West 55th Street development project. When completed, this project will consist of approximately 989,000 net rentable square feet of Class A office space and is approximately 61% leased as of February 21, 2014.

As of December 31, 2013, we have placed in-service approximately 1% of our 680 Folsom Street development project. When completed, this project will consist of approximately 524,509 net rentable square feet of Class A office space and is approximately 96% leased as of February 21, 2014.

Secured Debt Transactions

On February 5, 2013, we used available cash to repay the mortgage loan collateralized by our Kingstowne One property located in Alexandria, Virginia totaling approximately $17.0 million. The mortgage loan bore interest at a fixed rate of 5.96% per annum and was scheduled to mature on May 5, 2013. There was no prepayment penalty.

On February 20, 2013, the foreclosure sale of our Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million.

On April 1, 2013, we used available cash to repay the mortgage loan collateralized by our 140 Kendrick Street property located in Needham, Massachusetts totaling approximately $47.6 million. The mortgage loan bore interest at a fixed rate of 7.51% per annum and was scheduled to mature on July 1, 2013. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.3 million

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related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

On May 31, 2013, in conjunction with the consolidation of our 767 Venture, LLC joint venture (the entity that owns 767 Fifth Avenue (the General Motors Building)), we recorded mortgage loans collateralized by the property aggregating $1.3 billion and mezzanine loans aggregating $306.0 million. The mortgage loans require interest-only payments at a weighted-average fixed interest rate of 5.95% per annum and mature on October 7, 2017. The mezzanine loans require interest-only payments at a weighted-average fixed interest rate of 6.02% per annum and mature on October 7, 2017. The mortgage loans and mezzanine loans were recorded at their fair values aggregating approximately $1.5 billion and $311.7 million, respectively, using weighted-average effective interest rates of approximately 2.44% and 5.53% per annum, respectively. In addition, in conjunction with the consolidation, we recorded loans payable to the joint venture’s partners totaling $450.0 million and related accrued interest payable totaling approximately $175.8 million. The member loans bear interest at a fixed rate of 11.0% per annum and mature on June 9, 2017. We have eliminated in consolidation our member loan totaling $270.0 million and our share of the related accrued interest payable of approximately $114.5 million at December 31, 2013. The remaining notes payable to the outside joint venture partners and related accrued interest payable totaling $180.0 million and approximately $76.4 million as of December 31, 2013 have been reflected as Outside Members’ Notes Payable and within Accrued Interest Payable, respectively, on our Consolidated Balance Sheets. The related interest expense from the Outside Members’ Notes Payable totaling approximately $16.0 million for the period from May 31, 2013 through December 31, 2013 is fully allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations.

Unsecured Senior Notes

On April 11, 2013, our Operating Partnership completed a public offering of $500.0 million in aggregate principal amount of its 3.125% senior unsecured notes due 2023. The notes were priced at 99.379% of the principal amount to yield an effective rate (including financing fees) of 3.279% to maturity. The notes will mature on September 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $492.5 million after deducting underwriting discounts and transaction expenses.

On June 27, 2013, our Operating Partnership completed a public offering of $700.0 million in aggregate principal amount of its 3.800% senior unsecured notes due 2024. The notes were priced at 99.694% of the principal amount to yield an effective rate (including financing fees) of 3.916% to maturity. The notes will mature on February 1, 2024, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $691.9 million after deducting the underwriting discount and transaction expenses.

Unsecured Exchangeable Senior Notes

On April 15, 2013, we announced that holders of our Operating Partnership’s 3.75% Exchangeable Senior Notes due 2036 (the “Notes”) had the right to surrender their Notes for purchase by our Operating Partnership (the “Put Right”) on May 18, 2013. On April 15, 2013, we also announced that our Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on May 18, 2013 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the notice of redemption, holders of the Notes had the right to exchange their Notes on or prior to May 16, 2013. Notes with respect to which the Put Right was not exercised and that were not surrendered for exchange on or prior to May 16, 2013, were redeemed by our Operating Partnership at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon to, but excluding, the Redemption Date. Based on final information provided to our Operating Partnership by the trustee for the Notes, no Notes were validly tendered and accepted for purchase in the Put Right. Pursuant to the notice of redemption, an aggregate principal amount of $990,000 of the Notes was redeemed on May 18, 2013. The remaining aggregate principal amount of $449,010,000 of the Notes was surrendered for exchange and, in addition to the repayment of the principal in cash, we issued an aggregate of

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419,116 shares of our common stock in exchange for the Notes. We recognized a loss on early extinguishment of debt totaling approximately $0.1 million consisting of transaction costs.

Unsecured Line of Credit

On July 26, 2013, our Operating Partnership amended and restated the revolving credit agreement governing its Unsecured Line of Credit, which, among other things, (1) increased the total commitment from $750.0 million to $1.0 billion, (2) extended the maturity date from June 24, 2014 to July 26, 2018 and (3) reduced the per annum variable interest rates and other fees. Our Operating Partnership may increase the total commitment to $1.5 billion, subject to syndication of the increase and other conditions. At our Operating Partnership’s option, loans outstanding under the Unsecured Line of Credit will bear interest at a rate per annum equal to (1), in the case of loans denominated in Dollars, Euro or Sterling, LIBOR or, in the case of loans denominated in Canadian Dollars, CDOR, in each case, plus a margin ranging from 0.925% to 1.70% based on our Operating Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Administrative Agent’s prime rate, (b) the Federal Funds rate plus 0.5% or (c) LIBOR for a one month period plus 1.00%, in each case, plus a margin ranging from 0.0% to 0.70% based on our Operating Partnership’s credit rating. The Unsecured Line of Credit also contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loan advances to our Operating Partnership at a reduced interest rate. In addition, our Operating Partnership is also obligated to pay (1) in quarterly installments a facility fee on the total commitment at a rate per annum ranging from 0.125% to 0.35% based on our Operating Partnership’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit equal to the LIBOR margin. Based on our Operating Partnership’s current credit rating, the LIBOR and CDOR margin is 1.00%, the alternate base rate margin is 0.0% and the facility fee is 0.15%. At December 31, 2013, there were no amounts outstanding on the Unsecured Line of Credit.

Equity Transactions

On March 27, 2013, we completed an underwritten public offering of 80,000 shares (8,000,000 depositary shares, each representing 1/100th of a share) of our newly designated 5.25% Series B Cumulative Redeemable Preferred Stock, at a price of $2,500.00 per share ($25.00 per depositary share). The net proceeds from this offering were approximately $194 million, after deducting the underwriting discount and transaction expenses. We contributed the net proceeds from the offering to our Operating Partnership in exchange for 80,000 Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock.

On August 29, 2013, our Operating Partnership redeemed approximately 861,400 Series Four Preferred Units for cash at the redemption price of $50.00 per unit plus accrued and unpaid distributions through the redemption date.

During the year ended December 31, 2013, we acquired an aggregate of 929,441 common units of limited partnership interest, including 26,402 common units issued upon the conversion of LTIP units and 432,914 issued upon the conversion of Series Two preferred units, presented by the holders for redemption, in exchange for an equal number of shares of common stock.

Special Dividend

On December 2, 2013, we announced that our Board of Directors declared a special cash dividend of $2.25 per common share payable on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013. The decision to declare a special dividend was primarily a result of the sale of a 45% interest in our Times Square Tower property in October 2013. The Board of Directors did not make any change in our policy with respect to regular quarterly dividends. Holders of common units of limited partnership interest in our Operating Partnership, as of the close of business on December 31, 2013, received the same distribution on January 29, 2014. Holders of Series Two Preferred Units of limited partnership interest will participate in the special cash dividend (separately from their regular February 2014 distribution) on an as-converted basis in

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connection with their regular May 2014 distribution payment as provided in our Operating Partnership’s partnership agreement.

Investments in Unconsolidated Joint Ventures

On February 28, 2013, a joint venture in which we have a 50% interest completed and fully placed in-service Annapolis Junction Building Six, a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland. As of December 31, 2013, this property was approximately 49% leased.

On March 31, 2013, a joint venture in which we have a 30% interest completed and fully placed in-service 500 North Capitol Street, NW, a Class A office redevelopment project with approximately 231,000 net rentable square feet located in Washington, DC. As of December 31, 2013, this property was approximately 85% leased.

On April 4, 2013, a joint venture in which we have a 50% interest obtained construction financing collateralized by its Annapolis Junction Building Seven development project located in Annapolis, Maryland totaling $22.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on April 4, 2016, with two, one-year extension options, subject to certain conditions.

On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from our Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. In conjunction with the acquisition, the Value-Added Fund repaid the mortgage loans collateralized by the Mountain View Research Park and Mountain View Technology Park properties totaling approximately $90.0 million and $20.0 million, respectively, as well as the outstanding loans payable to our Operating Partnership totaling approximately $8.6 million and $3.7 million, respectively. The Mountain View Research Park and Mountain View Technology Park mortgage loans bore interest at variable rates equal to LIBOR plus 2.00% per annum and LIBOR plus 2.50% per annum, respectively and were scheduled to mature on May 31, 2014 and November 22, 2014, respectively. The joint venture recognized a loss on early extinguishment of debt totaling approximately $0.4 million, of which our share was approximately $0.2 million, consisting of the write-off of unamortized deferred financing costs. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and are accounting for them on a consolidated basis. We had previously recognized an impairment loss on our investment in the unconsolidated joint venture. As a result, we recognized a gain on our investment of approximately $26.5 million, which is included within gains on consolidation of joint ventures in our consolidated statements of operations.

On May 30, 2013, a joint venture in which we have a 60% interest completed the sale of its 125 West 55th Street property located in New York City for a sale price of $470.0 million, including the assumption by the buyer of the mortgage loan collateralized by the property totaling approximately $198.6 million. The mortgage loan bore interest at a fixed rate of 6.09% per annum and was scheduled to mature on March 10, 2020. Net cash proceeds totaled approximately $253.7 million, of which our share was approximately $152.2 million, after the payment of transaction costs. 125 West 55th Street is a Class A office property totaling approximately 588,000 net rentable square feet. We had previously recognized an impairment loss on our investment in the unconsolidated joint venture. As a result, we recognized a gain on sale of real estate totaling approximately $43.2 million, which is included within income from unconsolidated joint ventures in our consolidated statements of operations.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our

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financial statements instead of under the equity method of accounting. Upon consolidation, we recognized a non-cash gain on our investment of approximately $359.5 million, which is included within gains on consolidation of joint ventures in our consolidated statements of operations.

On May 31, 2013, a joint venture in which we have a 30% interest refinanced its construction loan collateralized by 500 North Capitol Street, NW located in Washington, DC. The construction loan totaling approximately $90.6 million bore interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on October 14, 2014. The joint venture recognized a loss on early extinguishment of debt totaling approximately $1.0 million, of which our share was approximately $0.3 million, consisting of the write-off of unamortized deferred financing costs. The new mortgage loan totaling $105.0 million requires interest only payments at a fixed interest rate of 4.15% per annum and matures on June 6, 2023.

On June 5, 2013, a joint venture in which we have a 60% interest refinanced its mortgage loans collateralized by 540 Madison Avenue located in New York City. The mortgage loans aggregating approximately $118.0 million bore interest at a weighted-average fixed rate of 5.20% per annum and were scheduled to mature on July 11, 2013. The joint venture recognized a loss on early extinguishment of debt totaling approximately $0.3 million, of which our share was approximately $0.2 million, related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting. The new mortgage loan totaling $120.0 million requires interest only payments at a variable rate equal to LIBOR plus 1.50% per annum and matures on June 5, 2018.

On July 19, 2013, a joint venture in which we have a 50% interest completed the sale of its Eighth Avenue and 46th Street project located in New York City for an imputed sale price of $45.0 million. The Eighth Avenue and 46th Street project is comprised of an assemblage of land parcels and air-rights. Net cash proceeds to us totaled approximately $21.8 million, after the payment of transaction costs. The joint venture had previously recognized an impairment loss on the property. As a result, the joint venture recognized a gain on sale of real estate totaling approximately $12.6 million, of which our share was approximately $11.3 million. Our share of the gain on sale of real estate is reflective of our share of the net proceeds from the sale price and is included within income from unconsolidated joint ventures in our consolidated statements of operations.

On September 26, 2013, a joint venture in which we have a 50% interest entered into a lease agreement for its Annapolis Junction Building Seven development project. Annapolis Junction Building Seven when completed will consist of a Class A office property with approximately 125,000 net rentable square feet located in Annapolis, Maryland.

On October 29, 2013, a joint venture in which we have a 50% interest exercised an option to extend the maturity date to November 17, 2014 of the construction financing collateralized by its Annapolis Junction Building Six property. The construction financing totaling approximately $14.0 million bears interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on November 17, 2013. Annapolis Junction Building Six is a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

Stock Option and Incentive Plan

On January 28, 2013, our Compensation Committee approved a new equity-based, multi-year, long-term incentive program (the “2013 MYLTIP”) in lieu of an Outperformance Plan as a performance-based component of our overall compensation program. Under the Financial Accounting Standards Board’s Accounting Standards Codification (“ASC”) 718 “Compensation—Stock Compensation,” the 2013 MYLTIP has an aggregate value of approximately $8.1 million, which amount will generally be amortized into earnings over the five-year plan period under the graded vesting method.

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On February 1, 2013, we issued 35,087 shares of restricted common stock and our Operating Partnership issued 153,006 LTIP units and 201,373 non-qualified stock options under the 2012 Plan to certain of our employees.

Succession Planning

On March 11, 2013, we announced that Owen D. Thomas would succeed Mortimer B. Zuckerman as our Chief Executive Officer, effective April 2, 2013. Mr. Zuckerman will continue to serve as Executive Chairman for a transition period and thereafter is expected to continue to serve as the Non-Executive Chairman of the Board. In connection with succession planning, Mr. Zuckerman entered into a Transition Benefits Agreement with us. If Mr. Zuckerman remains employed by us through July 1, 2014, he will be entitled to receive on January 1, 2015 a lump sum cash payment of $6.7 million and an equity award with a targeted value of approximately $11.1 million. The cash payment and equity award vest one-third on each of March 10, 2013, October 1, 2013 and July 1, 2014, subject to acceleration in certain circumstances. As a result, we recognized approximately $13.8 million of compensation expense during the year ended December 31, 2013. We expect to recognize the remaining approximately $4.0 million of compensation expense over the remaining vesting period and, accordingly, expect to expense approximately $2.0 million in each of the 1st and 2nd quarters of 2014. In addition, the agreement provides that if Mr. Zuckerman terminates his employment with us for any reason, voluntarily or involuntarily, he will become fully vested in any outstanding equity awards with time-based vesting. As a result, during the year ended December 31, 2013, we accelerated the remaining approximately $12.9 million of stock-based compensation expense associated with Mr. Zuckerman’s unvested long-term equity awards.

On April 2, 2013, we issued 24,231 LTIP units, 38,926 2013 MYLTIP Units and 50,847 non-qualified stock options under the 2012 Plan to Owen D. Thomas, our new Chief Executive Officer, pursuant to his employment agreement.

Business and Growth Strategies

Business Strategies

Our primary business objective is to maximize return on investment so as to provide our investors with the greatest possible total return in all points of the economic cycle. Our strategies to achieve this objective are:

• to target a few carefully selected geographic markets, including Boston, New York, San Francisco and Washington, DC, and to be one of the leading, if not the leading, owners, developers and managers in each of those markets with a full-service office in each market providing property management, leasing, development, construction and legal expertise. We select markets and submarkets with a diverse economic base and a deep pool of prospective tenants in various industries and where tenants have demonstrated a preference for high-quality office buildings and other facilities;

• to emphasize markets and submarkets within those markets where the lack of available sites and the difficulty of receiving the necessary approvals for development and the necessary financing constitute high barriers to the creation of new supply, and where skill, financial strength and diligence are required to successfully develop, finance and manage high-quality office, research and development space, as well as selected retail and residential space;

• to take on complex, technically challenging development projects, leveraging the skills of our management team to successfully develop, acquire or reposition properties that other organizations may not have the capacity or resources to pursue;

• to own and develop high-quality real estate designed to meet the demands of today’s tenants who require sophisticated telecommunications and related infrastructure, support services and amenities, and to manage those facilities so as to become the landlord of choice for both existing and prospective clients;

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• to opportunistically acquire assets which increase our penetration in the markets in which we have chosen to concentrate, as well as potential new markets, which exhibit an opportunity to improve or preserve returns through repositioning (through a combination of capital improvements and shift in marketing strategy), changes in management focus and leasing;

• to explore joint venture opportunities primarily with existing property owners located in desirable locations, who seek to benefit from the depth of development and management expertise we are able to provide and our access to capital, and/or to explore joint venture opportunities with strategic institutional partners, leveraging our skills as owners, operators and developers of Class A office space and mixed-use complexes;

• to pursue on a selective basis the sale of properties or interests therein, including core properties, to either (1) take advantage of the demand for our premier properties and realize the value we have created or (2) pare from our portfolio of properties that we believe have slower future growth potential;

• to seek third-party development contracts, which can be a significant source of revenue and enable us to retain and utilize our existing development and construction management staff, especially when our internal development is less active or when new development is less-warranted due to market conditions; and

• to enhance our capital structure through our access to a variety of sources of capital and proactively manage our debt expirations.

Growth Strategies

External Growth Strategies

We believe that our development experience and our organizational depth position us to continue to selectively develop a range of property types, including high-rise urban developments, mixed-use developments (including residential), low-rise suburban office properties and research and laboratory space, within budget and on schedule. We believe we are also well positioned to achieve external growth through acquisitions. Other factors that contribute to our competitive position include:

• our control of sites (including sites under contract or option to acquire) in our markets that could support approximately 12.4 million additional square feet of new office, retail, and residential development;

• our reputation gained through 44 years of successful operations and the stability and strength of our existing portfolio of properties;

• our relationships with leading national corporations, universities and public institutions seeking new facilities and development services;

• our relationships with nationally recognized financial institutions that provide capital to the real estate industry;

• our track record and reputation for executing acquisitions efficiently provide comfort to domestic and foreign institutions, private investors and corporations who seek to sell commercial real estate in our market areas;

• our ability to act quickly on due diligence and financing; and

• our relationships with institutional buyers and sellers of high-quality real estate assets.

Opportunities to execute our external growth strategy fall into three categories:

• Development in selected submarkets. We believe the additional development of well-positioned office buildings and mixed use complexes could be justified in many of our submarkets. We believe in acquiring land after taking into consideration timing factors relating to economic cycles and in response to market conditions that allow for its development at the appropriate time. While we purposely

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concentrate in markets with high barriers-to-entry, we have demonstrated throughout our 44-year history, an ability to make carefully timed land acquisitions in submarkets where we can become one of the market leaders in establishing rent and other business terms. We believe that there are opportunities at key locations in our existing and other markets for a well-capitalized developer to acquire land with development potential.

In the past, we have been particularly successful at acquiring sites or options to purchase sites that need governmental approvals for development. Because of our development expertise, knowledge of the governmental approval process and reputation for quality development with local government regulatory bodies, we generally have been able to secure the permits necessary to allow development and to profit from the resulting increase in land value. We seek complex projects where we can add value through the efforts of our experienced and skilled management team leading to attractive returns on investment.

Our strong regional relationships and recognized development expertise have enabled us to capitalize on unique build-to-suit opportunities. We intend to seek and expect to continue to be presented with such opportunities in the near term allowing us to earn relatively significant returns on these development opportunities through multiple business cycles.

• Acquisition of assets and portfolios of assets from institutions or individuals. We believe that due to our size, management strength and reputation, we are well positioned to acquire portfolios of assets or individual properties from institutions or individuals if valuations meet our criteria. In addition, we believe that our market knowledge and our liquidity and access to capital may provide us with a competitive advantage when pursuing acquisitions. There may be enhanced opportunities to purchase assets with near-term financing maturities or possibly provide debt on assets at enhanced yields given the limited availability of traditional sources of debt. Opportunities to acquire properties may also come through the purchase of first mortgage or mezzanine debt. We may also acquire properties for cash, but we are also particularly well-positioned to appeal to sellers wishing to contribute on a tax-deferred basis their ownership of property for equity in a diversified real estate operating company that offers liquidity through access to the public equity markets in addition to a quarterly distribution. Our ability to offer common and preferred units of limited partnership in BPLP to sellers who would otherwise recognize a taxable gain upon a sale of assets or our common stock may facilitate this type of transaction on a tax-efficient basis. In addition, we may consider mergers with and acquisitions of compatible real estate firms.

• Acquisition of underperforming assets and portfolios of assets. We believe that because of our in-depth market knowledge and development experience in each of our markets, our national reputation with brokers, financial institutions and others involved in the real estate market and our access to competitively-priced capital, we are well-positioned to identify and acquire existing, underperforming properties for competitive prices and to add significant additional value to such properties through our effective marketing strategies, repositioning/redevelopment expertise and a responsive property management program. We have developed this strategy and program for our existing portfolio, where we provide high-quality property management services using our own employees in order to encourage tenants to renew, expand and relocate in our properties. We are able to achieve speed and transaction cost efficiency in replacing departing tenants through the use of in-house and third-party vendors’ services for marketing, including calls and presentations to prospective tenants, print advertisements, lease negotiation and construction of tenant improvements. Our tenants benefit from cost efficiencies produced by our experienced work force, which is attentive to preventive maintenance and energy management.

Internal Growth Strategies

We believe that opportunities will exist to increase cash flow from our existing properties because they are of high quality and in desirable locations within markets where, in general, the creation of new supply is limited

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by the lack of available sites and the difficulty of obtaining the necessary approvals for development on vacant land and financing. Our strategy for maximizing the benefits from these opportunities is three-fold: (1) to provide high-quality property management services using our employees in order to encourage tenants to renew, expand and relocate in our properties, (2) to achieve speed and transaction cost efficiency in replacing departing tenants through the use of in-house services for marketing, lease negotiation and construction of tenant improvements and (3) to work with new or existing tenants with space expansion or contraction needs maximizing the cash flow from our assets. We expect to continue our internal growth as a result of our ability to:

• Cultivate existing submarkets and long-term relationships with credit tenants. In choosing locations for our properties, we have paid particular attention to transportation and commuting patterns, physical environment, adjacency to established business centers, proximity to sources of business growth and other local factors.

The average lease term of our in-place leases, including unconsolidated joint ventures, was approximately 6.6 years at December 31, 2013 and we continue to cultivate long-term leasing relationships with a diverse base of high-quality, financially stable tenants. Based on leases in place at December 31, 2013, leases with respect to approximately 6.2% of the total square feet in our portfolio, including unconsolidated joint ventures, will expire in calendar year 2014.

• Directly manage properties to maximize the potential for tenant retention. We provide property management services ourselves, rather than contracting for this service, to maintain awareness of and responsiveness to tenant needs. We and our properties also benefit from cost efficiencies produced by an experienced work force attentive to preventive maintenance and energy management and from our continuing programs to assure that our property management personnel at all levels remain aware of their important role in tenant relations.

• Replace tenants quickly at best available market terms and lowest possible transaction costs. We believe that we are well-positioned to attract new tenants and achieve relatively high rental rates as a result of our well-located, well- designed and well-maintained properties, our reputation for high-quality building services and responsiveness to tenants, and our ability to offer expansion and relocation alternatives within our submarkets.

• Extend terms of existing leases to existing tenants prior to expiration. We have also successfully structured early tenant renewals, which have reduced the cost associated with lease downtime while securing the tenancy of our highest quality credit-worthy tenants on a long-term basis and enhancing relationships.

Policies with Respect to Certain Activities

The discussion below sets forth certain additional information regarding our investment, financing and other policies. These policies have been determined by our Board of Directors and, in general, may be amended or revised from time to time by our Board of Directors.

Investment Policies

Investments in Real Estate or Interests in Real Estate

Our investment objectives are to provide quarterly cash dividends to our securityholders and to achieve long-term capital appreciation through increases in the value of Boston Properties, Inc. We have not established a specific policy regarding the relative priority of these investment objectives.

We expect to continue to pursue our investment objectives primarily through the ownership of our current properties, development projects and other acquired properties. We currently intend to continue to invest primarily in developments of properties and acquisitions of existing improved properties or properties in need of redevelopment, and acquisitions of land that we believe have development potential, primarily in our existing

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markets of Boston, New York, San Francisco and Washington, DC, but also potentially in new markets. Future investment or development activities will not be limited to a specified percentage of our assets. We intend to engage in such future investment or development activities in a manner that is consistent with the maintenance of our status as a REIT for federal income tax purposes. In addition, we may purchase or lease income-producing commercial and other types of properties for long-term investment, expand and improve the real estate presently owned or other properties purchased, or sell such real estate properties, in whole or in part, when circumstances warrant. We do not have a policy that restricts the amount or percentage of assets that will be invested in any specific property, however, our investments may be restricted by our debt covenants.

We may also continue to participate with third parties in property ownership, through joint ventures or other types of co-ownership, including third parties with expertise in mixed-use opportunities. These investments may permit us to own interests in larger assets without unduly restricting diversification and, therefore, add flexibility in structuring our portfolio.

Equity investments may be subject to existing mortgage financing and other indebtedness or such financing or indebtedness as may be incurred in connection with acquiring or refinancing these investments. Debt service on such financing or indebtedness will have a priority over any distributions with respect to our common stock. Investments are also subject to our policy not to be treated as an investment company under the Investment Company Act of 1940, as amended (the “1940 Act”).

Investments in Real Estate Mortgages

While our current portfolio consists primarily of, and our business objectives emphasize, equity investments in commercial real estate, we may, at the discretion of the Board of Directors, invest in mortgages and other types of real estate interests consistent with our qualification as a REIT. Investments in real estate mortgages run the risk that one or more borrowers may default under such mortgages and that the collateral securing such mortgages may not be sufficient to enable us to recoup our full investment. We may invest in participating, convertible or traditional mortgages if we conclude that we may benefit from the cash flow, or any appreciation in value of the property or as an entrance to the fee ownership.

Securities of or Interests in Entities Primarily Engaged in Real Estate Activities

Subject to the percentage of ownership limitations and gross income and asset tests necessary for our REIT qualification, we also may invest in securities of other REITs, other entities engaged in real estate activities or securities of other issuers, including for the purpose of exercising control over such entities.

Dispositions

Our decision to dispose or partially dispose of properties is based upon the periodic review of our portfolio and the determination by the Board of Directors that such action would be in our best interests. Any decision to dispose of a property will be authorized by the Board of Directors or a committee thereof. Some holders of limited partnership interests in BPLP, including Mortimer B. Zuckerman, could incur adverse tax consequences upon the sale of certain of our properties that differ from the tax consequences to us. Consequently, holders of limited partnership interests in BPLP may have different objectives regarding the appropriate pricing and timing of any such sale. Such different tax treatment derives in most cases from the fact that we acquired these properties in exchange for partnership interests in contribution transactions structured to allow the prior owners to defer taxable gain. Generally this deferral continues so long as we do not dispose of the properties in a taxable transaction. Unless a sale by us of these properties is structured as a like-kind exchange under Section 1031 of the Internal Revenue Code or in a manner that otherwise allows deferral to continue, recognition of the deferred tax gain allocable to these prior owners is generally triggered by a sale. Some of our assets are subject to tax protection agreements, which may limit our ability to dispose of the assets or require us to pay damages to the prior owners in the event of a taxable sale.

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Financing Policies

The agreement of limited partnership of BPLP and our certificate of incorporation and bylaws do not limit the amount or percentage of indebtedness that we may incur. We do not have a policy limiting the amount of indebtedness that we may incur. However, our mortgages, credit facilities and unsecured debt securities contain customary restrictions, requirements and other limitations on our ability to incur indebtedness. We have not established any limit on the number or amount of mortgages that may be placed on any single property or on our portfolio as a whole.

Our Board of Directors will consider a number of factors when evaluating our level of indebtedness and when making decisions regarding the incurrence of indebtedness, including the purchase price of properties to be acquired with debt financing, the estimated market value of our properties upon refinancing, the entering into agreements such as interest rate swaps, caps, floors and other interest rate hedging contracts and the ability of particular properties and BPLP as a whole to generate cash flow to cover expected debt service.

Policies with Respect to Other Activities

As the sole general partner of BPLP, we have the authority to issue additional common and preferred units of limited partnership interest of BPLP. We have in the past, and may in the future, issue common or preferred units of limited partnership interest of BPLP to persons who contribute their direct or indirect interests in properties to us in exchange for such common or preferred units of limited partnership interest in BPLP. We have not engaged in trading, underwriting or agency distribution or sale of securities of issuers other than BPLP and we do not intend to do so. At all times, we intend to make investments in such a manner as to maintain our qualification as a REIT, unless because of circumstances or changes in the Internal Revenue Code of 1986, as amended (or the Treasury Regulations), our Board of Directors determines that it is no longer in our best interest to qualify as a REIT. We may make loans to third parties, including, without limitation, to joint ventures in which we participate or in connection with the disposition of a property. We intend to make investments in such a way that we will not be treated as an investment company under the 1940 Act. Our policies with respect to these and other activities may be reviewed and modified or amended from time to time by the Board of Directors.

Sustainability

As one of the largest owners and developers of office properties in the United States, we actively work to promote our growth and operations in a sustainable and responsible manner across our four regions. We focus our sustainability initiatives on the design and construction of our new developments, the operation of our existing buildings and our internal corporate practices. Our sustainability initiatives are centered on energy efficiency, waste reduction and water preservation, as well as making a positive impact on the communities in which we conduct business. Through these efforts we demonstrate that operating and developing commercial real estate can be conducted with a conscious regard for the environment while mutually benefiting our tenants, investors, employees and the communities in which we operate. We provide disclosure on our website to increase the transparency of our sustainability program, which we periodically update with current or additional information. You may access our sustainability report on our website at http://www.bostonproperties.com under the heading “Sustainability.”

Competition

We compete in the leasing of office, retail and residential space with a considerable number of other real estate companies, some of which may have greater marketing and financial resources than are available to us. In addition, our hotel property competes for guests with other hotels, some of which may have greater marketing and financial resources than are available to us and to the manager of our one hotel, Marriott International, Inc.

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Principal factors of competition in our primary business of owning, acquiring and developing office properties are the quality of properties, leasing terms (including rent and other charges and allowances for tenant improvements), attractiveness and convenience of location, the quality and breadth of tenant services provided, and reputation as an owner and operator of quality office properties in the relevant market. Additionally, our ability to compete depends upon, among other factors, trends of the national and local economies, investment alternatives, financial condition and operating results of current and prospective tenants, availability and cost of capital, construction and renovation costs, taxes, utilities, governmental regulations, legislation and population trends.

In addition, although not part of our core strategy, we are currently developing one residential property and operate two residential properties and may in the future decide to acquire or develop additional residential properties. As an owner and operator of apartments, we will also face competition for prospective residents from other operators whose properties may be perceived to offer a better location or better amenities or whose rent may be perceived as a better value given the quality, location and amenities that the resident seeks. We will also compete against condominiums and single-family homes that are for sale or rent. Because we have limited experience with residential properties, we expect to retain third parties to manage our residential properties.

Our Hotel Property

We operate our hotel property through a taxable REIT subsidiary. The taxable REIT subsidiary, a wholly-owned subsidiary of BPLP, is the lessee pursuant to a lease for the hotel property. As lessor, BPLP is entitled to a percentage of gross receipts from the hotel property. The hotel lease allows economic benefits of ownership to flow to us. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreements. Marriott has been engaged under a separate long-term incentive management agreement to operate and manage the hotel on behalf of the taxable REIT subsidiary. In connection with these arrangements, Marriott has agreed to operate and maintain our hotel in accordance with its system-wide standard for comparable hotels and to provide the hotel with the benefits of its central reservation system and other chain-wide programs and services. Under a management agreement for the hotel, Marriott acts as the taxable REIT subsidiary’s agent to supervise, direct and control the management and operation of the hotel and receives as compensation base management fees that are calculated as a percentage of the hotel’s gross revenues, and supplemental incentive fees if the hotel exceeds negotiated profitability breakpoints. In addition, the taxable REIT subsidiary compensates Marriott, on the basis of a formula applied to the hotel’s gross revenues, for certain system-wide services provided by Marriott, including central reservations, marketing and training. During 2013, 2012 and 2011, Marriott received an aggregate of approximately $1.2 million, $2.0 million and $2.5 million, respectively, from our taxable REIT subsidiary.

Seasonality

Our hotel property traditionally has experienced significant seasonality in its operating income, with the percentage of net operating income by quarter over the year ended December 31, 2013 shown below.

First Quarter	Second Quarter	Third Quarter	Fourth Quarter
11%	32%	34%	23%

Corporate Governance

Boston Properties is currently governed by an eleven member Board of Directors. The current members of our Board of Directors are Mortimer B. Zuckerman, Zoë Baird Budinger, Carol B. Einiger, Dr. Jacob A. Frenkel, Joel I. Klein, Douglas T. Linde, Matthew J. Lustig, Alan J. Patricof, Owen D. Thomas, Martin Turchin and David

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A. Twardock. All directors stand for election for one-year terms expiring at the next succeeding annual meeting of stockholders.

Our Board of Directors has Audit, Compensation and Nominating and Corporate Governance Committees. The membership of each of these committees is described below.

Name of Director	Audit	Compensation	Nominating and Corporate     Governance
Zoë Baird Budinger	X
Carol B. Einiger		X
Dr. Jacob A. Frenkel		X	X*
Joel I. Klein	X		X
Alan J. Patricof	X*		X
David A. Twardock	X	X*

X=Committee member, *=Chair

• Our Board of Directors has adopted charters for each of its Audit, Compensation and Nominating and Corporate Governance Committees. A copy of each of these charters is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Committees and Charters.”

• Our Board of Directors has adopted Corporate Governance Guidelines, a copy of which is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Governance Guidelines.”

• Our Board of Directors has adopted a Code of Business Conduct and Ethics, which governs business decisions made and actions taken by our directors, officers and employees. A copy of this code is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Code of Conduct and Ethics.” We intend to disclose on this website any amendment to, or waiver of, any provisions of this Code applicable to our directors and executive officers that would otherwise be required to be disclosed under the rules of the SEC or the New York Stock Exchange.

• Our Board of Directors has established an ethics reporting system that employees may use to anonymously report possible violations of the Code of Business Conduct and Ethics, including concerns regarding questionable accounting, internal accounting controls or auditing matters, by telephone or over the internet.

• Our Board of Directors has adopted a Policy on Company Political Spending, a copy of which is available on our website at http://www.bostonproperties.com under the heading “Corporate Governance” and subheading “Policy on Political Spending.”

Supplemental U.S. Federal Income Tax Considerations

As of January 1, 2013, (1) the maximum tax rate on “qualified dividend income” for individuals is 20%, (2) the maximum tax rate on long-term capital gain for individuals is 20%, (3) the highest marginal individual income tax rate is 39.6%, and (4) the backup withholding rate remains at 28%.

In addition, the effective date for U.S. withholding taxes that may apply, in certain circumstances, under the Foreign Account Tax Compliance Act, has been extended. In particular, withholding on interest and dividends now applies starting June 30, 2014, and withholding on gross proceeds from the sale of our stock or our Operating Partnership’s notes now applies starting December 31, 2016.

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Item 1A. Risk Factors.

Set forth below are the risks that we believe are material to our investors. We refer to the shares of our common stock and the units of limited partnership interest in BPLP together as our “securities,” and the investors who own shares or units, or both, as our “securityholders.” This section contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements beginning on page 51.

Our performance and value are subject to risks associated with our real estate assets and with the real estate industry.

Our economic performance and the value of our real estate assets, and consequently the value of our securities, are subject to the risk that if our properties do not generate revenues sufficient to meet our operating expenses, including debt service and capital expenditures, our cash flow and ability to pay distributions to our securityholders will be adversely affected. The following factors, among others, may adversely affect the income generated by our properties:

• downturns in the national, regional and local economic conditions (particularly increases in unemployment);

• competition from other office, hotel, retail and residential buildings;

• local real estate market conditions, such as oversupply or reduction in demand for office, hotel, retail or residential space;

• changes in interest rates and availability of financing;

• vacancies, changes in market rental rates and the need to periodically repair, renovate and re-let space;

• changes in space utilization by our tenants due to technology, economic conditions and business culture;

• increased operating costs, including insurance expense, utilities, real estate taxes, state and local taxes and heightened security costs;

• civil disturbances, earthquakes and other natural disasters, or terrorist acts or acts of war which may result in uninsured or underinsured losses;

• significant expenditures associated with each investment, such as debt service payments, real estate taxes, insurance and maintenance costs which are generally not reduced when circumstances cause a reduction in revenues from a property;

• declines in the financial condition of our tenants and our ability to collect rents from our tenants; and

• decreases in the underlying value of our real estate.

We are dependent upon the economic climates of our markets—Boston, New York, San Francisco and Washington, DC.

Substantially all of our revenue is derived from properties located in four markets: Boston, New York, San Francisco and Washington, DC. A downturn in the economies of these markets, or the impact that a downturn in the overall national economy may have upon these economies, could result in reduced demand for office space. Because our portfolio consists primarily of office buildings (as compared to a more diversified real estate portfolio), a decrease in demand for office space in turn could adversely affect our results of operations. Additionally, there are submarkets within our markets that are dependent upon a limited number of industries. For example, in our Washington, DC market we focus on leasing office properties to governmental agencies and contractors, as well as legal firms. A reduction in spending by the federal government could result in reduced demand for office space and adversely effect our results of operations. In addition, in our New York market we have historically leased properties to financial, legal and other professional firms. A significant downturn in one or more of these sectors could adversely affect our results of operations.

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In addition, a significant economic downturn over a period of time could result in an event or change in circumstances that results in an impairment in the value of our properties or our investments in unconsolidated joint ventures. An impairment loss is recognized if the carrying amount of the asset (1) is not recoverable over its expected holding period and (2) exceeds its fair value. There can be no assurance that we will not take charges in the future related to the impairment of our assets or investments. Any future impairment could have a material adverse effect on our results of operations in the period in which the charge is taken.

Our investment in property development may be more costly than anticipated.

We intend to continue to develop and substantially renovate office and residential properties. Our current and future development and construction activities may be exposed to the following risks:

• we may be unable to proceed with the development of properties because we cannot obtain financing on favorable terms or at all;

• we may incur construction costs for a development project that exceed our original estimates due to increases in interest rates and increased materials, labor, leasing or other costs, which could make completion of the project less profitable because market rents may not increase sufficiently to compensate for the increase in construction costs;

• we may be unable to obtain, or face delays in obtaining, required zoning, land-use, building, occupancy, and other governmental permits and authorizations, which could result in increased costs and could require us to abandon our activities entirely with respect to a project;

• we may abandon development opportunities after we begin to explore them and as a result we may lose deposits or fail to recover expenses already incurred;

• we may expend funds on and devote management’s time to projects which we do not complete;

• we may be unable to complete construction and/or leasing of a property on schedule; and

• we may suspend development projects after construction has begun due to changes in economic conditions or other factors, and this may result in the write-off of costs, payment of additional costs or increases in overall costs when the development project is restarted.

Investment returns from our developed properties may be less than anticipated.

Our developed properties may be exposed to the following risks:

• we may lease developed properties at rental rates that are less than the rates projected at the time we decide to undertake the development;

• operating expenses may be greater than projected at the time of development, resulting in our investment being less profitable than we expected; and

• occupancy rates and rents at newly developed properties may fluctuate depending on a number of factors, including market and economic conditions, and may result in our investments being less profitable than we expected or not profitable at all.

We face risks associated with the development of mixed-use commercial properties.

We operate, are currently developing, and may in the future develop, properties either alone or through joint ventures with other persons that are known as “mixed-use” developments. This means that in addition to the development of office space, the project may also include space for residential, retail, hotel or other commercial purposes. We have limited experience in developing and managing non-office and non-retail real estate. As a result, if a development project includes a non-office or non-retail use, we may seek to develop that component ourselves, sell the rights to that component to a third-party developer with experience in that use or we may seek to partner with such a developer. If we do not sell the rights or partner with such a developer, or if we choose to

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develop the other component ourselves, we would be exposed not only to those risks typically associated with the development of commercial real estate generally, but also to specific risks associated with the development and ownership of non-office and non-retail real estate. In addition, even if we sell the rights to develop the other component or elect to participate in the development through a joint venture, we may be exposed to the risks associated with the failure of the other party to complete the development as expected. These include the risk that the other party would default on its obligations necessitating that we complete the other component ourselves (including providing any necessary financing). In the case of residential properties, these risks include competition for prospective residents from other operators whose properties may be perceived to offer a better location or better amenities or whose rent may be perceived as a better value given the quality, location and amenities that the resident seeks. We will also compete against condominiums and single-family homes that are for sale or rent. Because we have limited experience with residential properties, we expect to retain third parties to manage our residential properties. If we decide to not sell or participate in a joint venture and instead hire a third party manager, we would be dependent on them and their key personnel who provide services to us and we may not find a suitable replacement if the management agreement is terminated, or if key personnel leave or otherwise become unavailable to us.

We face risks associated with the use of debt to fund acquisitions and developments, including refinancing risk.

We are subject to the risks normally associated with debt financing, including the risk that our cash flow will be insufficient to meet required payments of principal and interest. We anticipate that only a small portion of the principal of our debt will be repaid prior to maturity. Therefore, we are likely to need to refinance at least a portion of our outstanding debt as it matures. There is a risk that we may not be able to refinance existing debt or that the terms of any refinancing will not be as favorable as the terms of our existing debt. If principal payments due at maturity cannot be refinanced, extended or repaid with proceeds from other sources, such as new equity capital, our cash flow may not be sufficient to repay all maturing debt in years when significant “balloon” payments come due. In addition, we may rely on debt to fund a portion of our new investments such as our acquisition and development activity. There is a risk that we may be unable to finance these activities on favorable terms or at all. This risk is currently heightened because of tightened underwriting standards. These conditions, which increase the cost and reduce the availability of debt, may continue or worsen in the future.

We have agreements with a number of limited partners of BPLP who contributed properties in exchange for partnership interests that require BPLP to maintain for specified periods of time secured debt on certain of our assets and/or allocate partnership debt to such limited partners to enable them to continue to defer recognition of their taxable gain with respect to the contributed property. These tax protection and debt allocation agreements may restrict our ability to repay or refinance debt.

Adverse economic and geopolitical conditions and dislocations in the credit markets could have a material adverse effect on our results of operations, financial condition and ability to pay distributions to you.

Our business may be affected by market and economic challenges experienced by the U.S. economy or real estate industry as a whole, by the local economic conditions in the markets in which our properties are located, including the continuing impact of high unemployment, and by international economic conditions. These current conditions, or similar conditions existing in the future, may adversely affect our results of operations, financial condition and ability to pay distributions as a result of the following, among other potential consequences:

• the financial condition of our tenants, many of which are financial, legal and other professional firms, may be adversely affected, which may result in tenant defaults under leases due to bankruptcy, lack of liquidity, operational failures or for other reasons;

• significant job losses in the financial and professional services industries may occur, which may decrease demand for our office space, causing market rental rates and property values to be negatively impacted;

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• our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to pursue acquisition and development opportunities and refinance existing debt, reduce our returns from our acquisition and development activities and increase our future interest expense;

• reduced values of our properties may limit our ability to dispose of assets at attractive prices or to obtain debt financing secured by our properties and may reduce the availability of unsecured loans;

• the value and liquidity of our short-term investments and cash deposits could be reduced as a result of a deterioration of the financial condition of the institutions that hold our cash deposits or the institutions or assets in which we have made short-term investments, a dislocation of the markets for our short-term investments, increased volatility in market rates for such investments or other factors;

• one or more lenders under our line of credit could refuse to fund their financing commitment to us or could fail and we may not be able to replace the financing commitment of any such lenders on favorable terms, or at all; and

• to the extent we enter into derivative financial instruments, one or more counterparties to our derivative financial instruments could default on their obligations to us, or could fail, increasing the risk that we may not realize the benefits of these instruments.

An increase in interest rates would increase our interest costs on variable rate debt and could adversely impact our ability to refinance existing debt or sell assets on favorable terms or at all.

As of February 21, 2014, we had no outstanding indebtedness, excluding our unconsolidated joint ventures, that bears interest at variable rates, but we may incur such indebtedness in the future. If interest rates increase, then so would the interest costs on our unhedged variable rate debt, which could adversely affect our cash flow and our ability to pay principal and interest on our debt and our ability to make distributions to our securityholders. Further, rising interest rates could limit our ability to refinance existing debt when it matures or significantly increase our future interest expense. From time to time, we enter into interest rate swap agreements and other interest rate hedging contracts, including swaps, caps and floors. While these agreements are intended to lessen the impact of rising interest rates on us, they also expose us to the risk that the other parties to the agreements will not perform, we could incur significant costs associated with the settlement of the agreements, the agreements will be unenforceable and the underlying transactions will fail to qualify as highly-effective cash flow hedges under guidance included in ASC 815 “Derivatives and Hedging”. In addition, an increase in interest rates could decrease the amounts third-parties are willing to pay for our assets, thereby limiting our ability to change our portfolio promptly in response to changes in economic or other conditions.

Covenants in our debt agreements could adversely affect our financial condition.

The mortgages on our properties contain customary covenants such as those that limit our ability, without the prior consent of the lender, to further mortgage the applicable property or to discontinue insurance coverage. Our unsecured credit facility, unsecured debt securities and certain secured loans contain customary restrictions, requirements and other limitations on our ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt, which we must maintain. Our continued ability to borrow under our credit facilities is subject to compliance with our financial and other covenants. In addition, our failure to comply with such covenants could cause a default under the applicable debt agreement, and we may then be required to repay such debt with capital from other sources. Under those circumstances, other sources of capital may not be available to us, or be available only on unattractive terms. Additionally, in the future our ability to satisfy current or prospective lenders’ insurance requirements may be adversely affected if lenders generally insist upon greater insurance coverage against acts of terrorism or losses resulting from earthquakes than is available to us in the marketplace or on commercially reasonable terms.

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We rely on debt financing, including borrowings under our unsecured credit facility, issuances of unsecured debt securities and debt secured by individual properties, to finance our existing portfolio, our acquisition and development activities and for working capital. If we are unable to obtain debt financing from these or other sources, or to refinance existing indebtedness upon maturity, our financial condition and results of operations would likely be adversely affected. If we breach covenants in our debt agreements, the lenders can declare a default and, if the debt is secured, can take possession of the property securing the defaulted loan. In addition, our unsecured debt agreements contain specific cross-default provisions with respect to specified other indebtedness, giving the unsecured lenders the right to declare a default if we are in default under other loans in some circumstances. Defaults under our debt agreements could materially and adversely affect our financial condition and results of operations.

Our degree of leverage could limit our ability to obtain additional financing or affect the market price of our common stock or debt securities.

On February 21, 2014, our total consolidated debt was approximately $10.6 billion (i.e., excluding unconsolidated joint venture debt). Consolidated debt to total consolidated market capitalization ratio, defined as total consolidated debt as a percentage of the market value of our outstanding equity securities plus our total consolidated debt, is a measure of leverage commonly used by analysts in the REIT sector. Our total consolidated market capitalization was approximately $30.0 million at February 21, 2014. Total consolidated market capitalization was calculated using the closing stock price of $112.10 per common share and the following: (1) 153,006,302 shares of our common stock, (2) 15,582,151 outstanding common units of limited partnership interest in Boston Properties Limited Partnership (excluding common units held by us), (3) an aggregate of 874,168 common units issuable upon conversion of all outstanding Series Two Preferred Units of partnership interest in Boston Properties Limited Partnership, (4) an aggregate of 1,571,467 common units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, (5) 360,126 Series Four Preferred Units of partnership interest multiplied by the fixed liquidation preference of $50 per unit, (6) 80,000 shares (8,000,000 depositary shares, each representing 1/100th of a share), of our 5.25% Series B Cumulative Redeemable Preferred Stock, at a price of $2,500 per share ($25 per depositary share) and (7) our consolidated debt totaling approximately $10.6 billion. The calculation of total consolidated market capitalization does not include 396,150 2012 OPP Units, 316,325 2013 MYLTIP Units and 485,459 2014 MYLTIP Units because, unlike other LTIP Units, they are not earned until certain return thresholds are achieved. Our total consolidated debt, which excludes debt collateralized by our unconsolidated joint ventures, at February 21, 2014 represented approximately 35.31% of our total consolidated market capitalization. This percentage will fluctuate with changes in the market price of our common stock and does not necessarily reflect our capacity to incur additional debt to finance our activities or our ability to manage our existing debt obligations. However, for a company like ours, whose assets are primarily income-producing real estate, the consolidated debt to total consolidated market capitalization ratio may provide investors with an alternate indication of leverage, so long as it is evaluated along with other financial ratios and the various components of our outstanding indebtedness.

Our degree of leverage could affect our ability to obtain additional financing for working capital, capital expenditures, acquisitions, development or other general corporate purposes. Our senior unsecured debt is currently rated investment grade by the three major rating agencies. However, there can be no assurance that we will be able to maintain this rating, and in the event our senior debt is downgraded from its current rating, we would likely incur higher borrowing costs and/or difficulty in obtaining additional financing. Our degree of leverage could also make us more vulnerable to a downturn in business or the economy generally. There is a risk that changes in our debt to market capitalization ratio, which is in part a function of our stock price, or our ratio of indebtedness to other measures of asset value used by financial analysts may have an adverse effect on the market price of our equity or debt securities.

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We face risks associated with property acquisitions.

We have acquired in the past and intend to continue to pursue the acquisition of properties and portfolios of properties, including large portfolios that could increase our size and result in alterations to our capital structure. Our acquisition activities and their success are subject to the following risks:

• even if we enter into an acquisition agreement for a property, we may be unable to complete that acquisition after making a non-refundable deposit and incurring certain other acquisition-related costs;

• we may be unable to obtain or assume financing for acquisitions on favorable terms or at all;

• acquired properties may fail to perform as expected;

• the actual costs of repositioning, redeveloping or maintaining acquired properties may be greater than our estimates;

• the acquisition agreement will likely contain conditions to closing, including completion of due diligence investigations to our satisfaction or other conditions that are not within our control, which may not be satisfied;

• acquired properties may be located in new markets, either within or outside the United States, where we may face risks associated with a lack of market knowledge or understanding of the local economy, lack of business relationships in the area and unfamiliarity with local governmental and permitting procedures;

• we may acquire real estate through the acquisition of the ownership entity subjecting us to the risks of that entity; and

• we may be unable to quickly and efficiently integrate new acquisitions, particularly acquisitions of portfolios of properties, into our existing operations, and this could have an adverse effect on our results of operations and financial condition.

We have acquired in the past and in the future may acquire properties through the acquisition of first mortgage or mezzanine debt. Investments in these loans must be carefully structured to ensure that we satisfy the various asset and income requirements applicable to REITs. If we fail to structure any such acquisition properly, we could fail to qualify as a REIT. In addition, acquisitions of first mortgage or mezzanine loans subject us to the risks associated with the borrower’s default, including potential bankruptcy, and there may be significant delays and costs associated with the process of foreclosure on collateral securing or supporting these investments. There can be no assurance that we would recover any or all of our investment in the event of such a default or bankruptcy.

We have acquired in the past and in the future may acquire properties or portfolios of properties through tax deferred contribution transactions in exchange for partnership interests in BPLP. This acquisition structure has the effect, among others, of reducing the amount of tax depreciation we can deduct over the tax life of the acquired properties, and typically requires that we agree to protect the contributors’ ability to defer recognition of taxable gain through restrictions on our ability to dispose of the acquired properties and/or the allocation of partnership debt to the contributors to maintain their tax bases. These restrictions could limit our ability to sell an asset at a time, or on terms, that would be favorable absent such restrictions.

Any future international activities will be subject to special risks and we may not be able to effectively manage our international business.

We have underwritten, and in the future may acquire, properties, portfolios of properties or interests in real-estate related entities on a strategic or selective basis in international markets that are new to us. If we acquire properties or platforms located in these markets, we will face risks associated with a lack of market knowledge and understanding of the local economy, forging new business relationships in the area and unfamiliarity with

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local laws and government and permitting procedures. In addition, our international operations will be subject to the usual risks of doing business abroad such as possible revisions in tax treaties or other laws and regulations, including those governing the taxation of our international income, restrictions on the transfer of funds and uncertainty over terrorist activities. We cannot predict the likelihood that any of these developments may occur. Further, we may in the future enter into agreements with non-U.S. entities that are governed by the laws of, and are subject to dispute resolution in the courts of, another country or region. We cannot accurately predict whether such a forum would provide us with an effective and efficient means of resolving disputes that may arise.

Investments in international markets may also subject us to risks associated with funding increasing headcount, integrating new offices, and establishing effective controls and procedures to regulate the operations of new offices and to monitor compliance with U.S. laws and regulations such as the Foreign Corrupt Practices Act and similar foreign laws and regulations.

We may be subject to risks from potential fluctuations in exchange rates between the U.S. dollar and the currencies of the other countries in which we invest.

If we invest in countries where the U.S. dollar is not the national currency, we will be subject to international currency risks from the potential fluctuations in exchange rates between the U.S. dollar and the currencies of those other countries. A significant depreciation in the value of the currency of one or more countries where we have a significant investment may materially affect our results of operations. We may attempt to mitigate any such effects by borrowing in the currency of the country in which we are investing and, under certain circumstances, by hedging exchange rate fluctuations; however, access to capital may be more restricted, or unavailable on favorable terms or at all, in certain locations. For leases denominated in international currencies, we may use derivative financial instruments to manage the international currency exchange risk. We cannot assure you, however, that our efforts will successfully neutralize all international currency risks.

Acquired properties may expose us to unknown liability.

We may acquire properties subject to liabilities and without any recourse, or with only limited recourse, against the prior owners or other third parties with respect to unknown liabilities. As a result, if a liability were asserted against us based upon ownership of those properties, we might have to pay substantial sums to settle or contest it, which could adversely affect our results of operations and cash flow. Unknown liabilities with respect to acquired properties might include:

• liabilities for clean-up of undisclosed environmental contamination;

• claims by tenants, vendors or other persons against the former owners of the properties;

• liabilities incurred in the ordinary course of business; and

• claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.

Competition for acquisitions may result in increased prices for properties.

We plan to continue to acquire properties as we are presented with attractive opportunities. We may face competition for acquisition opportunities with other investors, and this competition may adversely affect us by subjecting us to the following risks:

• we may be unable to acquire a desired property because of competition from other well-capitalized real estate investors, including publicly traded and private REITs, institutional investment funds and other real estate investors; and

• even if we are able to acquire a desired property, competition from other real estate investors may significantly increase the purchase price.

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Our use of joint ventures may limit our flexibility with jointly owned investments.

In appropriate circumstances, we intend to develop, acquire and recapitalize properties in joint ventures with other persons or entities when circumstances warrant the use of these structures. We currently have joint ventures that are and are not consolidated within our financial statements. Our share of the aggregate revenue from all of our joint ventures represented approximately 14.9% of our total revenue (the sum of our total consolidated revenue and our share of such joint venture revenue) for the year ended December 31, 2013. Our participation in joint ventures is subject to the risks that:

• we could become engaged in a dispute with any of our joint venture partners that might affect our ability to develop or operate a property and could lead to the sale of either parties ownership interest or the property;

• some of our joint ventures are subject to debt and in the current credit markets the refinancing of such debt may require equity capital calls;

• our joint venture partners may default on their obligations necessitating that we fulfill their obligation ourselves;

• our joint venture partners may have different objectives than we have regarding the appropriate timing and terms of any sale or refinancing of properties;

• our joint venture partners may be structured differently than us for tax purposes and this could create conflicts of interest;

• our joint venture partners may have competing interests in our markets that could create conflicts of interest; and

• our joint ventures may be unable to repay any amounts that we may loan to them.

Our properties face significant competition.

We face significant competition from developers, owners and operators of office and residential properties and other commercial real estate, including sublease space available from our tenants. Substantially all of our properties face competition from similar properties in the same market. This competition may affect our ability to attract and retain tenants and may reduce the rents we are able to charge. These competing properties may have vacancy rates higher than our properties, which may result in their owners being willing to lease available space at lower rates than the space in our properties.

We face potential difficulties or delays renewing leases or re-leasing space.

We derive most of our income from rent received from our tenants. If a tenant experiences a downturn in its business or other types of financial distress, it may be unable to make timely rental payments. Also, when our tenants decide not to renew their leases or terminate early, we may not be able to re-let the space. Even if tenants decide to renew or lease new space, the terms of renewals or new leases, including the cost of required renovations or concessions to tenants, may be less favorable to us than current lease terms. As a result, our cash flow could decrease and our ability to make distributions to our securityholders could be adversely affected.

We face potential adverse effects from major tenants’ bankruptcies or insolvencies.

The bankruptcy or insolvency of a major tenant may adversely affect the income produced by our properties. Our tenants could file for bankruptcy protection or become insolvent in the future. We cannot evict a tenant solely because of its bankruptcy. On the other hand, a bankrupt tenant may reject and terminate its lease with us. In such case, our claim against the bankrupt tenant for unpaid and future rent would be subject to a statutory cap that might be substantially less than the remaining rent actually owed under the lease, and, even so, our claim for unpaid rent would likely not be paid in full. This shortfall could adversely affect our cash flow and results of operations.

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We may have difficulty selling our properties, which may limit our flexibility.

Properties like the ones that we own could be difficult to sell. This may limit our ability to change our portfolio promptly in response to changes in economic or other conditions. In addition, federal tax laws limit our ability to sell properties and this may affect our ability to sell properties without adversely affecting returns to our securityholders. These restrictions reduce our ability to respond to changes in the performance of our investments and could adversely affect our financial condition and results of operations.

Our ability to dispose of some of our properties is constrained by their tax attributes. Properties which we developed and have owned for a significant period of time or which we acquired through tax deferred contribution transactions in exchange for partnership interests in BPLP often have low tax bases. Furthermore, as a REIT, we may be subject to a 100% “prohibited transactions” tax on the gain from dispositions of property if we are deemed to hold the property primarily for sale to customers in the ordinary course of business, unless the disposition qualifies under a safe harbor exception for properties that have been held for at least two years and with respect to which certain other requirements are met. The potential application of the prohibited transactions tax could cause us to forego potential dispositions of property or other opportunities that might otherwise be attractive to us, or to undertake such dispositions or other opportunities through a taxable REIT subsidiary, which would generally result in income taxes being incurred. If we dispose of these properties outright in taxable transactions, we may be required to distribute a significant amount of the taxable gain to our securityholders under the requirements of the Internal Revenue Code for REITs, which in turn would impact our future cash flow and may increase our leverage. In some cases, without incurring additional costs we may be restricted from disposing of properties contributed in exchange for our partnership interests under tax protection agreements with contributors. To dispose of low basis or tax-protected properties efficiently we from time to time use like-kind exchanges, which qualify for non-recognition of taxable gain, but can be difficult to consummate and result in the property for which the disposed assets are exchanged inheriting their low tax bases and other tax attributes (including tax protection covenants).

Because we own a hotel property, we face the risks associated with the hospitality industry.

The following factors, among others, are common to the hotel industry, and may reduce the receipts generated by our hotel property:

• our hotel property competes for guests with other hotels, a number of which have greater marketing and financial resources than our hotel-operating business partners;

• if there is an increase in operating costs resulting from inflation and other factors, our hotel-operating business partners may not be able to offset such increase by increasing room rates;

• our hotel property is subject to the fluctuating and seasonal demands of business travelers and tourism; and

• our hotel property is subject to general and local economic and social conditions that may affect demand for travel in general, including war and terrorism.

In addition, because our hotel property is located in Cambridge, Massachusetts, it is subject to the Cambridge market’s fluctuations in demand, increases in operating costs and increased competition from additions in supply.

We face risks associated with short-term liquid investments.

We continue to have significant cash balances that we invest in a variety of short-term investments that are intended to preserve principal value and maintain a high degree of liquidity while providing current income. From time to time, these investments may include (either directly or indirectly):

• direct obligations issued by the U.S. Treasury;

• obligations issued or guaranteed by the U.S. government or its agencies;

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• taxable municipal securities;

• obligations (including certificates of deposit) of banks and thrifts;

• commercial paper and other instruments consisting of short-term U.S. dollar denominated obligations issued by corporations and banks;

• repurchase agreements collateralized by corporate and asset-backed obligations;

• both registered and unregistered money market funds; and

• other highly rated short-term securities.

Investments in these securities and funds are not insured against loss of principal. Under certain circumstances we may be required to redeem all or part of our investment, and our right to redeem some or all of our investment may be delayed or suspended. In addition, there is no guarantee that our investments in these securities or funds will be redeemable at par value. A decline in the value of our investment or a delay or suspension of our right to redeem may have a material adverse effect on our results of operations or financial condition.

Failure to qualify as a real estate investment trust would cause us to be taxed as a corporation, which would substantially reduce funds available for payment of dividends.

If we fail to qualify as a REIT for federal income tax purposes, we will be taxed as a corporation unless certain relief provisions apply. We believe that we are organized and qualified as a REIT and intend to operate in a manner that will allow us to continue to qualify as a REIT. However, we cannot assure you that we are qualified as such, or that we will remain qualified as such in the future. This is because qualification as a REIT involves the application of highly technical and complex provisions of the Internal Revenue Code as to which there are only limited judicial and administrative interpretations and involves the determination of facts and circumstances not entirely within our control. Future legislation, new regulations, administrative interpretations or court decisions may significantly change the tax laws or the application of the tax laws with respect to qualification as a REIT for federal income tax purposes or the federal income tax consequences of such qualification.

In addition, we currently hold certain of our properties through subsidiaries that have elected to be taxed as REITs and we may in the future determine that it is in our best interests to hold one or more of our other properties through one or more subsidiaries that elect to be taxed as REITs. If any of these subsidiaries fails to qualify as a REIT for federal income tax purposes, then we may also fail to qualify as a REIT for federal income tax purposes.

If we fail to qualify as a REIT then, unless certain relief provisions apply, we will face serious tax consequences that will substantially reduce the funds available for payment of dividends for each of the years involved because:

• we would not be allowed a deduction for dividends paid to stockholders in computing our taxable income and would be subject to federal income tax at regular corporate rates;

• we also could be subject to the federal alternative minimum tax and possibly increased state and local taxes; and

• unless we are entitled to relief under statutory provisions, we could not elect to be subject to tax as a REIT for four taxable years following the year during which we were disqualified.

In addition, if we fail to qualify as a REIT and the relief provisions do not apply, we will no longer be required to pay dividends. As a result of all these factors, our failure to qualify as a REIT could impair our ability to raise capital and expand our business, and it would adversely affect the value of our common stock. If we fail

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to qualify as a REIT but are eligible for certain relief provisions, then we may retain our status as a REIT but may be required to pay a penalty tax, which could be substantial.

In order to maintain our REIT status, we may be forced to borrow funds during unfavorable market conditions.

In order to maintain our REIT status, we may need to borrow funds on a short-term basis to meet the REIT distribution requirements, even if the then-prevailing market conditions are not favorable for these borrowings. To qualify as a REIT, we generally must distribute to our stockholders at least 90% of our net taxable income each year, excluding capital gains. In addition, we will be subject to a 4% nondeductible excise tax on the amount, if any, by which dividends paid by us in any calendar year are less than the sum of 85% of our ordinary income, 95% of our capital gain net income and 100% of our undistributed income from prior years. We may need short-term debt or long-term debt or proceeds from asset sales, creation of joint ventures or sales of common stock to fund required distributions as a result of differences in timing between the actual receipt of income and the recognition of income for federal income tax purposes, or the effect of non-deductible capital expenditures, the creation of reserves or required debt or amortization payments. The inability of our cash flows to cover our distribution requirements could have an adverse impact on our ability to raise short- and long-term debt or sell equity securities in order to fund distributions required to maintain our REIT status.

Limits on changes in control may discourage takeover attempts beneficial to stockholders.

Provisions in our Charter and bylaws, our shareholder rights agreement and the limited partnership agreement of BPLP, as well as provisions of the Internal Revenue Code and Delaware corporate law, may:

• delay or prevent a change of control over us or a tender offer, even if such action might be beneficial to our stockholders; and

• limit our stockholders’ opportunity to receive a potential premium for their shares of common stock over then-prevailing market prices.

Stock Ownership Limit

To facilitate maintenance of our qualification as a REIT and to otherwise address concerns relating to concentration of stock ownership, our Charter generally prohibits ownership, directly, indirectly or beneficially, by any single stockholder of more than 6.6% of the number of outstanding shares of any class or series of our common stock. We refer to this limitation as the “ownership limit.” Our Board of Directors may waive, in its sole discretion, or modify the ownership limit with respect to one or more persons if it is satisfied that ownership in excess of this limit will not jeopardize our status as a REIT for federal income tax purposes. In addition, under our Charter each of Mortimer B. Zuckerman and the respective families and affiliates of Mortimer B. Zuckerman and Edward H. Linde, as well as, in general, pension plans and mutual funds, may actually and beneficially own up to 15% of the number of outstanding shares of any class or series of our equity common stock. Shares owned in violation of the ownership limit will be subject to the loss of rights to distributions and voting and other penalties. The ownership limit may have the effect of inhibiting or impeding a change in control.

BPLP’s Partnership Agreement

We have agreed in the limited partnership agreement of BPLP not to engage in specified extraordinary transactions, including, among others, business combinations, unless limited partners of BPLP other than us receive, or have the opportunity to receive, either (1) the same consideration for their partnership interests as holders of our common stock in the transaction or (2) limited partnership units that, among other things, would entitle the holders, upon redemption of these units, to receive shares of common equity of a publicly traded company or the same consideration as holders of our common stock received in the transaction. If these limited partners would not receive such consideration, we cannot engage in the transaction unless limited partners

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holding at least 75% of the common units of limited partnership interest, other than those held by Boston Properties, Inc. or its affiliates, consent to the transaction. In addition, we have agreed in the limited partnership agreement of BPLP that we will not complete specified extraordinary transactions, including among others, business combinations, in which we receive the approval of our common stockholders unless (1) limited partners holding at least 75% of the common units of limited partnership interest, other than those held by Boston Properties, Inc. or its affiliates, consent to the transaction or (2) the limited partners of BPLP are also allowed to vote and the transaction would have been approved had these limited partners been able to vote as common stockholders on the transaction. Therefore, if our common stockholders approve a specified extraordinary transaction, the partnership agreement requires the following before we can complete the transaction:

• holders of partnership interests in BPLP, including Boston Properties, Inc., must vote on the matter;

• Boston Properties, Inc. must vote its partnership interests in the same proportion as our stockholders voted on the transaction; and

• the result of the vote of holders of partnership interests in BPLP must be such that had such vote been a vote of stockholders, the business combination would have been approved.

As a result of these provisions, a potential acquirer may be deterred from making an acquisition proposal, and we may be prohibited by contract from engaging in a proposed extraordinary transaction, including a proposed business combination, even though our stockholders approve of the transaction.

Shareholder Rights Plan

We have a shareholder rights plan. Under the terms of this plan, we can in effect prevent a person or group from acquiring more than 15% of the outstanding shares of our common stock because, unless we approve of the acquisition, after the person acquires more than 15% of our outstanding common stock, all other stockholders will have the right to purchase securities from us at a price that is less than their then fair market value. This would substantially reduce the value and influence of the stock owned by the acquiring person. Our Board of Directors can prevent the plan from operating by approving the transaction in advance, which gives us significant power to approve or disapprove of the efforts of a person or group to acquire a large interest in our company.

Changes in market conditions could adversely affect the market price of our common stock.

As with other publicly traded equity securities, the value of our common stock depends on various market conditions that may change from time to time. Among the market conditions that may affect the value of our common stock are the following:

• the extent of investor interest in our securities;

• the general reputation of REITs and the attractiveness of our equity securities in comparison to other equity securities, including securities issued by other real estate-based companies;

• our underlying asset value;

• investor confidence in the stock and bond markets, generally;

• national economic conditions;

• changes in tax laws;

• our financial performance;

• changes in our credit ratings; and

• general stock and bond market conditions.

The market value of our common stock is based primarily upon the market’s perception of our growth potential and our current and potential future earnings and cash dividends. Consequently, our common stock may

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trade at prices that are greater or less than our net asset value per share of common stock. If our future earnings or cash dividends are less than expected, it is likely that the market price of our common stock will diminish.

Further issuances of equity securities may be dilutive to current securityholders.

The interests of our existing securityholders could be diluted if additional equity securities are issued to finance future developments, acquisitions, or repay indebtedness. Our ability to execute our business strategy depends on our access to an appropriate blend of debt financing, including unsecured lines of credit and other forms of secured and unsecured debt, and equity financing, including common and preferred equity.

The number of shares available for future sale could adversely affect the market price of our stock.

In connection with and subsequent to our initial public offering, we have completed many private placement transactions in which shares of stock of Boston Properties, Inc. or partnership interests in BPLP were issued to owners of properties we acquired or to institutional investors. This common stock, or common stock issuable in exchange for such partnership interests in BPLP, may be sold in the public securities markets over time under registration rights we granted to these investors. Additional common stock issuable under our employee benefit and other incentive plans, including as a result of the grant of stock options and restricted equity securities, may also be sold in the market at some time in the future. Future sales of our common stock in the market could adversely affect the price of our common stock. We cannot predict the effect the perception in the market that such sales may occur will have on the market price of our common stock.

We may change our policies without obtaining the approval of our stockholders.

Our operating and financial policies, including our policies with respect to acquisitions of real estate, growth, operations, indebtedness, capitalization and dividends, are exclusively determined by our Board of Directors. Accordingly, our securityholders do not control these policies.

Our success depends on key personnel whose continued service is not guaranteed.

We depend on the efforts of key personnel, particularly Mortimer B. Zuckerman, Executive Chairman, Owen D. Thomas, our Chief Executive Officer, Douglas T. Linde, our President, and Raymond A. Ritchey, Executive Vice President, National Director of Acquisitions and Development. Among the reasons that Messrs. Zuckerman, Thomas, Linde and Ritchey are important to our success is that each has a national reputation, which attracts business and investment opportunities and assists us in negotiations with lenders, joint venture partners and other investors. If we lost their services, our relationships with lenders, potential tenants and industry personnel could diminish. Mr. Zuckerman has substantial outside business interests that could interfere with his ability to devote his full time to our business and affairs.

Our Chief Financial Officer and Regional Managers also have strong reputations. Their reputations aid us in identifying opportunities, having opportunities brought to us, and negotiating with tenants and build-to-suit prospects. While we believe that we could find replacements for these key personnel, the loss of their services could materially and adversely affect our operations because of diminished relationships with lenders, prospective tenants and industry personnel.

Conflicts of interest exist with holders of interests in BPLP.

Sales of properties and repayment of related indebtedness will have different effects on holders of interests in BPLP than on our stockholders.

Some holders of interests in BPLP, including Mr. Zuckerman, could incur adverse tax consequences upon the sale of certain of our properties and on the repayment of related debt which differ from the tax consequences

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to us and our stockholders. Consequently, these holders of partnership interests in BPLP may have different objectives regarding the appropriate pricing and timing of any such sale or repayment of debt. While we have exclusive authority under the limited partnership agreement of BPLP to determine when to refinance or repay debt or whether, when, and on what terms to sell a property, subject, in the case of certain properties, to the contractual commitments described below, any such decision would require the approval of our Board of Directors. While the Board of Directors has a policy with respect to these matters, as directors and executive officers, Messrs. Zuckerman and D. Linde could exercise their influence in a manner inconsistent with the interests of some, or a majority, of our stockholders, including in a manner which could prevent completion of a sale of a property or the repayment of indebtedness.

Agreement not to sell some properties.

We have entered into agreements with respect to some properties that we have acquired in exchange for partnership interests in BPLP. Pursuant to those agreements, we have agreed not to sell or otherwise transfer some of our properties, prior to specified dates, in any transaction that would trigger taxable income and we are responsible for the reimbursement of certain tax-related costs to the prior owners if the subject properties are sold in a taxable sale. In general, our obligations to the prior owners are limited in time and only apply to actual damages suffered. As of December 31, 2013, there were a total of three properties subject to these restrictions. In the aggregate, all properties subject to the restrictions accounted for approximately 11% of our total revenue (the sum of our total consolidated revenue and our share of joint venture revenue) for the year ended December 31, 2013.

BPLP has also entered into agreements providing prior owners of properties with the right to guarantee specific amounts of indebtedness and, in the event that the specific indebtedness they guarantee is repaid or reduced, additional and/or substitute indebtedness. These agreements may hinder actions that we may otherwise desire to take to repay or refinance guaranteed indebtedness because we would be required to make payments to the beneficiaries of such agreements if we violate these agreements.

Mr. Zuckerman will continue to engage in other activities.

Mr. Zuckerman has a broad and varied range of investment interests. He could acquire an interest in a company which is not currently involved in real estate investment activities but which may acquire real property in the future. However, pursuant to his employment agreement, Mr. Zuckerman will not, in general, have management control over such companies and, therefore, he may not be able to prevent one or more of such companies from engaging in activities that are in competition with our activities.

Compliance or failure to comply with the Americans with Disabilities Act or other safety regulations and requirements could result in substantial costs.

The Americans with Disabilities Act generally requires that public buildings, including office buildings and hotels, be made accessible to disabled persons. Noncompliance could result in the imposition of fines by the federal government or the award of damages to private litigants. If, under the Americans with Disabilities Act, we are required to make substantial alterations and capital expenditures in one or more of our properties, including the removal of access barriers, it could adversely affect our financial condition and results of operations, as well as the amount of cash available for distribution to our securityholders.

Our properties are subject to various federal, state and local regulatory requirements, such as state and local fire and life safety requirements. If we fail to comply with these requirements, we could incur fines or private damage awards. We do not know whether existing requirements will change or whether compliance with future requirements will require significant unanticipated expenditures that will affect our cash flow and results of operations.

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Failure to comply with Federal government contractor requirements could result in substantial costs and loss of substantial revenue.

We are subject to compliance with a wide variety of complex legal requirements because we are a Federal government contractor. These laws regulate how we conduct business, require us to administer various compliance programs and require us to impose compliance responsibilities on some of our contractors. Our failure to comply with these laws could subject us to fines, penalties and damages, cause us to be in default of our leases and other contracts with the Federal government and bar us from entering into future leases and other contracts with the Federal government. There can be no assurance that these costs and loss of revenue will not have a material adverse effect on our properties, operations or business.

Some potential losses are not covered by insurance.

We carry insurance coverage on our properties of types and in amounts and with deductibles that we believe are in line with coverage customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market following the terrorist attacks of September 11, 2001, the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) was enacted in November 2002 to require regulated insurers to make available coverage for “certified” acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to December 31, 2014 by the Terrorism Risk Insurance Program Reauthorization Act of 2007 (“TRIPRA”) and we can provide no assurance that it will be extended further. Currently, the per occurrence limits of our portfolio property insurance program are $1.0 billion, including coverage for acts of terrorism certified under TRIA other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). We also carry $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billion of Terrorism Coverage in our property insurance program which is provided by IXP, LLC (“IXP”) as a direct insurer. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage, with $1.375 billion of Terrorism Coverage in excess of $250 million being provided by NYXP, LLC, (“NYXP”) as a direct insurer. We also currently carry nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIA (“NBCR Coverage”), which is provided by IXP, as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which we manage. The per occurrence limit for NBCR Coverage is $1 billion. Under TRIA, after the payment of the required deductible and coinsurance, the additional Terrorism Coverage provided by IXP for 601 Lexington Avenue, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $100 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. We may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in our portfolio or for any other reason. In the event TRIPRA is not extended beyond December 31, 2014, (i) we will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (ii) if such insurance is not available at commercially reasonable rates with limits equal to our current coverage or at all, we may not continue to have full occurrence limit coverage for acts of terrorism, (iii) we may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (iv) we may not be able to obtain future debt financings secured by individual properties and (v) we may cancel the insurance policies issued by IXP for the NBCR Coverage and the additional Terrorism Coverage for 601 Lexington Avenue and by NYXP for the Terrorism Coverage for 767 Fifth Avenue. We intend to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.

We also currently carry earthquake insurance on our properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that we believe are commercially reasonable. In addition,

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this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically, we currently carry earthquake insurance which covers our San Francisco region (excluding 535 Mission Street and the below grade improvements for Transbay Tower) with a $120 million per occurrence limit and a $120 million annual aggregate limit, $20 million of which is provided by IXP, as a direct insurer. The builders risk policy maintained for the development of 535 Mission Street in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. In addition, the builders risk policy maintained for the development of the below grade improvements of the Transbay Tower in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. The amount of our earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact our ability to finance properties subject to earthquake risk. We may discontinue earthquake insurance or change the structure of our earthquake insurance program on some or all of our properties in the future if the premiums exceed our estimation of the value of the coverage.

IXP, a captive insurance company which is a wholly-owned subsidiary, acts as a direct insurer with respect to a portion of our earthquake insurance coverage for our Greater San Francisco properties, the additional Terrorism Coverage for 601 Lexington Avenue and our NBCR Coverage. The additional Terrorism Coverage provided by IXP for 601 Lexington Avenue only applies to losses which exceed the program trigger under TRIA. NYXP, a captive insurance company which is a wholly-owned subsidiary, acts as a direct insurer with respect to a portion of our Terrorism Coverage for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program trigger under TRIA and NYXP reinsures with a third-party insurance company any coinsurance payable under TRIA. Insofar as we own IXP and NYXP, we are responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of our consolidated financial statements. In particular, if a loss occurs which is covered by our NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If we experience a loss and IXP or NYXP are required to pay under their insurance policies, we would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, our Operating Partnership has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

The mortgages on our properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. We provide the lenders on a regular basis with the identity of the insurance companies in our insurance programs. The ratings of some of our insurers are below the rating requirements in some of our loan agreements and the lenders for these loans could attempt to claim an event of default has occurred under the loan. We believe we could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future our ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers or amounts of insurance which are difficult to obtain or which result in a commercially unreasonable premium. There can be no assurance that a deficiency in the financial ratings of one or more of our insurers will not have a material adverse effect on us.

We continue to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but we cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which we cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes or other catastrophic events, if we experience a loss that is uninsured or that exceeds policy limits, we could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that we could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect our business and financial condition and results of operations.

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Actual or threatened terrorist attacks may adversely affect our ability to generate revenues and the value of our properties.

We have significant investments in large metropolitan markets that have been or may be in the future the targets of actual or threatened terrorism attacks, including Boston, New York, San Francisco and Washington, DC. As a result, some tenants in these markets may choose to relocate their businesses to other markets or to lower-profile office buildings within these markets that may be perceived to be less likely targets of future terrorist activity. This could result in an overall decrease in the demand for office space in these markets generally or in our properties in particular, which could increase vacancies in our properties or necessitate that we lease our properties on less favorable terms or both. In addition, future terrorist attacks in these markets could directly or indirectly damage our properties, both physically and financially, or cause losses that materially exceed our insurance coverage. As a result of the foregoing, our ability to generate revenues and the value of our properties could decline materially. See also “—Some potential losses are not covered by insurance.”

We face risks associated with our tenants and contractual counterparties being designated “Prohibited Persons” by the Office of Foreign Assets Control.

Pursuant to Executive Order 13224 and other laws, the Office of Foreign Assets Control of the United States Department of the Treasury (“OFAC”) maintains a list of persons designated as terrorists or who are otherwise blocked or banned (“Prohibited Persons”). OFAC regulations and other laws prohibit conducting business or engaging in transactions with Prohibited Persons (the “OFAC Requirements”). Certain of our loan and other agreements require us to comply with OFAC Requirements. We have established a compliance program whereby tenants and others with whom we conduct business are checked against the OFAC list of Prohibited Persons prior to entering into any agreement and on a periodic basis thereafter. Our leases and other agreements, in general, require the other party to comply with OFAC Requirements. If a tenant or other party with whom we contract is placed on the OFAC list we may be required by the OFAC Requirements to terminate the lease or other agreement. Any such termination could result in a loss of revenue or a damage claim by the other party that the termination was wrongful.

We face possible risks associated with the physical effects of climate change.

We cannot assert with certainty whether climate change is occurring and, if so, at what rate. However, the physical effects of climate change could have a material adverse effect on our properties, operations and business. For example, many of our properties are located along the East and West coasts, particularly those in the Central Business Districts of Boston, New York, and San Francisco. To the extent climate change causes changes in weather patterns, our markets could experience increases in storm intensity and rising sea-levels. Over time, these conditions could result in declining demand for office space in our buildings or our inability to operate the buildings at all. Climate change may also have indirect effects on our business by increasing the cost of (or making unavailable) property insurance on terms we find acceptable, increasing the cost of energy and increasing the cost of snow removal at our properties. There can be no assurance that climate change will not have a material adverse effect on our properties, operations or business.

Potential liability for environmental contamination could result in substantial costs.

Under federal, state and local environmental laws, ordinances and regulations, we may be required to investigate and clean up the effects of releases of hazardous or toxic substances or petroleum products at our properties simply because of our current or past ownership or operation of the real estate. If unidentified environmental problems arise, we may have to make substantial payments, which could adversely affect our cash flow and our ability to make distributions to our securityholders, because: as owner or operator we may have to pay for property damage and for investigation and clean-up costs incurred in connection with the contamination; the law typically imposes clean-up responsibility and liability regardless of whether the owner or operator knew of or caused the contamination; even if more than one person may be responsible for the contamination, each

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person who shares legal liability under the environmental laws may be held responsible for all of the clean-up costs; and governmental entities and third parties may sue the owner or operator of a contaminated site for damages and costs.

These costs could be substantial and in extreme cases could exceed the amount of our insurance or the value of the contaminated property. We currently carry environmental insurance in an amount and subject to deductibles that we believe are commercially reasonable. Specifically, we carry a pollution legal liability policy with a $20 million limit per incident and a policy aggregate limit of $40 million. The presence of hazardous or toxic substances or petroleum products or the failure to properly remediate contamination may materially and adversely affect our ability to borrow against, sell or rent an affected property. In addition, applicable environmental laws create liens on contaminated sites in favor of the government for damages and costs it incurs in connection with contamination. Changes in laws, regulations and practices and their implementation increasing the potential liability for environmental conditions existing at our properties, or increasing the restrictions on the handling, storage or discharge of hazardous or toxic substances or petroleum products or other actions may result in significant unanticipated expenditures.

Environmental laws also govern the presence, maintenance and removal of asbestos and other building materials. For example, laws require that owners or operators of buildings containing asbestos:

• properly manage and maintain the asbestos;

• notify and train those who may come into contact with asbestos; and

• undertake special precautions, including removal or other abatement, if asbestos would be disturbed during renovation or demolition of a building.

Such laws may impose fines and penalties on building owners or operators who fail to comply with these requirements and may allow third parties to seek recovery from owners or operators for personal injury associated with exposure to asbestos fibers.

Some of our properties are located in urban and previously developed areas where fill or current or historic industrial uses of the areas have caused site contamination. It is our policy to retain independent environmental consultants to conduct or update Phase I environmental site assessments and asbestos surveys with respect to our acquisition of properties. These assessments generally include a visual inspection of the properties and the surrounding areas, an examination of current and historical uses of the properties and the surrounding areas and a review of relevant state, federal and historical documents, but do not involve invasive techniques such as soil and ground water sampling. Where appropriate, on a property-by-property basis, our practice is to have these consultants conduct additional testing, including sampling for asbestos, for lead and other contaminants in drinking water and, for soil and/or groundwater contamination where underground storage tanks are or were located or where other past site usage creates a potential environmental problem. Even though these environmental assessments are conducted, there is still the risk that:

• the environmental assessments and updates did not identify all potential environmental liabilities;

• a prior owner created a material environmental condition that is not known to us or the independent consultants preparing the assessments;

• new environmental liabilities have developed since the environmental assessments were conducted; and

• future uses or conditions such as changes in applicable environmental laws and regulations could result in environmental liability for us.

Inquiries about indoor air quality may necessitate special investigation and, depending on the results, remediation beyond our regular indoor air quality testing and maintenance programs. Indoor air quality issues can stem from inadequate ventilation, chemical contaminants from indoor or outdoor sources, and biological

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contaminants such as molds, pollen, viruses and bacteria. Indoor exposure to chemical or biological contaminants above certain levels can be alleged to be connected to allergic reactions or other health effects and symptoms in susceptible individuals. If these conditions were to occur at one of our properties, we may be subject to third-party claims for personal injury, or may need to undertake a targeted remediation program, including without limitation, steps to increase indoor ventilation rates and eliminate sources of contaminants. Such remediation programs could be costly, necessitate the temporary relocation of some or all of the property’s tenants or require rehabilitation of the affected property.

We face risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems.

We face risks associated with security breaches, whether through cyber attacks or cyber intrusions over the Internet, malware, computer viruses, attachments to e-mails, persons inside our organization or persons with access to systems inside our organization, and other significant disruptions of our IT networks and related systems. The risk of a security breach or disruption, particularly through cyber attack or cyber intrusion, including by computer hackers, foreign governments and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and intrusions from around the world have increased. Our IT networks and related systems are essential to the operation of our business and our ability to perform day-to-day operations (including managing our building systems) and, in some cases, may be critical to the operations of certain of our tenants. Although we make efforts to maintain the security and integrity of these types of IT networks and related systems, and we have implemented various measures to manage the risk of a security breach or disruption, there can be no assurance that our security efforts and measures will be effective or that attempted security breaches or disruptions would not be successful or damaging. Even the most well protected information, networks, systems and facilities remain potentially vulnerable because the techniques used in such attempted security breaches evolve and generally are not recognized until launched against a target, and in some cases are designed not be detected and, in fact, may not be detected. Accordingly, we may be unable to anticipate these techniques or to implement adequate security barriers or other preventative measures, and thus it is impossible for us to entirely mitigate this risk.

A security breach or other significant disruption involving our IT networks and related systems could:

• disrupt the proper functioning of our networks and systems and therefore our operations and/or those of certain of our tenants;

• result in misstated financial reports, violations of loan covenants, missed reporting deadlines and/or missed permitting deadlines;

• result in our inability to properly monitor our compliance with the rules and regulations regarding our qualification as a REIT;

• result in the unauthorized access to, and destruction, loss, theft, misappropriation or release of, proprietary, confidential, sensitive or otherwise valuable information of ours or others, which others could use to compete against us or for disruptive, destructive or otherwise harmful purposes and outcomes;

• result in our inability to maintain the building systems relied upon by our tenants for the efficient use of their leased space;

• require significant management attention and resources to remedy any damages that result;

• subject us to claims for breach of contract, damages, credits, penalties or termination of leases or other agreements; or

• damage our reputation among our tenants and investors generally.

Any or all of the foregoing could have a material adverse effect on our results of operations, financial condition and cash flows.

37

We did not obtain new owner’s title insurance policies in connection with properties acquired during our initial public offering.

We acquired many of our properties from our predecessors at the completion of our initial public offering in June 1997. Before we acquired these properties, each of them was insured by a title insurance policy. We did not obtain new owner’s title insurance policies in connection with the acquisition of these properties. To the extent we have financed properties after acquiring them in connection with the initial public offering, we have obtained new title insurance policies, however, the amount of these policies may be less than the current or future value of the applicable properties. Nevertheless, because in many instances we acquired these properties indirectly by acquiring ownership of the entity that owned the property and those owners remain in existence as our subsidiaries, some of these title insurance policies may continue to benefit us. Many of these title insurance policies may be for amounts less than the current or future values of the applicable properties. If there was a title defect related to any of these properties, or to any of the properties acquired at the time of our initial public offering, that is no longer covered by a title insurance policy, we could lose both our capital invested in and our anticipated profits from such property. We have obtained title insurance policies for all properties that we have acquired after our initial public offering, however, these policies may be for amounts less than the current or future values of the applicable properties.

Because of the ownership structure of our hotel property, we face potential adverse effects from changes to the applicable tax laws.

We own one hotel property. However, under the Internal Revenue Code, REITs like us are not allowed to operate hotels directly or indirectly. Accordingly, we lease our hotel property to one of our taxable REIT subsidiaries. As lessor, we are entitled to a percentage of the gross receipts from the operation of the hotel property. Marriott International, Inc. manages the hotel under the Marriott name pursuant to a management contract with the taxable REIT subsidiary as lessee. While the taxable REIT subsidiary structure allows the economic benefits of ownership to flow to us, the taxable REIT subsidiary is subject to tax on its income from the operations of the hotel at the federal and state level. In addition, the taxable REIT subsidiary is subject to detailed tax regulations that affect how it may be capitalized and operated. If the tax laws applicable to taxable REIT subsidiaries are modified, we may be forced to modify the structure for owning our hotel property, and such changes may adversely affect the cash flows from our hotel. In addition, the Internal Revenue Service, the United States Treasury Department and Congress frequently review federal income tax legislation, and we cannot predict whether, when or to what extent new federal tax laws, regulations, interpretations or rulings will be adopted. Any of such actions may prospectively or retroactively modify the tax treatment of the taxable REIT subsidiary and, therefore, may adversely affect our after-tax returns from our hotel property.

We face possible adverse changes in tax laws.

From time to time changes in state and local tax laws or regulations are enacted, which may result in an increase in our tax liability. A shortfall in tax revenues for states and municipalities in which we operate may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional taxes on our assets or income. These increased tax costs could adversely affect our financial condition and results of operations and the amount of cash available for the payment of dividends.

We face possible state and local tax audits.

Because we are organized and qualify as a REIT, we are generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which we own real estate either have undergone, or are currently undergoing, tax audits. Although we believe that we have substantial arguments in favor of our positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on our results of operations.

38

Changes in accounting pronouncements could adversely affect our operating results, in addition to the reported financial performance of our tenants.

Accounting policies and methods are fundamental to how we record and report our financial condition and results of operations. Uncertainties posed by various initiatives of accounting standard-setting by the Financial Accounting Standards Board and the Securities and Exchange Commission, which create and interpret applicable accounting standards for U.S. companies, may change the financial accounting and reporting standards or their interpretation and application of these standards that govern the preparation of our financial statements. Proposed changes include, but are not limited to, changes in lease accounting and the adoption of accounting standards likely to require the increased use of “fair-value” measures.

These changes could have a material impact on our reported financial condition and results of operations. In some cases, we could be required to apply a new or revised standard retroactively, resulting in potentially material restatements of prior period financial statements. Similarly, these changes could have a material impact on our tenants’ reported financial condition or results of operations or could affect our tenants’ preferences regarding leasing real estate.

Item 1B. Unresolved Staff Comments

None.

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Item 2. Properties.

At December 31, 2013, we owned or had interests in 175 properties, totaling approximately 44.4 million net rentable square feet, including nine properties under construction totaling approximately 2.9 million net rentable square feet. In addition, we had structured parking for approximately 45,234 vehicles containing approximately 15.4 million square feet. Our properties consisted of (1) 167 office properties, including 128 Class A office buildings, including eight properties under construction, and 39 properties that support both office and technical uses, (2) four retail properties, (3) one hotel and (4) three residential properties (one of which is under construction). In addition, we own or control 503.6 acres of land for future development. The table set forth below shows information relating to the properties we owned, or in which we had an ownership interest, at December 31, 2013.

Properties	Location	% Leased as of December 31, 2013			Number of Buildings		Net Rentable Square Feet
Class A Office
767 Fifth Avenue (The General Motors Building) (60% ownership)	New York, NY		98.7	%		1		1,806,957
John Hancock Tower	Boston, MA		95.9	%		1		1,722,629
399 Park Avenue	New York, NY		99.0	%		1		1,710,383
601 Lexington Avenue	New York, NY		99.8	%		1		1,631,300
100 Federal Street	Boston, MA		94.6	%		1		1,265,399
Times Square Tower (55% ownership)	New York, NY		100.0	%		1		1,245,823
800 Boylston Street—The Prudential Center	Boston, MA		98.5	%		1		1,228,651
599 Lexington Avenue	New York, NY		99.2	%		1		1,045,128
Bay Colony Corporate Center	Waltham, MA		76.4	%		4		992,042
Embarcadero Center Four	San Francisco, CA		90.5	%		1		934,377
111 Huntington Avenue—The Prudential Center	Boston, MA		98.2	%		1		858,326
Embarcadero Center One	San Francisco, CA		96.3	%		1		833,438
Atlantic Wharf Office	Boston, MA		100.0	%		1		793,827
Embarcadero Center Two	San Francisco, CA		98.2	%		1		779,768
Embarcadero Center Three	San Francisco, CA		97.4	%		1		775,086
Capital Gallery	Washington, DC		92.5	%		1		631,165
South of Market	Reston, VA		100.0	%		3		623,665
Metropolitan Square (51% ownership) (1)	Washington, DC		90.6	%		1		588,917
3200 Zanker Road	San Jose, CA		49.9	%		4		543,900
901 New York Avenue (25% ownership) (1)	Washington, DC		99.9	%		1		539,679
Reservoir Place	Waltham, MA		85.2	%		1		527,860
One and Two Patriots Park	Reston, VA		100.0	%		2		523,482
Fountain Square (50% ownership)	Reston, VA		98.4	%		2		521,628
601 and 651 Gateway	South San Francisco, CA		99.2	%		2		506,277
101 Huntington Avenue—The Prudential Center	Boston, MA		99.2	%		1		505,389
2200 Pennsylvania Avenue	Washington, DC		98.1	%		1		458,831
One Freedom Square	Reston, VA		98.8	%		1		432,831
Two Freedom Square	Reston, VA		100.0	%		1		421,142
One Tower Center	East Brunswick, NJ		37.3	%		1		414,648

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Properties	Location	% Leased as of December 31, 2013			Number of Buildings		Net Rentable Square Feet
Market Square North (50% ownership) (1)	Washington, DC		87.9	%		1		407,607
140 Kendrick Street	Needham, MA		95.6	%		3		380,987
One and Two Discovery Square	Reston, VA		93.8	%		2		366,990
Weston Corporate Center	Weston, MA		100.0	%		1		356,995
510 Madison Avenue	New York, NY		68.2	%		1		355,598
505 9th Street, N.W. (50% ownership)	Washington, DC		100.0	%		1		321,943
One Reston Overlook	Reston, VA		100.0	%		1		319,519
1333 New Hampshire Avenue	Washington, DC		91.8	%		1		315,371
Waltham Weston Corporate Center	Waltham, MA		99.1	%		1		306,687
230 CityPoint	Waltham, MA		74.1	%		1		301,373
Wisconsin Place Office	Chevy Chase, MD		100.0	%		1		299,186
540 Madison Avenue (60% ownership) (1)	New York, NY		75.8	%		1		294,345
Quorum Office Park	Chelmsford, MA		90.0	%		2		267,527
Five Cambridge Center	Cambridge, MA		100.0	%		1		263,450
Reston Corporate Center	Reston, VA		100.0	%		2		261,046
Democracy Tower	Reston, VA		100.0	%		1		259,441
611 Gateway	South San Francisco, CA		81.0	%		1		257,664
New Dominion Technology Park—Building Two	Herndon, VA		100.0	%		1		257,400
200 West Street	Waltham, MA		87.9	%		1		256,245
1330 Connecticut Avenue	Washington, DC		100.0	%		1		252,136
500 E Street, S. W.	Washington, DC		100.0	%		1		248,336
New Dominion Technology Park—Building One	Herndon, VA		100.0	%		1		235,201
510 Carnegie Center	Princeton, NJ		100.0	%		1		234,160
500 North Capitol (30% ownership) (1)	Washington, DC		85.0	%		1		231,411
Four Cambridge Center	Cambridge, MA		100.0	%		1		216,156
One Cambridge Center	Cambridge, MA		100.0	%		1		215,629
77 CityPoint	Waltham, MA		100.0	%		1		209,707
Sumner Square	Washington, DC		97.3	%		1		208,892
University Place	Cambridge, MA		100.0	%		1		195,282
Seventeen Cambridge Center	Cambridge, MA		100.0	%		1		195,191
North First Business Park (2)	San Jose, CA		100.0	%		5		190,636
Three Patriots Park	Reston, VA		100.0	%		1		182,423
2600 Tower Oaks Boulevard	Rockville, MD		70.7	%		1		179,369
Eight Cambridge Center	Cambridge, MA		100.0	%		1		177,226
Lexington Office Park	Lexington, MA		94.5	%		2		166,759
210 Carnegie Center	Princeton, NJ		79.3	%		1		162,372
206 Carnegie Center	Princeton, NJ		100.0	%		1		161,763
191 Spring Street	Lexington, MA		100.0	%		1		158,900
Kingstowne Two	Alexandria, VA		73.0	%		1		156,251
Ten Cambridge Center	Cambridge, MA		100.0	%		1		152,664
212 Carnegie Center	Princeton, NJ		79.5	%		1		152,576
Kingstowne One	Alexandria, VA		83.5	%		1		151,483
214 Carnegie Center	Princeton, NJ		67.1	%		1		150,774
506 Carnegie Center	Princeton, NJ		100.0	%		1		149,110
2440 West El Camino Real	Mountain View, CA		100.0	%		1		140,042

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Properties	Location	% Leased as of December 31, 2013			Number of Buildings		Net Rentable Square Feet
Two Reston Overlook	Reston, VA		100.0	%		1		134,615
508 Carnegie Center	Princeton, NJ		69.4	%		1		133,915
202 Carnegie Center	Princeton, NJ		97.4	%		1		130,582
101 Carnegie Center	Princeton, NJ		84.0	%		1		125,269
502 Carnegie Center	Princeton, NJ		83.3	%		1		122,460
504 Carnegie Center	Princeton, NJ		100.0	%		1		121,990
40 Shattuck Road	Andover, MA		87.7	%		1		121,216
91 Hartwell Avenue	Lexington, MA		63.6	%		1		120,458
701 Carnegie Center	Princeton, NJ		100.0	%		1		120,000
Annapolis Junction Building Six (50% ownership) (1)	Annapolis, MD		48.9	%		1		119,339
Annapolis Junction (50% ownership) (1)	Annapolis, MD		91.6	%		1		117,599
Three Cambridge Center	Cambridge, MA		100.0	%		1		115,061
201 Spring Street	Lexington, MA		100.0	%		1		106,300
104 Carnegie Center	Princeton, NJ		90.2	%		1		102,886
33 Hayden Avenue	Lexington, MA		64.3	%		1		80,128
Eleven Cambridge Center	Cambridge, MA		100.0	%		1		79,616
Reservoir Place North	Waltham, MA		100.0	%		1		73,258
105 Carnegie Center	Princeton, NJ		62.7	%		1		69,955
32 Hartwell Avenue	Lexington, MA		100.0	%		1		69,154
302 Carnegie Center	Princeton, NJ		96.1	%		1		64,926
195 West Street	Waltham, MA		100.0	%		1		63,500
100 Hayden Avenue	Lexington, MA		100.0	%		1		55,924
181 Spring Street	Lexington, MA		100.0	%		1		55,793
211 Carnegie Center	Princeton, NJ		100.0	%		1		47,025
92 Hayden Avenue	Lexington, MA		100.0	%		1		31,100
201 Carnegie Center	Princeton, NJ		100.0	%		—		6,500
Subtotal for Class A Office Properties			93.7	%		120		37,974,940
Retail
Shops at The Prudential Center	Boston, MA		100.0	%		1		501,357
Fountain Square Retail (50% ownership)	Reston, VA		100.0	%		1		234,339
Kingstowne Retail	Alexandria, VA		100.0	%		1		88,288
Shaws Supermarket at The Prudential Center	Boston, MA		100.0	%		1		57,235
Subtotal for Retail Properties			100.0	%		4		881,219
Office/Technical Properties
Mountain View Research Park	Mountain View, CA		83.5	%		16		603,564
Seven Cambridge Center	Cambridge, MA		100.0	%		1		231,028
Mountain View Technology Park	Mountain View, CA		100.0	%		7		135,279
7601 Boston Boulevard	Springfield, VA		100.0	%		1		103,750
7435 Boston Boulevard	Springfield, VA		100.0	%		1		103,557
8000 Grainger Court	Springfield, VA		100.0	%		1		88,775
7500 Boston Boulevard	Springfield, VA		100.0	%		1		79,971
7501 Boston Boulevard	Springfield, VA		100.0	%		1		75,756
Fourteen Cambridge Center	Cambridge, MA		100.0	%		1		67,362
164 Lexington Road	Billerica, MA		0.0	%		1		64,140
7450 Boston Boulevard	Springfield, VA		100.0	%		1		62,402

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Properties	Location	% Leased as of December 31, 2013			Number of Buildings		Net Rentable Square Feet
7374 Boston Boulevard	Springfield, VA		100.0	%		1		57,321
8000 Corporate Court	Springfield, VA		0.0	%		1		52,539
7451 Boston Boulevard	Springfield, VA		34.9	%		1		45,615
7300 Boston Boulevard	Springfield, VA		100.0	%		1		32,000
17 Hartwell Avenue	Lexington, MA		0.0	%		1		30,000
453 Ravendale Avenue	Mountain View, CA		100.0	%		1		29,620
7375 Boston Boulevard	Springfield, VA		100.0	%		1		26,865
Subtotal for Office/Technical Properties			85.4	%		39		1,889,544
Residential Properties
Residences on The Avenue (335 units)	Washington, DC		95.0	%(3)		1		323,050	(4)
The Lofts at Atlantic Wharf (86 units)	Boston, MA		98.5	%(3)		1		87,097	(5)
Subtotal for Residential Properties			95.7	%		2		410,147
Hotel Property
Cambridge Center Marriott (433 rooms)	Cambridge, MA		75.3	%(6)		1		334,260	(7)
Subtotal for Hotel Property			75.3	%		1		334,260
Subtotal for In-Service Properties			93.4	%		166		41,490,110
Structured Parking (45,234 spaces)								15,440,948
Properties Under Construction (8)
Office:
Annapolis Junction Building Seven (50% ownership) (1)	Annapolis, MD		100	%		1		125,000
680 Folsom Street (9)	San Francisco, CA		96	%		2		524,509
250 West 55th Street (10)	New York, NY		61	%		1		989,000
804 Carnegie Center	Princeton, NJ		100	%		1		130,000
535 Mission Street	San Francisco, CA		0	%		1		307,000
601 Massachusetts Avenue	Washington, DC		79	%		1		478,000
Transbay Tower (95% ownership) (11)	San Francisco, CA		N/A			1		N/A
Residential:
The Avant at Reston Town Center (359 units) (12)	Reston, VA		21	%		1		355,327	(13)
Subtotal for Properties Under Construction			63	%		9		2,908,836
Total Portfolio						175		59,839,894

(1) Property is an unconsolidated joint venture.

(2) Property held for redevelopment as of December 31, 2013.

(3) Represents the Average Physical Occupancy as of December 31, 2013. Average Physical Occupancy is defined as the average number of occupied units during the fourth quarter of 2013 divided by the total number of units, expressed as a percentage. Note that these amounts are not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2013.

(4) Includes 49,528 square feet of retail space which is 100% leased as of December 31, 2013. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2013.

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(5) Includes 9,617 square feet of retail space which is 100% leased as of December 31, 2013. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2013.

(6) Represents the weighted-average room occupancy for the year ended December 31, 2013. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2013.

(7) Includes 4,260 square feet of retail space which is 100% leased of December 31, 2013. Note that this amount is not included in the calculation of the Total Portfolio occupancy rate for In-Service Properties as of December 31, 2013.

(8) Represents percentage leased as of February 21, 2014.

(9) As of February 21, 2014 this property was 1% placed in-service.

(10) As of February 21, 2014 this property was 6% placed in-service.

(11) This project could support a 60-story, 1.4 million square foot office tower, however it currently only has approval to be built to grade.

(12) As of February 21, 2014 this property was fully placed in-service (Refer to Footnote 20 of the Consolidated Financial Statements).

(13) Includes 26,179 square feet of retail space which is 100% leased as of December 31, 2013.

Percentage Leased and Average Annualized Revenue per Square Foot for In-Service Properties

The following table sets forth our percentage leased and average annualized revenue per square foot on a historical basis for our In-Service Properties.

	December 31, 2009			December 31, 2010			December 31, 2011			December 31, 2012			December 31, 2013
Percentage leased		92.4	%		93.2	%		91.3	%		91.4	%		93.4	%
Average annualized revenue per square foot(1)	$	52.84		$	53.21		$	53.58		$	55.43		$	56.36

(1) Represents the monthly contractual base rents and recoveries from tenants under existing leases as of December 31, 2009, 2010, 2011, 2012 and 2013 multiplied by twelve. These annualized amounts are before rent abatements and include expense reimbursements, which may be estimates as of such date. The aggregate amount of rent abatements per square foot under existing leases as of December 31, 2009, 2010, 2011, 2012 and 2013 for the succeeding twelve month period is $0.96, $1.11, $1.10, $1.17 and $0.58, respectively.

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Top 20 Tenants by Square Feet

Our 20 largest tenants by square feet as of December 31, 2013 were as follows:

	Tenant	Square Feet			% of In-Service Portfolio
1	U.S. Government		2,423,424	(1)		5.95	%
2	Citibank		1,018,432	(2)		2.50	%
3	Bank of America		867,030	(3)		2.13	%
4	Biogen		772,212			1.90	%
5	Wellington Management		707,568			1.74	%
6	Kirkland & Ellis		639,683	(4)		1.57	%
7	Genentech		568,097			1.39	%
8	Ropes & Gray		528,931			1.30	%
9	O’Melveny & Myers		504,902			1.24	%
10	Weil Gotshal Manges		490,065	(5)		1.20	%
11	Shearman & Sterling		472,808			1.16	%
12	Manufactures Investment (ManuLife)		440,974			1.08	%
13	State Street Bank and Trust		408,552			1.00	%
14	Finnegan Henderson Farabow		362,405	(6)		0.89	%
15	Microsoft		359,859			0.88	%
16	Ann Inc. (fka Ann Taylor Corp.)		351,026			0.86	%
17	Parametric Technology		320,655			0.79	%
18	Google		306,386			0.75	%
19	Mass Financial Services		301,668			0.74	%
20	Bingham McCutchen		301,385			0.74	%

(1) Includes 92,620 and 104,874 square feet of space in properties in which we have a 51% and 50% interest, respectively.

(2) Includes 10,080 and 2,761 square feet of space in properties in which we have a 60% and 51% interest, respectively.

(3) Includes 50,887 square feet of space in a property in which we have a 60% interest.

(4) Includes 248,021 square feet of space in a property in which we have a 51% interest.

(5) Includes 449,871 square feet of space in a property in which we have a 60% interest.

(6) Includes 292,548 square feet of space in a property in which we have a 25% interest.

Tenant Diversification (Gross Rent)

Our tenant diversification as of December 31, 2013 was as follows:

Sector	Percentage of Gross Rent
Legal Services		25	%
Financial Services—all other		16	%
Financial Services—commercial and investment banking		12	%
Technical and Scientific Services		12	%
Other Professional Services		7	%
Retail		7	%
Government / Public Administration		5	%
Manufacturing / Consumer Products		5	%
Other		4	%
Real Estate and Insurance		4	%
Media / Telecommunications		3	%

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Lease Expirations (1)(2) 

Year of Lease Expiration	Rentable Square Feet Subject to Expiring Leases		Current Annualized Contractual Rent Under Expiring Leases Without Future Step-Ups(3)		Current Annualized Contractual Rent Under Expiring Leases Without Future Step-Ups p.s.f.(3)		Current Annualized Contractual Rent Under Expiring Leases With Future Step-Ups(4)		Current Annualized Contractual Rent Under Expiring Leases With Future Step-Ups p.s.f.(4)		Percentage of Total  Square Feet
2014		2,540,562	$	118,726,987	$	46.73	$	119,505,067	$	47.04		6.2	%
2015		2,936,829		153,984,971		52.43		155,587,846		52.98		7.2	%
2016		3,248,649		162,740,370		50.09		166,813,872		51.35		8.0	%
2017		4,220,059		282,602,966		66.97		289,133,131		68.51		10.4	%
2018		1,877,474		116,800,109		62.21		122,282,936		65.13		4.6	%
2019		4,095,650		222,751,651		54.39		237,400,238		57.96		10.1	%
2020		3,463,210		207,424,504		59.89		225,469,867		65.10		8.5	%
2021		2,389,732		127,804,161		53.48		143,518,208		60.06		5.9	%
2022		4,053,888		224,975,114		55.50		250,776,512		61.86		10.0	%
Thereafter		8,753,899		500,425,443		57.17		595,601,122		68.04		21.5	%

(1) Includes 100% of unconsolidated joint venture properties. Does not include residential units and the hotel.

(2) Does not include data for leases expiring in a particular year when leases for the same space have already been signed with replacement tenants with future commencement dates. In those cases, the data is included in the year in which the future lease with the replacement tenant expires.

(3) Represents the monthly contractual base rent and recoveries from tenants under existing leases as of December 31, 2013 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.

(4) Represents the monthly contractual base rent under expiring leases with future contractual increases upon expiration and recoveries from tenants under existing leases as of December 31, 2013 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.

Item 3. Legal Proceedings

We are subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on our financial position, results of operations or liquidity.

Item 4. Mine Safety Disclosures

Not Applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

(a) Our common stock is listed on the New York Stock Exchange under the symbol “BXP.” The high and low sales prices and dividends for the periods indicated in the table below were:

Quarter Ended	High		Low		Dividends per common share
December 31, 2013	$	109.83	$	98.04	$	2.90	(1)
September 30, 2013		112.93		98.21		0.65
June 30, 2013		115.85		99.59		0.65
March 31, 2013		109.65		99.85		0.65
December 31, 2012		111.56		99.23		0.65
September 30, 2012		117.00		107.52		0.55
June 30, 2012		110.17		98.92		0.55
March 31, 2012		107.87		96.73		0.55

(1) Paid on January 29, 2014 to stockholders of record as of the close of business on December 31, 2013. Amount includes a $2.25 per common share special dividend.

At February 21, 2014, we had approximately 1,444 stockholders of record.

In order to maintain our qualification as a REIT, we must make annual distributions to our stockholders of at least 90% of our taxable income (not including net capital gains). We have adopted a policy of paying regular quarterly distributions on our common stock, and we have adopted a policy of paying regular quarterly distributions on the common units of BPLP. Cash distributions have been paid on our common stock and BPLP’s common units since our initial public offering. Distributions are declared at the discretion of the Board of Directors and depend on actual and anticipated cash from operations, our financial condition, capital requirements, the annual distribution requirements under the REIT provisions of the Internal Revenue Code and other factors the Board of Directors may consider relevant.

During the three months ended December 31, 2013, we issued an aggregate of 592,506 common shares in exchange for 592,506 common units of limited partnership held by certain limited partners of BPLP. Of these shares, 586,831 (of which 432,914 shares had been issued in exchange for common units issued by BPLP upon conversion of 329,880 Series Two Preferred Units) were issued in reliance on an exemption from registration under Section 4(2) of the Securities Act of 1933, as amended. We relied on the exemption under Section 4(2) based upon factual representations received from the limited partners who received the common shares.

Stock Performance Graph

The following graph provides a comparison of cumulative total stockholder return for the period from December 31, 2008 through December 31, 2013, among Boston Properties, the Standard & Poor’s (“S&P”) 500 Index, the National Association of Real Estate Investment Trusts, Inc. (“NAREIT”) Equity REIT Total Return Index (the “Equity REIT Index”) and the NAREIT Office REIT Index (the “Office REIT Index”). The Equity REIT Index includes all tax-qualified equity REITs listed on the New York Stock Exchange, the American Stock Exchange and the NASDAQ Stock Market. Equity REITs are defined as those with 75% or more of their gross invested book value of assets invested directly or indirectly in the equity ownership of real estate. The Office REIT Index includes all office REITs included in the Equity REIT Index. Data for Boston Properties, the S&P 500 Index, the Equity REIT Index and the Office REIT Index was provided to us by NAREIT. Upon written request, Boston Properties will provide any stockholder with a list of the REITs included in the Equity REIT

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Index and the Office REIT Index. The stock performance graph assumes an investment of $100 in each of Boston Properties and the three indices, and the reinvestment of any dividends. The historical information set forth below is not necessarily indicative of future performance. The data shown is based on the share prices or index values, as applicable, at the end of each month shown.

	As of the year ended December 31,
	2008		2009		2010		2011		2012		2013
Boston Properties	$	100.00	$	127.52	$	167.82	$	198.28	$	215.25	$	214.06
S&P 500	$	100.00	$	126.46	$	145.51	$	148.59	$	172.37	$	228.19
Equity REIT Index	$	100.00	$	127.99	$	163.76	$	177.32	$	212.26	$	218.32
Office REIT Index	$	100.00	$	135.55	$	160.50	$	159.28	$	181.82	$	191.96

(b) None.

(c) Issuer Purchases of Equity Securities. No repurchases during the fourth quarter.

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Item 6. Selected Financial Data

The following table sets forth our selected financial and operating data on a historical basis. Certain prior year amounts have been reclassified to conform to the current year presentation and have been revised for the reclassifications related to the disposition of qualifying properties during 2013 which have been reclassified as discontinued operations, for the periods presented, in accordance with the guidance in ASC 360 “Property, Plant and Equipment” (“ASC 360”). We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. These expenses, which totaled approximately $8.1 million, $7.7 million, $7.5 million, $8.1 million and $8.1 million for the years ended December 31, 2013, 2012, 2011, 2010 and 2009, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented. The following data should be read in conjunction with our financial statements and notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations included elsewhere in this Form 10-K.

Our historical operating results may not be comparable to our future operating results.

	For the year ended December 31,
	2013			2012			2011			2010			2009
	(in thousands, except per share data)
Statement of Operations Information:
Total revenue	$	2,135,539		$	1,847,186		$	1,722,792		$	1,515,420		$	1,488,683
Expenses:
Rental operating		742,956			639,088			572,668			479,879			480,273
Hotel operating		28,447			28,120			26,128			25,153			23,966
General and administrative		115,329			90,129			87,101			87,459			83,512
Transaction costs		1,744			3,653			1,987			2,876			—
Impairment loss		8,306			—			—			—			—
Suspension of development		—			—			—			(7,200	)		27,766
Depreciation and amortization		560,637			445,875			429,742			329,749			313,444
Total expenses		1,457,419			1,206,865			1,117,626			917,916			928,961
Operating income		678,120			640,321			605,166			597,504			559,722
Other income (expense):
Income from unconsolidated joint ventures		75,074			49,078			85,896			36,774			12,058
Gains on consolidation of joint ventures		385,991			—			—			—			—
Interest and other income		8,310			10,091			5,358			7,332			4,050
Gains (losses) from investments in securities		2,911			1,389			(443	)		935			2,434
Interest expense		(446,880	)		(410,970	)		(391,533	)		(375,403	)		(318,989	)
Gains (losses) from early extinguishments of debt		122			(4,453	)		(1,494	)		(89,670	)		(494	)
Income from continuing operations		703,648			285,456			302,950			177,472			258,781
Gains on sales of real estate		—			—			—			2,734			11,760
Discontinued operations		137,792			46,683			10,876			10,121			3,958
Net income		841,440			332,139			313,826			190,327			274,499
Net income attributable to noncontrolling interests		(91,629	)		(42,489	)		(41,147	)		(31,255	)		(43,485	)
Net income attributable to Boston Properties, Inc.		749,811			289,650			272,679			159,072			231,014
Preferred dividends		(8,057	)		—			—			—			—
Net income attributable to Boston Properties, Inc. common shareholders	$	741,754		$	289,650		$	272,679		$	159,072		$	231,014
Basic earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations	$	4.06		$	1.65		$	1.80		$	1.08		$	1.73
Discontinued operations		0.81			0.28			0.07			0.06			0.03
Net income	$	4.87		$	1.93		$	1.87		$	1.14		$	1.76
Weighted average number of common shares outstanding		152,201			150,120			145,693			139,440			131,050
Diluted earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations	$	4.05		$	1.64		$	1.80		$	1.08		$	1.73
Discontinued operations		0.81			0.28			0.01			0.06			0.03
Net income	$	4.86		$	1.92		$	1.81		$	1.14		$	1.76
Weighted average number of common and common equivalent shares outstanding		152,521			150,711			146,218			140,057			131,512

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	December 31,
	2013			2012			2011			2010			2009
	(in thousands)
Balance Sheet information:
Real estate, gross	$	18,978,765		$	14,893,328		$	13,389,472		$	12,764,935		$	11,099,558
Real estate, net		15,817,194			11,959,168			10,746,486			10,441,117			9,065,881
Cash and cash equivalents		2,365,137			1,041,978			1,823,208			478,948			1,448,933
Total assets		20,162,251			15,462,321			14,782,966			13,348,263			12,348,703
Total indebtedness		11,341,508			8,912,369			8,704,138			7,786,001			6,719,771
Noncontrolling interests		150,921			208,434			55,652			55,652			55,652
Stockholders’ equity attributable to Boston Properties, Inc.		5,741,153			5,097,065			4,865,998			4,372,643			4,446,002
Equity noncontrolling interests		1,302,465			537,789			547,518			591,550			623,057
	For the year ended December 31,
	2013			2012			2011			2010			2009
	(in thousands, except per share and percentage data)
Other Information:
Funds from Operations attributable to Boston Properties, Inc. (1)	$	751,464		$	741,419		$	710,991		$	547,356		$	618,006
Dividends declared per share (2)		4.85			2.30			2.05			2.00			2.18
Cash flows provided by operating activities		777,926			642,949			606,328			375,893			617,376
Cash flows used in investing activities		(532,640	)		(1,278,032	)		(90,096	)		(1,161,274	)		(446,601	)
Cash flows provided by (used in) financing activities		1,077,873			(146,147	)		828,028			(184,604	)		1,036,648
Total square feet at end of year (including development projects and parking)		59,840			60,275			57,259			53,557			50,468
In-service percentage leased at end of year		93.4	%		91.4	%		91.3	%		93.2	%		92.4	%

(1) Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of NAREIT, we calculate Funds from Operations, or FFO, by adjusting net income (loss) attributable to Boston Properties, Inc. (computed in accordance with GAAP, including non-recurring items) for gains (or losses) from sales of properties, impairment losses on depreciable real estate of consolidated real estate, impairment losses on investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures, real estate related depreciation and amortization, and after adjustment for unconsolidated partnerships, joint ventures and preferred distributions. FFO is a non-GAAP financial measure. The use of FFO, combined with the required primary GAAP presentations, has been fundamentally beneficial in improving the understanding of operating results of REITs among the investing public and making comparisons of REIT operating results more meaningful. Management generally considers FFO to be a useful measure for reviewing our comparative operating and financial performance because, by excluding gains and losses related to sales of previously depreciated operating real estate assets, impairment losses on depreciable real estate of consolidated real estate, impairment losses on investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures and excluding real estate asset depreciation and amortization (which can vary among owners of identical assets in similar condition based on historical cost accounting and useful life estimates), FFO can help one compare the operating performance of a company’s real estate between periods or as compared to different companies. Our computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently. Amount represents our share, which was 89.99%, 89.48%, 88.57%, 87.25% and 86.57% for the years ended December 31, 2013, 2012, 2011, 2010 and 2009, respectively, after allocation to the noncontrolling interests.

FFO should not be considered as an alternative to net income attributable to Boston Properties, Inc. (determined in accordance with GAAP) as an indication of our performance. FFO does not represent cash generated from operating activities determined in accordance with GAAP and is not a measure of liquidity or an indicator of our ability to make cash distributions. We believe that to further understand our performance, FFO should be compared with our reported net income attributable to Boston Properties, Inc. and considered in addition to cash flows in accordance with GAAP, as presented in our Consolidated Financial Statements.

A reconciliation of FFO to net income attributable to Boston Properties, Inc. computed in accordance with GAAP is provided under the heading of “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Funds from Operations.”

(2) Includes the special dividend of $2.25 per share paid on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013.

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Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report.

Forward-Looking Statements

This Annual Report on Form 10-K, including the documents incorporated by reference, contains forward-looking statements within the meaning of the federal securities laws, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 and are including this statement for purposes of complying with those safe harbor provisions. Such statements are contained principally, but not only, under the captions “Business—Business and Growth Strategies,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” We caution investors that any such forward-looking statements are based on beliefs and on assumptions made by, and information currently available to, our management. When used, the words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “project,” “result,” “should,” “will” and similar expressions which do not relate solely to historical matters are intended to identify forward-looking statements. Such statements are subject to risks, uncertainties and assumptions and are not guarantees of future performance, which may be affected by known and unknown risks, trends, uncertainties and factors that are beyond our control. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated, estimated or projected by the forward-looking statements. We caution you that, while forward-looking statements reflect our good faith beliefs when we make them, they are not guarantees of future performance and are impacted by actual events when they occur after we make such statements. Accordingly, investors should use caution in relying on forward-looking statements, which are based on results and trends at the time they are made, to anticipate future results or trends.

Some of the risks and uncertainties that may cause our actual results, performance or achievements to differ materially from those expressed or implied by forward-looking statements include, among others, the following:

• the continuing impacts of high unemployment and other macroeconomic trends, which are having and may continue to have a negative effect on the following, among other things:

• the fundamentals of our business, including overall market occupancy, tenant space utilization, and rental rates;

• the financial condition of our tenants, many of which are financial, legal and other professional firms, our lenders, counterparties to our derivative financial instruments and institutions that hold our cash balances and short-term investments, which may expose us to increased risks of default by these parties; and

• the value of our real estate assets, which may limit our ability to dispose of assets at attractive prices or obtain or maintain debt financing secured by our properties or on an unsecured basis;

• general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, tenant space utilization, dependence on tenants’ financial condition, and competition from other developers, owners and operators of real estate);

• failure to manage effectively our growth and expansion into new markets and sub-markets or to integrate acquisitions and developments successfully;

• the ability of our joint venture partners to satisfy their obligations;

• risks and uncertainties affecting property development and construction (including, without limitation, construction delays, cost overruns, inability to obtain necessary permits and public opposition to such activities);

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• risks associated with the availability and terms of financing and the use of debt to fund acquisitions and developments, including the impact of higher interest rates on the cost and/or availability of financing;

• risks associated with forward interest rate contracts and the effectiveness of such arrangements;

• risks associated with downturns in the national and local economies, increases in interest rates, and volatility in the securities markets;

• risks associated with actual or threatened terrorist attacks;

• costs of compliance with the Americans with Disabilities Act and other similar laws;

• potential liability for uninsured losses and environmental contamination;

• risks associated with our potential failure to qualify as a REIT under the Internal Revenue Code of 1986, as amended;

• possible adverse changes in tax and environmental laws;

• the impact of newly adopted accounting principles on our accounting policies and on period-to-period comparisons of financial results;

• risks associated with possible state and local tax audits; and

• risks associated with our dependence on key personnel whose continued service is not guaranteed.

The risks set forth above are not exhaustive. Other sections of this report, including “Part I, Item 1A—Risk Factors,” include additional factors that could adversely affect our business and financial performance. Moreover, we operate in a very competitive and rapidly changing environment. New risk factors emerge from time to time and it is not possible for management to predict all risk factors, nor can we assess the impact of all risk factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. Given these risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results. Investors should also refer to our Quarterly Reports on Form 10-Q for future periods and Current Reports on Form 8-K as we file them with the SEC, and to other materials we may furnish to the public from time to time through Current Reports on Form 8-K or otherwise, for a discussion of risks and uncertainties that may cause actual results, performance or achievements to differ materially from those expressed or implied by forward-looking statements. We expressly disclaim any responsibility to update any forward-looking statements to reflect changes in underlying assumptions or factors, new information, future events, or otherwise, and you should not rely upon these forward-looking statements after the date of this report.

Overview

We are a fully integrated self-administered and self-managed REIT and one of the largest owners and developers of Class A office properties in the United States. Our properties have been concentrated in five markets—Boston, New York, Princeton, San Francisco and Washington, DC. Beginning in fiscal 2014, Princeton will be reflected as the suburban component of the New York region. We generate revenue and cash primarily by leasing Class A office space to our tenants. Factors we consider when we lease space include the creditworthiness of the tenant, the length of the lease, the rental rate to be paid at inception and throughout the lease term, the costs of tenant improvements and other landlord concessions, current and anticipated operating costs and real estate taxes, our current and anticipated vacancy, current and anticipated future demand for office space and general economic factors. From time to time, we also generate cash through the sale of assets.

Our core strategy has always been to own, operate and develop properties in supply-constrained markets with high barriers to entry and to focus on executing long-term leases with financially strong tenants. Historically, this combination has tended to reduce our exposure in down cycles and enhance revenues as market conditions improve. To be successful in the current leasing environment, we believe all aspects of the tenant-landlord relationship must be considered. In this regard, we believe that our understanding of tenants’ short- and

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long-term space utilization and amenity needs in the local markets in which we operate, our relationships with local brokers, our reputation as a premier owner and operator of Class A office properties, our financial strength and our ability to maintain high building standards provide us with a competitive advantage. We expect tenants in our markets to continue to take advantage of the ability to upgrade to high-quality space in Class A properties like ours, particularly those tenants who value our operational expertise and financial stability when making their leasing decisions.

Leasing activity has continued to improve in our submarkets in which demand is driven primarily by growth in the technology and life sciences industries. This is particularly true in the San Francisco Central Business District (“CBD”), Silicon Valley, Cambridge, Massachusetts and suburban Boston submarkets, and we remain optimistic about the long-term operating fundamentals in all of our markets. Our portfolio is concentrated in markets and submarkets where businesses are oriented on new ideas, such as technology, advertising, media and information distribution (often referred to as “TAMI”), mobility, life sciences and medical devices, and these segments of the economy are expanding and leasing additional office space. However, there continue to be headwinds against more rapid improvements in the overall office business. The strongest force is densification, which occurs as businesses seek less traditional layouts that cater to more collaborative work environments and fit people more efficiently into less space. We are also seeing moderate levels of new construction in our markets accommodating both growing tenant sectors and tenants seeking more efficient space utilization, and the resulting increase in supply presents challenges for increasing our occupancy and the rents we can realize.

Leasing activity in our portfolio during 2013 was consistent with recent years as we signed approximately 5.1 million square feet of leases covering vacant space, extensions and expansions and pre-leasing for our development projects. This total was in line with our annual average of approximately 5.1 million square feet over the past five years. Our activity has resulted in significant improvement in our portfolio occupancy of 200 basis points in 2013 from 91.4% at December 31, 2012 to 93.4% at December 31, 2013.

In the midtown Manhattan market, overall leasing activity in 2013 remained strong for tenants seeking between 5,000 and 25,000 square feet, and we completed approximately 600,000 square feet of leasing in 58 lease transactions. Activity in our portfolio has improved with same store occupancy increasing by 330 basis points from the end of 2012 to approximately 96.6% as of December 31, 2013, with little near-term lease expirations. The increase in demand in our portfolio is driven by smaller tenants, primarily in the financial services industry. We also experienced activity from larger tenants and during 2013 we signed a 96,000 square foot lease with an established financial tenant at our 250 West 55th Street development project with projected revenue beginning in early 2015. As of December 31, 2013, 250 West 55th Street has been partially placed in-service and is currently 61% leased. We expect to commence revenue recognition on a significant portion of the signed leases in the second half of 2014. We are also negotiating leases with four tenants totaling approximately 175,000 square feet and, if these leases are signed, the building will be approximately 76% leased. We do not expect these leases under negotiation, if signed, to begin revenue recognition until early 2015. At 510 Madison Avenue and 540 Madison Avenue our space leased has improved to 80% and 85%, respectively, with approximately 159,000 square feet of new leases signed during 2013 in 25 separate transactions.

In our Washington, DC region, the overall leasing activity continues to be slow and public sector and defense contractor demand has been adversely impacted by continued federal budgetary uncertainty, sequestration and the reductions in discretionary spending programs. Our near-term exposure in the Washington, DC CBD is limited due to our strong occupancy rate of 94.6%. In addition, with positive absorption in our suburban Washington, DC assets, particularly in Reston, Virginia, occupancy in our Washington region portfolio improved from approximately 94.3% at the end of 2012 to approximately 95.0% at December 31, 2013, with moderate rollover/exposure through 2014 of approximately 7.8%. We are actively engaging our law firm tenants with future lease expirations to provide new space configuration in exchange for extended lease terms at market rents. This may result in us reducing the amount of space the tenant leases, therefore reducing near-term revenue, but providing for more stable long-term revenues.

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In the Boston region, the expansion of the life sciences and technology industry is positively impacting each of the submarkets in which we operate. Our assets in the Boston CBD are approximately 98.0% leased. We have been actively leasing space to cover our 2014-2015 lease expirations at the John Hancock Tower and the Prudential Center and have signed approximately 817,000 square feet of new leases, early renewals and relocations. However, the positive rental impact from approximately 568,000 square feet will not be realized until 2015 because (1) a portion of these leases are with existing sublease tenants and therefore higher rents will not commence until the new direct lease takes effect and (2) other tenants do not take occupancy until 2015. The East Cambridge submarket is the strongest submarket in the region. Our Cambridge portfolio is 100% leased with approximately 77,000 square feet expiring through 2014. Although we have no vacant space to lease, we are negotiating early renewals with tenants in Cambridge that we expect will increase our rental revenues from these spaces in future years. In the suburbs of Boston along the Route 128 corridor, we are also benefiting from the strong tenant demand in the technology and life sciences industries with the completion of approximately 803,000 square feet of leases since the end of 2012. Specifically, at our Bay Colony Corporate Center we have signed leases or have leases under negotiation that, if consummated, would increase our occupancy from approximately 76.4%, as of December 31, 2013, to approximately 89.5%. In total, our suburban portfolio occupancy improved 790 basis points since the beginning of 2013 to 86.3%.

The San Francisco CBD and Silicon Valley submarkets continue to benefit from business expansion and job growth, particularly in the technology sector, which has resulted in positive absorption, lower vacancy and increasing rental rates. Our assets in San Francisco CBD and the Silicon Valley submarkets are approximately 89.9% leased. During 2013 we leased approximately 1.1 million square feet, including an approximately 428,000 square foot renewal at our Gateway complex and an approximately 56,000 square foot lease at 50 Hawthorne Street. Our 680 Folsom Street/50 Hawthorne Street development project is now approximately 96% pre-leased with delivery expected in mid 2014. Construction of 535 Mission Street is on schedule and we expect to be able to deliver space to tenants in the second half of 2014 with revenue commencing in 2015. In addition, we have commenced the construction of below grade and foundation work for the Transbay Tower, a 1.4 million square foot project located in the heart of San Francisco’s South Financial submarket. These activities will be completed in early 2015 and, prior to completing these activities, we expect to determine whether to proceed to complete vertical construction.

At Carnegie Center in Princeton, New Jersey, we continue to gain occupancy, extend leases and expand our portfolio with build-to-suit opportunities. During 2013, we completed approximately 541,000 square feet of leases with existing, new or expanding tenants that will improve our occupancy from approximately 84.5%, as of December 31, 2012, to a projected average of approximately 90% in 2014. In addition, we signed a 15-year lease with NRG Energy, Inc. for an approximately 130,000 net rentable square foot build-to-suit that we expect to deliver in 2016.

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The table below details the leasing activity during the three and twelve months ended December 31, 2013:

	Three Months Ended December 31, 2013			Twelve Months Ended December 31, 2013
	Total Square Feet
Vacant space available at the beginning of the period		2,973,975			3,501,253
Property dispositions/properties taken out of service		(30,077	)		(139,354	)
Properties acquired vacant space		—			86,661
Properties placed in-service		4,100			616,783
Leases expiring or terminated during the period		547,336			2,877,334
Total space available for lease		3,495,334			6,942,677
1st generation leases		68,450			648,942
2nd generation leases with new tenants		548,660			2,398,202
2nd generation lease renewals		194,577			1,211,886
Total space leased		811,687			4,259,030
Vacant space available for lease at the end of the period		2,683,647			2,683,647
Second generation leasing information: (1)
Leases commencing during the period, in square feet		743,237			3,610,088
Average Lease Term		76 Months			81 Months
Average Free Rent Period		79 Days			76 Days
Total Transaction Costs Per Square Foot (2)	$	37.85		$	36.58
Increase / (decrease) in Gross Rents (3)		1.30	%		(1.08	)%
Increase / (decrease) in Net Rents (4)		2.11	%		(2.29	)%

(1) Second generation leases are defined as leases for space that had previously been under lease by us. Of the 743,237 and 3,610,088 square feet of second generation leases that commenced during the three and twelve months ended December 31, 2013, respectively, 514,202 and 2,208,099 square feet were signed in prior periods for the three and twelve months ended December 31, 2013, respectively.

(2) Total transaction costs include tenant improvements and leasing commissions and exclude free rent concessions.

(3) Represents the increase/(decrease) in gross rent (base rent plus expense reimbursements) on the new vs. expired leases on the 407,680 and 2,462,953 square feet of second generation leases (1) that had been occupied within the prior 12 months and (2) for which the new lease term is greater than six months, for the three and twelve months ended December 31, 2013, respectively.

(4) Represents the increase/(decrease) in net rent (gross rent less operating expenses) on the new vs. expired leases on the 407,680 and 2,462,953 square feet of second generation leases (1) that had been occupied within the prior 12 months and (2) for which the new lease term is greater than six months, for the three and twelve months ended December 31, 2013, respectively.

From January 1, 2014 to December 31, 2014, leases representing approximately 6.2% of the space at our properties expire. As these leases expire, assuming no change in current market rental rates, we expect that the rental rates we are likely to achieve on new leases will generally be greater than the rates that are currently being paid.

Although we continue to evaluate opportunities to acquire assets, the abundance of capital and demand for assets has resulted in increasing prices. As a result, in the current environment we are able to develop properties at a cost per square foot that is generally less than the cost at which we can acquire older existing properties, thereby generating relatively better returns with lower annual maintenance expenses and capital costs. Accordingly, we believe the successful lease-up and completion of our development pipeline will enhance our long-term return on equity and earnings growth as these developments are placed in-service through 2016.

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During the twelve months ended December 31, 2013, we fully placed in-service Two Patriots Park in Reston, Virginia, 500 North Capitol Street in Washington, DC, Annapolis Junction Building Six in Annapolis, Maryland, Seventeen Cambridge Center in Cambridge, Massachusetts, and the Cambridge Center Connector in Cambridge, Massachusetts. In addition, during 2013, we partially placed in-service 250 West 55th Street in New York City, 680 Folsom Street in San Francisco and The Avant, our residential project in Reston, Virginia. We believe the development of well-positioned office buildings is justified in many of our submarkets where tenants have shown demand for high-quality construction, modern design, efficient floor plates and sustainable features. In addition, select first-class residential developments that are part of a mixed-use environment, which combine office, retail and residential uses, have proven successful in our markets. Each of our development projects underway is pre-certified USGB LEED Silver or higher. As of December 31, 2013, our current development pipeline, which excludes properties which are fully placed in-service, totals approximately 2.9 million square feet with a total projected investment of approximately $2.5 billion. Additionally, we are working on several new developments in each of our markets that could commence in 2015 or later.

Given investor demand for assets like ours we also continue to review our portfolio to identify properties that may have limited opportunities for cash flow growth, no longer fit within our portfolio strategy or can attract premium pricing in the current market environment as potential sales candidates. During 2013 we sold approximately $1.25 billion (our share) of assets, including:

• a 45% ownership interest in our Times Square Tower property in New York City for a gross sale price of approximately $684 million,

• 125 West 55th Street in New York City, which was owned by a joint venture in which we had a 60% interest, for approximately $470 million, of which our share is approximately $282.0 million,

• an assemblage of land parcels and air-rights at Eighth Avenue and 46th Street in New York City, which were owned by a joint venture in which we had a 50% interest, for an imputed sale price of approximately $45 million, of which our share is approximately $22.5 million,

• 303 Almaden Boulevard in San Jose, California for approximately $40 million,

• 1301 New York Avenue in Washington, DC for approximately $135 million,

• 10 & 20 Burlington Mall Road in Burlington, Massachusetts for approximately $30 million, and

• One Preserve Parkway in Rockville, Maryland for approximately $61 million.

In general, we structure asset sales for possible inclusion in like kind exchanges within the meaning of Section 1031 of the Internal Revenue Code. The ability to complete a like kind exchange depends on many factors, including, among others, identifying and acquiring suitable replacement property within limited time periods and the ownership structure of the property being sold, and therefore we are not always able to sell an asset as part of a like kind exchange. When successful, however, like kind exchanges enable us to defer the taxable gain on the asset sold and thus preserve capital. Primarily as a result of our 2013 asset sales program, we declared a special dividend of $2.25 per share of common stock to holders of record as of December 31, 2013 that was paid on January 29, 2014. We are considering the sale of all or a portion of additional properties and if we are unable to identify and acquire suitable replacement property in a like kind exchange, then we expect to distribute at least the amount of proceeds necessary to avoid paying a corporate level tax on the gain realized from the sale.

After repaying $747.5 million of our Operating Partnership’s 3.625% exchangeable senior notes on February 18, 2014, we maintain substantial liquidity including available cash, as of February 21, 2014, of approximately $0.9 billion and approximately $989.4 million available under our Operating Partnership’s $1.0 billion Unsecured Line of Credit. Our more significant future funding requirements include $0.7 billion of our development pipeline that remains to be funded through 2017 and approximately $77 million of secured debt (of which our share is approximately $70 million) that matures by the end of 2014. We have access to multiple

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sources of capital, including current cash balances, public debt and equity markets, secured and unsecured debt markets and potential asset sales to fund our future capital requirements.

For descriptions of significant transactions that we completed during 2013, see “Item 1. Business—Transactions During 2013.”

Critical Accounting Policies

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP, requires management to use judgment in the application of accounting policies, including making estimates and assumptions. We base our estimates on historical experience and on various other assumptions believed to be reasonable under the circumstances. These judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different, it is possible that different accounting policies would have been applied resulting in a different presentation of our financial statements. From time to time, we evaluate our estimates and assumptions. In the event estimates or assumptions prove to be different from actual results, adjustments are made in subsequent periods to reflect more current information. Below is a discussion of accounting policies that we consider critical in that they may require complex judgment in their application or require estimates about matters that are inherently uncertain.

Real Estate

Upon acquisitions of real estate that constitutes a business, which includes the consolidation of previously unconsolidated joint ventures,, we assess the fair value of acquired tangible and intangible assets, (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities) and allocate the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. We assess and consider fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that we deem appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions.

The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. We also consider an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenants’ credit quality and expectations of lease renewals. Based on our acquisitions to date, our allocation to customer relationship intangible assets has been immaterial.

We record acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below- market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in our Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on our evaluation of the specific characteristics of each tenant’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, we consider leasing commissions, legal and other related expenses.

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Management reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of its assets is not recoverable and exceeds its fair value. If such criteria are present, an impairment loss is recognized based on the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If our strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If we determine that an impairment has occurred, the affected assets must be reduced to their fair value, less cost to sell.

Guidance in Accounting Standards Codification (“ASC”) 360 “Property Plant and Equipment” (“ASC 360”) requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and we will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). We generally consider assets to be “held for sale” when the transaction has been approved by our Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that a sale of the property within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. We expense costs that we incur to effect a business combination such as legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involves a degree of judgment. Our capitalization policy on development properties is guided by guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate—General.” The costs of land and buildings under development include specifically identifiable costs.

The capitalized costs include pre-construction costs necessary to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We begin the capitalization of costs during the pre-construction period which we define as activities that are necessary to the development of the property. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. We cease capitalization on the portion (1) substantially completed, (2) occupied or held available for occupancy, and we capitalize only those costs associated with the portion under construction or (3) if activities necessary for the development of the property have been suspended.

Investments in Unconsolidated Joint Ventures

We consolidate variable interest entities (VIEs) in which we are considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have a controlling

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financial interest. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance, and (2) the obligation to absorb losses and right to receive the returns from the variable interest entity that would be significant to the variable interest entity. For ventures that are not VIEs we consolidate entities for which we have significant decision making control over the ventures’ operations. Our judgment with respect to our level of influence or control of an entity involves the consideration of various factors including the form of our ownership interest, our representation in the entity’s governance, the size of our investment (including loans), estimates of future cash flows, our ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace us as manager and/or liquidate the venture, if applicable. Our assessment of our influence or control over an entity affects the presentation of these investments in our consolidated financial statements. In addition to evaluating control rights, we consolidate entities in which the outside partner has no substantive kick-out rights to remove us as the managing member.

Accounts of the consolidated entity are included in our accounts and the non-controlling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, our net equity investment is reflected within the Consolidated Balance Sheets, and our share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, our recognition of joint venture income or loss generally follows the joint venture’s distribution priorities, which may change upon the achievement of certain investment return thresholds. We may account for cash distributions in excess of our investment in an unconsolidated joint venture as income when we are not the general partner in a limited partnership and when we have neither the requirement nor the intent to provide financial support to the joint venture. Our investments in unconsolidated joint ventures are reviewed for impairment periodically and we record impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying values has occurred and such decline is other-than-temporary. The ultimate realization of the investment in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market conditions. We will record an impairment charge if we determine that a decline in the value below the carrying value of an investment in an unconsolidated joint venture is other-than-temporary.

To the extent that we contribute assets to a joint venture, our investment in the joint venture is recorded at our cost basis in the assets that were contributed to the joint venture. To the extent that our cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in our share of equity in net income of the joint venture. In accordance with the provisions of ASC 970-323 “Investments-Equity Method and Joint Ventures” (“ASC 970-323”), we will recognize gains on the contribution of real estate to joint ventures, relating solely to the outside partner’s interest, to the extent the economic substance of the transaction is a sale.

The combined summarized financial information of the unconsolidated joint ventures is disclosed in Note 5 to the Consolidated Financial Statements.

Revenue Recognition

Contractual rental revenue is reported on a straight-line basis over the terms of our respective leases. We recognize rental revenue of acquired in-place “above-” and “below-market” leases at their fair values over the terms of the respective leases. Accrued rental income as reported on the Consolidated Balance Sheets represents rental income recognized in excess of rent payments actually received pursuant to the terms of the individual lease agreements.

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For the year ended December 31, 2013, the impact of the net adjustments of rents from “above-” and “below-market” leases increased rental revenue by approximately $28.0 million. For the year ended December 31, 2013, the impact of the straight-line rent adjustment increased rental revenue by approximately $65.8 million. Those amounts exclude the adjustment of rents from “above-” and “below-market” leases and straight-line income from unconsolidated joint ventures, which are disclosed in Note 5 to the Consolidated Financial Statements.

Our leasing strategy is generally to secure creditworthy tenants that meet our underwriting guidelines. Furthermore, following the initiation of a lease, we continue to actively monitor the tenant’s creditworthiness to ensure that all tenant related assets are recorded at their realizable value. When assessing tenant credit quality, we:

• review relevant financial information, including:

• financial ratios;

• net worth;

• revenue;

• cash flows;

• leverage; and

• liquidity;

• evaluate the depth and experience of the tenant’s management team; and

• assess the strength/growth of the tenant’s industry.

As a result of the underwriting process, tenants are then categorized into one of three categories:

(1) low risk tenants;

(2) the tenant’s credit is such that we require collateral, in which case we:

• require a security deposit; and/or

• reduce upfront tenant improvement investments; or

(3) the tenant’s credit is below our acceptable parameters.

We consistently monitor the credit quality of our tenant base. We provide an allowance for doubtful accounts arising from estimated losses that could result from the tenant’s inability to make required current rent payments and an allowance against accrued rental income for future potential losses that we deem to be unrecoverable over the term of the lease.

Tenant receivables are assigned a credit rating of 1 through 4. A rating of 1 represents the highest possible rating and no allowance is recorded. A rating of 4 represents the lowest credit rating, in which case we record a full reserve against the receivable balance. Among the factors considered in determining the credit rating include:

• payment history;

• credit status and change in status (credit ratings for public companies are used as a primary metric);

• change in tenant space needs (i.e., expansion/downsize);

• tenant financial performance;

• economic conditions in a specific geographic region; and

• industry specific credit considerations.

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If our estimates of collectability differ from the cash received, the timing and amount of our reported revenue could be impacted. The average remaining term of our in-place tenant leases, including unconsolidated joint ventures, was approximately 6.6 years as of December 31, 2013. The credit risk is mitigated by the high quality of our existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of our portfolio to identify potential problem tenants.

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred. Tenant reimbursements are recognized and presented in accordance with guidance in ASC 605-45 “Principal Agent Considerations” (“ASC 605-45”). ASC 605-45 requires that these reimbursements be recorded on a gross basis, as we are generally the primary obligor with respect to purchasing goods and services from third-party suppliers, have discretion in selecting the supplier and have credit risk. We also receive reimbursement of payroll and payroll related costs from third parties which we reflect on a net basis.

Our parking revenues are derived from leases, monthly parking and transient parking. We recognize parking revenue as earned.

Our hotel revenues are derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenues are recognized as earned.

We receive management and development fees from third parties. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. We review each development agreement and record development fees as earned depending on the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third-party partners’ ownership interest.

Gains on sales of real estate are recognized pursuant to the provisions included in ASC 360-20 “Real Estate Sales” (“ASC 360-20”). The specific timing of the sale is measured against various criteria in ASC 360-20 related to the terms of the transaction and any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, we defer some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Depreciation and Amortization

We compute depreciation and amortization on our properties using the straight-line method based on estimated useful asset lives. We allocate the acquisition cost of real estate to its components and depreciate or amortize these assets over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, marketable securities, escrows, receivables, accounts payable, accrued expenses and other assets and liabilities are reasonable estimates of their fair values because of the short maturities of these instruments.

We follow the authoritative guidance for fair value measurements when valuing our financial instruments for disclosure purposes. We determine the fair value of our unsecured senior notes and unsecured exchangeable

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senior notes using market prices. The inputs used in determining the fair value of our unsecured senior notes and unsecured exchangeable senior notes is categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that we use quoted market rates to value these instruments. However, the inputs used in determining the fair value could be categorized at a level 2 basis if trading volumes are low. We determine the fair value of our mortgage notes payable using discounted cash flow analyses by discounting the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt based on current market rates for similar securities. In determining the current market rates, we add our estimates of market spreads to the quoted yields on federal government treasury securities with similar maturity dates to our debt. The inputs used in determining the fair value of our mortgage notes payable and mezzanine notes payable are categorized at a level 3 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that we consider the rates used in the valuation techniques to be unobservable inputs.

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the Consolidated Balance Sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. We account for the effective portion of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassify the effective portion to earnings over the term that the hedged transaction affects earnings. We account for the ineffective portion of changes in the fair value of a derivative directly in earnings.

Results of Operations

The following discussion is based on our Consolidated Statement of Operations for the years ended December 31, 2013, 2012 and 2011.

At December 31, 2013, 2012 and 2011, we owned or had interests in a portfolio of 175, 157 and 153 properties, respectively (in each case, the “Total Property Portfolio”). As a result of changes within our Total Property Portfolio, the financial data presented below shows significant changes in revenue and expenses from period-to-period. Accordingly, we do not believe that our period-to-period financial data with respect to the Total Property Portfolio are necessarily meaningful. Therefore, the comparison of operating results for the years ended December 31, 2013, 2012 and 2011 show separately the changes attributable to the properties that were owned by us and in service throughout each period compared (the “Same Property Portfolio”) and the changes attributable to the properties included in the Placed In-Service, Acquired or Consolidated or Development or Redevelopment Portfolios.

In our analysis of operating results, particularly to make comparisons of net operating income between periods meaningful, it is important to provide information for properties that were in-service and owned by us throughout each period presented. We refer to properties acquired or consolidated or placed in-service prior to the beginning of the earliest period presented and owned by us and in service through the end of the latest period presented as our Same Property Portfolio. The Same Property Portfolio therefore excludes properties placed in-service, acquired or consolidated, repositioned or in development or redevelopment after the beginning of the earliest period presented or disposed of prior to the end of the latest period presented.

Net operating income, or NOI, is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc., the most directly comparable GAAP financial measure, plus income attributable to noncontrolling interests, discontinued operations, depreciation and amortization, interest expense, impairment loss, transaction costs, general and administrative expense, less gains (losses) from early extinguishments of debt,

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gains (losses) from investments in securities, gains on consolidation of joint ventures, income from unconsolidated joint ventures, interest and other income and development and management services revenue. We use NOI internally as a performance measure and believe NOI provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. Therefore, we believe NOI is a useful measure for evaluating the operating performance of our real estate assets.

Our management also uses NOI to evaluate regional property level performance and to make decisions about resource allocations. Further, we believe NOI is useful to investors as a performance measure because, when compared across periods, NOI reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspectives not immediately apparent from net income attributable to Boston Properties, Inc. NOI excludes certain components from net income attributable to Boston Properties, Inc. in order to provide results that are more closely related to a property’s results of operations. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. In addition, depreciation and amortization, because of historical cost accounting and useful life estimates, may distort operating performance at the property level. NOI presented by us may not be comparable to NOI reported by other REITs that define NOI differently. We believe that in order to facilitate a clear understanding of our operating results, NOI should be examined in conjunction with net income attributable to Boston Properties, Inc. as presented in our Consolidated Financial Statements. NOI should not be considered as an alternative to net income attributable to Boston Properties, Inc. as an indication of our performance or to cash flows as a measure of liquidity or ability to make distributions. For a reconciliation of NOI to net income attributable to Boston Properties, Inc., see Note 14 to the Consolidated Financial Statements.

Comparison of the year ended December 31, 2013 to the year ended December 31, 2012

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 126 properties totaling approximately 33.5 million net rentable square feet of space, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or consolidated or placed in-service on or prior to January 1, 2012 and owned and in service through December 31, 2013. The Total Property Portfolio includes the effects of the other properties either placed in-service, acquired or consolidated or in development or redevelopment after January 1, 2012 or disposed of on or prior to December 31, 2013. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the year ended December 31, 2013 and 2012 with respect to the properties which were placed in-service, acquired or consolidated or in development or redevelopment.

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	Same Property Portfolio										Properties Acquired or Consolidated Portfolio				Properties Placed In-Service Portfolio				Properties in  Development or Redevelopment Portfolio						Total Property Portfolio
(dollars in thousands)	2013		2012		Increase/ (Decrease)			% Change			2013		2012		2013		2012		2013			2012			2013			2012			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	1,704,584	$	1,650,516	$	54,068			3.28	%	$	289,905	$	61,692	$	43,807	$	25,141	$	2,248		$	7,098		$	2,040,544		$	1,744,447		$	296,097			16.97	%
Termination Income		2,399		7,625		(5,226	)		(68.54	)%		—		—		408		2,571		—			—			2,807			10,196			(7,389	)		(72.47	)%
Total Rental Revenue		1,706,983		1,658,141		48,842			2.95	%		289,905		61,692		44,215		27,712		2,248			7,098			2,043,351			1,754,643			288,708			16.45	%
Real Estate Operating Expenses		618,119		593,976		24,143			4.06	%		99,284		25,378		13,362		7,604		421			1,138			731,186			628,096			103,090			16.41	%
Net Operating Income, excluding residential and hotel		1,088,864		1,064,165		24,699			2.32	%		190,621		36,314		30,853		20,108		1,827			5,960			1,312,165			1,126,547			185,618			16.48	%
Residential Net Operating Income(1)		10,393		9,576		817			8.53	%		—		—		—		—		—			—			10,393			9,576			817			8.53	%
Hotel Net Operating Income(1)		11,883		9,795		2,088			21.32	%		—		—		—		—		—			—			11,883			9,795			2,088			21.32	%
Consolidated Net Operating Income(1)		1,111,140		1,083,536		27,604			2.55	%		190,621		36,314		30,853		20,108		1,827			5,960			1,334,441			1,145,918			188,523			16.45	%
Other Revenue:
Development and management services		—		—		—			—			—		—		—		—		—			—			29,695			34,060			(4,365	)		(12.82	)%
Other Expenses:
General and administrative expense		—		—		—			—			—		—		—		—		—			—			115,329			90,129			25,200			27.96	%
Transaction costs		—		—		—			—			—		—		—		—		—			—			1,744			3,653			(1,909	)		(52.26	)%
Impairment loss		—		—		—			—			—		—		—		—		—			—			8,306			—			8,306			100.00	%
Depreciation and amortization		405,355		401,833		3,522			0.88	%		135,236		27,310		15,467		10,598		4,579			6,134			560,637			445,875			114,762			25.74	%
Total Other Expenses		405,355		401,833		3,522			0.88	%		135,236		27,310		15,467		10,598		4,579			6,134			686,016			539,657			146,359			27.12	%
Operating Income		705,785		681,703		24,082			3.53	%		55,385		9,004		15,386		9,510		(2,752	)		(174	)		678,120			640,321			37,799			5.90	%
Other Income:
Income from unconsolidated joint ventures																										75,074			49,078			25,996			52.97	%
Gains on consolidation of joint ventures																										385,991			—			385,991			100.00	%
Interest and other income																										8,310			10,091			(1,781	)		(17.65	)%
Gains from investments in securities																										2,911			1,389			1,522			109.58	%
Gains (losses) from early extinguishments of debt																										122			(4,453	)		4,575			102.74	%
Other Expenses:
Interest expense																										446,880			410,970			35,910			8.74	%
Income from continuing operations																										703,648			285,456			418,192			146.50	%
Discontinued operations:
Income from discontinued operations																										8,022			9,806			(1,784	)		(18.19	)%
Gains on sales of real estate from discontinued operations																										112,829			36,877			75,952			205.96	%
Gain on forgiveness of debt from discontinued operations																										20,182			—			20,182			100.00	%
Impairment loss from discontinued operations																										(3,241	)		—			(3,241	)		(100.00	)%
Net income																										841,440			332,139			509,301			153.34	%
Net income attributable to noncontrolling interests:
Noncontrolling interests in property partnerships																										(1,347	)		(3,792	)		2,445			64.48	%
Noncontrolling interest—redeemable preferred units of the Operating Partnership																										(6,046	)		(3,497	)		(2,549	)		(72.89	)%
Noncontrolling interest—common units of the Operating Partnership																										(70,085	)		(30,125	)		(39,960	)		(132.65	)%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																										(14,151	)		(5,075	)		(9,076	)		(178.84	)%
Net income attributable to Boston Properties, Inc.																									$	749,811		$	289,650		$	460,161			158.87	%
Preferred dividends																										(8,057	)		—			(8,057	)		(100.00	)%
Net income attributable to Boston Properties, Inc. common shareholders																									$	741,754		$	289,650		$	452,104			156.09	%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 62. Residential Net Operating Income for the year ended December 31, 2013 and 2012 are comprised of Residential Revenue of $22,163 and $20,568 less Residential Expenses of $11,770 and $10,992, respectively. Hotel Net Operating Income for the year ended December 31, 2013 and 2012 are comprised of Hotel Revenue of $40,330 and $37,915 less Hotel Expenses of $28,447 and $28,120, respectively, per the Consolidated Statements of Operations.

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Same Property Portfolio

Rental Revenue

Rental revenue from the Same Property Portfolio increased approximately $54.1 million for the year ended December 31, 2013 compared to 2012. The increase was primarily the result of an increase of approximately $46.9 million in rental revenue from our leases and increases in parking and other recoveries of approximately $4.9 million and $3.2 million, respectively, partially offset by a decrease in other income of approximately $0.9 million. The increase in parking was primarily related to transient parking. The increase in rental revenue from our leases of approximately $46.9 million was the result of our average revenue increasing by approximately $0.97 per square foot, contributing approximately $29.5 million, and an approximately $17.4 million increase due to an increase in average occupancy from 91.4% to 92.3%.

For 2014, we expect continued improvement in our occupancy to result in an increase in Same Property Portfolio net operating income of approximately 1.25% to 2.5% compared to 2013. We are expecting occupancy to average between 92.5% to 93.5% for 2014.

Termination Income

Termination income decreased by approximately $5.2 million for the year ended December 31, 2013 compared to 2012.

Termination income for the year ended December 31, 2013 related to twenty-two tenants across the Same Property Portfolio and totaled approximately $2.4 million, of which approximately $1.0 million was negotiated termination income from one of our Reston, Virginia properties in order to accommodate growth of an existing tenant.

Termination income for the year ended December 31, 2012 related to twenty-eight tenants across the Same Property Portfolio and totaled approximately $7.6 million of which approximately $3.6 million was from the settlement of a bankruptcy claim against a former tenant that rejected our lease in 2009 and approximately $0.9 million was a negotiated termination from one of our Reston, Virginia properties in order to accommodate growth of an existing tenant.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $24.1 million for the year ended December 31, 2013 compared to 2012 due primarily to (1) an increase of approximately $13.9 million, or 5.3%, in real estate taxes, which increases primarily occurred in our Boston and New York regions, (2) an increase of approximately $4.9 million, or 5.3%, in utilities expense, that was primarily due to an increase in the delivery rate for steam in the Boston region, (3) an increase of approximately $5.3 million, or 5.8%, in property repairs and maintenance expense and (4) an increase of approximately $3.2 million, or 2.3%, in other operating expenses. This was partially offset by an approximately $3.2 million cumulative non-cash straight-line adjustment for ground rent expense that occurred in 2012 and did not recur in 2013.

We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. These expenses, which totaled approximately $8.1 million and $7.7 million for the year ended December 31, 2013 and 2012, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

Depreciation and Amortization Expense

Depreciation and amortization expense for the Same Property Portfolio increased approximately $3.5 million, or 0.9%, for the year ended December 31, 2013 compared to 2012.

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Properties Acquired or Consolidated Portfolio

On March 1, 2012, we acquired 453 Ravendale Drive located in Mountain View, California for a purchase price of approximately $6.7 million in cash. 453 Ravendale Drive is an approximately 30,000 net rentable square foot Office/Technical property.

On March 13, 2012, we acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash. In connection with the transaction, we entered into a long-term lease with an affiliate of Bank of America for approximately 732,000 square feet. 100 Federal Street is an approximately 1,265,000 net rentable square foot, 37-story Class A office tower.

On October 4, 2012, we completed the formation of a joint venture which owns and operates Fountain Square located in Reston, Virginia, adjacent to our other Reston properties. Fountain Square is an office and retail complex aggregating approximately 756,000 net rentable square feet, comprised of approximately 522,000 net rentable square feet of Class A office space and approximately 234,000 net rentable square feet of retail space. We own 50% of, and are consolidating, the joint venture.

On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from the Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and account for them on a consolidated basis. Mountain View Research Park is an approximately 604,000 net rentable square foot, sixteen building Office/Technical complex. Mountain View Technology Park is an approximately 135,000 net rentable square foot, seven building Office/Technical complex.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial statements instead of under the equity method of accounting. Our ownership interest in 767 Venture, LLC remained unchanged at 60%. 767 Fifth Avenue (the General Motors Building) is an approximately 1.8 million net rentable square foot, 59-story Class A office tower.

Rental Revenue

Rental revenue from our Properties Acquired or Consolidated Portfolio increased approximately $228.2 million for the year ended December 31, 2013 compared to 2012, as detailed below:

Property	Date Acquired	Rental Revenue for the year ended December 31,
		2013		2012		Change
		(in thousands)
453 Ravendale Drive	March 1, 2012	$	582	$	494	$	88
100 Federal Street	March 13, 2012		67,848		52,529		15,319
Fountain Square	October 4, 2012		37,035		8,669		28,366
Mountain View Research Park	April 10, 2013		13,508		—		13,508
Mountain View Technology Park	April 10, 2013		3,168		—		3,168
767 Fifth Avenue (the General Motors Building)	May 31, 2013		167,764		—		167,764
Total		$	289,905	$	61,692	$	228,213

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Real Estate Operating Expenses

Real estate operating expenses from our Properties Acquired or Consolidated Portfolio increased approximately $73.9 million for the year ended December 31, 2013 compared to 2012, as detailed below:

Property	Date Acquired	Real Estate Operating Expenses for the year ended December  31,
		2013		2012		Change
		(in thousands)
453 Ravendale Drive	March 1, 2012	$	161	$	149	$	12
100 Federal Street	March 13, 2012		28,704		22,141		6,563
Fountain Square	October 4, 2012		12,411		3,088		9,323
Mountain View Research Park	April 10, 2013		2,996		—		2,996
Mountain View Technology Park	April 10, 2013		554		—		554
767 Fifth Avenue (the General Motors Building)	May 31, 2013		54,458		—		54,458
Total		$	99,284	$	25,378	$	73,906

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Acquired or Consolidated Portfolio increased by approximately $107.9 million for the year ended December 31, 2013 compared to 2012 as a result of the acquisition or consolidation of properties after December 31, 2012, as well as the additional depreciation expense incurred for the year ended December 31, 2013 associated with 453 Ravendale Drive, 100 Federal Street and Fountain Square, which were acquired on March 1, 2012, March 13, 2012 and October 4, 2012, respectively, and, as a result, were not recognizing depreciation expense for the full year ended December 31, 2012.

For a discussion of the operating results for 767 Fifth Avenue (the General Motors Building), Mountain View Research Park and Mountain View Technology Park for the period prior to consolidation / acquisition refer to “Results of Operations—Other Income and Expense Items—Income from Unconsolidated Joint Ventures” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Properties Placed In-Service Portfolio

We had six properties that were placed in-service or partially placed in-service between January 1, 2012 and December 31, 2013. The square footage amount for the four properties that are fully placed in-service is approximately 1.1 million. One and Two Patriots Park is a two-phase redevelopment project for a single tenant.

Rental Revenue

Rental revenue from our Properties Placed In-Service Portfolio increased approximately $16.5 million for the year ended December 31, 2013 compared to 2012, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Rental Revenue for the year ended December 31,
			2013		2012		Change
			(in thousands)
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012	$	22,141	$	19,577	$	2,564
One and Two Patriots Park	Second Quarter, 2012 (Phase I) and First Quarter, 2013 (Phase II)	Second Quarter, 2012 (Phase I) and First Quarter, 2013 (Phase II)		15,889		8,135		7,754
Seventeen Cambridge Center	Second Quarter, 2013	Second Quarter, 2013		5,717		—		5,717
250 West 55th Street	Third Quarter, 2013	N/A		311		—		311
The Avant at Reston Town Center	Fourth Quarter, 2013	N/A		157		—		157
Total			$	44,215	$	27,712	$	16,503

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Termination Income

Included above for the year ended December 31, 2013 is approximately $0.4 million of termination income related to two tenants, of which approximately $0.3 million was related to a retail tenant at our 510 Madison Avenue building.

Included above for the year ended December 31, 2012 is the remaining approximately $2.6 million of termination income related to lease amendments we signed on July 1, 2011 with the existing tenant at our three-building Patriots Park complex on Sunrise Valley Drive in Reston, Virginia. Under the amendments, the existing tenant terminated early its leases for approximately 523,000 square feet at the complex and was responsible for certain payments to us aggregating approximately $15.7 million.

Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $5.8 million for the year ended December 31, 2013 compared to 2012, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Real Estate Operating Expenses for the year ended December 31,
			2013		2012		Change
			(in thousands)
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012	$	7,082	$	6,223	$	859
One and Two Patriots Park	Second Quarter, 2012 (Phase I) and First Quarter, 2013 (Phase II)	Second Quarter, 2012 (Phase I) and First Quarter, 2013 (Phase II)		4,223		1,381		2,842
Seventeen Cambridge Center	Second Quarter, 2013	Second Quarter, 2013		353		—		353
250 West 55th Street	Third Quarter, 2013	N/A		1,340		—		1,340
The Avant at Reston Town Center	Fourth Quarter, 2013	N/A		364		—		364
Total			$	13,362	$	7,604	$	5,758

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio increased by approximately $4.9 million for the year ended December 31, 2013 compared to 2012.

Properties in Development or Redevelopment Portfolio

At December 31, 2013 and 2012, the Properties in Development or Redevelopment Portfolio consisted primarily of our 601 Massachusetts Avenue property located in Washington, DC.

On April 25, 2013, we commenced development of our 601 Massachusetts Avenue property, which is expected to be completed during the fourth quarter of 2015. Prior to the commencement of development, this building was operational and, during the year ended December 31, 2013 and 2012, had revenue of approximately $2.2 million and $7.1 million, respectively, and operating expenses of approximately $0.4 million and $1.1 million, respectively. In addition, the decrease in depreciation expense of approximately $1.6 million is the result of the property being taken out of service on April 25, 2013 and therefore not incurring a full year of depreciation expense.

Other Operating Income and Expense Items

Residential Net Operating Income

Net operating income for our residential properties increased by approximately $0.8 million for the year ended December 31, 2013 compared to 2012.

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The following reflects our occupancy and rate information for The Lofts at Atlantic Wharf and the Residences on The Avenue for the year ended December 31, 2013 and 2012.

	The Lofts at Atlantic Wharf									Residences on The Avenue
	2013			2012			Percentage Change			2013			2012			Percentage Change
Average Physical Occupancy(1)		98.6	%		95.8	%		2.9	%		93.4	%		90.0	%		3.8	%
Average Economic Occupancy(2)		97.6	%		92.0	%		6.1	%		93.0	%		89.2	%		4.3	%
Average Monthly Rental Rate(3)	$	3,778		$	3,640			3.8	%	$	3,295		$	3,213			2.6	%
Average Rental Rate Per Occupied Square Foot	$	4.20		$	4.08			2.9	%	$	4.04		$	3.94			2.5	%

(1) Average Physical Occupancy is defined as the average number of occupied units divided by the total number of units, expressed as a percentage.

(2) Average Economic Occupancy is defined as total possible revenue less vacancy loss as a percentage of total possible revenue. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Trends in market rents for a region as reported by others could vary. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.

(3) Average Monthly Rental Rates are calculated by us as rental revenue in accordance with GAAP, divided by the weighted monthly average number of occupied units.

Hotel Net Operating Income

Net operating income for the Cambridge Center Marriott hotel property increased by approximately $2.1 million for the year ended December 31, 2013 compared to 2012 due primarily to improvements in revenue per available room (“REVPAR”) and occupancy. We expect our hotel net operating income for fiscal 2014 to be between $12 million and $13 million.

The following reflects our occupancy and rate information for the Cambridge Center Marriott hotel for the year ended December 31, 2013 and 2012.

	2013			2012			Percentage Change
Occupancy		79.8	%		78.8	%		1.3	%
Average daily rate	$	233.95		$	226.58			3.3	%
REVPAR	$	186.71		$	178.66			4.5	%

Development and Management Services

Development and management services income decreased approximately $4.4 million for the year ended December 31, 2013 compared to 2012. The decrease was due to decreases in development and management fee income of approximately $1.4 million and $3.0 million, respectively. The decrease in development fees is primarily due to a decrease in fees associated with tenant improvement project management. The net decrease in management fees is due primarily to a decrease in management fees earned from our joint ventures primarily due to the consolidation/acquisition of 767 Fifth Avenue (the General Motors Building) and the Mountain View assets and the sale of 125 West 55th Street in New York City, partially offset by an increase in tenant service income. We expect fee income for fiscal 2014 to be between $19 million and $22 million. Our 2014 estimates are

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less than 2013 due to the conclusion of several fee development projects in Washington, DC and Boston as well as the change in the accounting for 767 Fifth Avenue (the General Motors Building). As a result of the consolidation of 767 Fifth Avenue (the General Motors Building), the management fees for the building that were approximately $5 million per year will no longer be recognized as fee income. Instead our partners’ 40% share will be reflected as an adjustment to noncontrolling interest in property partnerships.

General and Administrative

General and administrative expenses increased approximately $25.2 million for the year ended December 31, 2013 compared to 2012. On March 11, 2013, we announced that Owen D. Thomas would succeed Mortimer B. Zuckerman as our Chief Executive Officer, effective April 2, 2013. Mr. Zuckerman will continue to serve as Executive Chairman for a transition period and thereafter is expected to continue to serve as the Non-Executive Chairman of the Board. In connection with succession planning, Mr. Zuckerman entered into a Transition Benefits Agreement with us. If Mr. Zuckerman remains employed by us through July 1, 2014, he will be entitled to receive, on January 1, 2015, a lump sum cash payment of $6.7 million and an equity award with a targeted value of approximately $11.1 million. The cash payment and equity award vest one-third on each of March 10, 2013, October 1, 2013 and July 1, 2014, subject to acceleration in certain circumstances. As a result, we recognized approximately $13.8 million of compensation expense during the year ended December 31, 2013. We expect to recognize the remaining approximately $4.0 million of compensation expense over the remaining vesting period and, accordingly, expect to expense approximately $2.0 million in each of the 1st and 2nd quarters of 2014. In addition, the agreement provides that if Mr. Zuckerman terminates his employment with us for any reason, voluntarily or involuntarily, he will become fully vested in any outstanding equity awards with time-based vesting. As a result, during the year ended December 31, 2013, we accelerated the remaining approximately $12.9 million of stock-based compensation expense associated with Mr. Zuckerman’s unvested long-term equity awards. During the year ended December 31, 2012, we recognized approximately $4.6 million of amortization that occurred prior to the accelerated vesting of the $12.9 million of stock-based compensation expense associated with the Transition Benefits Agreement. The remaining increase was primarily due to (1) an approximately $2.6 million increase related to the issuance of the 2013 MYLTIP Units and non-qualified stock options, (2) an approximately $1.3 million increase in health insurance costs, (3) an approximately $1.7 million increase in the value of our deferred compensation plan, (4) an approximately $0.8 million increases in taxes and (5) an approximately $3.1 million increase in other general and administrative expenses, which includes compensation expenses. This increase was partially offset by (1) approximately $1.9 million of amortization that occurred for a member of senior management in 2012 that did not recur in 2013 due to the fact that this person reached retirement age and therefore became fully vested in time-based equity awards and we no longer recognized expense on a quarterly basis and (2) our recognition of approximately $4.5 million of expense during the first quarter of 2012 in connection with the resignation of E. Mitchell Norville, our Chief Operating Officer, on February 29, 2012, which did not recur in 2013.

We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. These expenses, which totaled approximately $8.1 million and $7.7 million for the year ended December 31, 2013 and 2012, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented. We expect our fiscal 2014 general and administrative expenses to be between $100 million and $104 million, which includes approximately $1.2 million associated with the termination of the 2011 OPP Awards. Refer to Note 20 of the Consolidated Financial Statements.

Wages directly related to the development of rental properties are not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Capitalized wages for the year ended December 31, 2013 and 2012 were approximately $12.8 million and $12.7 million, respectively. These costs are not included in the general and administrative expenses discussed above.

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Transaction Costs

During the year ended December 31, 2013 we incurred approximately $1.7 million of transaction costs of which approximately $0.6 million related to the acquisition of the Mountain View Research Park and Mountain View Technology Park properties in Mountain View, California, approximately $0.4 million related to Transbay Tower in San Francisco, California, approximately $0.5 million related to transaction costs for transactions in New York City and approximately $0.2 million related to the pursuit of other transactions.

During the year ended December 31, 2012, we incurred approximately $3.7 million of transaction pursuit costs of which approximately $0.6 million related to the acquisition of 680 Folsom Street in San Francisco, California, approximately $0.5 million related to the acquisition of Fountain Square in Reston, Virginia, approximately $0.3 million related to the forming of a joint venture to pursue the acquisition of land in San Francisco, California to construct the Transbay Tower, approximately $0.6 million related to the acquisition of 100 Federal Street in Boston, Massachusetts and approximately $1.7 million related to the pursuit of other transactions.

Impairment Loss

On March 28, 2013, we executed a binding contract for the sale of our 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. The pending sale of this asset caused us to evaluate our strategy for development of the adjacent Almaden land parcel which can accommodate approximately 840,000 square feet of office development. Based on a shorter than expected hold period, we reduced the carrying value of the land parcel to its fair market value and recognized an impairment loss of approximately $8.3 million during the three months ended March 31, 2013.

Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the year ended December 31, 2013 compared to 2012, income from unconsolidated joint ventures increased by approximately $26.0 million due primarily to (1) an increase of approximately $41.1 million in our share of net income from the sale of 125 West 55th Street on May 30, 2013 and (2) an increase of approximately $11.3 million in our share of net income from the sale of the Eighth Avenue and 46th Street project in New York City partially offset by the following: (1) an approximately $21.0 million decrease in our share of net income from 767 Fifth Avenue (the General Motors Building) related to the consolidation on June 1, 2013 and termination income that was received during 2012 that did not recur in 2013, (2) an approximately $3.2 million decrease in our share of net income from 540 Madison Avenue due to lease expirations, (3) an approximately $1.1 million decrease in our share of net income from the Value-Added Fund due to our acquisition of the Mountain View assets on April 10, 2013 which includes approximately $0.2 million of gain recognized during 2012 related to the sale of 300 Billerica Road in Chelmsford, Massachusetts and (4) an approximately $1.1 million decrease in our share of net income from our other unconsolidated joint ventures.

On July 19, 2013, a joint venture in which we have a 50% interest completed the sale of its Eighth Avenue and 46th Street project located in New York City for an imputed sale price of $45.0 million. Eighth Avenue and 46th Street is comprised of an assemblage of land parcels and air-rights. Net cash proceeds to us totaled approximately $21.8 million, after the payment of transaction costs. The joint venture had previously recognized an impairment loss on the property. As a result, the joint venture recognized a gain on sale of real estate totaling approximately $12.6 million, of which our share was approximately $11.3 million.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial

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statements instead of under the equity method of accounting. Our ownership interest in 767 Venture, LLC remained unchanged at 60%. Due to the consolidation effective June 1, 2013, only five months of activity are being shown for the year ended December 31, 2013 compared to a full year in 2012 resulting in a decrease in income from unconsolidated joint ventures of approximately $9.2 million. In aggregate, the total decrease, which includes the termination income detailed below, and the decrease in income due to consolidation is approximately $21.0 million for the year ended December 31, 2013 compared to 2012.

On May 14, 2012, an unconsolidated joint venture in which we have a 60% interest entered into a lease termination agreement with an existing tenant at 767 Fifth Avenue (the General Motors Building) in New York City. Under the agreement, the tenant terminated early its lease for approximately 36,000 square feet at the building and is responsible for certain payments to the unconsolidated joint venture aggregating approximately $28.4 million through May 1, 2014 (of which our share is approximately $17.0 million). As a result of the termination, we recognized termination income totaling approximately $11.8 million (which is net of the write-off of the accrued straight-line rent balance) during the year ended ended December 31, 2012.

On May 30, 2013, a joint venture in which we have a 60% interest completed the sale of its 125 West 55th Street property located in New York City for a sale price of $470.0 million, including the assumption by the buyer of the mortgage loan collateralized by the property totaling approximately $198.6 million. The mortgage loan bore interest at a fixed rate of 6.09% per annum and was scheduled to mature on March 10, 2020. Net cash proceeds totaled approximately $253.7 million, of which our share was approximately $152.2 million, after the payment of transaction costs. 125 West 55th Street is a Class A office property totaling approximately 588,000 net rentable square feet. We had previously recognized an impairment loss on our investment in the unconsolidated joint venture. As a result, we recognized a gain on sale of real estate totaling approximately $43.2 million. Due to the sale on May 30, 2013, only five months of activity are being shown for the year ended December 31, 2013 compared to a full year in 2012 resulting in a decrease in income from unconsolidated joint ventures of approximately $2.1 million.

On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from the Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and account for them on a consolidated basis. Due to the acquisition, the Value-Added Fund, excluding the gain on the sale of 300 Billerica Road in Chelmsford, Massachusetts, contributed an approximately $1.3 million loss to our share of the income for the year ended December 31, 2013 compared to 2012.

For the consolidated operating results for 767 Fifth Avenue (the General Motors Building), Mountain View Research Park and Mountain View Technology Park refer to “Results of Operations—Properties Acquired Portfolio” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Gains on Consolidation of Joint Ventures

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial statements instead of under the equity method of accounting. Our ownership interest in 767 Venture, LLC remained unchanged at 60%. During the year ended December 31, 2013, we recognized a non-cash gain on our investment of approximately $359.5 million.

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On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from the Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and account for them on a consolidated basis. During the year ended December 31, 2013, we recognized a gain upon consolidation totaling approximately $26.5 million.

Interest and Other Income

Interest and other income decreased approximately $1.8 million for the year ended December 31, 2013 compared to 2012, of which $1.1 million was related to an insurance claim that we received during 2012 that did not recur in 2013 and the remaining decrease of approximately $0.7 million related to interest income. The decrease in interest income was due primarily to interest income that we recognized related to the loans that we made to our Value-Added Fund. On April 10, 2013 we acquired the Mountain View properties from the Value-Added Fund and the loans were repaid (Refer to Notes 3 and 5 of the Consolidated Financial Statements). The loans to the Value-Added Fund had been reflected in Related Party Note Receivable on our Consolidated Financial Statements.

Gains from Investments in Securities

Gains from investments in securities for the year ended December 31, 2013 and 2012 related to investments that we have made to reduce our market risk relating to a deferred compensation plan that we maintain for our officers. Under this deferred compensation plan, each officer who is eligible to participate is permitted to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. In order to reduce our market risk relating to this plan, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer. This enables us to generally match our liabilities to our officers under the deferred compensation plan with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains from investments in securities. During the year ended December 31, 2013 and 2012, we recognized gains of approximately $2.9 million and $1.4 million, respectively, on these investments. By comparison, our general and administrative expense increased by approximately $2.9 million and $1.3 million during the year ended December 31, 2013 and 2012, respectively, as a result of increases in our liability under our deferred compensation plan that were associated with the performance of the specific investments selected by our officers participating in the plan.

Gains (Losses) from Early Extinguishments of Debt

For the year ended December 31, 2013, we had a gain from early extinguishments of debt of approximately $0.1 million due to the following transactions:

On April 15, 2013, we announced that holders of our Operating Partnership’s 3.75% Exchangeable Senior Notes due 2036 (the “Notes”) had the right to surrender their Notes for purchase by our Operating Partnership (the “Put Right”) on May 18, 2013. On April 15, 2013, we also announced that our Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on May 18, 2013 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the notice of redemption, holders of the Notes had the right to exchange their Notes on or prior to May 16, 2013. Notes with respect to which the Put Right was not exercised and that were not surrendered for exchange on or prior to May 16, 2013, were redeemed by our Operating Partnership at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon to, but excluding, the Redemption Date. Based on final information provided to our Operating Partnership by the trustee for the Notes, no Notes were validly tendered and accepted for purchase in the Put Right. Pursuant to the notice of redemption, an aggregate principal amount of $990,000 of the Notes was redeemed on May 18, 2013. The remaining aggregate principal amount of $449,010,000 of the Notes was surrendered for exchange and, in addition to the repayment of the principal in cash, we issued an aggregate of

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419,116 shares of our common stock in exchange for the Notes. We recognized a loss on early extinguishment of debt totaling approximately $0.1 million consisting of transaction costs.

On April 1, 2013, we used available cash to repay the mortgage loan collateralized by our 140 Kendrick Street property located in Needham, Massachusetts totaling approximately $47.6 million. The mortgage loan bore interest at a fixed rate of 7.51% per annum and was scheduled to mature on July 1, 2013. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

For the year ended December 31, 2012, we had a loss from early extinguishments of debt of approximately $4.5 million due to the following transactions:

On September 4, 2012, we used available cash to repay the mortgage loan collateralized by our Sumner Square property located in Washington, DC totaling approximately $23.2 million. The mortgage financing bore interest at a fixed rate of 7.35% per annum and was scheduled to mature on September 1, 2013. We recognized a loss on early extinguishment of debt totaling approximately $0.3 million, which included a prepayment penalty totaling approximately $0.2 million associated with the early repayment.

On August 24, 2012, our Operating Partnership used available cash to redeem the remaining $225.0 million in aggregate principal amount of its 6.25% senior notes due 2013. The redemption price was determined in accordance with the applicable indenture and totaled approximately $231.6 million. The redemption price included approximately $1.5 million of accrued and unpaid interest to, but not including, the redemption date. Excluding such accrued and unpaid interest, the redemption price was approximately 102.25% of the principal amount being redeemed. We recognized a loss on early extinguishment of debt totaling approximately $5.2 million, which amount included the payment of the redemption premium totaling approximately $5.1 million.

On April 2, 2012, we used available cash to repay the mortgage loan collateralized by our One Freedom Square property located in Reston, Virginia totaling $65.1 million. The mortgage financing bore interest at a fixed rate of 7.75% per annum and was scheduled to mature on June 30, 2012. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

On March 12, 2012, we used available cash to repay the mortgage loan collateralized by our Bay Colony Corporate Center property located in Waltham, Massachusetts totaling $143.9 million. The mortgage financing bore interest at a fixed rate of 6.53% per annum and was scheduled to mature on June 11, 2012. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.9 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

In connection with the repurchase and redemption in February 2012 of our Operating Partnership’s 2.875% Exchangeable Senior Notes due 2037, we recognized a loss on early extinguishment of debt of approximately $0.1 million related to the expensing of transaction related costs.

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Interest Expense

Interest expense for the Total Property Portfolio increased approximately $35.9 million for the year ended December 31, 2013 compared to 2012 as detailed below:

Component	Change in  interest expense for the year ended December 31, 2013 compared to December 31, 2012
	(in thousands)
Increases to interest expense due to:
Interest associated with the consolidation of the $1.6 billion of debt outstanding for 767 Fifth Avenue (the General Motors Building)	$	31,397
Issuance of $1.0 billion in aggregate principal of our Operating Partnership’s 3.850% senior notes due 2023 on June 11, 2012		17,173
Partner’s share of the interest for the outstanding Outside Members’ Notes Payable for 767 Fifth Avenue (the General Motors Building)		16,044
Issuance of $700 million in aggregate principal of our Operating Partnership’s 3.800% senior notes due 2024 on June 27, 2013		13,634
Issuance of $500 million in aggregate principal of our Operating Partnership’s 3.125% senior notes due 2023 on April 11, 2013		11,514
New mortgage/properties placed in-service financings		4,572
Total increases to interest expense	$	94,334
Decreases to interest expense due to:
Increase in capitalized interest	$	(23,873	)
Repurchases/redemption/exchange of $450.0 million in aggregate principal of our Operating Partnership’s 3.75% exchangeable senior notes due 2036		(10,594	)
Redemption of $225.0 million in aggregate principal of our Operating Partnership’s 6.25% senior notes due 2013		(8,014	)
Repayment of mortgage financings		(6,418	)
Interest expense associated with the accretion of the adjustment for the equity component allocation of our unsecured exchangeable debt		(6,004	)
Repurchases/redemption of $576.2 million in aggregate principal of our Operating Partnership’s 2.875% exchangeable senior notes due 2037		(3,053	)
Other interest expense (excluding senior notes)		(468	)
Total decreases to interest expense	$	(58,424	)
Total change in interest expense	$	35,910

The following property is included in the new mortgages/properties placed in-service financings line item: Fountain Square. The following properties are included in the repayment of mortgage financings line item: Bay Colony Corporate Center, One Freedom Square, Sumner Square, Kingstowne One and 140 Kendrick Street. As properties are placed in-service, we cease capitalizing interest and interest is then expensed.

Interest expense directly related to the development of rental properties is not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Interest capitalized for the year ended December 31, 2013 and 2012 was approximately $68.2 million and $44.3 million, respectively. These costs are not included in the interest expense referenced above.

We anticipate net interest expense for 2014 will be approximately $448 million to $452 million. This estimate assumes approximately $54 million to $58 million of capitalized interest. The estimates for 2014 reflect

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the repayment at maturity of the $747.5 million of 3.625% exchangeable senior notes ,which occurred on February 18, 2014, and assumes the repayment of $63.0 million of secured debt that matures in October 2014. These estimates also assume that we will not incur any additional indebtedness, make additional prepayments or repurchases of existing indebtedness and that there will not be any fluctuations in interest rates or any changes in our development activity.

At December 31, 2013, our variable rate debt consisted of our Operating Partnership’s $1.0 billion Unsecured Line of Credit, of which no amount was outstanding at December 31, 2013. For a summary of our consolidated debt as of December 31, 2013 and December 31, 2012 refer to the heading “Liquidity and Capital Resources—Capitalization—Debt Financing” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Discontinued Operations

On December 20, 2013, we completed the sale of our 10 & 20 Burlington Mall Road property located in Burlington, Massachusetts for a sale price of approximately $30.0 million. Net cash proceeds totaled approximately $29.4 million, resulting in a gain on sale of approximately $20.5 million. 10 & 20 Burlington Mall Road consists of two Class A office properties aggregating approximately 152,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On December 20, 2013, we completed the sale of our One Preserve Parkway property located in Rockville, Maryland for a sale price of approximately $61.3 million. Net cash proceeds totaled approximately $59.9 million, resulting in a gain on sale of approximately $5.9 million. One Preserve Parkway is a Class A office property totaling approximately 184,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On August 22, 2013, we completed the sale of our 1301 New York Avenue property located in Washington, DC for a net contract sale price of approximately $121.7 million. After adjusting for outstanding lease and other transaction costs assumed by the buyer, the gross sale price was approximately $135.0 million. Net cash proceeds totaled approximately $121.5 million, resulting in a gain on sale of approximately $86.4 million. 1301 New York Avenue is a Class A office property totaling approximately 201,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On June 28, 2013, we completed the sale of our 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. Net cash proceeds totaled approximately $39.3 million. 303 Almaden Boulevard is a Class A office property totaling approximately 158,000 net rentable square feet. Because we entered into the related purchase and sale agreement on March 28, 2013 and the carrying value of the property exceeded its net sale price, we recognized an impairment loss totaling approximately $3.2 million during the three months ended March 31, 2013. As a result, there was no loss on sale of real estate recognized during the year ended December 31, 2013. The impairment loss and operating results of this property have been classified as discontinued operations on a historical basis for all periods presented.

On February 20, 2013, the foreclosure sale of our Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million during the year ended December 31, 2013. The operating results of the property through the date of ratification have been classified as discontinued operations on a historical basis for all periods presented.

On May 17, 2012, we completed the sale of our Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash. Net cash proceeds totaled approximately $62.0 million,

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resulting in a gain on sale of approximately $36.9 million. Bedford Business Park is comprised of two Office/Technical buildings and one Class A office building aggregating approximately 470,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships decreased by approximately $2.4 million for the year ended December 31, 2013 compared to 2012. Noncontrolling interests in property partnerships consisted of the outside owners’ equity interest in the net income (loss) from our 505 9th Street, Fountain Square, 767 Fifth Avenue (the General Motors Building) and Time Square Tower properties as of December 31, 2013 and 505 9th Street and Fountain Square as of December 31, 2012.

On October 9, 2013, we completed the sale of a 45% ownership interest in our Times Square Tower property for a gross sale price of $684.0 million in cash. Net cash proceeds totaled approximately $673.1 million, after the payment of transaction costs. In connection with the sale, we formed a joint venture with the buyer and will provide customary property management and leasing services to the joint venture. Times Square Tower is an approximately 1,246,000 net rentable square foot Class A office tower located in New York City. The transaction did not qualify as a sale of real estate for financial reporting purposes because we continue to control the joint venture and will therefore continue to account for the entity on a consolidated basis in our financial statements. We have accounted for the transaction as an equity transaction and have recognized noncontrolling interest in our consolidated balance sheets totaling approximately $243.5 million, which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction. The difference between the net cash proceeds received and the noncontrolling interest recognized, which difference totals approximately $429.6 million, has not been reflected as a gain on sale of real estate in our consolidated statements of operations and has instead been reflected as an increase to additional paid-in capital in our consolidated balance sheets. This building contributed an increase in noncontrolling interests in property partnerships of approximately $5.8 million for the year ended December 31, 2013.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial statements instead of under the equity method of accounting. Our ownership interest in 767 Venture, LLC remained unchanged at 60%. This building contributed a decrease in noncontrolling interests in property partnerships of approximately $13.5 million for the year ended December 31, 2013. This decrease was primarily due to the partners’ share of the interest expense for the outside member’s notes payable.

On October 4, 2012, we completed the formation of a joint venture which owns and operates Fountain Square located in Reston, Virginia, adjacent to our other Reston properties. Fountain Square is an office and retail complex aggregating approximately 756,000 net rentable square feet, comprised of approximately 522,000 net rentable square feet of Class A office space and approximately 234,000 net rentable square feet of retail space. The joint venture partner contributed the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a 50% interest in the joint venture. We contributed cash totaling approximately $87.0 million for our 50% interest, which cash was distributed to the joint venture partner. We are consolidating this joint venture. The mortgage loan bears interest at a fixed rate of 5.71% per annum and matures on October 11, 2016. Pursuant to the joint venture agreement (i) we have rights to acquire the partner’s 50% interest and (ii) the partner has the right to cause us to acquire the partner’s interest on January 4, 2016, in each case at a fixed price totaling approximately $102.0 million in cash. The fixed price option rights expire on January 31, 2016. This building contributed an increase in noncontrolling interests in property partnerships of approximately $6.6 million and $1.8 million for the year ended December 31, 2013 and 2012, respectively.

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Noncontrolling Interest—Common Units of the Operating Partnership

Noncontrolling interest—common units of the Operating Partnership increased by approximately $40.0 million for the year ended December 31, 2013 compared to 2012 due to a increase in allocable income partially offset by a decrease in the noncontrolling interest’s ownership percentage.

Comparison of the year ended December 31, 2012 to the year ended December 31, 2011

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 119 properties totaling approximately 30.9 million net rentable square feet of space, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to January 1, 2011 and owned and in service through December 31, 2012. The Total Property Portfolio includes the effects of the other properties either placed in-service, acquired or in development or redevelopment after January 1, 2011 or disposed of on or prior to December 31, 2012. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the year ended December 31, 2012 and 2011 with respect to the properties which were placed in-service, acquired or in development or redevelopment.

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	Same Property Portfolio										Properties Acquired Portfolio					Properties Placed In-Service Portfolio				Properties in  Development or Redevelopment Portfolio						Total Property Portfolio
(dollars in thousands)	2012		2011		Increase/ (Decrease)			% Change			2012		2011			2012		2011		2012			2011			2012			2011			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	1,549,004	$	1,534,210	$	14,794			0.96	%	$	90,015	$	19,883		$	126,031	$	73,792	$	(34	)	$	10,228		$	1,765,016		$	1,638,113		$	126,903			7.75	%
Termination Income		7,047		3,638		3,409			93.71	%		577		(20	)		—		2,591		2,571			10,535			10,195			16,744			(6,549	)		(39.11	)%
Total Rental Revenue		1,556,051		1,537,848		18,203			1.18	%		90,592		19,863			126,031		76,383		2,537			20,763			1,775,211			1,654,857			120,354			7.27	%
Real Estate Operating Expenses		546,936		526,083		20,853			3.96	%		40,241		12,313			51,891		31,561		20			2,711			639,088			572,668			66,420			11.60	%
Net Operating Income, excluding hotel		1,009,115		1,011,765		(2,650	)		(0.26	)%		50,351		7,550			74,140		44,822		2,517			18,052			1,136,123			1,082,189			53,934			4.98	%
Hotel Net Operating Income (1)		9,795		8,401		1,394			16.59	%		—		—			—		—		—			—			9,795			8,401			1,394			16.59	%
Consolidated Net Operating Income(1)		1,018,910		1,020,166		(1,256	)		(0.12	)%		50,351		7,550			74,140		44,822		2,517			18,052			1,145,918			1,090,590			55,328			5.07	%
Other Revenue:
Development and management services		—		—		—			—			—		—			—		—		—			—			34,060			33,406			654			1.96	%
Other Expenses:
General and administrative expense		—		—		—			—			—		—			—		—		—			—			90,129			87,101			3,028			3.48	%
Transaction costs		—		—		—			—			—		—			—		—		—			—			3,653			1,987			1,666			83.84	%
Depreciation and amortization		363,237		358,957		4,280			1.19	%		43,729		13,516			36,973		38,592		1,936			18,677			445,875			429,742			16,133			3.75	%
Total Other Expenses		363,237		358,957		4,280			1.19	%		43,729		13,516			36,973		38,592		1,936			18,677			539,657			518,830			20,827			4.01	%
Operating Income		655,673		661,209		(5,536	)		(0.84	)%		6,622		(5,966	)		37,167		6,230		581			(625	)		640,321			605,166			35,155			5.81	%
Other Income:
Income from unconsolidated joint ventures																											49,078			85,896			(36,818	)		(42.86	)%
Interest and other income																											10,091			5,358			4,733			88.34	%
Gains (losses) from investments in securities																											1,389			(443	)		1,832			413.54	%
Other Expenses:
Interest expense																											410,970			391,533			19,437			4.96	%
Losses from early extinguishments of debt																											4,453			1,494			2,959			198.06	%
Income from continuing operations																											285,456			302,950			(17,494	)		(5.77	)%
Discontinued operations:
Income from discontinued operations																											9,806			10,876			(1,070	)		(9.84	)%
Gain on sale of real estate from discontinued operations																											36,877			—			36,877			100.00	%
Net income																											332,139			313,826			18,313			5.84	%
Net income attributable to noncontrolling interests:
Noncontrolling interests in property partnerships																											(3,792	)		(1,558	)		(2,234	)		(143.39	)%
Noncontrolling interest—redeemable preferred units of the Operating Partnership																											(3,497	)		(3,339	)		(158	)		(4.73	)%
Noncontrolling interest—common units of the Operating Partnership																											(30,125	)		(35,007	)		4,882			13.95	%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																											(5,075	)		(1,243	)		(3,832	)		(308.29	)%
Net Income attributable to Boston Properties, Inc.																										$	289,650		$	272,679		$	16,971			6.22	%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 62. Hotel Net Operating Income for the year ended December 31, 2012 and 2011 are comprised of Hotel Revenue of $37,915 and $34,529 less Hotel Expenses of $28,120 and $26,128, respectively, per the Consolidated Statements of Operations.

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Same Property Portfolio

Rental Revenue

Rental revenue from the Same Property Portfolio increased approximately $14.8 million for the year ended December 31, 2012 compared to 2011. The increase was primarily the result of an increase of approximately $9.3 million in rental revenue from our leases and increases in parking and other income of approximately $3.4 million and $2.1 million, respectively. The increase in rental revenue from our leases of approximately $9.3 million was the result of our average revenue increasing by approximately $0.47 per square foot, contributing approximately $13.3 million, offset by an approximately $4.0 million decrease due to a decline in average occupancy from 92.5% to 92.2%.

Termination Income

Termination income increased by approximately $3.4 million for the year ended December 31, 2012 compared to 2011.

Termination income for the year ended December 31, 2012 related to twenty-three tenants across the Same Property Portfolio and totaled approximately $7.0 million of which approximately $3.6 million was from the settlement of a bankruptcy claim against a former tenant that rejected our lease in 2009 and approximately $0.9 million was a negotiated termination from one of our Reston, Virginia properties in order to accommodate growth of an existing tenant.

Termination income for the year ended December 31, 2011 related to fourteen tenants across the Same Property Portfolio and totaled approximately $3.6 million, which included approximately $1.8 million of termination income related to a default by a 30,000 square foot law firm tenant in one of our New York City properties.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $20.9 million for the year ended December 31, 2012 compared to 2011. This increase was primarily due to (1) an increase of approximately $13.4 million, or 5.7% in real estate taxes, which primarily occurred in our Boston, New York and Washington, DC regions, (2) an approximately $3.2 million cumulative non-cash straight-line adjustment for ground rent expense (refer to Note 2 to the Consolidated Financial Statements) and (3) an approximately $4.3 million, or 1.4%, increase in other property operating expenses.

We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. These expenses, which totaled approximately $7.7 million and $7.5 million for the year ended December 31, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

Depreciation and Amortization Expense

Depreciation and amortization expense for the Same Property Portfolio increased approximately $4.3 million, or 1.2%, for the year ended December 31, 2012 compared to 2011.

Properties Acquired Portfolio

On February 1, 2011, we completed the acquisition of Bay Colony Corporate Center in Waltham, Massachusetts for an aggregate purchase price of approximately $185.0 million. Bay Colony Corporate Center is an approximately 985,000 net rentable square foot, four-building Class A office park situated on a 58-acre site in Waltham, Massachusetts.

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On November 22, 2011, we acquired 2440 West El Camino Real located in Mountain View, California for a net purchase price of approximately $71.1 million. 2440 West El Camino Real is an approximately 140,000 net rentable square foot Class A office property.

On March 1, 2012, we acquired 453 Ravendale Drive located in Mountain View, California for a purchase price of approximately $6.7 million in cash. 453 Ravendale Drive is an approximately 30,000 net rentable square foot Office/Technical property.

On March 13, 2012, we acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash. In connection with the transaction, we entered into a long-term lease with an affiliate of Bank of America for approximately 732,000 square feet. 100 Federal Street is an approximately 1,265,000 net rentable square foot, 37-story Class A office tower.

On October 4, 2012, we completed the formation of a joint venture which owns and operates Fountain Square located in Reston, Virginia, adjacent to our other Reston properties. Fountain Square is an office and retail complex aggregating approximately 756,000 net rentable square feet, comprised of approximately 522,000 net rentable square feet of Class A office space and approximately 234,000 net rentable square feet of retail space. We own 50% of, and are consolidating, the joint venture.

Rental Revenue

Rental revenue from our Properties Acquired Portfolio increased approximately $70.7 million for the year ended December 31, 2012 compared to 2011, as detailed below:

Property	Date Acquired	Rental Revenue for  the year ended December 31,
		2012		2011		Change
		(in thousands)
Bay Colony Corporate Center	February 1, 2011	$	20,778	$	19,047	$	1,731
2440 West El Camino Real	November 22, 2011		8,122		816		7,306
453 Ravendale Drive	March 1, 2012		494		—		494
100 Federal Street	March 13, 2012		52,529		—		52,529
Fountain Square	October 4, 2012		8,669		—		8,669
Total		$	90,592	$	19,863	$	70,729

Real Estate Operating Expenses

Real estate operating expenses from our Properties Acquired Portfolio increased approximately $27.9 million for the year ended December 31, 2012 compared to 2011, as detailed below:

Property	Date Acquired	Real Estate Operating Expenses for the year ended December 31,
		2012		2011		Change
		(in thousands)
Bay Colony Corporate Center	February 1, 2011	$	12,410	$	12,008	$	402
2440 West El Camino Real	November 22, 2011		2,453		305		2,148
453 Ravendale Drive	March 1, 2012		149		—		149
100 Federal Street	March 13, 2012		22,141		—		22,141
Fountain Square	October 4, 2012		3,088		—		3,088
Total		$	40,241	$	12,313	$	27,928

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Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Acquired Portfolio increased by approximately $30.2 million for the year ended December 31, 2012 compared to 2011 as a result of the acquisition of properties after December 31, 2011, as well as the additional depreciation expense incurred for the year ended December 31, 2012 associated with Bay Colony Corporate Center and 2440 West El Camino Real, which were acquired on February 1, 2011 and November 22, 2011, respectively, and, as a result, were not recognizing depreciation expense for the full year ended December 31, 2011.

Properties Placed In-Service Portfolio

At December 31, 2012, we had six properties totaling approximately 2.3 million square feet that were placed in-service or partially placed in-service between January 1, 2011 and December 31, 2012.

Rental Revenue

Rental revenue from our Properties Placed In-Service Portfolio increased approximately $49.6 million for the year ended December 31, 2012 compared to 2011, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Rental Revenue for the year ended December 31,
			2012		2011		Change
			(in thousands)
2200 Pennsylvania Avenue	First Quarter, 2011	Third Quarter, 2011	$	31,052	$	17,656	$	13,396
Residences on The Avenue	Second Quarter, 2011	Third Quarter, 2011		16,632		5,632		11,000
The Lofts at Atlantic Wharf	Third Quarter, 2011	Third Quarter, 2011		3,936		985		2,951
Atlantic Wharf—Office	First Quarter, 2011	Fourth Quarter, 2011		49,235		36,775		12,460
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012		19,577		7,270		12,307
One Patriots Park	Second Quarter, 2012	Second Quarter, 2012		5,599		8,065		(2,466	)
Total			$	126,031	$	76,383	$	49,648

Termination Income

Included in rental revenue above is approximately $2.6 million of termination income for the year ended December 31, 2011 related to lease amendments we signed on July 1, 2011 with the existing tenant at our three-building complex on Sunrise Valley Drive in Reston, Virginia. Under the agreements, the existing tenant terminated early its leases for approximately 523,000 square feet at the complex and was responsible for certain payments to us aggregating approximately $15.7 million. During the year ended December 31, 2011, we recognized approximately $13.1 million of termination income related to these agreements, of which approximately $10.5 million is included within the Development or Redevelopment Portfolio. One of the three buildings, One Patriots Park, has been redeveloped and placed back in-service and is now occupied by a new tenant.

Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $20.3 million for the year ended December 31, 2012 compared to 2011, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Real Estate Operating Expenses for the year ended December 31,
			2012		2011		Change
			(in thousands)
2200 Pennsylvania Avenue	First Quarter, 2011	Third Quarter, 2011	$	18,307	$	11,326	$	6,981
Residences on The Avenue	Second Quarter, 2011	Third Quarter, 2011		9,317		4,958		4,359
The Lofts at Atlantic Wharf	Third Quarter, 2011	Third Quarter, 2011		1,675		521		1,154
Atlantic Wharf—Office	First Quarter, 2011	Fourth Quarter, 2011		15,005		10,804		4,201
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012		6,223		2,995		3,228
One Patriots Park	Second Quarter, 2012	Second Quarter, 2012		1,364		957		407
Total			$	51,891	$	31,561	$	20,330

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Real estate operating expenses for 2200 Pennsylvania Avenue and the Residences on The Avenue include ground rent expense, which includes the non-cash straight-lining of the ground rent expense of approximately $11.1 million and $5.1 million, respectively, for the year ended December 31, 2012 and $6.7 million and $2.8 million, respectively, for the year ended December 31, 2011.

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio decreased by approximately $1.6 million for the year ended December 31, 2012 compared to 2011. Approximately $17.6 million of the decrease in depreciation expense for One Patriots Park was the result of the acceleration of depreciation expense during the year ended December 31, 2011 in conjunction with the building being taken out of service for redevelopment. This decrease was partially offset by an increase of approximately $16.0 million in depreciation expense at the other buildings that were placed in-service.

Properties in Development or Redevelopment Portfolio

At December 31, 2012 and 2011, the Properties in Development or Redevelopment Portfolio consisted primarily of our 250 West 55th Street development project located in New York City and our Two Patriots Park property located in Reston, Virginia.

On February 6, 2009, we announced that we were suspending construction on our 989,000 square foot office project at 250 West 55th Street in New York City. During December 2009, we completed the construction of foundations and steel/deck to grade to facilitate a restart of construction in the future and as a result ceased interest capitalization on the project. During the year ended December 31, 2011, we recognized approximately $0.8 million of additional costs associated with the suspension and ongoing maintenance of the development project. On May 24, 2011, we signed a lease with the law firm of Morrison & Foerster LLP for approximately 184,000 square feet at 250 West 55^th Street and resumed construction of the project. As a result of our decision to resume development, in May 2011 we began interest capitalization and are no longer expensing costs associated with this project.

On July 1, 2011, we entered into lease amendments with the existing tenant at our three-building complex on Sunrise Valley Drive in Reston, Virginia, which will be redeveloped as the headquarters for a government related tenant. Under the agreements, the existing tenant terminated early its leases for approximately 523,000 square feet at the complex and was responsible for certain payments to us aggregating approximately $15.7 million. We recognized approximately $13.1 million of such termination income during 2011 of which approximately $2.6 million is included within the Placed In-Service Portfolio. We recognized the remaining approximately $2.6 million during the year ended December 31, 2012. On January 3, 2012, we commenced the redevelopment of our Two Patriots Park property at the complex, which is expected to be completed during the second quarter of 2013. During the year ended December 31, 2011, this building had revenue, excluding the $10.5 million of termination income, of approximately $10.2 million and operating expenses of approximately $1.7 million. During the year ended December 31, 2012, excluding termination income, this building had de minimis revenue and operating expenses. In addition, the decrease in depreciation of approximately $16.7 million is the result of the acceleration of depreciation expense during the year ended December 31, 2011 in conjunction with the redevelopment of this building.

Other Operating Income and Expense Items

Hotel Net Operating Income

Net operating income for the Cambridge Center Marriott hotel property increased by approximately $1.4 million for the year ended December 31, 2012 compared to 2011 due primarily to improvements in revenue per available room (“REVPAR”) and occupancy.

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The following reflects our occupancy and rate information for the Cambridge Center Marriott hotel for the year ended December 31, 2012 and 2011.

	2012			2011			Percentage Change
Occupancy		78.8	%		78.2	%		0.8	%
Average daily rate	$	226.58		$	210.45			7.7	%
Revenue per available room, REVPAR	$	178.66		$	164.15			8.8	%

Development and Management Services

Development and management services income increased approximately $0.7 million for the year ended December 31, 2012 compared to 2011. The increase was primarily due to an increase in development fee income of approximately $2.5 million partially offset by a decrease in management fee income of approximately $1.8 million. The increase in development fees is primarily due to an increase in fees associated with tenant improvement project management. The decrease in management fees is due to a decrease in leasing fees and management fees earned from our joint venture and third-party managed properties, as a result of decreases in leasing activity and third-party properties that we managed.

General and Administrative

General and administrative expenses increased approximately $3.0 million for the year ended December 31, 2012 compared to 2011. We recognized approximately $4.5 million of expense during the first quarter of 2012 in connection with the resignation of E. Mitchell Norville, our Chief Operating Officer, on February 29, 2012. This increase was partially offset by the acceleration of the remaining unrecognized compensation expense totaling approximately $4.3 million associated with the termination of the 2008 OPP Awards during the first quarter of 2011, which did not recur in 2012. The remaining increase was primarily due to (1) an approximately $3.0 million increase related to the issuance of the 2012 OPP Awards and non-qualified stock options and (2) an approximately $1.5 million increase in the value of our deferred compensation plan, partially offset by an approximately $1.7 million decrease in other general and administrative expenses, which includes a decrease in compensation expense.

We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. These expenses, which totaled approximately $7.7 million and $7.5 million for the year ended December 31, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

Wages directly related to the development of rental properties are not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Capitalized wages for the year ended December 31, 2012 and 2011 were approximately $12.7 million and $11.0 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

During the year ended December 31, 2012 we incurred approximately $3.7 million of transaction costs of which approximately $0.6 million related to the acquisition of 680 Folsom Street in San Francisco, California, approximately $0.5 million related to the acquisition of Fountain Square in Reston, Virginia, approximately $0.3 million related to the forming of a joint venture to pursue the acquisition of land in San Francisco, California to construct the Transbay Tower, approximately $0.6 million related to the acquisition of 100 Federal Street in Boston, Massachusetts and approximately $1.7 million related to the pursuit of other transactions. During the year ended December 31, 2011, we incurred approximately $2.0 million of transaction pursuit costs.

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Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the year ended December 31, 2012 compared to 2011, income from unconsolidated joint ventures decreased by approximately $36.8 million. This decrease was primarily due to the sale of Two Grand Central Tower during the year ended December 31, 2011, in which we recognized a gain of approximately $46.2 million, partially offset by an increase of approximately $2.0 million in our share of the net income from 767 Fifth Avenue (The General Motors Building) and an increase of approximately $7.4 million in our share of net income from our other unconsolidated joint ventures. The increase at 767 Fifth Avenue (The General Motors Building) was primarily due to a lease termination agreement with an existing tenant and lower amortization expense of approximately $6.7 million due to expiring leases. Under that agreement, the tenant terminated early its lease for approximately 36,000 square feet at the building and is responsible for certain payments aggregating approximately $28.4 million through May 1, 2014 (of which our share is approximately $17.0 million). As a result of the termination, we recognized termination income totaling approximately $11.8 million (which is net of the write-off of the accrued straight-line rent balance) during the year ended December 31, 2012. This increase was partially offset by a decrease in “above-” and “below-market” lease income of approximately $13.8 million and accrued straight-line rent of approximately $2.7 million at 767 Fifth Avenue (The General Motors Building).

On October 25, 2011, an unconsolidated joint venture in which we have a 60% interest completed the sale of Two Grand Central Tower located in New York City for approximately $401.0 million, including the assumption by the buyer of approximately $176.6 million of mortgage indebtedness. Net cash proceeds totaled approximately $210.0 million, of which our share was approximately $126.0 million, after the payment of transaction costs of approximately $14.4 million. Two Grand Central Tower is an approximately 650,000 net rentable square foot Class A office tower. The unconsolidated joint venture’s carrying value of the net assets of the property aggregated approximately $427.1 million. As a result, pursuant to the provisions of ASC 360 “Property, Plant and Equipment” (“ASC 360”), the unconsolidated joint venture recognized a non-cash impairment loss and loss on sale of real estate aggregating approximately $40.5 million during the year ended December 31, 2011, which is equal to the difference between (1) the sale price less cost to sell and (2) the carrying value of the net assets of the property. Separately, in 2008 we had recognized an impairment loss on our investment in the unconsolidated joint venture totaling approximately $74.3 million under the provisions of ASC 323 “Investments-Equity Method and Joint Ventures” (“ASC 323”). As a result, we recognized a gain on sale of real estate totaling approximately $46.2 million, which is included within income from unconsolidated joint ventures on our Consolidated Statements of Operations.

Interest and Other Income

Interest and other income increased approximately $4.7 million for the year ended December 31, 2012 compared to 2011. Interest income for the year ended December 31, 2012 compared to 2011 increased approximately $1.3 million due primarily to the approximately $0.9 million of interest income that we recognized related to the loans that we made to our Value-Added Fund and an increase in the average cash balance that was partially offset by overall lower interest rates. The loans to the Value-Added Fund have been reflected in Related Party Note Receivable on our Consolidated Financial Statements. The average daily cash balances for the year ended December 31, 2012 and December 31, 2011 were approximately $1.2 billion and $1.1 billion, respectively.

Other income for the year ended December 31, 2012 compared to 2011 increased by approximately $3.4 million of which (1) approximately $2.9 million related to the sale of historic tax credits at our Lofts at Atlantic Wharf, (2) approximately $1.1 million was related to an insurance claim that we received during 2012 and (3) approximately $0.2 million related to a sales deposit we retained due to a prospective buyer of 164 Lexington Road canceling the contract, partially offset by the approximately $0.8 million recognized during 2011 related to 280 Park Avenue (as detailed below). On October 20, 2010, we closed a transaction with a financial institution (the “HTC Investor”) related to the historic rehabilitation of the residential component of our Atlantic Wharf

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development in Boston, Massachusetts (the “residential project”). The HTC Investor has contributed an aggregate of approximately $15 million to the project. As part of its contribution, the HTC Investor will receive substantially all of the benefits derived from the tax credits. Beginning in July 2012 to July 2016, we recognized and will recognize the cash received as revenue over the five-year tax credit recapture period as defined in the Internal Revenue Code. During the year ended December 31, 2012, we recognized approximately $2.9 million of the $15 million that the HTC Investor had contributed to us.

On June 6, 2006, we sold 280 Park Avenue in New York City. In connection with the sale, in lieu of a closing adjustment in favor of the buyer for certain unfunded tenant improvements, we retained the obligation to pay for the improvements, subject to the tenant initiating the request for reimbursement. The total amount of unfunded tenant improvements at closing was approximately $1.0 million and has yet to be requested by the tenants. During the year ended December 31, 2011, a tenant’s lease expired for which we had unfunded tenant improvement liabilities of approximately $0.8 million, resulting in the recognition of other income in that amount.

Gains (Losses) from Investments in Securities

Gains (losses) from investments in securities for the year ended December 31, 2012 and 2011 related to investments that we have made to reduce our market risk relating to a deferred compensation plan that we maintain for our officers. Under this deferred compensation plan, each officer who is eligible to participate is permitted to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. In order to reduce our market risk relating to this plan, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer. This enables us to generally match our liabilities to our officers under the deferred compensation plan with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains (losses) from investments in securities. During the year ended December 31, 2012 and 2011, we recognized gains (losses) of approximately $1.4 million and $(0.4) million, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $1.3 million and $(0.3) million during the year ended December 31, 2012 and 2011, respectively, as a result of increases (decreases) in our liability under our deferred compensation plan that were associated with the performance of the specific investments selected by our officers participating in the plan.

Losses from Early Extinguishments of Debt

Losses from early extinguishments of debt increased by approximately $3.0 million for the year ended December 31, 2012 compared to 2011. This increase is related to the following transactions that occurred during the years ended December 31, 2012 and 2011:

On September 4, 2012, we used available cash to repay the mortgage loan collateralized by our Sumner Square property located in Washington, DC totaling approximately $23.2 million. The mortgage financing bore interest at a fixed rate of 7.35% per annum and was scheduled to mature on September 1, 2013. We recognized a loss on early extinguishment of debt totaling approximately $0.3 million, which included a prepayment penalty totaling approximately $0.2 million associated with the early repayment.

On August 24, 2012, our Operating Partnership used available cash to redeem the remaining $225.0 million in aggregate principal amount of its 6.25% senior notes due 2013. The redemption price was determined in accordance with the applicable indenture and totaled approximately $231.6 million. The redemption price included approximately $1.5 million of accrued and unpaid interest to, but not including, the redemption date. Excluding such accrued and unpaid interest, the redemption price was approximately 102.25% of the principal amount being redeemed. We recognized a loss on early extinguishment of debt totaling approximately $5.2 million, which amount included the payment of the redemption premium totaling approximately $5.1 million.

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On April 2, 2012, we used available cash to repay the mortgage loan collateralized by our One Freedom Square property located in Reston, Virginia totaling $65.1 million. The mortgage financing bore interest at a fixed rate of 7.75% per annum and was scheduled to mature on June 30, 2012. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

On March 12, 2012, we used available cash to repay the mortgage loan collateralized by our Bay Colony Corporate Center property located in Waltham, Massachusetts totaling $143.9 million. The mortgage financing bore interest at a fixed rate of 6.53% per annum and was scheduled to mature on June 11, 2012. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.9 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

In connection with the repurchase and redemption in February 2012 of our Operating Partnership’s 2.875% Exchangeable Senior Notes due 2037, we recognized a loss on early extinguishment of debt of approximately $0.1 million related to the expensing of transaction related costs.

On November 9, 2011, our Operating Partnership repurchased $50.0 million aggregate principal amount of its 2.875% exchangeable senior notes due 2037 for approximately $50.2 million. The repurchased notes had an aggregate carrying value of approximately $49.6 million at the time of repurchase resulting in the recognition of a loss on early extinguishment of debt of approximately $0.6 million.

On November 9, 2011, we used available cash to repay the mortgage loan collateralized by our Reservoir Place property located in Waltham, Massachusetts totaling $50.0 million. The mortgage financing bore interest at a variable rate equal to Eurodollar plus 2.20% per annum and was scheduled to mature on July 30, 2014. There was no prepayment penalty. We recognized a loss from early extinguishment of debt totaling approximately $0.5 million consisting of the write-off of unamortized deferred financing costs.

On November 16, 2011, we terminated the construction loan facility collateralized by our Atlantic Wharf property, located in Boston, Massachusetts, totaling $192.5 million. The construction loan facility bore interest at a variable rate equal to LIBOR plus 3.00% per annum and was scheduled to mature on April 21, 2012 with two, one-year extension options, subject to certain conditions. We did not draw any amounts under the facility. We recognized a loss from early extinguishment of debt totaling approximately $0.4 million consisting of the write-off of unamortized deferred financing costs.

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Interest Expense

Interest expense for the Total Property Portfolio increased approximately $19.4 million for the year ended December 31, 2012 compared to 2011 as detailed below:

Component	Change in  interest expense for the year ended December 31, 2012 compared to December 31, 2011
	(in thousands)
Increases to interest expense due to:
Issuance by our Operating Partnership of $850 million in aggregate principal of 3.700% senior notes due 2018 on November 10, 2011	$	27,213
New mortgages/properties placed in-service/acquisition financings		23,490
Issuance by our Operating Partnership of $1.0 billion in aggregate principal of 3.850% senior notes due 2023 on June 11, 2012		21,501
Decrease in capitalized interest due to properties being placed in-service		3,890
Other interest expense (excluding senior notes) partially offset by principal amortization of continuing debt		853
Total increases to interest expense	$	76,947
Decreases to interest expense due to:
Repayment of mortgage financings	$	(22,468	)
Repurchases/redemption of $576.2 million in aggregate principal of 2.875% exchangeable senior notes due 2037		(17,912	)
Interest expense associated with the accretion of the adjustment for the equity component allocation of our unsecured exchangeable debt		(9,734	)
Redemption of $225.0 million in aggregate principal of 6.25% unsecured senior notes due 2013		(6,136	)
Interest on our Operating Partnership’s Unsecured Line of Credit		(1,260	)
Total decreases to interest expense	$	(57,510	)
Total change in interest expense	$	19,437

The following properties are included in the new mortgages/properties placed in-service/acquisition financings line item: 601 Lexington Avenue and Fountain Square. The following properties are included in the repayment of mortgage financings line item: 601 Lexington Avenue, Reservoir Place, Atlantic Wharf, 510 Madison Avenue, Bay Colony Corporate Center, One Freedom Square and Sumner Square. Included within the interest on our Operating Partnership’s Unsecured Line of Credit line item is the interest expense associated with our borrowing that had been secured by 601 Lexington Avenue. As properties are placed in-service, we cease capitalizing interest and interest is then expensed.

Interest expense directly related to the development of rental properties is not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Interest capitalized for the year ended December 31, 2012 and 2011 was approximately $44.3 million and $48.2 million, respectively. These costs are not included in the interest expense referenced above.

At December 31, 2012, our variable rate debt consisted of our Operating Partnership’s $750.0 million Unsecured Line of Credit, of which no amount was outstanding at December 31, 2012.

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Discontinued Operations

On May 17, 2012, we completed the sale of our Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash. Net cash proceeds totaled approximately $62.0 million, resulting in a gain on sale of approximately $36.9 million. Bedford Business Park is comprised of two Office/Technical buildings and one Class A office building aggregating approximately 470,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented. Refer to Note 3 of the Consolidated Financial Statements for additional details regarding the sale and operating results.

Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships increased by approximately $2.2 million for the year ended December 31, 2012 compared to 2011. Noncontrolling interests in property partnerships consisted of the outside owners’ equity interest in the income from our 505 9^th Street and Fountain Square properties as of December 31, 2012 and only 505 9^th Street as of December 31, 2011.

On October 4, 2012, we completed the formation of a joint venture which owns and operates Fountain Square located in Reston, Virginia, adjacent to our other Reston properties. Fountain Square is an office and retail complex aggregating approximately 756,000 net rentable square feet, comprised of approximately 522,000 net rentable square feet of Class A office space and approximately 234,000 net rentable square feet of retail space. The joint venture partner contributed the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a 50% interest in the joint venture. We contributed cash totaling approximately $87.0 million for our 50% interest, which cash was distributed to the joint venture partner. We are consolidating this joint venture. The mortgage loan bears interest at a fixed rate of 5.71% per annum and matures on October 11, 2016. Pursuant to the joint venture agreement (i) we have rights to acquire the partner’s 50% interest and (ii) the partner has the right to cause us to acquire the partner’s interest on January 4, 2016, in each case at a fixed price totaling approximately $102.0 million in cash. The fixed price option rights expire on January 31, 2016.

Noncontrolling Interest—Common Units of the Operating Partnership

Noncontrolling interest-common units of the Operating Partnership decreased by approximately $5.0 million for the year ended December 31, 2012 compared to 2011 due to a decrease in allocable income and a decrease in the noncontrolling interest’s ownership percentage.

Liquidity and Capital Resources

General

Our principal liquidity needs for the next twelve months and beyond are to:

• fund normal recurring expenses;

• meet debt service and principal repayment obligations, including balloon payments on maturing debt;

• fund capital expenditures, including major renovations, tenant improvements and leasing costs;

• fund development costs;

• fund possible property acquisitions; and

• make the minimum distribution required to maintain our REIT qualification under the Internal Revenue Code of 1986, as amended.

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We expect to satisfy these needs using one or more of the following:

• cash flow from operations;

• distribution of cash flows from joint ventures;

• cash and cash equivalent balances;

• issuances of our equity securities and/or additional preferred or common units of partnership interest in our Operating Partnership;

• our Operating Partnership’s Unsecured Line of Credit or other short-term bridge facilities;

• construction loans;

• long-term secured and unsecured indebtedness (including unsecured exchangeable indebtedness); and

• sales of real estate.

We draw on multiple financing sources to fund our long-term capital needs. Our Operating Partnership’s Unsecured Line of Credit is utilized primarily as a bridge facility to fund acquisition opportunities, refinance outstanding indebtedness and meet short-term development and working capital needs. Although we generally seek to fund our development projects with construction loans, which may be guaranteed by our Operating Partnership, the financing for each particular project ultimately depends on several factors, including, among others, the project’s size and duration, the extent of pre-leasing and our available cash and access to cost effective capital at the given time.

The following table presents information on properties under construction as of December 31, 2013 (dollars in thousands):

Construction Properties	Estimated Stabilization Date	Location	# of Buildings		Square feet		Investment to Date(1)		Estimated  Total Investment(1)		Percentage Leased(2)
Office
Annapolis Junction Building Seven (50% ownership) (3)	First Quarter, 2015	Annapolis, MD		1		125,000	$	11,580	$	17,500		100	%
680 Folsom Street (4)	Third Quarter, 2015	San Francisco, CA		2		524,509		279,923		340,000		96	%
250 West 55th Street(5)	Fourth Quarter, 2015	New York, NY		1		989,000		840,317		1,050,000		61	%
804 Carnegie Center	First Quarter, 2016	Princeton, NJ		1		130,000		1,970		40,410		100	%
535 Mission Street	Third Quarter, 2016	San Francisco, CA		1		307,000		113,275		215,000		—	%
601 Massachusetts Avenue	Fourth Quarter, 2017	Washington, DC		1		478,000		155,310		360,760		79	%
Transbay Tower (95% ownership) (6)	N/A	San Francisco, CA		1		N/A		244,082		340,000		N/A
Total Office Properties under Construction				8		2,553,509	$	1,646,457	$	2,363,670		68	%
Residential
The Avant at Reston Town Center (359 units) (7)	Fourth Quarter, 2015	Reston, VA		1		355,327	$	109,194	$	137,250		21	%
Total Properties under Construction				9		2,908,836	$	1,755,651	$	2,500,920		63	%

(1) Represents our share. Includes net revenue during lease up period, acquisition expenses and approximately $53.9 million of construction cost and leasing commission accruals.

(2) Represents percentage leased as of February 21, 2014, includes leases with future commencement dates.

(3) This development project has a construction loan.

(4) As of February 21, 2014, this property was 1% placed in-service.

(5) Investment to Date excludes approximately $24.8 million of costs that were expensed in prior periods in connection with the suspension of development activities. Estimated Total Investment includes approximately $230 million of interest capitalization. As of February 21, 2014, this property was 6% placed in-service.

(6) On March 26, 2013, the joint venture completed the acquisition of a land parcel in San Francisco which will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The Estimated Total Investment represents only the cost to build to grade.

(7) The square footage amount includes approximately 26,000 square feet of retail space that is 100% leased. As of February 21, 2014, this property was fully placed in-service.

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Contractual rental revenue, recoveries from tenants, other income from operations, available cash balances and draws on our Operating Partnership’s Unsecured Line of Credit are our principal sources of capital used to pay operating expenses, debt service, recurring capital expenditures and the minimum distribution required to enable us to maintain our REIT qualification. We seek to maximize income from our existing properties by maintaining quality standards for our properties that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling operating expenses. Our sources of revenue also include third-party fees generated by our property management, leasing, and development and construction businesses, as well as the sale of assets from time to time. We believe our revenue, together with our cash balances and proceeds from financing activities, will continue to provide the necessary funds for our short-term liquidity needs.

Material adverse changes in one or more sources of capital may adversely affect our net cash flows. Such changes, in turn, could adversely affect our ability to fund dividends and distributions, debt service payments and tenant improvements. In addition, a material adverse change in the cash provided by our operations may affect our ability to comply with the financial covenants under our Operating Partnership’s Unsecured Line of Credit and unsecured senior notes.

Since January 1, 2013, we raised net proceeds of approximately $1.4 billion in the capital markets. Specifically, we issued $200 million of 5.25% Series B Cumulative Redeemable Preferred Stock, and our Operating Partnership issued $500 million aggregate principal amount of 3.125% senior unsecured notes due 2023 and $700 million aggregate principal amount of 3.800% senior unsecured notes due 2024. In addition, we repaid approximately $65 million of secured debt, and we redeemed/repurchased our Operating Partnership’s $450 million 3.75% exchangeable senior notes due 2036 and repaid $747.5 million of our Operating Partnership’s 3.625% exchangeable senior notes due February 2014 and our Operating Partnership redeemed 861,400 Series Four Preferred Units at a redemption price of $50.00 per unit plus accrued and unpaid distributions. In addition, we refinanced the loans secured by 540 Madison Avenue and 500 North Capitol Street, which aggregate approximately $225 million (of which our share is approximately $104 million), obtained $22 million of construction financing for our Annapolis Junction Building Seven development project and exercised an option to extend the maturity date on an approximately $14 million loan for our Annapolis Junction Building Six property (of which our share is approximately $7 million). On July 26, 2013, our Operating Partnership amended and restated the revolving credit agreement governing its Unsecured Line of Credit, which, among other things, (1) increased the total commitment from $750.0 million to $1.0 billion, (2) extended the maturity date from June 24, 2014 to July 26, 2018 and (3) reduced per annum variable rates and other fees.

The completion of our ongoing developments, through 2017, has remaining costs to fund of approximately $0.7 billion. We have approximately $77 million of secured debt (of which our share is approximately $70 million) expiring through the end of 2014. We believe that our strong liquidity, including available cash as of February 21, 2014 of approximately $0.9 billion, the approximately $989.4 million available under our Operating Partnership’s Unsecured Line of Credit and proceeds from potential asset sales provide sufficient capacity to meet our debt obligations and fund our remaining capital requirements on existing development projects, our foreseeable potential development activity and pursue additional attractive investment opportunities. Given the relatively low interest rates currently available to us in the debt markets, we may seek to enhance our liquidity in the future, which may result in us carrying additional cash and cash equivalents pending our Operating Partnership’s use of the proceeds. In order to reduce future cash interest payments, as well as future amounts due at maturity or upon redemption, we may, from time to time, purchase unsecured senior notes and unsecured exchangeable senior notes for cash in open market purchases or privately negotiated transactions, or both. We will evaluate any such potential transactions in light of then-existing market conditions, taking into account the trading prices of the notes, our current liquidity and prospects for future access to capital.

REIT Tax Distribution Considerations

Dividend

As a REIT we are subject to a number of organizational and operational requirements, including a requirement that we currently distribute at least 90% of our annual taxable income. Our policy is to distribute at

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least 100% of our taxable income to avoid paying federal tax. On December 2, 2013, we announced that our Board of Directors declared a special cash dividend of $2.25 per common share payable on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013. The decision to declare a special dividend was primarily a result of the sale of a 45% interest in our Times Square Tower property in October 2013. The Board of Directors did not make any change in our policy with respect to regular quarterly dividends. Holders of common units of limited partnership interest in Boston Properties Limited Partnership, our Operating Partnership, as of the close of business on December 31, 2013 received the same distribution on January 29, 2014. On November 8, 2012, our Board of Directors increased our quarterly dividend from $0.55 per common share to $0.65 per common share. Our Board of Directors will continue to evaluate our dividend rate in light of our actual and projected taxable income, liquidity requirements and other circumstances, and there can be no assurance that the future dividends declared by our Board of Directors will not differ materially.

Sales

To the extent that we sell assets at a gain and cannot efficiently use the proceeds in a tax deferred manner for either our development activities or attractive acquisitions, we would, at the appropriate time, decide whether it is better to declare a special dividend, adopt a stock repurchase program, reduce our indebtedness or retain the cash for future investment opportunities. Such a decision will depend on many factors including, among others, the timing, availability and terms of development and acquisition opportunities, our then-current and anticipated leverage, the cost and availability of capital from other sources, the price of our common stock and REIT distribution requirements. At a minimum, we expect that we would distribute at least that amount of proceeds necessary for us to avoid paying corporate level tax on the applicable gains realized from any asset sales.

Cash Flow Summary

The following summary discussion of our cash flows is based on the Consolidated Statements of Cash Flows and is not meant to be an all-inclusive discussion of the changes in our cash flows for the periods presented below.

Cash and cash equivalents were approximately $2.4 billion and $1.0 billion at December 31, 2013 and 2012, respectively, representing an increase of approximately $1.4 billion. The following table sets forth changes in cash flows:

	Year ended December 31,
	2013			2012			Increase (Decrease)
	(in thousands)
Net cash provided by operating activities	$	777,926		$	642,949		$	134,977
Net cash used in investing activities		(532,640	)		(1,278,032	)		745,392
Net cash provided by (used in) financing activities		1,077,873			(146,147	)		1,224,020

Our principal source of cash flow is related to the operation of our office properties. The average term of our in-place tenant leases, including our unconsolidated joint ventures, is approximately 6.6 years with occupancy rates historically in the range of 91% to 94%. Our properties generate a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service and fund quarterly dividend and distribution payment requirements. In addition, over the past several years, we have raised capital through the sale of some of our properties, secured and unsecured borrowings and equity offerings.

Cash is used in investing activities to fund acquisitions, development, net investments in unconsolidated joint ventures and recurring and nonrecurring capital expenditures. We selectively invest in new projects that enable us to take advantage of our development, leasing, financing and property management skills and invest in existing buildings to enhance or maintain their market position. Cash used in investing activities for the year ended December 31, 2013 and 2012 consisted primarily of funding our development projects and the acquisitions

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of 453 Ravendale Drive, 100 Federal Street, Fountain Square, 680 Folsom Street, 535 Mission Street and the Mountain View Research and Technology Parks and the Transbay Tower and Reston, Virginia land parcels, offset by cash from the disposition of 10 & 20 Burlington Mall Road, One Preserve Parkway, 1301 New York Avenue, 303 Almaden Boulevard and Bedford Business Park, as detailed below:

	Year ended December 31,
	2013			2012
	(in thousands)
Acquisitions of real estate	$	(522,900	)	$	(788,052	)
Construction in progress		(396,835	)		(356,397	)
Building and other capital improvements		(73,821	)		(49,943	)
Tenant improvements		(105,425	)		(139,662	)
Proceeds from sales of real estate		250,078			61,963
Cash recorded upon consolidation		79,468			—
Issuance of notes receivable, net		12,491			(2,049	)
Capital contributions to unconsolidated joint ventures		—			(6,214	)
Capital distributions from unconsolidated joint ventures		225,862			3,557
Investments in securities, net		(1,558	)		(1,235	)
Net cash used in investing activities	$	(532,640	)	$	(1,278,032	)

Cash used in investing activities changed primarily due to the following:

• On March 1, 2012, we acquired 453 Ravendale Drive located in Mountain View, California for a purchase price of approximately $6.7 million in cash.

• On March 13, 2012, we acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash.

• On August 29, 2012, we acquired the development project located at 680 Folsom Street in San Francisco, California. The consideration paid by us to the seller consisted of approximately $62.2 million in cash.

• On October 4, 2012, we completed the formation of a consolidated joint venture which owns and operates Fountain Square located in Reston, Virginia for an aggregate cash investment from us of approximately $100.0 million.

• On February 6, 2013, we completed the acquisition of 535 Mission Street, a development site, in San Francisco, California for an aggregate purchase price of approximately $71.0 million in cash, including work completed and materials purchased to date.

• On March 26, 2013, the consolidated joint venture in which we have a 95% interest completed the acquisition of a land parcel in San Francisco, California which will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The purchase price for the land was approximately $192.0 million.

• On March 29, 2013, we completed the acquisition of a parcel of land located in Reston, Virginia for a purchase price of approximately $27.0 million. The land parcel is commercially zoned for 250,000 square feet of office space.

• On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from our Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. Mountain View Research Park is a 16-building complex of Office/Technical properties aggregating approximately 604,000 net rentable square feet. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet.

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• Construction in progress for the year ended December 31, 2012 includes expenditures associated with our 510 Madison Avenue and One Patriots Park developments, which were fully placed in-service during the year ended December 31, 2012. In addition, we incurred costs associated with the continued development and redevelopment of Two Patriots Park, Seventeen Cambridge Center, The Avant at Reston Town Center, the Cambridge Center Connector, 250 West 55^th Street and 680 Folsom Street. Construction in progress for the year ended December 31, 2013 includes ongoing expenditures associated with our Two Patriots Park and Seventeen Cambridge Center properties and the Cambridge Center Connector, which were fully placed in-service during the year ended December 31, 2013. In addition, we incurred costs associated with our continued development of The Avant at Reston Town Center, 250 West 55th Street, 680 Folsom Street, 535 Mission Street, 601 Massachusetts Avenue, 804 Carnegie Center and Transbay Tower.

• Our capital expenditures for the year ended December 31, 2013 and 2012 were approximately $73.6 million and $47.0 million, respectively. Included in our 2013 amount is approximately $15.8 million of non-recurring capital expenditures related to our repositioning of Bay Colony Corporate Center in Waltham, Massachusetts.

• Tenant improvement costs decreased by approximately $34.2 million due to the completion of large tenant projects in 2012.

• On May 17, 2012, we completed the sale of our Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash. Net cash proceeds totaled approximately $62.0 million.

• On June 28, 2013, we completed the sale of our 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. Net cash proceeds totaled approximately $39.3 million.

• On August 22, 2013, we completed the sale of our 1301 New York Avenue property located in Washington, DC for a net contract sale price of approximately $121.7 million. After adjusting for outstanding lease and other transaction costs assumed by the buyer, the gross sale price was approximately $135.0 million. Net cash proceeds totaled approximately $121.5 million.

• On December 20, 2013, we completed the sale of our 10 & 20 Burlington Mall Road property located in Burlington, Massachusetts for a sale price of approximately $30.0 million. Net cash proceeds totaled approximately $29.4 million.

• On December 20, 2013, we completed the sale of our One Preserve Parkway property located in Rockville, Maryland for a sale price of approximately $61.3 million. Net cash proceeds totaled approximately $59.9 million, resulting in a gain on sale of approximately $5.9 million.

• We recorded approximately $79.5 million of cash upon consolidating the joint venture that owns 767 Fifth Avenue (the General Motors Building) (See Note 3 to the Consolidated Financial Statements).

• Capital distributions from unconsolidated joint ventures increased by approximately $222.3 million due to the sale of the Eighth Avenue and 46th Street project and 125 West 55th Street in New York City and the Value-Added Fund selling Mountain View Research and Technology Parks.

Cash provided by financing activities for the year ended December 31, 2013 totaled approximately $1.1 billion. This consisted primarily of us selling a 45% ownership interest in our Time Square Tower building in New York City, us issuing $200 million of 5.25% Series B Cumulative Redeemable Preferred Stock, the issuance by our Operating Partnership of $500 million aggregate principal amount of 3.125% senior unsecured notes due 2023 and the issuance by our Operating Partnership of $700 million aggregate principal amount of 3.800% senior unsecured notes due 2024, partially offset by the redemption of our Operating Partnership’s $450 million 3.75% exchangeable senior notes due 2036, which were redeemable in May 2013, the redemption of Series Four Preferred Units, the payments of dividends and distributions to our shareholders and the unitholders of our Operating Partnership and the repayment of mortgage notes payable. Future debt payments are discussed below under the heading “Capitalization—Debt Financing.”

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Capitalization

At December 31, 2013, our total consolidated debt was approximately $11.3 billion. The GAAP weighted-average annual interest rate on our consolidated indebtedness was 4.60% (with a coupon/stated rate of 4.93%) and the weighted-average maturity was approximately 5.4 years.

Consolidated debt to total consolidated market capitalization ratio, defined as total consolidated debt as a percentage of the value of our outstanding equity securities plus our total consolidated debt, is a measure of leverage commonly used by analysts in the REIT sector. Our total consolidated market capitalization was approximately $28.7 billion at December 31, 2013. Our total consolidated market capitalization was calculated using the December 31, 2013 closing stock price of $100.37 per common share and the following: (1) 152,983,101 shares of our common stock, (2) 15,583,370 outstanding common units of partnership interest in our Operating Partnership (excluding common units held by us), (3) an aggregate of 874,168 common units issuable upon conversion of all outstanding Series Two Preferred Units of partnership interest in our Operating Partnership, (4) an aggregate of 1,455,761 common units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, (5) 360,126 Series Four Preferred Units of partnership interest in our Operating Partnership multiplied by the fixed liquidation preference of $50 per unit, (6) 80,000 shares (8,000,000 depositary shares, each representing 1/100th of a share), of our 5.25% Series B Cumulative Redeemable Preferred Stock, at a price of $2,500 per share ($25 per depositary share) and (7) our consolidated debt totaling approximately $11.3 billion. Our total consolidated debt, which excludes debt collateralized by our unconsolidated joint ventures, at December 31, 2013, represented approximately 39.50% of our total consolidated market capitalization.

Following the consolidation of 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building)), effective June 1, 2013, our consolidated debt increased significantly compared to prior periods even though our economic interest in 767 Venture, LLC remained substantially unchanged. As a result, we believe the presentation of total adjusted debt may provide investors with a more complete picture of our share of consolidated and unconsolidated debt. Total adjusted debt is defined as our total consolidated debt, plus our share of unconsolidated joint venture debt, minus our joint venture partners’ share of consolidated debt, and was approximately $10.8 billion at December 31, 2013. In addition, in light of the difference between our total consolidated debt and our total adjusted debt, we believe that also presenting our total adjusted debt to total adjusted market capitalization ratio may provide investors with a more complete picture of our leverage in relation to the overall size of our company. The calculation of the total adjusted debt to total adjusted market capitalization ratio is the same as consolidated debt to total consolidated market capitalization ratio except that the total adjusted debt balance is used in lieu of the total consolidated debt balance. Our total adjusted debt at December 31, 2013, represented approximately 38.31% of our total adjusted market capitalization.

The calculation of total consolidated and adjusted market capitalization does not include 396,500 2011 OPP Units, 396,150 2012 OPP Units and 316,325 2013 MYLTIP Units because, unlike other LTIP Units, they are not earned until certain return thresholds are achieved. These percentages will fluctuate with changes in the market value of our common stock and does not necessarily reflect our capacity to incur additional debt to finance our activities or our ability to manage our existing debt obligations. However, for a company like ours, whose assets are primarily income-producing real estate, the consolidated debt to total consolidated market capitalization ratio and the adjusted debt to total adjusted market capitalization ratio may provide investors with an alternate indication of leverage, so long as it is evaluated along with other financial ratios and the various components of our outstanding indebtedness.

For a discussion of our unconsolidated joint venture indebtedness, see “Liquidity and Capital Resources—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness” within “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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Debt Financing

As of December 31, 2013, we had approximately $11.3 billion of outstanding consolidated indebtedness, representing approximately 39.50% of our total consolidated market capitalization as calculated above consisting of approximately (1) $5.836 billion (net of discount) in publicly traded unsecured senior notes (excluding exchangeable senior notes) having a weighted-average interest rate of 4.44% per annum and maturities in 2015, 2018, 2019, 2020, 2021, 2023 and 2024; (2) $744.9 million (net of discount and the adjustment for the equity component allocation) of exchangeable senior notes having a GAAP interest rate of 6.555% per annum (an effective rate of 4.037%, excluding the effect of the adjustment for the equity component allocation) and maturing in 2014; (3) $4.4 billion of property-specific mortgage debt having a GAAP weighted-average interest rate of 4.31% per annum and weighted-average term of 4.2 years and (4) $0.3 million of mezzanine notes payable associated with 767 Fifth Avenue (the General Motors Building), having a GAAP interest rate of 5.53% per annum and maturing in 2017. The table below summarizes our mortgage and mezzanine notes payable, our unsecured senior notes and our Unsecured Line of Credit at December 31, 2013 and December 31, 2012:

	2013			2012
	(Dollars in thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable	$	4,449,734		$	3,102,485
Variable rate mortgage notes payable		—			—
Unsecured senior notes, net of discount		5,835,854			4,639,528
Unsecured exchangeable senior notes, net of discount and adjustment for the equity component allocation		744,880			1,170,356
Unsecured Line of Credit		—			—
Mezzanine notes payable		311,040			—
Total	$	11,341,508		$	8,912,369
Percent of total debt:
Fixed rate		100.00	%		100.00	%
Variable rate		—	%		—	%
Total		100.00	%		100.00	%
GAAP Weighted-average interest rate at end of period:
Fixed rate		4.60	%		5.13	%
Variable rate		—	%		—	%
Total		4.60	%		5.13	%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate		4.93	%		4.89	%
Variable rate		—	%		—	%
Total		4.93	%		4.89	%

Unsecured Line of Credit

On July 26, 2013, our Operating Partnership amended and restated the revolving credit agreement governing its Unsecured Line of Credit, which, among other things, (1) increased the total commitment from $750.0 million to $1.0 billion, (2) extended the maturity date from June 24, 2014 to July 26, 2018 and (3) reduced the per annum variable interest rates and other fees. Our Operating Partnership may increase the total commitment to $1.5 billion, subject to syndication of the increase and other conditions. At our Operating Partnership’s option, loans outstanding under the Unsecured Line of Credit will bear interest at a rate per annum equal to (1), in the case of loans denominated in Dollars, Euro or Sterling, LIBOR or, in the case of loans denominated in Canadian Dollars,

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CDOR, in each case, plus a margin ranging from 0.925% to 1.70% based on our Operating Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Administrative Agent’s prime rate, (b) the Federal Funds rate plus 0.5% or (c) LIBOR for a one month period plus 1.00%, in each case, plus a margin ranging from 0.0% to 0.70% based on our Operating Partnership’s credit rating. The Unsecured Line of Credit also contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loan advances to our Operating Partnership at a reduced interest rate. In addition, our Operating Partnership is also obligated to pay (1) in quarterly installments a facility fee on the total commitment at a rate per annum ranging from 0.125% to 0.35% based on our Operating Partnership’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit equal to the LIBOR margin. Based on our Operating Partnership’s current credit rating, the LIBOR and CDOR margin is 1.00%, the alternate base rate margin is 0.0% and the facility fee is 0.15%. Our ability to borrow under our Operating Partnership’s Unsecured Line of Credit is subject to our compliance with a number of customary financial and other covenants on an ongoing basis, including:

• a leverage ratio not to exceed 60%, however the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year;

• a secured debt leverage ratio not to exceed 55%;

• a fixed charge coverage ratio of at least 1.40;

• an unsecured leverage ratio not to exceed 60%, however the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year;

• an unsecured debt interest coverage ratio of at least 1.75; and

• limitations on permitted investments.

We believe we are in compliance with the financial and other covenants listed above.

As of December 31, 2013, we had no borrowings and outstanding letters of credit totaling approximately $10.6 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $989.4 million. As of February 21, 2014, we had no borrowings and outstanding letters of credit totaling approximately $10.6 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $989.4 million.

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Principal Amount			Maturity Date(2)
12 Year Unsecured Senior Notes		5.625	%		5.693	%	$	300,000			April 15, 2015
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000			June 1, 2015
10 Year Unsecured Senior Notes		5.875	%		5.967	%		700,000			October 15, 2019
10 Year Unsecured Senior Notes		5.625	%		5.708	%		700,000			November 15, 2020
10 Year Unsecured Senior Notes		4.125	%		4.289	%		850,000			May 15, 2021
7 Year Unsecured Senior Notes		3.700	%		3.853	%		850,000			November 15, 2018
11 Year Unsecured Senior Notes		3.850	%		3.954	%		1,000,000			February 1, 2023
10.5 Year Unsecured Senior Notes		3.125	%		3.279	%		500,000			September 1, 2023
10.5 Year Unsecured Senior Notes		3.800	%		3.916	%		700,000			February 1, 2024
Total principal								5,850,000
Net unamortized discount								(14,146	)
Total							$	5,835,854

(1) Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.

(2) No principal amounts are due prior to maturity.

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Our unsecured senior notes are redeemable at our option, in whole or in part, at a redemption price equal to the greater of (1) 100% of their principal amount or (2) the sum of the present value of the remaining scheduled payments of principal and interest discounted at a rate equal to the yield on U.S. Treasury securities with a comparable maturity plus 35 basis points (or 20 basis points in the case of the $500 million of notes that mature on September 1, 2023, 25 basis points in the case of the $250 million and $700 million of notes that mature on June 1, 2015 and February 1, 2024, respectively, 40 basis points in the case of the $700 million of notes that mature on October 15, 2019 and 30 basis points in the case of the $700 million and $850 million of notes that mature on November 15, 2020 and May 15, 2021, respectively), in each case plus accrued and unpaid interest to the redemption date. The indenture under which our unsecured senior notes were issued contains restrictions on incurring debt and using our assets as security in other financing transactions and other customary financial and other covenants, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) unencumbered asset value to be no less than 150% of our unsecured debt. As of December 31, 2013, we believe we were in compliance with each of these financial restrictions and requirements.

Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Exchange Rate			Principal Amount			First Optional Redemption  Date by Company	Maturity Date
3.625% Exchangeable Senior Notes		3.625	%		4.037	%		8.6974	(2)	$	747,500		N/A	February 15, 2014
Net unamortized discount											(182	)
Adjustment for the equity component allocation, net of accumulated amortization											(2,438	)
Total										$	744,880

(1) Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of our common stock). In addition, we entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to us of the notes from $117.58 to approximately $137.17 per share (subject to adjustment), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of our common stock. The net cost of the capped call transactions was approximately $44.4 million. In connection with the special dividend declared on November 27, 2013, the exchange rate of 8.5051 was adjusted to 8.6974 shares per $1,000 principal amount of notes effective as of December 31, 2013, resulting in an exchange price of approximately $114.98 per share of our common stock. As of December 31, 2013, the effective exchange price was $130.21 per share. Our Operating Partnership repaid the notes on February 18, 2014 (Refer to Note 20 of the Consolidated Financial Statements).

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Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at December 31, 2013:

Properties	Stated Interest  Rate			GAAP Interest  Rate(1)			Stated Principal Amount		Historical Fair Value Adjustment		Carrying Amount			Maturity Date
	(Dollars in thousands)
767 Fifth Avenue (the General Motors Building)		5.95	%		2.44	%	$	1,300,000	$	163,143	$	1,463,143	(1)(2)(3)(4)		October 7, 2017
599 Lexington Avenue		5.57	%		5.41	%		750,000		—		750,000	(4)(5)		March 1, 2017
601 Lexington Avenue		4.75	%		4.79	%		722,253		—		722,253			April 10, 2022
John Hancock Tower		5.68	%		5.05	%		640,500		12,433		652,933	(1)(4)(6)		January 6, 2017
Embarcadero Center Four		6.10	%		7.02	%		360,133		—		360,133	(7)		December 1, 2016
Fountain Square		5.71	%		2.56	%		211,250		15,354		226,604	(1)(4)(8)		October 11, 2016
505 9th Street		5.73	%		5.87	%		121,360		—		121,360	(8)		November 1, 2017
New Dominion Tech Park, Bldg. Two		5.55	%		5.58	%		63,000		—		63,000	(4)		October 1, 2014
New Dominion Tech Park, Bldg. One		7.69	%		7.84	%		43,278		—		43,278			January 15, 2021
Kingstowne Two and Retail		5.99	%		5.61	%		33,064		274		33,338	(1)		January 1, 2016
University Place		6.94	%		6.99	%		13,692		—		13,692			August 1, 2021
Total							$	4,258,530	$	191,204	$	4,449,734

(1) GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges, effects of hedging transactions and adjustments required to reflect loans at their fair values upon acquisition. All adjustments to reflect loans at their fair value upon acquisition are noted above.

(2) This property is owned by a consolidated joint venture in which we have a 60% interest.

(3) In connection with the assumption of the loan, we guaranteed the joint venture’s obligation to fund various escrows, including tenant improvements, taxes and insurance in lieu of cash deposits. As of December 31, 2013, the maximum funding obligation under the guarantee was approximately $24.1 million. We earn a fee from the joint venture for providing the guarantee and have an agreement with our partners to reimburse the joint venture for their share of any payments made under the guarantee.

(4) The mortgage loan requires interest only payments with a balloon payment due at maturity.

(5) On December 19, 2006, we terminated the forward-starting interest rate swap contracts related to this financing and received approximately $10.9 million, which amount is reducing our GAAP interest expense for this mortgage over the term of the financing, resulting in an effective interest rate of 5.41% per annum for the financing. The stated interest rate is 5.57% per annum.

(6) In connection with the mortgage financing we have agreed to guarantee approximately $15.9 million related to our obligation to provide funds for certain tenant re-leasing costs.

(7) On November 13, 2008, we closed on an eight-year, $375.0 million mortgage loan collateralized by this property. The mortgage loan bears interest at a fixed rate of 6.10% per annum. Under our interest rate hedging program, we are reclassifying into earnings over the eight-year term of the loan as an increase in interest expense approximately $26.4 million (approximately $3.3 million per year) of the amounts recorded on our Consolidated Balance Sheets within Accumulated Other Comprehensive Loss resulting in an effective interest rate of 7.02% per annum.

(8) This property is owned by a consolidated joint venture in which we have a 50% interest.

Contractual aggregate principal payments of mortgage notes payable at December 31, 2013 are as follows:

Year	Principal Payments
	(in thousands)
2014	$	87,759
2015		26,182
2016		608,879
2017		2,821,750
2018		18,633
Thereafter		695,327

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Mezzanine Notes Payable

The following represents the outstanding principal balances due under the mezzanine notes payable at December 31, 2013:

Property Debt is Associated With	Stated Interest  Rate			GAAP Interest  Rate(1)			Stated Principal Amount		Historical Fair Value Adjustment		Carrying Amount	Maturity Date
							(Dollars in thousands)
767 Fifth Avenue (the General Motors Building)		6.02	%		5.53	%	$	306,000	$	5,040	$311,040(1)(2)(3)		October 7, 2017

(1) GAAP interest rate differs from the stated interest rate due to adjustments required to reflect loans at their fair values upon acquisition or consolidation. All adjustments to reflect loans at their fair value upon acquisition are noted above.

(2) This property is owned by a consolidated joint venture in which we have a 60% interest.

(3) The mortgage loan requires interest only payments with a balloon payment due at maturity.

Outside Members’ Notes Payable

In conjunction with the consolidation of 767 Fifth Avenue (the General Motors Building), we recorded loans payable to the joint venture’s partners totaling $450.0 million and related accrued interest payable totaling approximately $175.8 million. The member loans bear interest at a fixed rate of 11.0% per annum and mature on June 9, 2017. We have eliminated in consolidation our member loan totaling $270.0 million and our share of the related accrued interest payable of approximately $114.5 million at December 31, 2013. The remaining notes payable to the outside joint venture partners and related accrued interest payable totaling $180.0 million and approximately $76.4 million as of December 31, 2013 have been reflected as Outside Members’ Notes Payable and within Accrued Interest Payable, respectively, on our Consolidated Balance Sheets. The related interest expense from the Outside Members’ Notes Payable totaling approximately $16.0 million for the period from May 31, 2013 through December 31, 2013 is fully allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations.

Market Risk

Market risk is the risk of loss from adverse changes in market prices and interest rates. Our future earnings, cash flows and fair values relevant to financial instruments are dependent upon prevalent market interest rates. Our primary market risk results from our indebtedness, which bears interest at fixed and variable rates. The fair value of our debt obligations are affected by changes in the market interest rates. We manage our market risk by matching long-term leases with long-term, fixed-rate, non-recourse debt of similar duration. We continue to follow a conservative strategy of generally pre-leasing development projects on a long-term basis to creditworthy tenants in order to achieve the most favorable construction and permanent financing terms. All of our outstanding debt, excluding our unconsolidated joint ventures, has fixed interest rates, which minimizes the interest rate risk through the maturity of such outstanding debt. We also manage our market risk by entering into hedging arrangements with financial institutions. Our primary objectives when undertaking hedging transactions and derivative positions is to reduce our floating rate exposure and to fix a portion of the interest rate for anticipated financing and refinancing transactions. This in turn, reduces the risks that the variability of cash flows imposes on variable rate debt. Our strategy mitigates against future increases in our interest rates.

At December 31, 2013 our weighted-average coupon/stated rate on all of our outstanding debt, all of which had a fixed interest rate, was 4.93% per annum. At December 31, 2013, we had no outstanding variable rate debt. The weighted-average coupon/stated rate for our senior notes and unsecured exchangeable debt was 4.44% and 3.63%, respectively.

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Funds from Operations

Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of NAREIT, we calculate Funds from Operations, or FFO, by adjusting net income (loss) attributable to Boston Properties, Inc. (computed in accordance with GAAP, including non-recurring items) for gains (or losses) from sales of properties, impairment losses on depreciable real estate of consolidated real estate, impairment losses on investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures, real estate related depreciation and amortization, and after adjustment for unconsolidated partnerships, joint ventures and preferred distributions. FFO is a non-GAAP financial measure. The use of FFO, combined with the required primary GAAP presentations, has been fundamentally beneficial in improving the understanding of operating results of REITs among the investing public and making comparisons of REIT operating results more meaningful. Management generally considers FFO to be a useful measure for reviewing our comparative operating and financial performance because, by excluding gains and losses related to sales of previously depreciated operating real estate assets, impairment losses on depreciable real estate of consolidated real estate, impairment losses on investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures and excluding real estate asset depreciation and amortization (which can vary among owners of identical assets in similar condition based on historical cost accounting and useful life estimates), FFO can help one compare the operating performance of a company’s real estate between periods or as compared to different companies. Our computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently. Amount represents our share, which was 89.99%, 89.48%, 88.57%, 87.25% and 86.57% for the years ended December 31, 2013, 2012, 2011, 2010 and 2009, respectively, after allocation to the noncontrolling interests in the Operating Partnership.

FFO should not be considered as an alternative to net income attributable to Boston Properties, Inc. (determined in accordance with GAAP) as an indication of our performance. FFO does not represent cash generated from operating activities determined in accordance with GAAP and is not a measure of liquidity or an indicator of our ability to make cash distributions. We believe that to further understand our performance, FFO should be compared with our reported net income attributable to Boston Properties, Inc. and considered in addition to cash flows in accordance with GAAP, as presented in our Consolidated Financial Statements.

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The following table presents a reconciliation of net income attributable to Boston Properties, Inc. to FFO and FFO, as adjusted, for the years ended December 31, 2013, 2012, 2011, 2010 and 2009:

	Year ended December 31,
	2013			2012			2011			2010			2009
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	741,754		$	289,650		$	272,679		$	159,072		$	231,014
Add:
Preferred dividends		8,057			—			—			—			—
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		14,151			5,075			1,243			1,290			532
Noncontrolling interest—common units of the Operating Partnership		70,085			30,125			35,007			22,809			35,002
Noncontrolling interest in gains on sales of real estate—common units of the Operating Partnership		—			—			—			349			1,579
Noncontrolling interest—redeemable preferred units of the Operating Partnership		6,046			3,497			3,339			3,343			3,594
Noncontrolling interests in property partnerships		1,347			3,792			1,558			3,464			2,778
Impairment loss from discontinued operations		3,241			—			—			—			—
Less:
Gain on forgiveness of debt from discontinued operations		20,182			—			—			—			—
Gains on sales of real estate from discontinued operations		112,829			36,877			—			—			—
Income from discontinued operations		8,022			9,806			10,876			10,121			3,958
Gains on sales of real estate		—			—			—			2,734			11,760
Income from continuing operations		703,648			285,456			302,950			177,472			258,781
Add:
Real estate depreciation and amortization (1)		610,352			542,753			541,791			450,546			446,718
Impairment losses on investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures (2)		—			—			—			—			13,555
Income from discontinued operations		8,022			9,806			10,876			10,121			3,958
Less:
Gains on sales of real estate included within income from unconsolidated joint ventures (3)		54,501			248			46,166			572			—
Gains on consolidation of joint ventures (4)		385,991			—			—			—			—
Noncontrolling interests in property partnerships’ share of Funds from Operations		33,930			5,684			3,412			6,862			5,513
Noncontrolling interest—redeemable preferred units of the Operating Partnership (5)		4,079			3,497			3,339			3,343			3,594
Preferred dividends		8,057			—			—			—			—
Funds from Operations attributable to the Operating Partnership		835,464			828,586			802,700			627,362			713,905
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of Funds from Operations		84,000			87,167			91,709			80,006			95,899
Funds from Operations attributable to Boston Properties, Inc.	$	751,464		$	741,419		$	710,991		$	547,356		$	618,006
Our percentage share of Funds from Operations—basic		89.99	%		89.48	%		88.57	%		87.25	%		86.57	%
Weighted average shares outstanding—basic		152,201			152,120			145,693			139,440			131,050

(1) Real estate depreciation and amortization consists of depreciation and amortization from the Consolidated Statements of Operations of $560,637, $445,875, $429,742, $329,749 and $313,444, our share of unconsolidated joint venture real estate depreciation and amortization of $46,214, $90,076, $103,970, $113,945 and $126,943, and depreciation and amortization from discontinued operations of $4,760, $8,169, $9,442, $8,622 and $8,237, less corporate related depreciation and amortization of $1,259, $1,367, $1,363, $1,770 and $1,906, respectively, for the years ended December 31, 2013, 2012, 2011, 2010 and 2009, respectively.

(2) Consists of non-cash impairment losses on our investment in the Value-Added Fund totaling approximately $13.6 million for the year ended December 31, 2009. The non-cash impairment losses on investments in unconsolidated joint ventures included above were driven by measurable decreases in the fair value of depreciable real estate owned by the unconsolidated joint ventures and have been reflected within income from unconsolidated joint ventures in our consolidated statements of operations.

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(3) Consists of the portion of income from unconsolidated joint ventures related to (1) the gain on sale of Eighth Avenue and 46th Street totaling approximately $11.3 million and (2) the gain on sale of 125 West 55th Street totaling approximately $43.2 million for the year ended December 31, 2013. Consists of approximately $0.2 million related to the gain on sale of real estate associated with the sale of 300 Billerica Road for the year ended December 31, 2012. Consists of approximately $46.2 million related to the gain on sale of real estate associated with the sale of Two Grand Central Tower for the year ended December 31, 2011. Consists of approximately $0.6 million related to our share of the gain on sale associated with the sale of our 5.0% equity interest in the unconsolidated joint venture entity that owns the retail portion of the Wisconsin Place mixed-use property for the year ended December 31, 2010.

(4) The gains on consolidation of joint ventures consisted of (1) 767 Fifth Avenue (The General Motors Building) totaling approximately $359.5 million and (2) our Value-Added Fund’s Mountain View properties totaling approximately $26.5 million during the year ended December 31, 2013.

(5) Excludes approximately $2.0 million for the year ended December 31, 2013 of income allocated to the holders of Series Two Preferred Units to account for their right to participate on an as-converted basis in the special dividend that was primarily the result of the sale of a 45% interest in our Times Square Tower property.

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Reconciliation to Diluted Funds from Operations:

	For the years ended December 31,
	2013				2012				2011				2010				2009
	Income (Numerator)		Shares/Units (Denominator)		Income (Numerator)		Shares/Units (Denominator)		Income (Numerator)		Shares/Units (Denominator)		Income (Numerator)		Shares/Units (Denominator)		Income (Numerator)		Shares/Units (Denominator)
Basic Funds from Operations	$	835,464		169,126	$	828,586		167,769	$	802,700		164,486	$	627,362		159,821	$	713,905		151,386
Effect of Dilutive Securities:
Convertible Preferred Units (1)		3,150		1,221		3,079		1,345		3,339		1,461		3,343		1,461		3,594		1,461
Stock based compensation and exchangeable senior notes		—		320		—		591		—		525		—		618		—		462
Diluted Funds from Operations	$	838,614		170,667	$	831,665		169,705	$	806,039		166,472	$	630,705		161,900	$	717,499		153,309
Less: Noncontrolling interest—common units of the Operating Partnership’s share of diluted Funds from Operations		83,167		16,925		86,493		17,649		90,992		18,793		79,400		20,382		95,174		20,336
Diluted Funds from Operations attributable to Boston Properties, Inc. (2)	$	755,447		153,742	$	745,172		152,056	$	715,047		147,679	$	551,305		141,518	$	622,325		132,973

(1) Excludes approximately $2.0 million for the year ended December 31, 2013 of income allocated to the holders of Series Two Preferred Units to account for their right to participate on an as-converted basis in the special dividend that was primarily the result of the sale of a 45% interest in our Times Square Tower property.

(2) Our share of diluted Funds from Operations was 90.08%, 89.60%, 88.71%, 87.41% and 86.74% for the years ended December 31, 2013, 2012, 2011, 2010 and 2009, respectively.

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Net Operating Income

Net operating income, or “NOI,” is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc., the most directly comparable GAAP financial measure, plus net income attributable to noncontrolling interests, impairment loss from discontinued operations, losses (gains) from early extinguishments of debt, interest expense, depreciation and amortization, suspension of development, impairment loss, transaction costs and general and administrative expense, less gain on forgiveness of debt from discontinued operations, gains on sales of real estate from discontinued operations, income from discontinued operations, gains on sales of real estate, gains (losses) from investments in securities, interest and other income, gains on consolidation of joint ventures, income from unconsolidated joint ventures and development and management services revenue. We use NOI internally as a performance measure and believe NOI provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. Therefore, we believe NOI is a useful measure for evaluating the operating performance of our real estate assets.

Our management also uses NOI to evaluate regional property level performance and to make decisions about resource allocations. Further, we believe NOI is useful to investors as a performance measure because, when compared across periods, NOI reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. NOI excludes certain components from net income attributable to Boston Properties, Inc. in order to provide results that are more closely related to our properties’ results of operations. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. In addition, depreciation and amortization, because of historical cost accounting and useful life estimates, may distort operating performance at the property level. NOI presented by us may not be comparable to NOI reported by other REITs and real estate companies that define NOI differently. We believe that in order to facilitate a clear understanding of our operating results, NOI should be examined in conjunction with net income attributable to Boston Properties, Inc. as presented in our Consolidated Financial Statements. NOI should not be considered as an alternative to net income attributable to Boston Properties, Inc. as an indication of our performance or to cash flows as a measure of liquidity or ability to make distributions.

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The following sets forth a reconciliation of NOI to net income attributable to Boston Properties, Inc. for the fiscal years 2009 through 2013.

	Years ended December 31,
	2013			2012		2011			2010			2009
Net operating income	$	1,334,441		$	1,145,918	$	1,090,590		$	969,186		$	949,595
Add:
Development and management services income		29,695			34,060		33,406			41,202			34,849
Income from unconsolidated joint ventures		75,074			49,078		85,896			36,774			12,058
Gains on consolidation of joint ventures		385,991			—		—			—			—
Interest and other income		8,310			10,091		5,358			7,332			4,050
Gains (losses) from investments in securities		2,911			1,389		(443	)		935			2,434
Gains on sales of real estate		—			—		—			2,734			11,760
Income from discontinued operations		8,022			9,806		10,876			10,121			3,958
Gains on sales of real estate from discontinued operations		112,829			36,877		—			—			—
Gain on forgiveness of debt from discontinued operations		20,182			—		—			—			—
Less:
General and administrative		115,329			90,129		87,101			87,459			83,512
Transaction costs		1,744			3,653		1,987			2,876			—
Impairment loss		8,306			—		—			—			—
Suspension of development		—			—		—			(7,200	)		27,766
Depreciation and amortization		560,637			445,875		429,742			329,749			313,444
Interest expense		446,880			410,970		391,533			375,403			318,989
Losses (gains) from early extinguishments of debt		(122	)		4,453		1,494			89,670			494
Impairment loss from discontinued operations		3,241			—		—			—			—
Noncontrolling interests in property partnerships		1,347			3,792		1,558			3,464			2,778
Noncontrolling interest—redeemable preferred units of the Operating Partnership		6,046			3,497		3,339			3,343			3,594
Noncontrolling interest in gains on sales of real estate—common units of the Operating Partnership		—			—		—			349			1,579
Noncontrolling interests—common units of the Operating Partnership		70,085			30,125		35,007			22,809			35,002
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		14,151			5,075		1,243			1,290			532
Net income attributable to Boston Properties, Inc.	$	749,811		$	289,650	$	272,679		$	159,072		$	231,014

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Contractual Obligations

As of December 31, 2013, we were subject to contractual payment obligations as described in the table below.

	Payments Due by Period
	Total		2014		2015		2016		2017		2018		Thereafter
	(Dollars in thousands)
Contractual Obligations:
Long-term debt
Mortgage debt(1)	$	5,588,733	$	345,034	$	279,078	$	856,050	$	3,253,650	$	53,271	$	801,650
Unsecured senior notes(1)		7,617,777		257,113		792,425		227,738		227,738		1,077,738		5,035,025
Exchangeable senior notes(1)(2)		761,048		761,048		—		—		—		—		—
Unsecured line of credit(1)		—		—		—		—		—		—		—
Ground leases		967,771		13,184		13,507		13,732		13,963		14,198		899,187
Tenant obligations(3)(4)		156,954		124,759		28,704		2,440		1,034		—		17
Construction contracts on development projects(4)		653,227		403,666		212,842		35,017		1,702		—		—
Other obligations		2,221		473		73		1,363		73		73		166
Total Contractual Obligations	$	15,747,731	$	1,905,277	$	1,326,629	$	1,136,340	$	3,498,160	$	1,145,280	$	6,736,045

(1) Amounts include principal and interest payments.

(2) Debt was repaid on February 18, 2014. Refer to Footnote 20 of the Consolidated Financial Statements.

(3) Committed tenant-related obligations based on executed leases as of December 31, 2013 (tenant improvements and lease commissions).

(4) Includes 100% of the obligations for our consolidated joint ventures and only our share for the unconsolidated joint ventures.

We have various standing or renewable service contracts with vendors related to our property management. In addition, we have certain other contracts we enter into in the ordinary course of business that may extend beyond one year. These contracts are not included as part of our contractual obligations because they include terms that provide for cancellation with insignificant or no cancellation penalties. Contract terms are generally between three to five years.

During 2013, we paid approximately $161.9 million to fund tenant-related obligations, including tenant improvements and leasing commissions, and incurred approximately $172 million of new tenant-related obligations associated with approximately 4.6 million square feet of second generation leases, or approximately $38 per square foot. In addition, we signed leases for approximately 545,000 square feet at our development properties. The tenant-related obligations for the development properties are included within the projects’ “Estimated Total Investment” referred to in “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.” In the aggregate, during 2013, we signed leases for approximately 5.1 million square feet of space and incurred aggregate tenant-related obligations of approximately $226 million, or approximately $44 per square foot.

Off-Balance Sheet Arrangements—Joint Venture Indebtedness

We have investments in unconsolidated joint ventures with our effective ownership interests ranging from 25% to 60%. Six of these joint ventures have mortgage indebtedness. We exercise significant influence over, but do not control, these entities and therefore they are presently accounted for using the equity method of accounting. See also Note 5 to the Consolidated Financial Statements. At December 31, 2013, the aggregate

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carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $749.7 million (of which our proportionate share is approximately $329.2 million). The table below summarizes the outstanding debt of these joint venture properties at December 31, 2013. In addition to other guarantees specifically noted in the table, we have agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) on certain of the loans.

Properties	Venture Ownership %			Stated Interest Rate			GAAP Interest Rate(1)			Stated Principal Amount				Maturity Date
	(Dollars in thousands)
540 Madison Avenue		60	%		1.67	%		1.84	%	$	120,000	(2	)(3)		June 5, 2018
Metropolitan Square		51	%		5.75	%		5.81	%		173,703				May 5, 2020
Market Square North		50	%		4.85	%		4.91	%		129,678				October 1, 2020
Annapolis Junction Building One		50	%		1.92	%		2.08	%		41,272	(4	)		March 31, 2018
Annapolis Junction Building Six		50	%		1.82	%		2.01	%		13,993	(2	)(5)		November 17, 2014
Annapolis Junction Building Seven		50	%		1.83	%		2.39	%		12,433	(2	)(6)		April 4, 2016
500 North Capitol Street		30	%		4.15	%		4.19	%		105,000	(2	)		June 6, 2023
901 New York Avenue		25	%		5.19	%		5.27	%		153,653				January 1, 2015
Total										$	749,732

(1) GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges.

(2) The loan requires interest only payments with a balloon payment due at maturity.

(3) Mortgage loan bears interest at a variable rate equal to LIBOR plus 1.50% per annum.

(4) Mortgage loan bears interest at a variable rate equal to LIBOR plus 1.75% per annum and matures on March 31, 2018 with one, three-year extension option, subject to certain conditions.

(5) The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on November 17, 2014 with a one-year extension option, subject to certain conditions.

(6) The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on April 4, 2016 with two, one-year extension option, subject to certain conditions.

Environmental Matters

It is our policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with our acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that we believe will have a material adverse effect on our business, assets, financial condition, results of operations or liquidity, and we are not otherwise aware of environmental conditions with respect to our properties that we believe would have such a material adverse effect. However, from time to time environmental conditions at our properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, we (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. We developed an office park on the property. We engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to our ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify us for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges.

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Environmental investigations at some of our properties and certain properties owned by our affiliates have identified groundwater contamination migrating from off-site source properties. In each case we engaged a licensed environmental consultant to perform the necessary investigations and assessments, and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. We also believe that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although we believe that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, we will take such further response actions (if any) that we deem necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time.

Some of our properties and certain properties owned by our affiliates are located in urban, industrial and other previously developed areas where fill or current or historical use of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations it is our practice to investigate the nature and extent of detected contamination and estimate the costs of required response actions and special handling procedures. We then use this information as part of our decision-making process with respect to the acquisition and/or development of the property. For example, we own a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. We have developed an office park on this property. Prior to and during redevelopment activities, we engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws.

We expect that resolution of the environmental matters described above will not have a material impact on our business, assets, financial condition, results of operations or liquidity. However, we cannot assure you that we have identified all environmental liabilities at our properties, that all necessary remediation actions have been or will be undertaken at our properties, that we will be indemnified, in full or at all, or that we will have insurance coverage in the event that such environmental liabilities arise.

Reclassifications and Adoption of New Accounting Pronouncements

We have modified the presentation of expenses to operate its San Francisco and Princeton regional offices to reflect the growing activity in its San Francisco region and to have a consistent presentation across our company. These expenses, which totaled approximately $8.1 million, $7.7 million and $7.5 million for the years ended December 31, 2013, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income” (“ASU No. 2013-02”). ASU No. 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income, but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period.

109

For other amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU No. 2013-02 is effective prospectively for reporting periods beginning after December 15, 2012. Our adoption of ASU No. 2013-02 did not have a material impact on our consolidated financial statements.

Inflation

Substantially all of our leases provide for separate real estate tax and operating expense escalations over a base amount. In addition, many of our leases provide for fixed base rent increases or indexed increases. We believe that inflationary increases in costs may be at least partially offset by the contractual rent increases and operating expense escalations.

Item 7A—Quantitative and Qualitative Disclosures about Market Risk.

As of December 31, 2013, approximately $11.3 billion of our consolidated borrowings bore interest at fixed rates and none of our consolidated borrowings bore interest at variable rates. The fair value of these instruments is affected by changes in market interest rates. The table below does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, refer to Note 5 to the Consolidated Financial Statements and “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness.”

	2014			2015			2016			2017			2018			2019+			Total			Estimated Fair  Value
	(Dollars in thousands) Mortgage debt
Fixed Rate	$	140,251		$	80,070		$	659,511		$	2,855,942		$	18,633		$	695,327		$	4,449,734		$	4,545,283
Average Interest Rate		5.66	%		5.87	%		5.29	%		3.90	%		5.52	%		4.94	%		4.31	%
Variable Rate		—			—			—			—			—			—			—			—
	Mezzanine debt
Fixed Rate	$	1,244		$	1,314		$	1,389		$	307,093		$	—		$	—		$	311,040		$	311,064
Average Interest Rate		—			—			—			5.53	%		—			—			5.53	%
Variable Rate		—			—			—			—			—			—			—			—
	Unsecured debt
Fixed Rate	$	—		$	549,703		$	—		$	—		$	848,572		$	4,437,579		$	5,835,854		$	6,050,517
Average Interest Rate		—			5.47	%		—			—			3.85	%		4.53	%		4.52	%
Variable Rate		—			—			—			—			—			—			—			—
	Unsecured exchangeable debt
Fixed Rate	$	747,318		$	—		$	—		$	—		$	—		$	—		$	747,318		$	750,266
Adjustment for the equity component allocation		(2,438	)		—			—			—			—			—			(2,438	)		—
Total Fixed Rate		744,880			—			—			—			—			—			744,880			—
Average Interest Rate		6.56	%		—			—			—			—			—			6.56	%		—
Variable Rate		—			—			—			—			—			—			—			—
Total Debt	$	886,375		$	631,087		$	660,900		$	3,163,035		$	867,205		$	5,132,906		$	11,341,508		$	11,657,130

110

At December 31, 2013, the weighted-average coupon/stated rates on all of our outstanding debt, all of which had a fixed interest rate, was 4.93% per annum. At December 31, 2013 we had no outstanding variable rate debt. The weighted-average coupon/stated rates for our unsecured debt and unsecured exchangeable debt were 4.44% per annum and 3.63% per annum, respectively.

The fair value amounts were determined solely by considering the impact of hypothetical interest rates on our financial instruments. Due to the uncertainty of specific actions we may undertake to minimize possible effects of market interest rate increases, this analysis assumes no changes in our financial structure.

Additional disclosure about market risk is incorporated herein by reference from “Item 7—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Market Risk.”

111

Item 8. Financial Statements and Supplementary Data

BOSTON PROPERTIES, INC.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	Page
Management’s Report on Internal Control over Financial Reporting	113
Report of Independent Registered Public Accounting Firm	114
Consolidated Balance Sheets as of December 31, 2013 and 2012	115
Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011	116
Consolidated Statements of Comprehensive Income for the years ended December 31, 2013, 2012 and 2011	117
Consolidated Statements of Stockholders’ Equity for the years ended December  31, 2013, 2012 and 2011	118
Consolidated Statements of Cash Flows for the years ended December 31, 2013, 2012 and 2011	119
Notes to Consolidated Financial Statements	121
Financial Statement Schedule—Schedule III	169

All other schedules for which a provision is made in the applicable accounting regulations of the SEC are not required under the related instructions or are inapplicable, and therefore have been omitted.

112

Management’s Report on Internal Control over

Financial Reporting

Management of Boston Properties, Inc. (“the Company”) is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. The Company’s internal control over financial reporting is a process designed under the supervision of the Company’s principal executive officer and principal financial officer to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Company’s financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles.

As of the end of the Company’s 2013 fiscal year, management conducted assessments of the effectiveness of the Company’s internal control over financial reporting based on the framework established in Internal Control—Integrated Framework (1992) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on these assessments, management has determined that the Company’s internal control over financial reporting as of December 31, 2013 was effective.

Our internal control over financial reporting includes policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of management and the directors of the Company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the Company’s assets that could have a material effect on our financial statements.

The effectiveness of the Company’s internal control over financial reporting as of December 31, 2013 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report appearing on page 114, which expresses an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting as of December 31, 2013.

113

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders

of Boston Properties, Inc.:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of Boston Properties, Inc. and its subsidiaries at December 31, 2013 and December 31, 2012, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2013 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control—Integrated Framework (1992) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/    PricewaterhouseCoopers LLP

Boston, MA

February 28, 2014

114

BOSTON PROPERTIES, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except for share and par value amounts)

	December 31, 2013			December 31, 2012
ASSETS
Real estate, at cost	$	18,978,765		$	14,893,328
Less: accumulated depreciation		(3,161,571	)		(2,934,160	)
Total real estate		15,817,194			11,959,168
Cash and cash equivalents		2,365,137			1,041,978
Cash held in escrows		57,201			55,181
Investments in securities		16,641			12,172
Tenant and other receivables (net of allowance for doubtful accounts of $1,636 and $1,960, respectively)		59,464			69,555
Related party notes receivable		—			282,491
Interest receivable from related party notes receivable		—			104,816
Accrued rental income (net of allowance of $3,636 and $1,571, respectively)		651,603			598,199
Deferred charges, net		884,450			588,235
Prepaid expenses and other assets		184,477			90,610
Investments in unconsolidated joint ventures		126,084			659,916
Total assets	$	20,162,251		$	15,462,321
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable	$	4,449,734		$	3,102,485
Unsecured senior notes (net of discount of $14,146 and $10,472, respectively)		5,835,854			4,639,528
Unsecured exchangeable senior notes (net of discount of $182 and $1,653, respectively)		744,880			1,170,356
Unsecured line of credit		—			—
Mezzanine notes payable		311,040			—
Outside members’ notes payable		180,000			—
Accounts payable and accrued expenses		202,470			199,102
Dividends and distributions payable		497,242			110,488
Accrued interest payable		167,523			72,461
Other liabilities		578,969			324,613
Total liabilities		12,967,712			9,619,033
Commitments and contingencies		—			—
Noncontrolling interests:
Redeemable preferred units of the Operating Partnership		51,312			110,876
Redeemable interest in property partnership		99,609			97,558
Equity:
Stockholders’ equity attributable to Boston Properties, Inc.:
Excess stock, $.01 par value, 150,000,000 shares authorized, none issued or outstanding		—			—
Preferred stock, $.01 par value, 50,000,000 shares authorized; 5.25% Series B cumulative redeemable preferred stock, $.01 par value, liquidation preference $2,500 per share, 92,000 shares authorized, 80,000 and no shares issued and outstanding at December 31, 2013 and December 31, 2012, respectively		200,000			—
Common stock, $.01 par value, 250,000,000 shares authorized, 153,062,001 and 151,680,109 issued and 152,983,101 and 151,601,209 outstanding at December 31, 2013 and December 31, 2012, respectively		1,530			1,516
Additional paid-in capital		5,662,453			5,222,073
Dividends in excess of earnings		(108,552	)		(109,985	)
Treasury common stock at cost, 78,900 shares at December 31, 2013 and December 31, 2012		(2,722	)		(2,722	)
Accumulated other comprehensive loss		(11,556	)		(13,817	)
Total stockholders’ equity attributable to Boston Properties, Inc.		5,741,153			5,097,065
Noncontrolling interests:
Common units of the Operating Partnership		576,333			539,753
Property partnerships		726,132			(1,964	)
Total equity		7,043,618			5,634,854
Total liabilities and equity	$	20,162,251		$	15,462,321

The accompanying notes are an integral part of these consolidated financial statements.

115

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

	For the year ended December 31,
	2013			2012			2011
	(in thousands, except for per share amounts)
Revenue
Rental
Base rent	$	1,675,412		$	1,457,834		$	1,376,278
Recoveries from tenants		292,944			228,170			198,083
Parking and other		97,158			89,207			80,496
Total rental revenue		2,065,514			1,775,211			1,654,857
Hotel revenue		40,330			37,915			34,529
Development and management services		29,695			34,060			33,406
Total revenue		2,135,539			1,847,186			1,722,792
Expenses
Operating
Rental		742,956			639,088			572,668
Hotel		28,447			28,120			26,128
General and administrative		115,329			90,129			87,101
Transaction costs		1,744			3,653			1,987
Impairment loss		8,306			—			—
Depreciation and amortization		560,637			445,875			429,742
Total expenses		1,457,419			1,206,865			1,117,626
Operating income		678,120			640,321			605,166
Other income (expense)
Income from unconsolidated joint ventures		75,074			49,078			85,896
Gains on consolidation of joint ventures		385,991			—			—
Interest and other income		8,310			10,091			5,358
Gains (losses) from investments in securities		2,911			1,389			(443	)
Interest expense		(446,880	)		(410,970	)		(391,533	)
Gains (losses) from early extinguishments of debt		122			(4,453	)		(1,494	)
Income from continuing operations		703,648			285,456			302,950
Discontinued operations
Income from discontinued operations		8,022			9,806			10,876
Gains on sales of real estate from discontinued operations		112,829			36,877			—
Gain on forgiveness of debt from discontinued operations		20,182			—			—
Impairment loss from discontinued operations		(3,241	)		—			—
Net income		841,440			332,139			313,826
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(1,347	)		(3,792	)		(1,558	)
Noncontrolling interest—redeemable preferred units of the Operating Partnership		(6,046	)		(3,497	)		(3,339	)
Noncontrolling interest—common units of the Operating Partnership		(70,085	)		(30,125	)		(35,007	)
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		(14,151	)		(5,075	)		(1,243	)
Net income attributable to Boston Properties, Inc.		749,811			289,650			272,679
Preferred dividends		(8,057	)		—			—
Net income attributable to Boston Properties, Inc. common shareholders	$	741,754		$	289,650		$	272,679
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$	4.06		$	1.65		$	1.80
Discontinued operations		0.81			0.28			0.07
Net income	$	4.87		$	1.93		$	1.87
Weighted average number of common shares outstanding		152,201			150,120			145,693
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$	4.05		$	1.64		$	1.80
Discontinued operations		0.81			0.28			0.06
Net income	$	4.86		$	1.92		$	1.86
Weighted average number of common and common equivalent shares outstanding		152,521			150,711			146,218

The accompanying notes are an integral part of these consolidated financial statements.

116

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Net income	$	841,440		$	332,139		$	313,826
Other comprehensive income:
Amortization of interest rate contracts (1)		2,513			2,594			2,595
Other comprehensive income		2,513			2,594			2,595
Comprehensive income		843,953			334,733			316,421
Net income attributable to noncontrolling interests		(91,629	)		(42,489	)		(41,147	)
Other comprehensive income attributable to noncontrolling interests		(252	)		(273	)		(297	)
Comprehensive income attributable to Boston Properties, Inc.	$	752,072		$	291,971		$	274,977

(1) Amounts reclassified from comprehensive income primarily to interest expense within the Company’s Consolidated Statements of Operations.

The accompanying notes are an integral part of these consolidated financial statements.

117

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

	Common Stock				Preferred Stock		Additional Paid-in Capital			Dividends in Excess of Earnings			Treasury Stock, at cost			Accumulated Other Comprehensive Loss			Noncontrolling Interests			Total
	Shares		Amount
Equity, December 31, 2010		140,199	$	1,402	$	—	$	4,417,162		$	(24,763	)	$	(2,722	)	$	(18,436	)	$	591,550		$	4,964,193
Redemption of operating partnership units to Common Stock		2,919		29		—		85,469			—			—			—			(85,498	)		—
Reallocation of noncontrolling interest		—		—		—		(23,073	)		—			—			—			23,073			—
Allocated net income for the year		—		—		—		—			272,679			—			—			37,808			310,487
Dividends/distributions declared		—		—		—		—			(300,996	)		—			—			(39,132	)		(340,128	)
Sale of common stock, net of offering costs		4,660		47		—		438,990			—			—			—			—			439,037
Shares issued pursuant to stock purchase plan		6		—		—		620			—			—			—			—			620
Net activity from stock option and incentive plan		324		3		—		17,289			—			—			—			21,427			38,719
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(2,007	)		(2,007	)
Amortization of interest rate contracts		—		—		—		—			—			—			2,298			297			2,595
Equity, December 31, 2011		148,108		1,481		—		4,936,457			(53,080	)		(2,722	)		(16,138	)		547,518			5,413,516
Redemption of operating partnership units to common stock		1,111		11		—		34,610			—			—			—			(34,621	)		—
Conversion of redeemable preferred units to common units		—		—		—		—			—			—			—			5,852			5,852
Allocated net income for the year		—		—		—		—			289,650			—			—			37,189			326,839
Dividends/distributions declared		—		—		—		—			(346,555	)		—			—			(41,434	)		(387,989	)
Sale of common stock, net of offering costs		2,348		24		—		247,003			—			—			—			—			247,027
Shares issued pursuant to stock purchase plan		7		—		—		781			—			—			—			—			781
Net activity from stock option and incentive plan		27		—		—		5,419			—			—			—			23,705			29,124
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(2,890	)		(2,890	)
Amortization of interest rate contracts		—		—		—		—			—			—			2,321			273			2,594
Reallocation of noncontrolling interest		—		—		—		(2,197	)		—			—			—			2,197			—
Equity, December 31, 2012		151,601		1,516		—		5,222,073			(109,985	)		(2,722	)		(13,817	)		537,789			5,634,854
Redemption of operating partnership units to common stock		929		10		—		30,281			—			—			—			(30,291	)		—
Conversion of redeemable preferred units to common units		—		—		—		—			—			—			—			16,494			16,494
Allocated net income for the year		—		—		—		—			749,811			—			—			78,946			828,757
Dividends/distributions declared		—		—		—		—			(748,378	)		—			—			(83,448	)		(831,826	)
Issuance of 5.25% Series B cumulative redeemable preferred stock		—		—		200,000		(6,377	)		—			—			—			—			193,623
Shares issued in connection with exchange of Exchangeable Senior Notes		419		4		—		43,830			—			—			—			—			43,834
Equity component of exchange of Exchangeable Senior Notes		—		—		—		(43,869	)		—			—			—			—			(43,869	)
Shares issued pursuant to stock purchase plan		6		—		—		681			—			—			—			—			681
Net activity from stock option and incentive plan		28		—		—		7,701			—			—			—			27,870			35,571
Noncontrolling interests in property partnerships recorded upon consolidation		—		—		—		—			—			—			—			480,861			480,861
Sale of interest in property partnership and contributions from noncontrolling interests in property partnerships		—		—		—		429,600			—			—			—			257,564			687,164
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(5,039	)		(5,039	)
Amortization of interest rate contracts		—		—		—		—			—			—			2,261			252			2,513
Reallocation of noncontrolling interest		—		—		—		(21,467	)		—			—			—			21,467			—
Equity, December 31, 2013		152,983	$	1,530	$	200,000	$	5,662,453		$	(108,552	)	$	(2,722	)	$	(11,556	)	$	1,302,465		$	7,043,618

The accompanying notes are an integral part of these consolidated financial statements.

118

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Cash flows from operating activities:
Net income	$	841,440		$	332,139		$	313,826
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		565,397			454,044			439,184
Non-cash compensation expense		45,155			29,679			29,672
Impairment loss		8,306			—			—
Income from unconsolidated joint ventures		(75,074	)		(49,078	)		(85,896	)
Gains on consolidation of joint ventures		(385,991	)		—			—
Distributions of net cash flow from operations of unconsolidated joint ventures		32,600			47,002			39,851
Losses (gains) from investments in securities		(2,911	)		(1,389	)		443
Non-cash portion of interest expense		2,649			43,131			54,962
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes		(56,532	)		(69,499	)		(5,601	)
Losses (gains) from early extinguishments of debt		(264	)		(1,000	)		1,494
Gains on sales of real estate from discontinued operations		(112,829	)		(36,877	)		—
Gain on forgiveness of debt from discontinued operations		(20,182	)		—			—
Impairment loss from discontinued operations		3,241			—			—
Change in assets and liabilities:
Cash held in escrows		315			10,272			(9,801	)
Tenant and other receivables, net		(443	)		23,155			(19,396	)
Accrued rental income, net		(59,972	)		(77,363	)		(79,992	)
Prepaid expenses and other assets		12,966			6,990			(39,213	)
Accounts payable and accrued expenses		13,108			3,854			6,660
Accrued interest payable		21,302			3,356			6,778
Other liabilities		2,073			1,354			6,569
Tenant leasing costs		(56,428	)		(76,821	)		(53,212	)
Total adjustments		(63,514	)		310,810			292,502
Net cash provided by operating activities		777,926			642,949			606,328
Cash flows from investing activities:
Acquisitions of real estate		(522,900	)		(788,052	)		(112,180	)
Construction in progress		(396,835	)		(356,397	)		(271,856	)
Building and other capital improvements		(73,821	)		(49,943	)		(61,961	)
Tenant improvements		(105,425	)		(139,662	)		(76,320	)
Proceeds from sales of real estate		250,078			61,963			—
Cash recorded upon consolidation		79,468			—			—
Proceeds from land transaction		—			—			43,887
Proceeds from mortgage loan released from (placed in) escrow		—			—			267,500
Deposits on real estate		—			—			10,000
Issuance of notes receivable, net		12,491			(2,049	)		(10,442	)
Capital contributions to unconsolidated joint ventures		—			(6,214	)		(17,970	)
Capital distributions from unconsolidated joint ventures		225,862			3,557			140,505
Investments in securities, net		(1,558	)		(1,235	)		(1,259	)
Net cash used in investing activities		(532,640	)		(1,278,032	)		(90,096	)

The accompanying notes are an integral part of these consolidated financial statements.

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	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Cash flows from financing activities:
Proceeds from mortgage notes payable		—			—			1,178,306
Repayments of mortgage notes payable		(80,311	)		(253,877	)		(1,251,841	)
Proceeds from unsecured senior notes		1,194,753			997,790			848,019
Redemption/repurchase of unsecured senior notes		—			(224,261	)		—
Redemption/repurchase/exchange of unsecured exchangeable senior notes		(393,468	)		(507,434	)		(44,586	)
Deferred financing costs		(15,195	)		(8,468	)		(15,970	)
Net proceeds from preferred stock issuance		193,623			—			—
Deposit on mortgage loan financing		—			—			(14,500	)
Returned deposit on mortgage loan financing		—			—			14,500
Net proceeds from ATM stock issuances		—			247,027			439,037
Net proceeds from equity transactions		(334	)		226			9,667
Redemption of preferred units		(43,070	)		(18,329	)		—
Dividends and distributions		(451,118	)		(372,899	)		(332,597	)
Sale of interest in property partnership and contributions from noncontrolling interests in property partnerships		682,617			—			—
Distributions to noncontrolling interests in property partnerships		(9,624	)		(5,922	)		(2,007	)
Net cash provided by (used in) financing activities		1,077,873			(146,147	)		828,028
Net increase (decrease) in cash and cash equivalents		1,323,159			(781,230	)		1,344,260
Cash and cash equivalents, beginning of year		1,041,978			1,823,208			478,948
Cash and cash equivalents, end of year	$	2,365,137		$	1,041,978		$	1,823,208
Supplemental disclosures:
Cash paid for interest	$	547,973		$	480,866		$	386,170
Interest capitalized	$	68,152		$	44,278		$	48,178
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	$	19,824		$	14,059		$	10,767
Real estate and related intangibles recorded upon consolidation	$	3,356,000		$	—		$	—
Debt recorded upon consolidation	$	2,056,000		$	—		$	—
Working capital recorded upon consolidation	$	177,315		$	—		$	—
Noncontrolling interests recorded upon consolidation	$	480,861		$	—		$	—
Investment in unconsolidated joint ventures eliminated upon consolidation	$	361,808		$	—		$	—
Mortgage note extinguished through foreclosure	$	25,000		$	—		$	—
Real estate transferred upon foreclosure	$	7,508		$	—		$	—
Land improvements contributed by noncontrolling interest in property partnership	$	4,546		$	—		$	—
Mortgage note payable assumed in connection with the acquisition of real estate	$	—		$	211,250		$	143,900
Redeemable noncontrolling interest in property partnership	$	—		$	98,787		$	—
Preferred units issued in connection with the acquisition of real estate	$	—		$	79,405		$	—
Dividends and distributions declared but not paid	$	497,242		$	110,488		$	91,901
Issuance of common stock in connection with the exchange of exchangeable senior notes	$	43,834		$	—		$	—
Conversions of noncontrolling interests to stockholders’ equity	$	30,291		$	34,621		$	85,498
Conversion of redeemable preferred units to common units	$	16,494		$	5,852		$	—
Issuance of restricted securities to employees and directors	$	30,077		$	26,198		$	25,087

The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

BOSTON PROPERTIES, INC.

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

1. Organization

Boston Properties, Inc. (the “Company”), a Delaware corporation, is a self-administered and self-managed real estate investment trust (“REIT”). The Company is the sole general partner of Boston Properties Limited Partnership (the “Operating Partnership”) and at December 31, 2013 owned an approximate 89.5% (89.0% at December 31, 2012) general and limited partnership interest in the Operating Partnership. Partnership interests in the Operating Partnership are denominated as “common units of partnership interest” (also referred to as “OP Units”), “long term incentive units of partnership interest” (also referred to as “LTIP Units”) or “preferred units of partnership interest” (also referred to as “Preferred Units”). In addition, in February 2011 and February 2012, the Company issued LTIP Units in connection with the granting to employees of outperformance awards (also referred to as “2011 OPP Units” and “2012 OPP Units,” respectively, and collectively as “OPP Units”). In February 2013, the Company issued LTIP Units in connection with the granting to employees of 2013 MYLTIP Units (“2013 MYLTIP Units”). Because the rights, preferences and privileges of OPP Units and 2013 MYLTIP Units differ from other LTIP Units granted to employees as part of the annual compensation process, unless specifically noted otherwise, all references to LTIP Units exclude OPP Units and 2013 MYLTIP Units (See Notes 11 and 17).

Unless specifically noted otherwise, all references to OP Units exclude units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership is obligated to redeem such OP Unit for cash equal to the value of a share of common stock of the Company (“Common Stock”) at such time. In lieu of a cash redemption, the Company may elect to acquire such OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that the Company owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock. An LTIP Unit is generally the economic equivalent of a share of restricted common stock of the Company. LTIP Units, whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Note 12).

At December 31, 2013, there were three series of Preferred Units outstanding (i.e., Series Two Preferred Units, Series Four Preferred Units and Series B Preferred Units).

• The Series Two Preferred Units bear a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Each Series Two Preferred Unit may also be converted into approximately 1.312336 OP Units or redeemed for $50.00 of cash at the election of the holder thereof or the Operating Partnership in accordance with the terms and conditions set forth in the applicable amendment to the partnership agreement (See Note 11).

• The Series Four Preferred Units are not convertible into or exchangeable for any common equity of the Operating Partnership or the Company, have a per unit liquidation preference of $50.00 and are entitled to receive quarterly distributions of $0.25 per unit (or an annual rate of 2.00%) (See Note 11).

• The Series B Preferred Units were issued to the Company on March 27, 2013 in connection with the Company’s issuance of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of 5.25% Series B Cumulative Redeemable Preferred Stock (the “Series B Preferred Stock”). The Company contributed the net proceeds from the offering to the Operating Partnership in exchange for 80,000 Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock (See Note 12).

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All references herein to the Company refer to Boston Properties, Inc. and its consolidated subsidiaries, including the Operating Partnership, collectively, unless the context otherwise requires.

Properties

At December 31, 2013, the Company owned or had interests in a portfolio of 175 commercial real estate properties (the “Properties”) aggregating approximately 44.4 million net rentable square feet, including nine properties under construction totaling approximately 2.9 million net rentable square feet. In addition, the Company has structured parking for approximately 45,234 vehicles containing approximately 15.4 million square feet. At December 31, 2013, the Properties consist of:

• 167 office properties, including 128 Class A office properties (including eight properties under construction) and 39 Office/Technical properties;

• one hotel;

• four retail properties; and

• three residential properties (including one property under construction).

The Company owns or controls undeveloped land parcels totaling approximately 503.6 acres.

The Company considers Class A office properties to be centrally located buildings that are professionally managed and maintained, attract high-quality tenants and command upper-tier rental rates, and that are modern structures or have been modernized to compete with newer buildings. The Company considers Office/Technical properties to be properties that support office, research and development, laboratory and other technical uses. The Company’s definitions of Class A Office and Office/Technical properties may be different than those used by other companies. Net rentable square feet amounts are unaudited.

Basis of Presentation

Boston Properties, Inc. does not have any other significant assets, liabilities or operations, other than its investment in the Operating Partnership, nor does it have employees of its own. The Operating Partnership, not Boston Properties, Inc., executes all significant business relationships. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities (“VIE“s) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.

2. Summary of Significant Accounting Policies

Real Estate

Upon acquisitions of real estate that constitutes a business, which includes the consolidation of previously unconsolidated joint ventures, the Company assesses the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities, and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. The Company assesses and considers fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that it deems appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions. The fair value of the tangible assets of an acquired

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property considers the value of the property as if it were vacant. The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenant’s credit quality and expectations of lease renewals. Based on its acquisitions to date, the Company’s allocation to customer relationship intangible assets has been immaterial.

The Company records acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below- market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in the Company’s Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on the Company’s evaluation of the specific characteristics of each tenant’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses.

Management reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of its assets is not recoverable and exceeds its fair value. If such criteria are present, an impairment loss is recognized based on the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, the Company’s established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If the Company’s strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If the Company determines that impairment has occurred, the affected assets must be reduced to their fair value, less cost to sell.

Accounting Standards Codification (“ASC”) ASC 360 “Property Plant and Equipment” requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be “held for sale” when the transaction has been approved by the Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that the property sale within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. The Company expenses costs that it incurs to effect a business combination such as legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is

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allocated to the specific component of a project that is benefited. Determinations of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involve a degree of judgment. The Company’s capitalization policy on development properties is guided by guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate—General.” The costs of land and buildings under development include specifically identifiable costs. The capitalized costs include pre-construction costs necessary to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The Company begins the capitalization of costs during the pre-construction period, which it defines as activities that are necessary to the development of the property. The Company considers a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed and (2) occupied or held available for occupancy, and capitalizes only those costs associated with the portion under construction, or if activities necessary for the development of the property have been suspended. Interest costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $68.2 million, $44.3 million and $48.2 million, respectively. Salaries and related costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $7.7 million, $7.1 million and $6.5 million, respectively.

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired, their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period.

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. In accordance with ASC 805, the Company allocates the acquisition cost of real estate to its components and depreciates or amortizes these assets (or liabilities) over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations.

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company’s cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000. The Company has not experienced any losses to date on its invested cash.

Cash Held in Escrows

Escrows include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs.

Investments in Securities

The Company accounts for investments in trading securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The designation of trading securities is generally

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determined at acquisition. The Company maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2013 and 2012, the Company had maintained approximately $16.6 million and $12.2 million, respectively, in a separate account, which is not restricted as to its use. The Company recognized gains (losses) of approximately $2.9 million, $1.4 million and $(0.4) million on its investments in the account associated with the Company’s deferred compensation plan during the years ended December 31, 2013, 2012 and 2011, respectively.

Tenant and Other Receivables

Tenant and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Deferred Charges

Deferred charges include leasing costs and financing fees. Leasing costs include an allocation for acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage, legal, internal leasing employee salaries and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Internal leasing salaries and related costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $5.1 million, $5.6 million and $4.4 million, respectively. External fees and costs incurred to obtain long-term financing have been deferred and are being amortized over the terms of the respective loans and are included within interest expense. Unamortized financing and leasing costs are charged to expense upon the early repayment or significant modification of the financing or upon the early termination of the lease, respectively. Fully amortized deferred charges are removed from the books upon the expiration of the lease or maturity of the debt.

Investments in Unconsolidated Joint Ventures

The Company consolidates variable interest entities (VIEs) in which it is considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have a controlling financial interest. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance, and (2) the obligation to absorb losses and right to receive the returns from the variable interest entity that would be significant to the variable interest entity. For ventures that are not VIEs the Company consolidates entities for which it has significant decision making control over the ventures’ operations. The Company’s judgment with respect to its level of influence or control of an entity involves the consideration of various factors including the form of the Company’s ownership interest, its representation in the entity’s governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the venture, if applicable. The Company’s assessment of its influence or control over an entity affects the presentation of these investments in the Company’s consolidated financial statements. In addition to evaluating control rights, the Company consolidates entities in which the outside partner has no substantive kick-out rights to remove the Company as the managing member.

Accounts of the consolidated entity are included in the accounts of the Company and the non-controlling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an

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adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company’s share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, the Company’s recognition of joint venture income or loss generally follows the joint venture’s distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture. The Company’s investments in unconsolidated joint ventures are reviewed for impairment periodically and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying values has occurred and such decline is other-than-temporary, which is dependent on a number of factors, including the performance of each investment and market conditions.

To the extent that the Company contributes assets to a joint venture, the Company’s investment in the joint venture is recorded at the Company’s cost basis in the assets that were contributed to the joint venture. To the extent that the Company’s cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company’s share of equity in net income of the joint venture. In accordance with the provisions of ASC 970-323 “Investments—Equity Method and Joint Ventures” (“ASC 970-323”), the Company will recognize gains on the contribution of real estate to joint ventures, relating solely to the outside partner’s interest, to the extent the economic substance of the transaction is a sale.

Equity Offering Costs

Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital.

Treasury Stock

The Company’s share repurchases are reflected as treasury stock utilizing the cost method of accounting and are presented as a reduction to consolidated stockholders’ equity.

Dividends

Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains/losses on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation.

The tax treatment of common dividends per share for federal income tax purposes is as follows:

	For the year ended December 31,
	2013						2012					2011
	Per Share			%			Per Share		%			Per Share		%
Ordinary income	$	2.31			48.71	%	$	2.29		96.45	%	$	2.06		97.39	%
Capital gain income		2.44			51.29	%		0.08		3.55	%		0.05		2.61	%
Total	$	4.75	(1)		100.00	%	$	2.37		100.00	%	$	2.11		100.00	%

(1) The fourth quarter 2013 dividend of $2.90 per common share consists of a $2.25 per common share special dividend and a $0.65 per common share regular quarterly dividend of which approximately $2.44 per common share was allocable to 2013 and approximately $0.46 per common share is allocable to 2014.

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Revenue Recognition

Contractual rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $65.8 million, $77.6 million and $77.0 million for the years ended December 31, 2013, 2012 and 2011, respectively, as the revenue recorded exceeded amounts billed. Accrued rental income, as reported on the Consolidated Balance Sheets, represents cumulative rental income earned in excess of rent payments received pursuant to the terms of the individual lease agreements. The Company maintains an allowance against accrued rental income for future potential tenant credit losses. The credit assessment is based on the estimated accrued rental income that is recoverable over the term of the lease. The Company also maintains an allowance for doubtful accounts for estimated losses resulting from the inability of tenants to make required rent payments. The computation of this allowance is based on the tenants’ payment history and current credit status, as well as certain industry or geographic specific credit considerations. If the Company’s estimates of collectability differ from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. The credit risk is mitigated by the high quality of the Company’s existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of the Company’s portfolio to identify potential problem tenants.

In accordance with ASC 805, the Company recognizes rental revenue of acquired in-place “above-” and “below-market” leases at their fair values over the terms of the respective leases. The impact of the acquired in-place “above-” and “below-market” leases increased revenue by approximately $28.0 million, $14.6 million and $10.8 million for the years ended December 31, 2013, 2012 and 2011, respectively. The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2014	$	23,669	$	61,700
2015		22,758		55,207
2016		20,576		52,461
2017		12,279		40,346
2018		8,637		37,774

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred. Tenant reimbursements are recognized and presented in accordance with guidance in ASC 605-45 “Principal Agent Considerations” (“ASC 605-45”). ASC 605-45 requires that these reimbursements be recorded on a gross basis, as the Company is generally the primary obligor with respect to purchasing goods and services from third-party suppliers, has discretion in selecting the supplier and has credit risk. The Company also receives reimbursement of payroll and payroll related costs from third parties which the Company reflects on a net basis in accordance with ASC 605-45.

The Company’s parking revenues are derived from leases, monthly parking and transient parking. The Company recognizes parking revenue as earned.

The Company’s hotel revenues are derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenues are recognized as earned.

The Company receives management and development fees from third parties. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. The Company reviews each development agreement and records development fees as earned depending on the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

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Gains on sales of real estate are recognized pursuant to the provisions included in ASC 360-20 “Real Estate Sales” (“ASC 360-20”). The specific timing of a sale is measured against various criteria in ASC 360-20 related to the terms of the transaction and any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, the Company defers some or all of the gain recognition and accounts for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Ground Leases

The Company has non-cancelable ground lease obligations with various initial term expiration dates through 2068. The Company recognizes ground rent expense on a straight-line basis over the terms of the respective ground lease agreements. The future contractual minimum lease payments to be made by the Company as of December 31, 2013, under non-cancelable ground leases which expire on various dates through 2068, are as follows:

Years Ending December 31,	(in thousands)
2014	$	13,184
2015		13,507
2016		13,732
2017		13,963
2018		14,198
Thereafter		899,187

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings (if any) of certain securities issued by the Operating Partnership, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and securities of the Operating Partnership that are exchangeable for Common Stock.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, marketable securities, escrows, receivables, accounts payable, accrued expenses and other assets and liabilities are reasonable estimates of their fair values because of the short maturities of these instruments.

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The Company determines the fair value of its unsecured senior notes and unsecured exchangeable senior notes using market prices. The inputs used in determining the fair value of the Company’s unsecured senior notes and unsecured exchangeable senior notes is categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company uses quoted market rates to value these instruments. However, the inputs used in determining the fair value could be categorized at a level 2 basis if trading volumes are low. The Company determines the fair value of its mortgage notes payable using discounted cash flow analyses by discounting the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt based on current market rates for similar securities. In determining the current market rates, the Company adds its estimates of market spreads to the quoted yields on federal government treasury securities with similar maturity dates to its debt. The inputs used in determining the fair value of the Company’s mortgage notes payable and mezzanine notes payable are categorized at a level 3 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company considers the rates used in the valuation techniques to be unobservable inputs.

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Because the Company’s valuations of its financial instruments are based on these types of estimates, the actual fair values of its financial instruments may differ materially if the Company’s estimates do not prove to be accurate. The following table presents the aggregate carrying value of the Company’s indebtedness and the Company’s corresponding estimate of fair value as of December 31, 2013 and December 31, 2012 (in thousands):

	December 31, 2013					December 31, 2012
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,449,734		$	4,545,283	$	3,102,485		$	3,256,940
Mezzanine notes payable		311,040			311,064		—			—
Unsecured senior notes		5,835,854			6,050,517		4,639,528			5,162,486
Unsecured exchangeable senior notes		744,880	(1)		750,266		1,170,356	(1)		1,278,554
Total	$	11,341,508		$	11,657,130	$	8,912,369		$	9,697,980

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million and $25.5 million at December 31, 2013 and December 31, 2012, respectively.

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the consolidated balance sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for the effective portion of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the effective portion to earnings over the term that the hedged transaction affects earnings. The Company accounts for the ineffective portion of changes in the fair value of a derivative directly in earnings.

Income Taxes

The Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”), commencing with its taxable year ended December 31, 1997. As a result, the Company generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual taxable income. The Company’s policy is to distribute at least 100% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to the Company’s consolidated taxable REIT subsidiaries. The Company’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. The Company has no uncertain tax positions recognized as of December 31, 2013 and 2012.

The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of the Operating Partnership, is the lessee pursuant to the lease for the hotel property. As lessor, the Operating Partnership is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, the Company has recorded a tax provision in the Company’s Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011.

The net difference between the tax basis and the reported amounts of the Company’s assets and liabilities is approximately $1.7 billion and $0.8 billion as of December 31, 2013 and 2012, respectively, which is primarily related to the difference in basis of contributed property and accrued rental income.

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Certain entities included in the Company’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements.

The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	749,811		$	289,650		$	272,679
Straight-line rent adjustments		(74,445	)		(80,281	)		(77,422	)
Book/Tax differences from depreciation and amortization		170,370			105,599			117,675
Book/Tax differences on gains/losses from capital transactions		(124,413	)		(22,408	)		(38,443	)
Book/Tax differences from stock-based compensation		42,146			19,660			827
Other book/tax differences, net		(12,797	)		35,461			29,389
Taxable income	$	750,672		$	347,681		$	304,705

Stock-Based Employee Compensation Plans

At December 31, 2013, the Company has a stock-based employee compensation plan. Effective January 1, 2005, the Company adopted early ASC 718 “Compensation—Stock Compensation” (“ASC 718”), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.

Out-of-Period Adjustment

During the year ended December 31, 2012, the Company recorded additional real estate operating expenses totaling approximately $3.2 million related to the cumulative non-cash straight-line adjustment to the ground rent expense of certain ground leases that were not previously recognized on a straight-line basis. This resulted in the overstatement of real estate operating expenses by approximately $3.2 million during the year ended December 31, 2012 and in the understatement of real estate operating expenses in the aggregate amount of approximately $3.2 million in previous periods. Because this adjustment was not material to the prior years’ consolidated financial statements and the impact of recording the adjustment in the current period is not material to the Company’s consolidated financial statements, the Company recorded the related adjustment during the year ended December 31, 2012.

Reclassifications

The Company has modified the presentation of expenses to operate its San Francisco and Princeton regional offices to reflect the growing activity in its San Francisco region and to have a consistent presentation across the Company. These expenses, which totaled approximately $8.1 million, $7.7 million and $7.5 million for the years ended December 31, 2013, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

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Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income” (“ASU No. 2013-02”). ASU No. 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income, but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU No. 2013-02 is effective prospectively for reporting periods beginning after December 15, 2012. The Company’s adoption of ASU No. 2013-02 did not have a material impact on its consolidated financial statements.

3. Real Estate

Real estate consisted of the following at December 31 (in thousands):

	2013			2012
Land	$	4,450,532		$	2,605,162
Land held for future development		297,376			275,094
Buildings and improvements		11,065,113			9,517,343
Tenant improvements		1,617,401			1,435,508
Furniture, fixtures and equipment		25,164			23,441
Construction in progress		1,523,179			1,036,780
Total		18,978,765			14,893,328
Less: Accumulated depreciation		(3,161,571	)		(2,934,160	)
	$	15,817,194		$	11,959,168

Acquisitions

On February 6, 2013, the Company completed the acquisition of 535 Mission Street, a development site, in San Francisco, California for an aggregate purchase price of approximately $71.0 million in cash, including work completed and materials purchased to date. When completed, 535 Mission Street will consist of a 27-story, Class A office tower with approximately 307,000 net rentable square feet of office and retail space. The property is currently under development.

On March 26, 2013, a consolidated joint venture in which the Company has a 95% interest completed the acquisition of a land parcel in San Francisco, California that will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The purchase price for the land was approximately $192.0 million. On February 7, 2013, the partner in the joint venture issued a notice that it was electing under the joint venture agreement to reduce its nominal ownership interest in the venture from 50% to 5%. On February 26, 2013, the Company issued a notice to the partner electing to proceed with the venture on that basis. As a result, the Company has a 95% nominal interest in and is consolidating the joint venture (See Note 11). The initial phase of the development consisting of building the project to grade is currently under development.

On March 29, 2013, the Company completed the acquisition of a parcel of land located in Reston, Virginia for a purchase price of approximately $27.0 million. The land parcel is commercially zoned for 250,000 square feet of office space.

On April 10, 2013, the Company acquired the Mountain View Research Park and Mountain View Technology Park properties from Boston Properties Office Value-Added Fund, L.P. (the “Value-Added Fund”)

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for an aggregate net purchase price of approximately $233.1 million. Mountain View Research Park is a 16-building complex of Office/Technical properties aggregating approximately 604,000 net rentable square feet. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. The following table summarizes the allocation of the aggregate purchase price of Mountain View Research Park and Mountain View Technology Park at the date of acquisition (in thousands) in accordance with the guidance in ASC 805 “Business Combinations.”

Land	$	126,521
Building and improvements		82,451
Tenant improvements		7,326
In-place lease intangibles		23,279
Above-market rents		843
Below-market rents		(7,336	)
Net assets acquired	$	233,084

On May 31, 2013, the Company’s two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties. 767 Fifth Avenue (the General Motors Building) is a Class A office property totaling approximately 1.8 million net rentable square feet. In connection with the transfer, the Company and its new joint venture partners modified the Company’s relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in the Company having sufficient financial and operating control over 767 Venture, LLC such that, effective as of May 31, 2013, the Company accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting (See Notes 5 and 11). The following table summarizes the allocation of the aggregate purchase price of 767 Fifth Avenue (the General Motors Building) at the date of consolidation on May 31, 2013 (in thousands) in accordance with the guidance in ASC 805 “Business Combinations.”

Real estate and related intangibles recorded upon consolidation
Land	$	1,796,252
Building and improvements		1,447,446
Tenant improvements		85,208
In-place lease intangibles		357,781
Above market rents		101,897
Below market rents		(239,641	)
Above market assumed debt adjustments		(192,943	)
	$	3,356,000
Debt recorded upon consolidation
Mortgage notes payable	$	(1,300,000	)
Mezzanine notes payable		(306,000	)
Members’ notes payable		(450,000	)(1)
	$	(2,056,000	)
Working capital recorded upon consolidation
Cash and cash equivalents	$	79,468
Cash held in escrows		2,403
Tenant and other receivables		7,104
Prepaid expenses and other assets		4,269
Accounts payable and accrued expenses		(2,418	)
Accrued interest payable		(182,369	)(2)
Other liabilities		(6,304	)
	$	(97,847	)

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Noncontrolling interest recorded upon consolidation
Noncontrolling interests	$	(520,000	)
Noncontrolling interests—working capital		39,139
	$	(480,861	)
Net assets recorded upon consolidation	$	721,292

(1) The Company’s member loan totaling $270.0 million eliminates in consolidation.

(2) The Company’s share of the accrued interest payable on the members’ loans totaling approximately $105.5 million eliminates in consolidation.

Mountain View Research Park and Mountain View Technology Park contributed approximately $16.7 million of revenue and approximately $0.4 million of earnings to the Company for the period from April 10, 2013 through December 31, 2013. 767 Fifth Avenue (the General Motors Building) contributed approximately $168.4 million of revenue and approximately $8.4 million of earnings to the Company for the period from May 31, 2013 through December 31, 2013.

The accompanying unaudited pro forma information for the years ended December 31, 2013 and 2012 is presented as if the operating property acquisitions of (1) Mountain View Research Park and Mountain View Technology Park on April 10, 2013 and the approximately $26.5 million gain on consolidation and (2) 767 Fifth Avenue (the General Motors Building) on May 31, 2013 and the approximately $359.5 million gain on consolidation, had occurred on January 1, 2012. This unaudited pro forma information is based upon the historical consolidated financial statements of the Company and should be read in conjunction with the consolidated financial statements and notes thereto. This pro forma information does not purport to represent what the actual results of operations of the Company would have been had the above occurred, nor do they purport to predict the results of operations of future periods.

Pro Forma (Unaudited) (in thousands, except per share data)	Year ended December 31,
	2013		2012
Total revenue	$	2,257,098	$	2,149,391
Income from continuing operations	$	302,354	$	634,457
Net income attributable to Boston Properties, Inc.	$	400,017	$	626,174
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	2.58	$	4.15
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	2.57	$	4.13

Developments

On March 22, 2013, the Company completed and fully placed in-service Two Patriots Park, a Class A office redevelopment project with approximately 256,000 net rentable square feet located in Reston, Virginia.

On April 25, 2013, the Company commenced construction of its 601 Massachusetts Avenue, a Class A office development project totaling approximately 478,000 net rentable square feet located in Washington, DC.

On June 14, 2013, the Company completed and fully placed in-service Seventeen Cambridge Center, a Class A office project with approximately 195,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2013, the Company completed and fully placed in-service its Cambridge Center Connector, a Class A office project with approximately 43,000 net rentable square feet located in Cambridge, Massachusetts.

On October 29, 2013, the Company entered into a lease agreement as landlord with a third-party tenant for a build-to-suit project with approximately 130,000 net rentable square feet of Class A office space located in Princeton, New Jersey.

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As of December 31, 2013, the Company has placed in-service approximately 63% of The Avant at Reston Town Center development project comprised of 359 apartment units and retail space aggregating approximately 355,000 square feet located in Reston, Virginia (See Note 20).

As of December 31, 2013, the Company has placed in-service approximately 6% of its 250 West 55th Street development project. When completed, this project will consist of approximately 989,000 net rentable square feet of Class A office space located in New York City.

As of December 31, 2013, the Company has placed in-service approximately 1% of its 680 Folsom Street development project. When completed, this project will consist of approximately 525,000 net rentable square feet of Class A office space located in San Francisco, California.

Dispositions

On February 20, 2013, the foreclosure sale of the Company’s Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million. The operating results of the property through the date of ratification have been classified as discontinued operations on a historical basis for all periods presented.

On June 28, 2013, the Company completed the sale of its 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. Net cash proceeds totaled approximately $39.3 million. 303 Almaden Boulevard is a Class A office property totaling approximately 158,000 net rentable square feet. Because the Company entered into the related purchase and sale agreement on March 28, 2013 and the carrying value of the property exceeded its net sale price, the Company recognized an impairment loss totaling approximately $3.2 million during the three months ended March 31, 2013. As a result, there was no loss on sale of real estate recognized during the year ended December 31, 2013. The impairment loss and operating results of this property have been classified as discontinued operations on a historical basis for all periods presented. The sale of this asset caused the Company to reevaluate its strategy for development of its adjacent Almaden land parcel, which can accommodate an approximately 840,000 square feet office complex. Based on a shorter than expected hold period, the Company reduced the carrying value of the land parcel to its estimated fair market value and recognized an impairment loss of approximately $8.3 million during the three months ended March 31, 2013. The Company’s estimated fair value, as measured on a non-recurring basis, was based on comparable land sales. The Company has determined that its valuation of the land falls within Level 3 of the fair value hierarchy, as it has utilized significant unobservable inputs in its assessment.

On August 22, 2013, the Company completed the sale of its 1301 New York Avenue property located in Washington, DC for a net contract sale price of approximately $121.7 million. After adjusting for outstanding lease and other transaction costs assumed by the buyer, the gross sale price was approximately $135.0 million. Net cash proceeds totaled approximately $121.5 million, resulting in a gain on sale of approximately $86.4 million. 1301 New York Avenue is a Class A office property totaling approximately 201,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On October 9, 2013, the Company completed the sale of a 45% ownership interest in its Times Square Tower property for a gross sale price of $684.0 million in cash. Net cash proceeds totaled approximately $673.1 million, after the payment of transaction costs. In connection with the sale, the Company formed a joint venture with the buyer and will provide customary property management and leasing services to the joint venture. Times Square Tower is an approximately 1,246,000 net rentable square foot Class A office tower located in New York City. The transaction did not qualify as a sale of real estate for financial reporting purposes because the Company continues to control the joint venture and will therefore continue to account for the entity on a consolidated basis in its financial statements. The Company has accounted for the transaction as an equity

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transaction and has recognized noncontrolling interest in its consolidated balance sheets totaling approximately $243.5 million, which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction. The difference between the net cash proceeds received and the noncontrolling interest recognized, which difference totals approximately $429.6 million, has not been reflected as a gain on sale of real estate in the Company’s consolidated statements of operations and has instead been reflected as an increase to additional paid-in capital in the Company’s consolidated balance sheets.

On December 20, 2013, the Company completed the sale of its 10 & 20 Burlington Mall Road property located in Burlington, Massachusetts for a sale price of approximately $30.0 million. Net cash proceeds totaled approximately $29.4 million, resulting in a gain on sale of approximately $20.5 million. 10 & 20 Burlington Mall Road consists of two Class A office properties aggregating approximately 152,000 net rentable square feet. The operating results of the properties through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On December 20, 2013, the Company completed the sale of its One Preserve Parkway property located in Rockville, Maryland for a sale price of approximately $61.3 million. Net cash proceeds totaled approximately $59.9 million, resulting in a gain on sale of approximately $5.9 million. One Preserve Parkway is a Class A office property totaling approximately 184,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

The following table summarizes the income from discontinued operations related to One Preserve Parkway, 10 & 20 Burlington Mall Road, 1301 New York Avenue, 303 Almaden Boulevard, Montvale Center and Bedford Business Park and the related gains on sales of real estate, gain on forgiveness of debt and impairment loss for the years ended December 31, 2013, 2012 and 2011:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Total revenue	$	20,138		$	32,607		$	36,734
Expenses
Operating		6,996			12,038			13,818
Depreciation and amortization		4,760			8,169			9,442
Total expenses		11,756			20,207			23,260
Operating income		8,382			12,400			13,474
Other expense
Interest expense		360			2,594			2,598
Income from discontinued operations	$	8,022		$	9,806		$	10,876
Noncontrolling interest in income from discontinued operations—common units of the Operating Partnership		(803	)		(1,031	)		(1,243	)
Income from discontinued operations attributable to Boston Properties, Inc.	$	7,219		$	8,775		$	9,633
Gains on sales of real estate from discontinued operations	$	112,829		$	36,877		$	—
Gain on forgiveness of debt from discontinued operations		20,182			—			—
Impairment loss from discontinued operations		(3,241	)		—			—
Noncontrolling interest in gains on sales of real estate, gain on forgiveness of debt and impairment loss from discontinued operations—common units of the Operating Partnership		(13,348	)		(4,044	)		—
Gains on sales of real estate, gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	116,422		$	32,833		$	—

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4. Deferred Charges

Deferred charges consisted of the following at December 31, (in thousands):

	2013			2012
Leasing costs, including lease related intangibles	$	1,183,204		$	790,740
Financing costs		76,798			90,682
		1,260,002			881,422
Less: Accumulated amortization		(375,552	)		(293,187	)
	$	884,450		$	588,235

The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2014	$	91,903
2015		66,716
2016		55,083
2017		41,106
2018		36,306

5. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at December 31, 2013:

Entity	Properties	Nominal % Ownership
Square 407 Limited Partnership	Market Square North	50.0%
The Metropolitan Square Associates LLC	Metropolitan Square	51.0%
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0%(1)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3%(2)
RBP Joint Venture LLC	N/A	50.0%(3)
Boston Properties Office Value-Added Fund, L.P.	N/A	39.5%(4)
Annapolis Junction NFM, LLC	Annapolis Junction	50.0%(5)
2 GCT Venture LLC	N/A	60.0%(6)
540 Madison Venture LLC	540 Madison Avenue	60.0%
125 West 55th Street Venture LLC	N/A	60.0%(7)
500 North Capitol LLC	500 North Capitol Street, NW	30.0%

(1) The Company’s economic ownership can increase based on the achievement of certain return thresholds.

(2) The Company’s wholly-owned entity that owns the office component of the project also owns a 33.3% interest in the entity owning the land, parking and infrastructure of the project.

(3) Eighth Avenue and 46th Street was sold on July 19, 2013.

(4) The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013 (See Note 3). As of December 31, 2013, the investment is comprised of undistributed cash.

(5) Comprised of two buildings, one building under construction and two undeveloped land parcels.

(6) Two Grand Central Tower was sold on October 25, 2011. As of December 31, 2013, the investment is comprised of undistributed cash.

(7) 125 West 55th Street was sold on May 30, 2013. As of December 31, 2013, the investment is comprised of undistributed cash.

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Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures at an agreed upon fair value. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

The combined summarized balance sheets of the unconsolidated joint ventures are as follows:

	December 31, 2013			December 31, 2012
	(in thousands)
ASSETS
Real estate and development in process, net	$	924,297		$	4,494,971
Other assets		163,149			673,716
Total assets	$	1,087,446		$	5,168,687
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	749,732		$	3,039,922
Other liabilities		28,830			792,888
Members’/Partners’ equity		308,884			1,335,877
Total liabilities and members’/partners’ equity	$	1,087,446		$	5,168,687
Company’s share of equity	$	154,726		$	787,941
Basis differentials (1)		(28,642	)		(128,025	)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	126,084		$	659,916

(1) This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.

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The combined summarized statements of operations of the joint ventures are as follows:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Total revenue (1)	$	311,548		$	564,205		$	589,294
Expenses
Operating		105,319			162,665			170,404
Depreciation and amortization		86,088			163,134			190,437
Impairment losses		—			—			40,468
Total expenses		191,407			325,799			401,309
Operating income		120,141			238,406			187,985
Other income (expense)
Interest expense		(112,535	)		(224,645	)		(228,494	)
Losses from early extinguishments of debt		(1,677	)		—			—
Income (loss) from continuing operations		5,929			13,761			(40,509	)
Gains on sales of real estate		14,207			990			—
Net income (loss)	$	20,136		$	14,751		$	(40,509	)
Company’s share of net income (loss)	$	4,612		$	6,863		$	(25,374	)
Gains on sales of real estate		54,501			—			46,166
Basis differential		(1,017	)		1,732			27,226
Elimination of inter-entity interest on partner loan		16,978			40,483			37,878
Income from unconsolidated joint ventures	$	75,074		$	49,078		$	85,896
Gains on consolidation of joint ventures	$	385,991		$	—		$	—

(1) Includes straight-line rent adjustments of $7.8 million, $12.0 million and $21.9 million for the years ended December 31, 2013, 2012 and 2011, respectively. Includes net below-market rent adjustments of $33.7 million, $91.1 million and $120.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. Total revenue for the year ended December 31, 2012 includes termination income totaling approximately $19.6 million (of which the Company’s share is approximately $11.8 million) related to a lease termination with a tenant at 767 Fifth Avenue (The General Motors Building).

On February 28, 2013, a joint venture in which the Company has a 50% interest completed and fully placed in-service Annapolis Junction Building Six, a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

On March 31, 2013, a joint venture in which the Company has a 30% interest completed and fully placed in-service 500 North Capitol Street, NW, a Class A office redevelopment project with approximately 231,000 net rentable square feet located in Washington, DC.

On April 4, 2013, a joint venture in which the Company has a 50% interest obtained construction financing collateralized by its Annapolis Junction Building Seven development project located in Annapolis, Maryland totaling $22.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on April 4, 2016, with two, one-year extension options, subject to certain conditions.

On April 10, 2013, the Company acquired the Mountain View Research Park and Mountain View Technology Park properties from its Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. In conjunction with the acquisition, the Value-Added Fund repaid the mortgage loans collateralized by the Mountain View Research Park and Mountain View Technology Park properties totaling approximately $90.0 million and $20.0 million, respectively, as well as the outstanding loans payable to the

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Company’s Operating Partnership totaling approximately $8.6 million and $3.7 million, respectively. The Mountain View Research Park and Mountain View Technology Park mortgage loans bore interest at variable rates equal to LIBOR plus 2.00% per annum and LIBOR plus 2.50% per annum, respectively, and were scheduled to mature on May 31, 2014 and November 22, 2014, respectively. The joint venture recognized a loss on early extinguishment of debt totaling approximately $0.4 million, of which the Company’s share was approximately $0.2 million, consisting of the write-off of unamortized deferred financing costs. Prior to the acquisition, the Company’s ownership interest in the properties was approximately 39.5%. As a result of the acquisition, the Company owns 100% of the properties and is accounting for them on a consolidated basis (See Note 3). The Company had previously recognized an impairment loss on its investment in the unconsolidated joint venture. As a result, the Company recognized a gain on its investment of approximately $26.5 million, which is included within gains on consolidation of joint ventures in the Company’s consolidated statements of operations.

On May 30, 2013, a joint venture in which the Company has a 60% interest completed the sale of its 125 West 55th Street property located in New York City for a sale price of $470.0 million, including the assumption by the buyer of the mortgage loan collateralized by the property totaling approximately $198.6 million. The mortgage loan bore interest at a fixed rate of 6.09% per annum and was scheduled to mature on March 10, 2020. Net cash proceeds totaled approximately $253.7 million, of which the Company’s share was approximately $152.2 million, after the payment of transaction costs. 125 West 55th Street is a Class A office property totaling approximately 588,000 net rentable square feet. The Company had previously recognized an impairment loss on its investment in the unconsolidated joint venture. As a result, the Company recognized a gain on sale of real estate totaling approximately $43.2 million, which is included within income from unconsolidated joint ventures in the Company’s consolidated statements of operations.

On May 31, 2013, the Company’s two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, the Company and its new joint venture partners modified the Company’s relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in the Company having sufficient financial and operating control over 767 Venture, LLC such that the Company now accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting (See Note 3). Upon consolidation, the Company recognized a non-cash gain on its investment of approximately $359.5 million, which is included within gains on consolidation of joint ventures in the Company’s consolidated statements of operations.

On May 31, 2013, a joint venture in which the Company has a 30% interest refinanced its construction loan collateralized by 500 North Capitol Street, NW located in Washington, DC. The construction loan totaling approximately $90.6 million bore interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on October 14, 2014. The joint venture recognized a loss on early extinguishment of debt totaling approximately $1.0 million, of which the Company’s share was approximately $0.3 million, consisting of the write-off of unamortized deferred financing costs. The new mortgage loan totaling $105.0 million requires interest only payments at a fixed interest rate of 4.15% per annum and matures on June 6, 2023.

On June 5, 2013, a joint venture in which the Company has a 60% interest refinanced its mortgage loans collateralized by 540 Madison Avenue located in New York City. The mortgage loans aggregating approximately $118.0 million bore interest at a weighted-average fixed rate of 5.20% per annum and were scheduled to mature on July 11, 2013. The joint venture recognized a loss on early extinguishment of debt totaling approximately $0.3 million, of which the Company’s share was approximately $0.2 million, related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting. The new mortgage loan totaling $120.0 million requires interest only payments at a variable rate equal to LIBOR plus 1.50% per annum and matures on June 5, 2018.

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On July 19, 2013, a joint venture in which the Company has a 50% interest completed the sale of its Eighth Avenue and 46th Street project located in New York City for an imputed sale price of $45.0 million. The Eighth Avenue and 46th Street project is comprised of an assemblage of land parcels and air-rights. Net cash proceeds to the Company totaled approximately $21.8 million, after the payment of transaction costs. The joint venture had previously recognized an impairment loss on the property. As a result, the joint venture recognized a gain on sale of real estate totaling approximately $12.6 million, of which the Company’s share was approximately $11.3 million. The Company’s share of the gain on sale of real estate is reflective of the Company’s share of the net proceeds from the imputed sale price and is included within income from unconsolidated joint ventures in the Company’s consolidated statements of operations.

On September 26, 2013, a joint venture in which the Company has a 50% interest entered into a lease agreement for its Annapolis Junction Building Seven development project. Annapolis Junction Building Seven when completed will consist of a Class A office property with approximately 125,000 net rentable square feet located in Annapolis, Maryland.

On October 29, 2013, a joint venture in which the Company has a 50% interest exercised an option to extend the maturity date to November 17, 2014 of the construction financing collateralized by its Annapolis Junction Building Six property. The construction financing totaling approximately $14.0 million bears interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on November 17, 2013. Annapolis Junction Building Six is a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

6. Mortgage Notes Payable

The Company had outstanding mortgage notes payable totaling approximately $4.4 billion and $3.1 billion as of December 31, 2013 and 2012, respectively, each collateralized by one or more buildings and related land included in real estate assets. The mortgage notes payable are generally due in monthly installments and mature at various dates through April 10, 2022.

Fixed rate mortgage notes payable totaled approximately $4.4 billion and $3.1 billion at December 31, 2013 and 2012, respectively, with contractual interest rates ranging from 4.75% to 7.69% per annum at December 31, 2013 and 4.75% to 9.93% per annum at December 31, 2012 (with weighted-averages of 5.70% (excluding the mezzanine notes payable) and 5.65% at December 31, 2013 and 2012, respectively).

There were no variable rate mortgage loans at December 31, 2013 and December 31, 2012. As of December 31, 2013 and 2012, the LIBOR rate was 0.17% and 0.21%, respectively.

On February 5, 2013, the Company used available cash to repay the mortgage loan collateralized by its Kingstowne One property located in Alexandria, Virginia totaling approximately $17.0 million. The mortgage loan bore interest at a fixed rate of 5.96% per annum and was scheduled to mature on May 5, 2013. There was no prepayment penalty.

On February 20, 2013, the foreclosure sale of the Company’s Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million. The operating results of the property through the date of ratification have been classified as discontinued operations on a historical basis for all periods (See Note 3).

On April 1, 2013, the Company used available cash to repay the mortgage loan collateralized by its 140 Kendrick Street property located in Needham, Massachusetts totaling approximately $47.6 million. The mortgage loan bore interest at a fixed rate of 7.51% per annum and was scheduled to mature on July 1, 2013. There was no prepayment penalty. The Company recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

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On May 31, 2013, in conjunction with the consolidation of the Company’s 767 Venture, LLC joint venture (the entity that owns 767 Fifth Avenue (the General Motors Building), the Company recorded mortgage loans collateralized by the property aggregating $1.3 billion and mezzanine loans aggregating $306.0 million. The mortgage loans require interest-only payments at a weighted-average fixed interest rate of 5.95% per annum and mature on October 7, 2017. The mezzanine loans require interest-only payments at a weighted-average fixed interest rate of 6.02% per annum and mature on October 7, 2017. The mortgage loans and mezzanine loans were recorded at their fair values aggregating approximately $1.5 billion and $311.7 million, respectively, using weighted-average effective interest rates of approximately 2.44% and 5.53% per annum, respectively. In addition, in conjunction with the consolidation, the Company recorded loans payable to the joint venture’s partners totaling $450.0 million and related accrued interest payable totaling approximately $175.8 million. The member loans bear interest at a fixed rate of 11.0% per annum and mature on June 9, 2017. The member loans consist of the portion of the original purchase price for the property that was financed with loans from the joint venture’s partners on a pro rata basis. The Company has eliminated in consolidation its member loan totaling $270.0 million and its share of the related accrued interest payable of approximately $114.5 million at December 31, 2013. The remaining notes payable to the outside joint venture partners and related accrued interest payable totaling $180.0 million and approximately $76.4 million as of December 31, 2013 have been reflected as Outside Members’ Notes Payable and within Accrued Interest Payable, respectively, on the Consolidated Balance Sheets (See Note 3). The related interest expense from the Outside Member’s Notes Payable totaling approximately $16.0 million for the period from May 31, 2013 through December 31, 2013 is fully allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in the Company’s Consolidated Statements of Operations.

Four mortgage loans totaling approximately $2.2 billion at December 31, 2013 and five mortgage loans totaling approximately $951.5 million at December 31, 2012 have been accounted for at their fair values on the dates the mortgage loans were assumed. The impact of recording the mortgage loans at fair value resulted in a decrease to interest expense of approximately $34.4 million, $7.0 million and $9.2 million for the years ended December 31, 2013, 2012 and 2011, respectively. The cumulative liability related to the fair value adjustments was $191.2 million and $38.6 million at December 31, 2013 and 2012, respectively, and is included in mortgage notes payable in the Consolidated Balance Sheets.

Contractual aggregate principal payments of mortgage notes payable at December 31, 2013 are as follows:

	Principal Payments
	(in thousands)
2014	$	87,759
2015		26,182
2016		608,879
2017		2,821,750
2018		18,633
Thereafter		695,327
Total aggregate principal payments		4,258,530
Unamortized balance of historical fair value adjustments		191,204
Total carrying value of mortgage notes payable	$	4,449,734

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7. Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Principal Amount			Maturity Date(2)
12 Year Unsecured Senior Notes		5.625	%		5.693	%	$	300,000		April 15, 2015
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000		June 1, 2015
10 Year Unsecured Senior Notes		5.875	%		5.967	%		700,000		October 15, 2019
10 Year Unsecured Senior Notes		5.625	%		5.708	%		700,000		November 15, 2020
10 Year Unsecured Senior Notes		4.125	%		4.289	%		850,000		May 15, 2021
7 Year Unsecured Senior Notes		3.700	%		3.853	%		850,000		November 15, 2018
11 Year Unsecured Senior Notes		3.850	%		3.954	%		1,000,000		February 1, 2023
10.5 Year Unsecured Senior Notes		3.125	%		3.279	%		500,000		September 1, 2023
10.5 Year Unsecured Senior Notes		3.800	%		3.916	%		700,000		February 1, 2024
Total principal								5,850,000
Net unamortized discount								(14,146	)
Total							$	5,835,854

(1) Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.

(2) No principal amounts are due prior to maturity.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At December 31, 2013, the Company was in compliance with each of these financial restrictions and requirements.

On April 11, 2013, the Company’s Operating Partnership completed a public offering of $500.0 million in aggregate principal amount of its 3.125% senior unsecured notes due 2023. The notes were priced at 99.379% of the principal amount to yield an effective rate (including financing fees) of 3.279% to maturity. The notes will mature on September 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $492.5 million after deducting underwriting discounts and transaction expenses.

On June 27, 2013, the Company’s Operating Partnership completed a public offering of $700.0 million in aggregate principal amount of its 3.800% senior unsecured notes due 2024. The notes were priced at 99.694% of the principal amount to yield an effective rate (including financing fees) of 3.916% to maturity. The notes will mature on February 1, 2024, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $691.9 million after deducting the underwriting discount and transaction expenses.

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8. Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate (1)			Exchange Rate			Principal Amount			First Optional Redemption Date  by the Company	Maturity Date
3.625% Exchangeable Senior Notes		3.625	%		4.037	%		8.6974	(2)	$	747,500		N/A	February 15, 2014
Net unamortized discount											(182	)
Adjustment for the equity component allocation, net of accumulated amortization											(2,438	)
Total										$	744,880

(1) Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustments), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. In connection with the special dividend declared on November 27, 2013, the exchange rate of 8.5051 was adjusted to 8.6974 shares per $1,000 principal amount of notes effective as of December 31, 2013, resulting in an exchange price of approximately $114.98 per share of Boston Properties, Inc.’s common stock. As of December 31, 2013, the effective exchange price was $130.21 per share. The Operating Partnership repaid the notes on February 18, 2014 (See Note 20).

ASC 470-20 requires the liability and equity components of convertible debt instruments that may be settled in cash upon conversion (including partial cash settlement) to be separately accounted for in a manner that reflects the issuer’s nonconvertible debt borrowing rate. ASC 470-20 requires that the initial proceeds from the sale of the Operating Partnership’s $862.5 million of 2.875% exchangeable senior notes due 2037 (all of which had been redeemed/repurchased as of December 31, 2012), $450.0 million of 3.75% exchangeable senior notes due 2036 (all of which have been redeemed/repurchased as of December 31, 2013) and $747.5 million of 3.625% exchangeable senior notes due 2014 (see Note 20) be allocated between a liability component and an equity component in a manner that reflects interest expense at the interest rate of similar nonconvertible debt that could have been issued by the Operating Partnership at such time. The Company measured the fair value of the debt components of the 2.875%, 3.75% and 3.625% exchangeable senior notes for the periods presented based on effective interest rates of 5.630%, 5.958% and 6.555%, respectively. The aggregate carrying amount of the debt component was approximately $744.9 million and $1.17 billion (net of the equity component allocation adjustment of approximately $2.4 million and $25.5 million) at December 31, 2013 and December 31, 2012, respectively. As a result, the Company attributed an aggregate of approximately $230.3 million of the proceeds to the equity component of the notes, which represents the excess proceeds received over the fair value of the notes at the date of issuance. The equity component of the notes has been reflected within Additional Paid-in Capital in the Consolidated Balance Sheets. The Company reclassified approximately $1.0 million of deferred financing costs to Additional Paid-in Capital, which represented the costs attributable to the equity components of the notes. The carrying amount of the equity component was approximately $91.9 million and $148.5 million at December 31, 2013 and December 31, 2012, respectively. The resulting debt discount has been amortized over

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the period during which the debt was expected to be outstanding (i.e., through the first optional redemption dates or, in the case of the 2014 notes, the maturity date) as additional non-cash interest expense. The aggregate contractual interest expense was approximately $34.8 million, $48.4 million and $66.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. As a result, the Company reported additional non-cash interest expense of approximately $23.1 million, $29.1 million and $38.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.

On April 15, 2013, the Company announced that holders of its Operating Partnership’s 3.75% Exchangeable Senior Notes due 2036 (the “Notes”) had the right to surrender their Notes for purchase by the Operating Partnership (the “Put Right”) on May 18, 2013. On April 15, 2013, the Company also announced that the Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on May 18, 2013 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the notice of redemption, holders of the Notes had the right to exchange their Notes on or prior to May 16, 2013. Notes with respect to which the Put Right was not exercised and that were not surrendered for exchange on or prior to May 16, 2013, were redeemed by the Operating Partnership at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon to, but excluding, the Redemption Date. Based on final information provided to the Operating Partnership by the trustee for the Notes, no Notes were validly tendered and accepted for purchase in the Put Right. Pursuant to the notice of redemption, an aggregate principal amount of $990,000 of the Notes was redeemed on May 18, 2013. The remaining aggregate principal amount of $449,010,000 of the Notes was surrendered for exchange and, in addition to the repayment of the principal in cash, the Company issued an aggregate of 419,116 shares of its common stock in exchange for the Notes (See Note 12). The Company recognized a loss on early extinguishment of debt totaling approximately $0.1 million consisting of transaction costs.

9. Unsecured Line of Credit 

On July 26, 2013, the Company’s Operating Partnership amended and restated the revolving credit agreement governing the Company’s Unsecured Line of Credit, which, among other things, (1) increased the total commitment from $750.0 million to $1.0 billion, (2) extended the maturity date from June 24, 2014 to July 26, 2018 and (3) reduced the per annum variable interest rates and other fees. The Operating Partnership may increase the total commitment to $1.5 billion, subject to syndication of the increase and other conditions. At the Operating Partnership’s option, loans outstanding under the Unsecured Line of Credit will bear interest at a rate per annum equal to (1), in the case of loans denominated in Dollars, Euro or Sterling, LIBOR or, in the case of loans denominated in Canadian Dollars, CDOR, in each case, plus a margin ranging from 0.925% to 1.70% based on the Operating Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Administrative Agent’s prime rate, (b) the Federal Funds rate plus 0.5% or (c) LIBOR for a one month period plus 1.00%, in each case, plus a margin ranging from 0.0% to 0.70% based on the Operating Partnership’s credit rating. The Unsecured Line of Credit also contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loan advances to the Operating Partnership at a reduced interest rate. In addition, the Operating Partnership is also obligated to pay (1) in quarterly installments a facility fee on the total commitment at a rate per annum ranging from 0.125% to 0.35% based on the Operating Partnership’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit equal to the LIBOR margin. Based on the Operating Partnership’s current credit rating, the LIBOR and CDOR margin is 1.00%, the alternate base rate margin is 0.0% and the facility fee is 0.15%. At December 31, 2013 and 2012, there were no amounts outstanding on the Unsecured Line of Credit.

The terms of the Unsecured Line of Credit require that the Company maintain a number of customary financial and other covenants on an ongoing basis, including: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (5) an unsecured debt interest coverage

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ratio of at least 1.75 and (6) limitations on permitted investments. At December 31, 2013, the Company was in compliance with each of these financial and other covenant requirements.

10. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises.

The Company has letter of credit and performance obligations of approximately $13.9 million related to lender and development requirements.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of the property or its interest in the joint ventures. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners. See also Noncontrolling Interest—Redeemable Interest in Property Partnership in Note 11.

In connection with the assumption of 767 Fifth Avenue’s (the General Motors Building) secured loan by the Company’s consolidated joint venture, 767 Venture, LLC, the Company guaranteed the consolidated joint venture’s obligation to fund various escrows, including tenant improvements, taxes and insurance in lieu of cash deposits. As of December 31, 2013, the maximum funding obligation under the guarantee was approximately $24.1 million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee.

In connection with the mortgage financing collateralized by the Company’s John Hancock Tower property located in Boston, Massachusetts, the Company has agreed to guarantee approximately $15.9 million related to its obligation to provide funds for certain tenant re-leasing costs. The mortgage financing matures on January 6, 2017.

From time to time, the Company (or the applicable joint venture) has also agreed to guarantee portions of the principal, interest or other amounts in connection with other unconsolidated joint venture borrowings. In addition to the financial guarantees referenced above, the Company has agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) on certain of its unconsolidated joint venture loans.

Concentrations of Credit Risk

Management of the Company performs ongoing credit evaluations of tenants and may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees. Although the Company’s properties are geographically diverse and the tenants operate in a variety of industries, to the extent the Company has a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on the Company.

Some potential losses are not covered by insurance.

The Company carries insurance coverage on its properties of types and in amounts and with deductibles that it believes are in line with coverage customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market following the terrorist attacks of September 11, 2001, the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) was enacted in November 2002 to require regulated insurers to make

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available coverage for “certified” acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to December 31, 2014 by the Terrorism Risk Insurance Program Reauthorization Act of 2007 (“TRIPRA”) and the Company can provide no assurance that it will be extended further. Currently, the Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism certified under TRIA other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billion of coverage in the Company’s property insurance program which is provided by IXP, LLC (“IXP”) as a direct insurer. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage, with $1.375 billion of Terrorism Coverage in excess of $250 million being provided by NYXP, LLC (“NYXP”), as a direct insurer. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIA (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the additional Terrorism Coverage provided by IXP for 601 Lexington Avenue, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $100.0 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in its portfolio or for any other reason. In the event TRIPRA is not extended beyond December 31, 2014, (i) the Company will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing its overall cost of insurance, (ii) if such insurance is not available at commercially reasonable rates with limits equal to its current coverage or at all, the Company may not continue to have full occurrence limit coverage for acts of terrorism, (iii) the Company may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (iv) the Company may not be able to obtain future debt financings secured by individual properties and (v) the Company may cancel the insurance policies issued by IXP for the NBCR Coverage and the additional Terrorism Coverage for 601 Lexington Avenue and by NYXP for the Terrorism Coverage for 767 Fifth Avenue. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that the Company believes are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically, the Company currently carries earthquake insurance which covers its San Francisco region (excluding 535 Mission Street and the below grade improvements for Transbay Tower) with a $120 million per occurrence limit and a $120 million annual aggregate limit, $20 million of which is provided by IXP, as a direct insurer. The builders risk policy maintained for the development of 535 Mission Street in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. In addition, the builders risk policy maintained for the development of the below grade improvements of the Transbay Tower in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. The amount of the Company’s earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact the Company’s ability to finance properties subject to earthquake risk. The Company may discontinue earthquake insurance or change the structure of its earthquake insurance program on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.

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IXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s earthquake insurance coverage for its Greater San Francisco properties, the additional Terrorism Coverage for 601 Lexington Avenue and the Company’s NBCR Coverage. The additional Terrorism Coverage provided by IXP for 601 Lexington Avenue only applies to losses which exceed the program trigger under TRIA. NYXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s Terrorism Coverage for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program trigger under TRIA and NYXP reinsures with a third-party insurance company any coinsurance payable under TRIA. Insofar as the Company owns IXP and NYXP, it is responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of the Company’s consolidated financial statements. In particular, if a loss occurs which is covered by the Company’s NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If the Company experiences a loss and IXP or NYXP are required to pay under their insurance policies, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, the Operating Partnership has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

The mortgages on the Company’s properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identity of the insurance companies in the Company’s insurance programs. The ratings of some of the Company’s insurers are below the rating requirements in some of the Company’s loan agreements and the lenders for these loans could attempt to claim that an event of default has occurred under the loan. The Company believes it could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future, the Company’s ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers or amounts of insurance which are difficult to obtain or which result in a commercially unreasonable premium. There can be no assurance that a deficiency in the financial ratings of one or more of the Company’s insurers will not have a material adverse effect on the Company.

The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but the Company cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which the Company cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect the Company’s business and financial condition and results of operations.

Legal Matters

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on the financial position, results of operations or liquidity of the Company.

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State and Local Tax Matters

Because the Company is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which the Company owns real estate either have undergone, or are currently undergoing, tax audits. Although the Company believes that it has substantial arguments in favor of its positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on the Company’s results of operations.

Environmental Matters

It is the Company’s policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with the Company’s acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that the Company believes will have a material adverse effect on its business, assets, financial condition, results of operations or liquidity, and the Company is not otherwise aware of environmental conditions with respect to its properties that the Company believes would have such a material adverse effect. However, from time to time environmental conditions at the Company’s properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, the Company (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. The Company developed an office park on the property. The Company engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to the Company’s ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify the Company for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges.

Environmental investigations at some of the Company’s properties and certain properties owned by affiliates of the Company have identified groundwater contamination migrating from off-site source properties. In each case the Company engaged a licensed environmental consultant to perform the necessary investigations and assessments and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. The Company also believes that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although the Company believes that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, the Company will take such further response actions (if any) that it deems necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time.

Some of the Company’s properties and certain properties owned by the Company’s affiliates are located in urban, industrial and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development,

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construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations it is the Company’s practice to investigate the nature and extent of detected contamination and estimate the costs of required response actions and special handling procedures. The Company then uses this information as part of its decision- making process with respect to the acquisition and/or development of the property. For example, the Company owns a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. The Company has developed an office park on this property. Prior to and during redevelopment activities, the Company engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws.

The Company expects that resolution of the environmental matters relating to the above will not have a material impact on its business, assets, financial condition, results of operations or liquidity. However, the Company cannot assure you that it has identified all environmental liabilities at its properties, that all necessary remediation actions have been or will be undertaken at the Company’s properties or that the Company will be indemnified, in full or at all, in the event that such environmental liabilities arise.

Tax Protection Obligations

In connection with the acquisition or contribution of three properties, the Company entered into agreements for the benefit of the selling or contributing parties which specifically state that until such time as the contributors do not hold at least a specified percentage of the OP Units owned by such person following the contribution of the properties, or until June 9, 2017 for 767 Fifth Avenue (the General Motors Building), the Operating Partnership will not sell or otherwise transfer the properties in a taxable transaction. If the Company does sell or transfer the properties in a taxable transaction, it would be liable to the contributors for contractual damages.

11. Noncontrolling Interests

Noncontrolling interests relate to the interests in the Operating Partnership not owned by the Company and interests in consolidated property partnerships not wholly-owned by the Company. As of December 31, 2013, the noncontrolling interests consisted of 15,583,370 OP Units, 1,455,761 LTIP Units, 396,500 2011 OPP Units, 396,150 2012 OPP Units, 316,325 2013 MYLTIP Units, 666,116 Series Two Preferred Units (or 874,168 OP Units on an as converted basis) and 360,126 Series Four Preferred Units (not convertible into OP Units) held by parties other than the Company.

Noncontrolling Interest—Redeemable Preferred Units of the Operating Partnership

The Preferred Units at December 31, 2013 consisted of 666,116 Series Two Preferred Units, which bear a preferred distribution equal to the greater of (1) the distribution which would have been paid in respect of the Series Two Preferred Unit had such Series Two Preferred Unit been converted into an OP Unit (including both regular and special distributions) or (2) 6.00% per annum on a liquidation preference of $50.00 per unit, and are convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). The holders of Series Two Preferred Units have the right to require the Operating Partnership to redeem their units for cash at the redemption price of $50.00 per unit on May 12, 2014. The holders also had the right to have their Series Two Preferred Units redeemed for cash on May 12, 2009, May 12, 2010, May 12, 2011, May 14, 2012 and May 14, 2013, although no holder exercised such right. Due to the holders’ redemption option existing outside the control of the Company, the Series Two Preferred Units are presented outside of permanent equity in the Company’s Consolidated Balance Sheets. In May 2014, the Company also has the right, subject to certain

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conditions, to call for redemption all of the outstanding Series Two Preferred Units for cash or to convert into OP Units any Series Two Preferred Units that have not been previously redeemed. In the event the Company calls the Series Two Preferred Units for redemption, the holders shall have the right to convert the Series Two Preferred Units into OP Units.

During the years ended December 31, 2013 and 2012, 329,881 and 117,047 Series Two Preferred Units of the Operating Partnership, respectively, were converted by the holders into 432,914 and 153,605 OP Units, respectively. In addition, the Company paid the accrued preferred distributions due to the holders of Preferred Units that were converted.

On February 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. On May 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. On August 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. On November 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit.

The Preferred Units at December 31, 2013 also included 360,126 Series Four Preferred Units, which bear a preferred distribution equal to 2.00% per annum on a liquidation preference of $50.00 per unit and are not convertible into OP Units. In order to secure the performance of certain obligations by the holders, such Series Four Preferred Units are subject to forfeiture pursuant to the terms of a pledge agreement. The holders of Series Four Preferred Units have the right, at certain times and subject to certain conditions set forth in the Certificate of Designations establishing the rights, limitations and preferences of the Series Four Preferred Units, to require the Operating Partnership to redeem all of their their units for cash at the redemption price of $50.00 per unit. The Operating Partnership also has the right, at certain times and subject to certain conditions, to redeem all of the Series Four Preferred Units for cash at the redemption price of $50.00 per unit. The Series Four Preferred Units that are subject to the security interest under the pledge agreement may not be redeemed until and unless such security interest is released. The Operating Partnership’s first right to redeem the Series Four Preferred Units was a 30-day period beginning on August 29, 2013. Due to the holders’ redemption option existing outside the control of the Company, the Series Four Preferred Units are presented outside of permanent equity in the Company’s Consolidated Balance Sheets. On August 29, 2013, the Company’s Operating Partnership redeemed approximately 861,400 Series Four Preferred Units for cash at the redemption price of $50.00 per unit plus accrued and unpaid distributions through the redemption date.

On February 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On May 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On August 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On November 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit.

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The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the years ended December 31, 2013, 2012 and 2011 (in thousands):

Balance at December 31, 2010	$	55,652
Net income		3,339
Distributions		(3,339	)
Balance at December 31, 2011	$	55,652
Issuance of redeemable preferred units (Series Four Preferred Units)		79,405
Net income		3,497
Distributions		(3,497	)
Redemption of redeemable preferred units (Series Four Preferred Units)		(18,329	)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units		(5,852	)
Balance at December 31, 2012	$	110,876
Net income		6,046
Distributions		(6,046	)
Redemption of redeemable preferred units (Series Four Preferred Units)		(43,070	)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units		(16,494	)
Balance at December 31, 2013	$	51,312

Noncontrolling Interest—Redeemable Interest in Property Partnership

On October 4, 2012, the Company completed the formation of a joint venture, which owns and operates Fountain Square located in Reston, Virginia. The joint venture partner contributed the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a nominal 50% interest in the joint venture. The Company contributed cash totaling approximately $87.0 million for its nominal 50% interest, which cash was distributed to the joint venture partner. Pursuant to the joint venture agreement (i) the Company has rights to acquire the partner’s nominal 50% interest and (ii) the partner has the right to cause the Company to acquire the partner’s interest on January 4, 2016, in each case at a fixed price totaling approximately $102.0 million in cash. The fixed price option rights expire on January 31, 2016. The Company is consolidating this joint venture due to the Company’s right to acquire the partner’s nominal 50% interest. The Company initially recorded the noncontrolling interest at its acquisition-date fair value as temporary equity, due to the redemption option existing outside the control of the Company. The Company will accrete the changes in the redemption value quarterly over the period from the acquisition date to the earliest redemption date using the effective interest method. The Company will record the accretion after the allocation of net income and distributions of cash flow to the noncontrolling interest account balance.

The following table reflects the activity of the noncontrolling interest—redeemable interest in property partnership in the Company’s Fountain Square consolidated joint venture for the for the years ended December 31, 2013 and 2012 (in thousands):

Balance at December 31, 2011	$	—
Acquisition-date fair value of redeemable interest		98,787
Net loss		(719	)
Distributions		(3,032	)
Adjustment to reflect redeemable interest at redemption value		2,522
Balance at December 31, 2012	$	97,558
Net loss		(1,839	)
Distributions		(4,585	)
Adjustment to reflect redeemable interest at redemption value		8,475
Balance at December 31, 2013	$	99,609

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Noncontrolling Interest—Common Units of the Operating Partnership

During the years ended December 31, 2013 and 2012, 929,441 and 1,110,660 OP Units, respectively, were presented by the holders for redemption (including 432,914 and 153,605 OP Units, respectively, issued upon conversion of Series Two Preferred Units and 24,028 and 544,729 OP Units, respectively, issued upon conversion of LTIP Units) and were redeemed by the Company in exchange for an equal number of shares of Common Stock.

At December 31, 2013, the Company had outstanding 396,500 2011 OPP Units and 396,150 2012 OPP Units and 316,325 2013 MYLTIP Units (See Note 17). Prior to the measurement date (January 31, 2014 for 2011 OPP Units (See Note 20), February 6, 2015 for 2012 OPP Units and February 4, 2016 for 2013 MYLTIP Units), holders of OPP Units and 2013 MYLTIP Units are entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the measurement date, the number of OPP Units and 2013 MYLTIP Units, both vested and unvested, that OPP and 2013 MYLTIP award recipients have earned, if any, based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit.

On January 29, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2011 OPP Units and 2012 OPP Units in the amount of $0.065 per unit, to holders of record as of the close of business on December 31, 2012. On April 30, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on March 29, 2013. On July 31, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on June 28, 2013. On October 31, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit and a distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on September 30, 2013. On November 27, 2013, the Company, as general partner of the Operating Partnership, declared a special cash distribution on the OP Units and LTIP Units in the amount of $2.25 per unit payable on January 29, 2014 to holders of record as of the close of business on December 31, 2013. The special cash distribution was in addition to the regular quarterly distribution on the OP Units and LTIP Units of $0.65 per unit and the distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, in each case payable on January 29, 2014 to holders of record as of the close of business on December 31, 2013. Holders of the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units are not entitled to receive any special distributions. Holders of Series Two Preferred Units will participate in the special cash dividend (separately from their regular February 2014 distribution) on an as-converted basis in connection with their regular May 2014 distribution payment as provided in the Operating Partnership’s partnership agreement.

The Series Two Preferred Units may be converted into OP Units at the election of the holder thereof at any time. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit for cash equal to the then value of a share of common stock of the Company. The Company may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (not owned by the Company and including LTIP Units assuming that all conditions had been met for the conversion thereof) and Series Two Preferred Units (on an as converted basis) had all of such units been redeemed at December 31, 2013 was approximately $1.7 billion and $87.7 million, respectively, based on the closing price of the Company’s common stock of $100.37 per share on December 31, 2013.

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Noncontrolling Interest—Property Partnerships

The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $726.1 million at December 31, 2013 and approximately $(2.0) million at December 31, 2012, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

On February 7, 2013, the partner in the Company’s Transbay Tower joint venture issued a notice that it was electing under the joint venture agreement to reduce its nominal ownership interest in the venture from 50% to 5%. On February 26, 2013, the Company issued a notice to the partner electing to proceed with the venture on that basis. As a result, the Company has a 95% nominal interest in and is consolidating the joint venture. Under the joint venture agreement, if certain return thresholds are achieved the partner will be entitled to an additional promoted interest. Also, under the agreement, (1) the partner has the right to cause the Company to purchase the partner’s interest after the defined stabilization date and (2) the Company has the right to acquire the partner’s interest on the third anniversary of the stabilization date, in each case at an agreed upon purchase price or appraised value. On March 26, 2013, the consolidated joint venture completed the acquisition of a land parcel in San Francisco, California which will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The purchase price for the land was approximately $192.0 million. The joint venture has commenced construction of the initial phase of the development consisting of building the project to grade (See Note 3).

On May 31, 2013, the Company’s two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue(the General Motors Building) in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, the Company and its new joint venture partners modified the Company’s relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in the Company having sufficient financial and operating control over 767 Venture, LLC such that the Company now accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting. Upon consolidation, the Company recognized the new joint venture partners’ aggregate 40% equity interest at its aggregate fair value of approximately $480.9 million within Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets (See Notes 3 and 5).

On October 9, 2013, the Company completed the sale of a 45% ownership interest in its Times Square Tower property for a gross sale price of $684.0 million in cash. Net cash proceeds totaled approximately $673.1 million, after the payment of transaction costs. In connection with the sale, the Company formed a joint venture with the buyer and will provide customary property management and leasing services to the joint venture. Times Square Tower is an approximately 1,246,000 net rentable square foot Class A office tower located in New York City. The transaction did not qualify as a sale of real estate for financial reporting purposes because the Company continues to control the joint venture and will therefore continue to account for the entity on a consolidated basis in its financial statements. The Company has accounted for the transaction as an equity transaction and has recognized noncontrolling interest in its consolidated balance sheets totaling approximately $243.5 million, which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction. The difference between the net cash proceeds received and the noncontrolling interest recognized, which difference totals approximately $429.6 million, has not been reflected as a gain on sale of real estate in the Company’s consolidated statements of operations and has instead been reflected as an increase to Additional Paid-in Capital in the Company’s consolidated balance sheets (See Notes 3).

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12. Stockholders’ Equity

As of December 31, 2013, the Company had 152,983,101 shares of Common Stock outstanding.

As of December 31, 2013, approximately $305.3 million remained available for issuance under the Company’s $600 million “at the market” stock offering program. No shares were issued under the “at the market” stock offering program during the year ended December 31, 2013.

During the year ended December 31, 2013, the Company did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock by employees. During the year ended December 31, 2012, the Company issued 22,823 shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees.

During the years ended December 31, 2013 and 2012, the Company issued 929,441 and 1,110,660 shares of Common Stock, respectively, in connection with the redemption of an equal number of OP Units.

On January 29, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on December 31, 2012. On April 30, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on March 29, 2013. On July 31, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on June 28, 2013. On October 31, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on September 30, 2013.

On November 27, 2013, the Company’s Board of Directors declared a special cash dividend of $2.25 per share of Common Stock payable on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013. The special cash dividend was in addition to the regular quarterly dividend of $0.65 per share of Common Stock declared by the Company’s Board of Directors and payable on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013.

On March 27, 2013, the Company completed an underwritten public offering of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of its newly designated 5.25% Series B Cumulative Redeemable Preferred Stock, at a price of $2,500.00 per share ($25.00 per depositary share). The net proceeds from this offering were approximately $193.6 million, after deducting the underwriting discount and transaction expenses. The Company contributed the net proceeds to the Operating Partnership in exchange for 80,000 Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock. The Company will pay cumulative cash dividends on the Series B Preferred Stock at a rate of 5.25% per annum of the $2,500.00 liquidation preference per share. The Company may not redeem the Series B Preferred Stock prior to March 27, 2018, except in certain circumstances relating to the preservation of the Company’s REIT status. On or after March 27, 2018, the Company, at its option, may redeem the Series B Preferred Stock for a cash redemption price of $2,500.00 per share ($25.00 per depositary share), plus all accrued and unpaid dividends. The Series B Preferred Stock is not redeemable by the holders, has no maturity date and is not convertible into any other security of the Company or its affiliates.

On May 15, 2013, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On August 15, 2013, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On November 15, 2013, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On November 27, 2013, the Company’s Board of Directors declared a dividend of $32.8125 per share of Series B Preferred Stock payable on February 18, 2014 to shareholders of record as of the close of business on February 7, 2014.

During the year ended December 31, 2013, the Company issued 419,116 shares of Common Stock in connection with the exchange by holders of its Operating Partnership’s 3.75% Exchangeable Senior Notes due 2036 (See Note 8).

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13. Future Minimum Rents

The properties are leased to tenants under net operating leases with initial term expiration dates ranging from 2014 to 2048. The future contractual minimum lease payments to be received (excluding operating expense reimbursements) by the Company as of December 31, 2013, under non-cancelable operating leases which expire on various dates through 2048, are as follows:

Years Ending December 31,	(in thousands)
2014	$	1,716,754
2015		1,706,282
2016		1,660,890
2017		1,510,645
2018		1,342,157
Thereafter		6,674,466

No single tenant represented more than 10.0% of the Company’s total rental revenue for the years ended December 31, 2013, 2012 and 2011.

14. Segment Information

The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by both geographic area and property type. The Company’s segments by geographic area are Boston, New York, Princeton, San Francisco and Washington, DC. Segments by property type include: Class A Office, Office/Technical, Residential and Hotel.

Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Interest and other income, development and management services, general and administrative expenses, transaction costs, interest expense, depreciation and amortization expense, gains (losses) from investments in securities, gains (losses) from early extinguishments of debt, income from unconsolidated joint ventures, gains on consolidation of joint ventures, impairment loss, discontinued operations and noncontrolling interests are not included in Net Operating Income as internal reporting addresses these items on a corporate level.

Net Operating Income is not a measure of operating results or cash flows from operating activities as measured by accounting principles generally accepted in the United States of America, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity. All companies may not calculate Net Operating Income in the same manner. The Company considers Net Operating Income to be an appropriate supplemental measure to net income because it helps both investors and management to understand the core operations of the Company’s properties.

We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. For San Francisco these expenses, which totaled approximately $6.7 million, $6.1 million and $6.0 million for the years ended December 31, 2013, 2012 and 2011, respectively, and for Princeton these expenses were approximately $1.4 million, $1.6 million and $1.5 million for the years ended December 31, 2013, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

On May 31, 2013, the Company’s two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties (See Note 3). Effective as of May 31, 2013, the Company accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting. Upon consolidation, the operations for this building are included in the New York region.

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Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2013:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	665,991		$	662,888		$	62,678		$	214,755		$	381,359		$	1,987,671
Office/Technical		22,617			—			—			17,259			15,649			55,525
Residential		4,395			—			—			—			17,923			22,318
Hotel		40,330			—			—			—			—			40,330
Total		733,333			662,888			62,678			232,014			414,931			2,105,844
% of Grand Totals		34.82	%		31.48	%		2.98	%		11.02	%		19.70	%		100.00	%
Rental Expenses:
Class A Office		259,997			223,265			28,375			77,905			126,507			716,049
Office/Technical		6,879			—			—			3,708			4,190			14,777
Residential		1,823			—			—			—			10,307			12,130
Hotel		28,447			—			—			—			—			28,447
Total		297,146			223,265			28,375			81,613			141,004			771,403
% of Grand Totals		38.52	%		28.94	%		3.68	%		10.58	%		18.28	%		100.00	%
Net operating income	$	436,187		$	439,623		$	34,303		$	150,401		$	273,927		$	1,334,441
% of Grand Totals		32.69	%		32.94	%		2.57	%		11.27	%		20.53	%		100.00	%

For the year ended December 31, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	617,652		$	481,844		$	61,350		$	208,177		$	346,402		$	1,715,425
Office/Technical		22,460			—			—			494			16,264			39,218
Residential		3,936			—			—			—			16,632			20,568
Hotel		37,915			—			—			—			—			37,915
Total		681,963			481,844			61,350			208,671			379,298			1,813,126
% of Grand Totals		37.61	%		26.58	%		3.38	%		11.51	%		20.92	%		100.00	%
Rental Expenses:
Class A Office		242,904			160,386			27,601			75,542			111,049			617,482
Office/Technical		6,499			—			—			149			3,966			10,614
Residential		1,675			—			—			—			9,317			10,992
Hotel		28,120			—			—			—			—			28,120
Total		279,198			160,386			27,601			75,691			124,332			667,208
% of Grand Totals		41.85	%		24.04	%		4.14	%		11.34	%		18.63	%		100.00	%
Net operating income	$	402,765		$	321,458		$	33,749		$	132,980		$	254,966		$	1,145,918
% of Grand Totals		35.15	%		28.05	%		2.95	%		11.60	%		22.25	%		100.00	%

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For the year ended December 31, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	537,743		$	458,791		$	62,648		$	207,003		$	340,470		$	1,606,655
Office/Technical		25,349			—			—			—			16,236			41,585
Residential		985			—			—			—			5,632			6,617
Hotel		34,529			—			—			—			—			34,529
Total		598,606			458,791			62,648			207,003			362,338			1,689,386
% of Grand Totals		35.43	%		27.16	%		3.71	%		12.25	%		21.45	%		100.00	%
Rental Expenses:
Class A Office		206,469			152,649			28,620			72,122			95,804			555,664
Office/Technical		7,245			—			—			—			4,280			11,525
Residential		521			—			—			—			4,958			5,479
Hotel		26,128			—			—			—			—			26,128
Total		240,363			152,649			28,620			72,122			105,042			598,796
% of Grand Totals		40.14	%		25.49	%		4.78	%		12.05	%		17.54	%		100.00	%
Net operating income	$	358,243		$	306,142		$	34,028		$	134,881		$	257,296		$	1,090,590
% of Grand Totals		32.85	%		28.07	%		3.12	%		12.37	%		23.59	%		100.00	%

The following is a reconciliation of Net Operating Income to net income attributable to Boston Properties, Inc.:

	Year ended December 31,
	2013		2012			2011
Net Operating Income	$	1,334,441	$	1,145,918		$	1,090,590
Add:
Development and management services income		29,695		34,060			33,406
Income from unconsolidated joint ventures		75,074		49,078			85,896
Gains on consolidation of joint ventures		385,991		—			—
Interest and other income		8,310		10,091			5,358
Gains (losses) from investments in securities		2,911		1,389			(443	)
Gains (losses) from early extinguishments of debt		122		(4,453	)		(1,494	)
Income from discontinued operations		8,022		9,806			10,876
Gains on sales of real estate from discontinued operations		112,829		36,877			—
Gain on forgiveness of debt from discontinued operations		20,182		—			—
Less:
General and administrative expense		115,329		90,129			87,101
Transaction costs		1,744		3,653			1,987
Depreciation and amortization expense		560,637		445,875			429,742
Interest expense		446,880		410,970			391,533
Impairment loss		8,306		—			—
Impairment loss from discontinued operations		3,241		—			—
Noncontrolling interest in property partnerships		1,347		3,792			1,558
Noncontrolling interest—redeemable preferred units of the Operating Partnership		6,046		3,497			3,339
Noncontrolling interest—common units of the Operating Partnership		70,085		30,125			35,007
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		14,151		5,075			1,243
Net income attributable to Boston Properties, Inc.	$	749,811	$	289,650		$	272,679

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15. Earnings Per Share

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. by the weighted-average number of common shares outstanding during the period. The terms of the Series Two Preferred Units enable the holders to obtain OP Units of the Operating Partnership, as well as Common Stock of the Company, and as a result these are considered participating securities. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of the Company, LTIP Units, OPP Units and 2013 MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of the Company using the two-class method. Participating securities are included in the computation of diluted EPS of the Company using the if-converted method if the impact is dilutive. Because the OPP Units and 2013 MYLTIP Units require the Company to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of the Operating Partnership that are exchangeable for the Company’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.

	For the Year Ended December 31, 2013
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	618,113			152,201	$	4.06
Discontinued operations attributable to Boston Properties, Inc.		123,641			—		0.81
Allocation of undistributed earnings to participating securities		(160	)		—		—
Net income attributable to Boston Properties, Inc. common shareholders	$	741,594			152,201	$	4.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			320		(0.01	)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	741,594			152,521	$	4.86
	For the Year Ended December 31, 2012
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	248,042			150,120	$	1.65
Discontinued operations attributable to Boston Properties, Inc.		41,608			—		0.28
Net income attributable to Boston Properties, Inc. common shareholders	$	289,650			150,120	$	1.93
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			591		(0.01	)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	289,650			150,711	$	1.92

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	For the Year Ended December 31, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	263,046		145,693	$	1.80
Discontinued operations attributable to Boston Properties, Inc.		9,633		—		0.07
Net income attributable to Boston Properties, Inc. common shareholders	$	272,679		145,693	$	1.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		525		(0.01	)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	272,679		146,218	$	1.86

16. Employee Benefit Plans

Effective January 1, 1985, the predecessor of the Company adopted a 401(k) Savings Plan (the “Plan”) for its employees. Under the Plan, as amended, employees, as defined, are eligible to participate in the Plan after they have completed three months of service. Upon formation, the Company adopted the Plan and the terms of the Plan.

Effective January 1, 2000, the Company amended the Plan by increasing the Company’s matching contribution to 200% of the first 3% from 200% of the first 2% of participant’s eligible earnings contributed (utilizing earnings that are not in excess of an amount established by the IRS ($255,000, $250,000 and $245,000 in 2013, 2012 and 2011, respectively), indexed for inflation) and by eliminating the vesting requirement. The Company’s aggregate matching contribution for the years ended December 31, 2013, 2012 and 2011 was $3.4 million, $3.2 million and $3.1 million, respectively.

Effective January 1, 2001, the Company amended the Plan to provide a supplemental retirement contribution to certain employees who have at least ten years of service on January 1, 2001, and who are 40 years of age or older as of January 1, 2001. The maximum supplemental retirement contribution will not exceed the annual limit on contributions established by the IRS. The Company will record an annual supplemental retirement credit for the benefit of each participant. The Company’s supplemental retirement contribution and credit for the years ended December 31, 2013, 2012 and 2011 was $60,000, $78,000 and $62,000, respectively.

The Company also maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2013 and 2012, the Company had maintained approximately $16.6 million and $12.2 million, respectively, in a separate account, which is not restricted as to its use. The Company’s liability under the plan is equal to the total amount of compensation deferred by the plan participants and earnings on the deferred compensation pursuant to investments elected by the plan participants. The Company’s liability as of December 31, 2013 and 2012 was $16.6 million and $12.2 million, respectively, which are included in the accompanying Consolidated Balance Sheets.

17. Stock Option and Incentive Plan

At the Company’s 2012 annual meeting of stockholders held on May 15, 2012, the stockholders of the Company approved the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”). The 2012 Plan replaced the 1997 Stock Option and Incentive Plan (the “1997 Plan”). The material terms of the 2012 Plan include, among other things: (1) the maximum number of shares of common stock reserved and available for issuance under the 2012 Plan is the sum of (i) 13,000,000 newly authorized shares, plus (ii) the number of

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shares available for grant under the 1997 Stock Plan immediately prior to the effective date of the 2012 Plan, plus (iii) any shares underlying grants under the 1997 Plan that are forfeited, cancelled or terminated (other than by exercise) in the future; (2) “full-value” awards (i.e., awards other than stock options) are multiplied by a 2.32 conversion ratio to calculate the number of shares available under the 2012 Plan that are used for each full-value award, as opposed to a 1.0 conversion ratio for each stock option awarded under the 2012 Plan; (3) shares tendered or held back for taxes will not be added back to the reserved pool under the 2012 Plan; (4) stock options may not be re-priced without stockholder approval; and (5) the term of the 2012 Plan is for ten years from the date of stockholder approval.

On January 28, 2013, the Company’s Compensation Committee approved multi-year long-term incentive program (MYLTIP) awards under the Company’s 2012 Plan to officers and employees of the Company. MYLTIP awards utilize total return to shareholders (“TRS”) over a three-year measurement period, on an annualized, compounded basis, as the performance metric. Earned awards will be based on the Company’s TRS relative to (i) the Cohen & Steers Realty Majors Portfolio Index (50% weight) and (ii) the NAREIT Office Index adjusted to exclude the Company (50% weight). Earned awards will range from zero to a maximum of approximately $30.7 million depending on the Company’s TRS relative to the two indices, with four tiers (threshold: approximately $5.1 million; target: approximately $10.2 million; high: approximately $20.5 million; exceptional: approximately $30.7 million) and linear interpolation between tiers. Earned awards measured on the basis of relative TRS performance are subject to an absolute TRS component in the form of relatively simple modifiers that (A) reduce the level of earned awards in the event the Company’s annualized TRS is less than 2% and (B) cause some awards to be earned in the event the Company’s annualized TRS is more than 10% even though on a relative basis alone the Company’s TRS would not result in any earned awards.

Earned awards (if any) will vest 25% on February 4, 2016, 25% on February 4, 2017 and 50% on February 4, 2018, based on continued employment. Vesting will be accelerated in the event of a change in control, termination of employment by the Company without cause, termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to February 4, 2016, earned awards will be calculated based on TRS performance up to the date of the change of control. MYLTIP awards are in the form of LTIP Units issued on the grant date which (i) are subject to forfeiture to the extent awards are not earned and (ii) prior to the performance measurement date are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units.

On March 11, 2013, the Company announced that Owen D. Thomas would succeed Mortimer B. Zuckerman as the Company’s Chief Executive Officer, effective April 2, 2013. On April 2, 2013, the Company issued 24,231 LTIP units, 38,926 2013 MYLTIP Units and 50,847 non-qualified stock options under the 2012 Plan to Mr. Thomas, pursuant to his employment agreement. Mr. Zuckerman will continue to serve as Executive Chairman for a transition period and thereafter is expected to continue to serve as the Non-Executive Chairman of the Board. In connection with succession planning, the Company and Mr. Zuckerman entered into a Transition Benefits Agreement. If Mr. Zuckerman remains employed by the Company through July 1, 2014, he will be entitled to receive on January 1, 2015 a lump sum cash payment of $6.7 million and an equity award with a targeted value of approximately $11.1 million. The cash payment and equity award vest one-third on each of March 10, 2013, October 1, 2013 and July 1, 2014, subject to acceleration in certain circumstances. As a result, the Company recognized approximately $13.8 million of compensation expense during the year ended December 31, 2013. In addition, the agreement provides that if Mr. Zuckerman terminates his employment with the Company for any reason, voluntarily or involuntarily, he will become fully vested in any outstanding equity awards with time-based vesting. As a result, during the year ended December 31, 2013, the Company accelerated the remaining approximately $12.9 million of stock-based compensation expense associated with Mr. Zuckerman’s unvested long-term equity awards.

Under the Financial Accounting Standards Board’s Accounting Standards Codification (“ASC”) 718 “Compensation-Stock Compensation” the MYLTIP awards granted to employees in February 2013 and granted to Mr. Thomas in April 2013 have an aggregate value of approximately $9.2 million, which amount will generally be amortized into earnings over the five-year plan period under the graded vesting method.

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The Company issued 36,730, 20,756 and 19,030 shares of restricted common stock and 184,733, 174,650 and 190,067 LTIP Units to employees and non-employee directors under the 1997 Plan and 2012 Plan during the years ended December 31, 2013, 2012 and 2011. The Company issued 252,220, 186,007 and 146,844 non-qualified stock options under the 1997 Plan during the years ended December 31, 2013, 2012 and 2011. The amounts issued during 2013 include the amounts issued to Mr. Thomas pursuant to his employment agreement, as discussed above. The Company issued 400,000 2011 OPP Units to employees under the 1997 Plan during the year ended December 31, 2011. The Company issued 400,000 2012 OPP Units to employees under the 1997 Plan during the year ended December 31, 2012. The Company issued 318,926 2013 MYLTIP Units to employees under the 2012 Plan during the year ended December 31, 2013, including the amounts issued to Mr. Thomas pursuant to his employment agreement, as discussed above. Employees and directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit, OPP Unit and 2013 MYLTIP Unit. An LTIP Unit is generally the economic equivalent of a share of restricted stock in the Company. The aggregate value of the LTIP Units is included in noncontrolling interests in the Consolidated Balance Sheets. Grants of restricted stock and LTIP Units to employees vest in four equal annual installments. Restricted stock is measured at fair value on the date of grant based on the number of shares granted, as adjusted for forfeitures, and the closing price of the Company’s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. Non-qualified stock options, which are valued using the Black-Scholes option-pricing model, are recognized as an expense ratably over the corresponding employee service period. As the 2011 OPP Awards, 2012 OPP Awards and 2013 MYLTIP Awards are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2011 OPP Awards, 2012 OPP Awards and 2013 MYLTIP Awards under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in the Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, non-qualified stock options, LTIP Units, 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units was approximately $43.9 million, $28.3 million and $28.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. For the year ended December 31, 2013, stock-based compensation expense includes approximately $21.5 million consisting of the acceleration of the expense of the Company’s Executive Chairman’s stock-based compensation awards and the stock-based compensation awards associated with his transition benefits agreement related to the Company’s succession planning. For the year ended December 31, 2012, stock-based compensation expense includes approximately $2.7 million consisting of the acceleration of vesting of the Company’s Chief Operating Officer’s stock-based compensation awards associated with his resignation. Upon the conclusion of the three-year measurement period in February 2011, the 2008 OPP Awards were not earned, the program was terminated and the Company accelerated the then remaining unrecognized compensation expense totaling approximately $4.3 million during the year ended December 31, 2011. At December 31, 2013, there was $17.6 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $11.1 million of unrecognized compensation expense related to unvested 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.7 years (See Note 20).

The shares of restricted stock were valued at approximately $3.9 million ($105.30 per share weighted-average), $2.2 million ($107.31 per share weighted-average) and $1.8 million ($93.40 per share weighted-average) for the years ended December 31, 2013, 2012 and 2011, respectively.

LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of ASC 718 “Compensation—Stock Compensation” (“ASC 718”). LTIP Units issued during the years ended December 31, 2013, 2012 and 2011 were valued at approximately $17.8 million, $17.3 million and $16.5 million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2013, 2012 and 2011 was $96.13, $98.83 and $86.74, respectively. The per unit fair value of each LTIP Unit granted in 2013, 2012 and 2011 was estimated on the date of grant using the following assumptions; an expected life of 5.7 years, 5.8 years and

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5.8 years, a risk-free interest rate of 1.03%, 0.94% and 2.22% and an expected price volatility of 26.0%, 29.1% and 30.0%, respectively.

The non-qualified stock options granted during the years ended December 31, 2013, 2012 and 2011 had a weighted-average fair value on the date of grant of $18.46, $19.50 and $24.67 per option, respectively, which was computed using the Black-Scholes option-pricing model utilizing the following assumptions: an expected life of 6.0 years, 5.4 years and 6.0 years, a risk-free interest rate of 1.11%, 0.92% and 2.37%, an expected price volatility of 26.0%, 28.4% and 35.0% and an expected dividend yield of 3.0%, 2.9% and 3.0%, respectively. The exercise price of the options granted during the years ended December 31, 2013, 2012 and 2011 where $105.10, $107.23 and $92.71, respectively, which was the closing price of the Company’s common stock on the date of grant.

A summary of the status of the Company’s stock options as of December 31, 2013, 2012 and 2011 and changes during the years then ended are presented below:

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2010		324,938		$	32.65
Granted		146,844		$	92.71
Exercised		(316,159	)	$	32.63
Canceled		—		$	—
Outstanding at December 31, 2011		155,623		$	89.35
Granted		186,007		$	107.23
Exercised		(22,823	)	$	72.42
Canceled		(24,280	)	$	100.15
Outstanding at December 31, 2012		294,527		$	101.06
Granted		252,220		$	104.50
Exercised		—		$	—
Canceled		—		$	—
Special dividend adjustment		12,076		$	100.44
Outstanding at December 31, 2013		558,823		$	100.43

The following table summarizes information about stock options outstanding at December 31, 2013:

Options Outstanding							Options Exercisable
Exercise Prices	Number Outstanding  at 12/31/13		Remaining Contractual  Life		Exercise Price		Number Exercisable at 12/31/13		Exercise Price
$90.71		131,837		7.1 years	$	90.71		80,240	$	90.71
$99.94		51,971		9.3 years	$	99.94		—	$	—
$102.83		205,821		9.1 years	$	102.83		48,026	$	102.83
$105.25		169,194		8.1 years	$	105.25		71,602	$	105.25

The total intrinsic value of the outstanding and exercisable stock options as of December 31, 2013 was approximately $0.8 million. In addition, the Company had 91,496 and 13,633 options exercisable at a weighted-average exercise price of $98.92 and $54.32 at December 31, 2012 and 2011, respectively.

The Company adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the “Stock Purchase Plan”) to encourage the ownership of Common Stock by eligible employees. The Stock Purchase Plan became effective on January 1, 1999 with an aggregate maximum of 250,000 shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to purchase on the business day immediately following the end of the biannual purchase periods (i.e., January 1-June 30 and July 1-December 31) shares of Common Stock at a purchase price equal to 85% of the average closing prices of the Common Stock during the last ten business days of the purchase period. The Company issued 6,442, 7,406 and 6,356 shares with the weighted average

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purchase price equal to $89.65 per share, $86.52 per share and $80.13 per share under the Stock Purchase Plan during the years ended December 31, 2013, 2012 and 2011, respectively.

18. Related Party Transactions

Prior to joining the Company effective January 2, 2014, Mr. John F. Powers provided commercial real estate brokerage services to the Company, on behalf of his prior employer, CBRE, in connection with certain leasing transactions. Mr. Powers received approximately $592,000 during the year ended December 31, 2013 in connection with these transactions. Mr. John F. Powers is a Senior Vice President of Boston Properties, Inc. and the Regional Manager of its New York office.

A firm controlled by Mr. Raymond A. Ritchey’s brother was paid aggregate leasing commissions of approximately $868,000, $1,306,000 and $671,000 for the years ended December 31, 2013, 2012 and 2011, respectively, related to certain exclusive leasing arrangements for certain Northern Virginia properties. Mr. Ritchey is an Executive Vice President of Boston Properties, Inc.

On June 30, 1998, the Company acquired from entities controlled by Mr. Alan B. Landis, a former director, a portfolio of properties known as the Carnegie Center Portfolio and Tower Center One and related operations and development rights (collectively, the “Carnegie Center Portfolio”). In connection with the acquisition of the Carnegie Center Portfolio, the Operating Partnership entered into a development agreement (the “Development Agreement”) with affiliates of Mr. Landis providing for up to approximately 2,000,000 square feet of development in or adjacent to the Carnegie Center office complex. An affiliate of Mr. Landis was entitled to a purchase price for each parcel developed under the Development Agreement calculated on the basis of $20 per rentable square foot of property developed. Another affiliate of Mr. Landis was eligible to earn a contingent payment for each developed property that achieves a stabilized return in excess of a target annual return ranging between 10.5% and 11%. The Development Agreement also provided that upon negotiated terms and conditions, the Company and Mr. Landis would form a development company to provide development services for these development projects and would share the expenses and profits, if any, of this new company. In addition, in connection with the acquisition of the Carnegie Center Portfolio, Mr. Landis became a director of the Company pursuant to an Agreement Regarding Directorship, dated as of June 30, 1998, with the Company (the “Directorship Agreement”). Under the Directorship Agreement, the Company agreed to nominate Mr. Landis for re-election as a director at each annual meeting of stockholders of the Company in a year in which his term expires, provided that specified conditions are met.

On October 21, 2004, the Company entered into an agreement (the “2004 Agreement”) to modify several provisions of the Development Agreement. Under the terms of the 2004 Agreement, the Operating Partnership and affiliates of Mr. Landis amended the Development Agreement to limit the rights of Mr. Landis and his affiliates to participate in the development of properties under the Development Agreement. Among other things, Mr. Landis agreed that (1) Mr. Landis and his affiliates will have no right to participate in any entity formed to acquire land parcels or the development company formed by the Operating Partnership to provide development services under the Development Agreement, (2) Mr. Landis will have no right or obligation to play a role in development activities engaged in by the development company formed by the Operating Partnership under the Development Agreement or receive compensation from the development company and (3) the affiliate of Mr. Landis will have no right to receive a contingent payment for developed properties based on stabilized returns. In exchange, the Company (together with the Operating Partnership) agreed to:

• effective as of June 30, 1998, pay Mr. Landis $125,000 on January 1 of each year until the earlier of (A) January 1, 2018, (B) the termination of the Development Agreement or (C) the date on which all development properties under the Development Agreement have been conveyed pursuant to the Development Agreement, with $750,000, representing payments of this annual amount from 1998 to 2004, being paid upon execution of the 2004 Agreement; and

• pay an affiliate of Mr. Landis, in connection with the development of land parcels acquired under the Development Agreement, an aggregate fixed amount of $10.50 per rentable square foot of property developed (with a portion of this amount (i.e., $5.50) being subject to adjustment, in specified circumstances, based on future increases in the Consumer Price Index) in lieu of a contingent payment

163

based on stabilized returns, which payment could have been greater or less than $10.50 per rentable square foot of property developed.

The Operating Partnership also continues to be obligated to pay an affiliate of Mr. Landis the purchase price of $20 per rentable square foot of property developed for each land parcel acquired as provided in the original Development Agreement. During the 20-year term of the Development Agreement, until such time, if any, as the Operating Partnership elects to acquire a land parcel, an affiliate of Mr. Landis will remain responsible for all carrying costs associated with such land parcel. On July 24, 2007, the Company acquired from Mr. Landis 701 Carnegie Center, a land parcel located in Princeton, New Jersey for a purchase price of approximately $3.1 million.

In addition, in connection with entering into the 2004 Agreement, Mr. Landis resigned as a director of the Company effective as of May 11, 2005 and agreed that the Company had no future obligation to nominate Mr. Landis as a director of the Company under the Directorship Agreement or otherwise. Mr. Landis did not resign because of a disagreement with the Company on any matter relating to its operations, policies or practices. Mitchell S. Landis, the Senior Vice President and Regional Manager of the Company’s Princeton, New Jersey region, is the brother of Alan B. Landis.

In accordance with the Company’s 2012 Plan, and as approved by the Board of Directors, six non-employee directors made an election to receive deferred stock units in lieu of cash fees for 2013. The deferred stock units will be settled in shares of common stock upon the cessation of such director’s service on the Board of Directors. As a result of these elections, the aggregate cash fees otherwise payable to a non-employee director during a fiscal quarter are converted into a number of deferred stock units equal to the aggregate cash fees divided by the last reported sales price of a share of the Company’s common stock on the last trading of the applicable fiscal quarter. The deferred stock units are also credited with dividend equivalents as dividends are paid by the Company. At December 31, 2013 and 2012, the Company had outstanding 83,995 and 76,682 deferred stock units, respectively.

19. Selected Interim Financial Information (unaudited)

The tables below reflect the Company’s selected quarterly information for the years ended December 31, 2013 and 2012. Total revenue and income from continuing operations amounts have been reclassified for properties qualifying for discontinued operations presentation (See Note 3).

	2013 Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	(in thousands, except for per share amounts)
Total revenue	$	477,826	$	510,033	$	571,481	$	576,199
Income from continuing operations	$	38,496	$	503,446	$	82,311	$	79,395
Net income attributable to Boston Properties, Inc.	$	47,854	$	452,417	$	152,677	$	88,719
Income attributable to Boston Properties, Inc. per share—basic	$	0.32	$	2.95	$	1.00	$	0.58
Income attributable to Boston Properties, Inc. per share—diluted	$	0.31	$	2.94	$	1.00	$	0.58

	2012 Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	(in thousands, except for per share amounts)
Total revenue	$	438,722	$	466,197	$	464,220	$	478,047
Income from continuing operations	$	53,079	$	94,795	$	63,331	$	74,251
Net income attributable to Boston Properties, Inc.	$	48,454	$	118,559	$	57,249	$	65,400
Income attributable to Boston Properties, Inc. per share—basic	$	0.33	$	0.79	$	0.38	$	0.43
Income attributable to Boston Properties, Inc. per share—diluted	$	0.33	$	0.78	$	0.38	$	0.43

164

20. Subsequent Events

On January 27, 2014, the Company’s Compensation Committee approved the 2014 multi-year, long-term incentive program (the “2014 MYLTIP”) awards under the Company’s 2012 Plan to certain officers and employees of the Company. The 2014 MYLTIP awards utilize TRS over a three-year measurement period, on an annualized, compounded basis, as the performance metric. Earned awards will be based on the Company’s TRS relative to (i) the Cohen & Steers Realty Majors Portfolio Index (50% weight) and (ii) the NAREIT Office Index adjusted to exclude the Company (50% weight). Earned awards will range from zero to a maximum of approximately $40.2 million depending on the Company’s TRS relative to the two indices, with four tiers (threshold: approximately $6.7 million; target: approximately $13.4 million; high: approximately $26.8 million; exceptional: approximately $40.2 million) and linear interpolation between tiers. Earned awards measured on the basis of relative TRS performance are subject to an absolute TRS component in the form of relatively simple modifiers that (A) reduce the level of earned awards in the event the Company’s annualized TRS is less than 0% and (B) cause some awards to be earned in the event the Company’s annualized TRS is more than 12% even though on a relative basis alone the Company’s TRS would not result in any earned awards.

Earned awards (if any) will vest 50% on February 3, 2017 and 50% on February 3, 2018, based on continued employment. Vesting will be accelerated in the event of a change in control, termination of employment by the Company without cause, termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to February 3, 2017, earned awards will be calculated based on TRS performance up to the date of the change of control. The 2014 MYLTIP awards are in the form of LTIP Units issued on the grant date which (i) are subject to forfeiture to the extent awards are not earned and (ii) prior to the performance measurement date are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units.

Under the Financial Accounting Standards Board’s Accounting Standards Codification (“ASC”) 718 “Compensation-Stock Compensation” the 2014 MYLTIP awards have an aggregate value of approximately $13.1 million, which amount will generally be amortized into earnings over the four-year plan period under the graded vesting method.

On January 31, 2014, the Company issued 21,455 shares of restricted common stock and 109,718 LTIP units under the 2012 Plan to certain employees of the Company.

On January 31, 2014, the measurement period for the Company’s 2011 OPP Awards expired and the Company’s TRS performance was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Awards. As a result, the Company accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million. Accordingly, all 2011 OPP Awards were automatically forfeited and the Operating Partnership repaid employees an amount equal to $0.25 (which is equal to what they paid upon acceptance of the award) multiplied by the number of 2011 OPP Awards they received.

On February 10, 2014, the Company completed and fully placed in-service The Avant at Reston Town Center development project comprised of 359 apartment units and retail space aggregating approximately 355,000 square feet located in Reston, Virginia.

On February 18, 2014, the Company’s Operating Partnership repaid at maturity the $747.5 million aggregate principal amount outstanding of its 3.625% Exchangeable Senior Notes due 2014 plus accrued and unpaid interest thereon.

165

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosures

None.

Item 9A. Controls and Procedures

As of the end of the period covered by this report, an evaluation was carried out by our management, with the participation of our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures were effective as of the end of the period covered by this report. In addition, no change in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) occurred during the fourth quarter of our fiscal year ended December 31, 2013 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Management’s Report on Internal Control over Financial Reporting is set forth on page 113 of this Annual Report on Form 10-K and is incorporated herein by reference.

Item 9B. Other Information

None.

166

PART III

Item 10. Directors, Executive Officers and Corporate Governance

The information required by Item 10 will be included in the Proxy Statement to be filed relating to our 2014 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 11. Executive Compensation

The information required by Item 11 will be included in the Proxy Statement to be filed relating to our 2014 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The following table summarizes our equity compensation plans as of December 31, 2013.

Equity Compensation Plan Information

Plan category	Number of securities to be issued upon exercise of outstanding options, warrants and rights			Weighted-average exercise price of outstanding options, warrants and rights			Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
	(a)			(b)			(c)
Equity compensation plans approved by security holders(1)		3,221,915	(2)	$	100.43	(2)		12,628,358	(3)
Equity compensation plans not approved by security holders(4)		N/A			N/A			122,652
Total		3,221,915		$	100.43			12,751,010

(1) Includes information related to our 2012 Plan.

(2) Includes (a) 558,823 shares of common stock issuable upon the exercise of outstanding options (199,868 of which are vested and exercisable), (b) 1,455,761 long term incentive units (LTIP units) (1,087,403 of which are vested) that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to the Operating Partnership for redemption and acquired by us for shares of our common stock, (c) 14,362 common units issued upon conversion of LTIP units, which may be presented to the Operating Partnership for redemption and acquired by us for shares of our common stock, (d) 396,500 2011 OPP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to the Operating Partnership for redemption and acquired by us for shares of our common stock, (e) 396,150 2012 OPP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to the Operating Partnership for redemption and acquired by us for shares of our common stock, (f) 316,325 2013 MYLTIP Awards that, upon the satisfaction of certain conditions, are convertible into common units, which may be presented to the Operating Partnership for redemption and acquired by us for shares of our common stock (g) 83,994 deferred stock units which were granted pursuant to elections by certain of our non-employee directors to defer all cash compensation to be paid to such directors and to receive their deferred cash compensation in shares of our common stock upon their retirement from our Board of Directors. Does not include 63,638 shares of restricted stock, as they have been reflected in our total shares outstanding. Because there is no exercise price associated with LTIP units, 2011 OPP Awards, 2012 OPP Awards, 2013 MYLTIP Awards or deferred stock units, such shares are not included in the weighed-average exercise price calculation.

167

(3) “Full-value” awards (i.e., awards other than stock options) are multiplied by a 2.32 conversion ratio to calculate the number of shares available under the 2012 Plan that are used for each full-value award, as opposed to a 1.0 conversion ratio for each stock option awarded under the 2012 Plan.

(4) Includes information related to the 1999 Non-Qualified Employee Stock Purchase Plan (ESPP). The ESPP was adopted by the Board of Directors on October 29, 1998. The ESPP has not been approved by our stockholders. The ESPP is available to all our employees that are employed on the first day of the purchase period. Under the ESPP, each eligible employee may purchase shares of our common stock at semi-annual intervals each year at a purchase price equal to 85% of the average closing prices of our common stock on the New York Stock Exchange during the last ten business days of the purchase period. Each eligible employee may contribute no more than $10,000 per year to purchase our common stock under the ESPP.

Additional information concerning security ownership of certain beneficial owners and management required by Item 12 will be included in the Proxy Statement to be filed relating to our 2014 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by Item 13 will be included in the Proxy Statement to be filed relating to our 2014 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services

The information required by Item 14 will be included in the Proxy Statement to be filed relating to our 2014 Annual Meeting of Stockholders and is incorporated herein by reference.

168

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) Financial Statement Schedule

Boston Properties, Inc.

Schedule 3 - Real Estate and Accumulated Depreciation

December 31, 2013

(dollars in thousands) 

Property Name	Type		Location		Encumbrances		Original				Costs Capitalized Subsequent to Acquisition			Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated		Depreciable Lives  (Years)
							Land		Building
767 Fifth Avenue (The General Motors Building)		Office		New York, NY	$	1,463,143	$	1,796,252	$	1,532,654	$	4,481		$	1,796,252	$	1,537,135	$	—	$	—	$	3,333,387	$	28,901		1968	(1)
Embarcadero Center		Office		San Francisco, CA		360,133		179,697		847,410		314,292			195,985		1,145,414		—		—		1,341,399		472,324		1970/1989	(1)
Prudential Center		Office		Boston, MA		—		92,077		734,594		354,501			107,426		1,057,815		15,931		—		1,181,172		398,909		1965/1993/2002	(1)
399 Park Avenue		Office		New York, NY		—		339,200		700,358		107,604			354,107		793,055		—		—		1,147,162		219,938		1961	(1)
601 Lexington Avenue		Office		New York, NY		722,253		241,600		494,782		217,155			289,639		663,898		—		—		953,537		205,721		1977/1997	(1)
The John Hancock Tower and Garage		Office		Boston, MA		652,933		219,543		667,884		57,420			219,616		724,812		419		—		944,847		78,366		1976	(1)
Times Square Tower		Office		New York, NY		—		165,413		380,438		85,146			169,193		461,804		—		—		630,997		137,934		2004	(1)
100 Federal Street		Office		Boston, MA		—		131,067		435,954		6,020			131,067		441,760		214		—		573,041		29,060		1971-1975	(1)
Carnegie Center		Office		Princeton, NJ		—		105,107		377,259		66,866			103,064		443,817		2,206		145		549,232		169,587		1983-1999	(1)
Atlantic Wharf		Office		Boston, MA		—		63,988		454,537		11,644			63,988		466,181		—		—		530,169		39,697		2011	(1)
Fountain Square		Office		Reston, VA		226,604		56,853		306,298		3,877			56,853		310,175		—		—		367,028		15,460		1986-1990	(1)
510 Madison Avenue		Office		New York, NY		—		103,000		253,665		6,309			103,000		259,974		—		—		362,974		15,901		2012	(1)
599 Lexington Avenue		Office		New York, NY		750,000		81,040		100,507		123,179			87,852		216,874		—		—		304,726		144,094		1986	(1)
South of Market and Democracy Tower		Office		Reston, VA		—		13,603		237,479		9,790			13,687		247,185		—		—		260,872		50,831		2008-2009	(1)
Gateway Center		Office		San Francisco, CA		—		28,255		139,245		51,330			30,627		188,203		—		—		218,830		80,461		1984/1986/2002	(1)
Bay Colony Corporate Center		Office		Waltham, MA		—		18,789		148,451		47,332			18,789		195,783		—		—		214,572		21,339		1985-1989	(1)
2200 Pennsylvania Avenue		Office		Washington, DC		—		—		183,541		3,767			—		187,308		—		—		187,308		18,185		2011	(1)
Mountain View Research Park		Office		Mountain View, CA		—		106,162		76,137		2,196			106,162		78,333		—		—		184,495		3,013		1977-1981/2007-2013	(1)
One and Two Patriots Park		Office		Reston, VA		—		18,429		126,315		34,994			22,352		157,386		—		—		179,738		7,032		1987/1988/2012/2013	(1)
3200 Zanker Road		Office		San Jose, CA		—		36,705		82,863		24,669			36,997		103,496		3,744		—		144,237		23,165		1988	(1)
Reservoir Place		Office		Waltham, MA		—		18,605		92,619		27,446			20,118		118,552		—		—		138,670		52,829		1955/1987	(1)
1333 New Hampshire Avenue		Office		Washington, DC		—		34,032		85,660		9,061			35,394		93,359		—		—		128,753		30,392		1996	(1)
505 9th Street		Office		Washington, DC		121,360		38,885		83,719		5,692			42,082		86,214		—		—		128,296		20,358		2007	(1)
Kingstowne Towne Center		Office		Alexandria, VA		33,338		18,021		109,038		742			18,062		109,739		—		—		127,801		26,526		2003-2006	(1)
1330 Connecticut Avenue		Office		Washington, DC		—		25,982		82,311		16,286			27,135		97,444		—		—		124,579		29,518		1984	(1)
Capital Gallery		Office		Washington, DC		—		4,725		29,565		86,993			8,662		112,621		—		—		121,283		50,217		1981/2006	(1)
Weston Corporate Center		Office		Weston, MA		—		25,753		92,312		(123	)		25,854		92,088		—		—		117,942		10,921		2010	(1)
One Freedom Square		Office		Reston, VA		—		9,929		84,504		16,666			11,293		99,806		—		—		111,099		32,827		2000	(1)
One and Two Reston Overlook		Office		Reston, VA		—		16,456		66,192		26,635			17,561		91,722		—		—		109,283		31,144		1999	(1)
Two Freedom Square		Office		Reston, VA		—		13,930		77,739		13,816			15,420		90,065		—		—		105,485		37,294		2001	(1)
Seven Cambridge Center		Office		Cambridge, MA		—		3,457		97,136		2,880			4,125		99,348		—		—		103,473		47,498		2006	(1)
Five Cambridge Center		Office		Cambridge, MA		—		18,863		53,346		29,762			21,173		80,798		—		—		101,971		19,158		1981/1996	(1)
140 Kendrick Street		Office		Needham, MA		—		18,095		66,905		14,759			19,092		80,667		—		—		99,759		17,433		2000	(1)
Discovery Square		Office		Reston, VA		—		11,198		71,782		16,189			12,533		86,636		—		—		99,169		28,865		2001	(1)
Four Cambridge Center		Office		Cambridge, MA		—		19,104		52,078		11,872			20,785		62,269		—		—		83,054		10,761		1983/1998	(1)
Waltham Weston Corporate Center		Office		Waltham, MA		—		10,385		60,694		8,462			11,097		68,444		—		—		79,541		21,709		2003	(1)
77 CityPoint		Office		Waltham, MA		—		13,847		60,383		3,160			13,873		63,517		—		—		77,390		12,301		2008	(1)
230 CityPoint		Office		Waltham, MA		—		13,189		49,823		13,102			13,593		62,521		—		—		76,114		17,601		1992	(1)
North First Business Park		Office		San Jose, CA		—		58,402		13,069		4,010			23,377		16,215		35,889		—		75,481		10,208		1981	(1)
Seventeen Cambridge Center		Office		Cambridge, MA		—		18,080		51,262		—			18,080		51,262		—		—		69,342		1,080		2013	(1)
2440 West El Camino Real		Office		Mountain View, CA		—		16,741		51,285		502			16,741		51,787		—		—		68,528		4,390		1987/2003	(1)
Wisconsin Place		Office		Chevy Chase, MD		—		—		53,349		12,787			—		66,136		—		—		66,136		11,573		2009	(1)
Reston Corporate Center		Office		Reston, VA		—		9,135		50,857		5,346			10,148		55,190		—		—		65,338		21,034		1984	(1)
New Dominion Technology Park, Bldg. Two		Office		Herndon, VA		63,000		5,584		51,868		3,894			6,510		54,836		—		—		61,346		16,557		2004	(1)

169

Boston Properties, Inc.

Schedule 3 - Real Estate and Accumulated Depreciation

December 31, 2013

(dollars in thousands)

Property Name	Type		Location		Encumbrances		Original				Costs Capitalized Subsequent to Acquisition			Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated		Depreciable Lives  (Years)
							Land		Building
Sumner Square		Office		Washington, DC		—		624		28,745		23,679			1,478		51,570		—		—		53,048		23,282		1985	(1)
New Dominion Technology Park, Bldg. One		Office		Herndon, VA		43,278		3,880		43,227		3,882			4,583		46,406		—		—		50,989		19,584		2001	(1)
200 West Street		Office		Waltham, MA		—		16,148		24,983		8,568			16,813		32,886		—		—		49,699		14,834		1999	(1)
191 Spring Street		Office		Lexington, MA		—		2,850		27,166		18,558			3,151		45,423		—		—		48,574		29,636		1971/1995	(1)
One Cambridge Center		Office		Cambridge, MA		—		134		25,110		20,608			548		45,304		—		—		45,852		24,914		1987	(1)
University Place		Office		Cambridge, MA		13,692		—		37,091		6,785			390		43,486		—		—		43,876		20,692		1985	(1)
2600 Tower Oaks Boulevard		Office		Rockville, MD		—		4,243		31,125		8,257			4,785		38,840		—		—		43,625		16,576		2001	(1)
Quorum Office Park		Office		Chelmsford, MA		—		3,750		32,454		5,672			5,187		36,689		—		—		41,876		12,748		2001	(1)
Three Patriots Park		Office		Reston, VA		—		3,594		32,977		3,013			4,009		35,575		—		—		39,584		12,465		2006	(1)
500 E Street		Office		Washington, DC		—		109		22,420		12,854			2,379		33,004		—		—		35,383		20,633		1987	(1)
Eight Cambridge Center		Office		Cambridge, MA		—		850		25,042		8,507			1,323		33,076		—		—		34,399		11,139		1999	(1)
Mountain View Technology Park		Office		Mountain View, CA		—		20,359		13,640		182			20,359		13,822		—		—		34,181		761		1972	(1)
Three Cambridge Center		Office		Cambridge, MA		—		174		12,200		8,758			965		20,167		—		—		21,132		9,768		1987	(1)
Ten Cambridge Center		Office		Cambridge, MA		—		1,299		12,943		6,117			2,395		17,964		—		—		20,359		11,337		1990	(1)
201 Spring Street		Office		Lexington, MA		—		2,849		15,303		(154	)		3,124		14,874		—		—		17,998		6,034		1997	(1)
40 Shattuck Road		Office		Andover, MA		—		709		14,740		2,453			893		17,009		—		—		17,902		5,547		2001	(1)
Lexington Office Park		Office		Lexington, MA		—		998		1,426		13,762			1,264		14,922		—		—		16,186		10,566		1982	(1)
92-100 Hayden Avenue		Office		Lexington, MA		—		594		6,748		7,819			802		14,359		—		—		15,161		9,914		1985	(1)
33 Hayden Avenue		Office		Lexington, MA		—		266		3,234		10,283			425		13,358		—		—		13,783		7,486		1979	(1)
181 Spring Street		Office		Lexington, MA		—		1,066		9,520		1,950			1,160		11,376		—		—		12,536		4,007		1999	(1)
195 West Street		Office		Waltham, MA		—		1,611		6,652		4,175			1,858		10,580		—		—		12,438		6,187		1990	(1)
91 Hartwell Avenue		Office		Lexington, MA		—		784		6,464		4,984			941		11,291		—		—		12,232		7,535		1985	(1)
Eleven Cambridge Center		Office		Cambridge, MA		—		121		5,535		5,131			324		10,463		—		—		10,787		7,240		1984	(1)
7501 Boston Boulevard, Building Seven		Office		Springfield, VA		—		665		9,273		544			791		9,691		—		—		10,482		3,895		1997	(1)
7435 Boston Boulevard, Building One		Office		Springfield, VA		—		392		3,822		3,895			659		7,450		—		—		8,109		5,526		1982	(1)
7450 Boston Boulevard, Building Three		Office		Springfield, VA		—		1,165		4,681		1,915			1,430		6,331		—		—		7,761		2,917		1987	(1)
8000 Grainger Court, Building Five		Office		Springfield, VA		—		366		4,282		2,944			601		6,991		—		—		7,592		5,160		1984	(1)
453 Ravendale Drive		Office		Mountain View, CA		—		5,477		1,090		230			5,477		1,320		—		—		6,797		142		1977	(1)
7500 Boston Boulevard, Building Six		Office		Springfield, VA		—		138		3,749		2,590			406		6,071		—		—		6,477		4,133		1985	(1)
7601 Boston Boulevard, Building Eight		Office		Springfield, VA		—		200		878		4,875			551		5,402		—		—		5,953		3,576		1986	(1)
Fourteen Cambridge Center		Office		Cambridge, MA		—		110		4,483		1,223			273		5,543		—		—		5,816		3,805		1983	(1)
7300 Boston Boulevard, Building Thirteen		Office		Springfield, VA		—		608		4,773		230			661		4,950		—		—		5,611		3,934		2002	(1)
8000 Corporate Court, Building Eleven		Office		Springfield, VA		—		136		3,071		1,484			775		3,916		—		—		4,691		2,355		1989	(1)
7374 Boston Boulevard, Building Four		Office		Springfield, VA		—		241		1,605		1,902			398		3,350		—		—		3,748		2,327		1984	(1)
7375 Boston Boulevard, Building Ten		Office		Springfield, VA		—		23		2,685		1,007			93		3,622		—		—		3,715		2,261		1988	(1)
7451 Boston Boulevard, Building Two		Office		Springfield, VA		—		249		1,542		1,313			613		2,491		—		—		3,104		2,131		1982	(1)
32 Hartwell Avenue		Office		Lexington, MA		—		168		1,943		800			314		2,597		—		—		2,911		1,568		1968-1979/1987	(1)
164 Lexington Road		Office		Billerica, MA		—		592		1,370		319			643		1,638		—		—		2,281		703		1982	(1)
17 Hartwell Avenue		Office		Lexington, MA		—		26		150		1,002			65		1,113		—		—		1,178		639		1968	(1)
Residences on The Avenue, 2221 I St., NW		Residential		Washington, DC		—		—		119,874		(32	)		—		119,842		—		—		119,842		7,948		2011	(1)
The Lofts at Atlantic Wharf		Residential		Boston, MA		—		3,529		54,891		1,543			3,529		56,434		—		—		59,963		3,591		2011	(1)
Cambridge Center Marriott		Hotel		Cambridge, MA		—		478		37,918		35,981			1,201		73,176		—		—		74,377		47,182		1986	(1)
Cambridge Center East Garage		Garage		Cambridge, MA		—		—		35,035		1,487			103		36,419		—		—		36,522		6,684		1984	(1)
Cambridge Center West Garage		Garage		Cambridge, MA		—		1,256		15,697		1,553			1,434		17,072		—		—		18,506		3,364		2006	(1)
Cambridge Center North Garage		Garage		Cambridge, MA		—		1,163		11,633		1,085			1,163		12,718		—		—		13,881		8,157		1990	(1)

170

Boston Properties, Inc.

Schedule 3 - Real Estate and Accumulated Depreciation

December 31, 2013

(dollars in thousands)

Property Name	Type		Location		Encumbrances			Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated		Depreciable Lives  (Years)
								Land		Building
250 West 55th Street		Development		New York, NY		—			—		—		818,243		16,305		45,476		—		756,462		818,243		483		N/A	N/A
Transbay Tower		Development		San Francisco, CA		—			—		—		255,406		—		—		—		255,406		255,406		—		N/A	N/A
680 Folsom Street		Development		San Francisco, CA		—			—		—		241,093		—		—		3,475		237,618		241,093		—		N/A	N/A
601 Massachusetts Avenue		Development		Washington, DC		—			—		—		121,694		—		—		—		121,694		121,694		—		N/A	N/A
535 Mission Street		Development		San Francisco, CA		—			—		—		113,274		—		—		—		113,274		113,274		—		N/A	N/A
The Avant at Reston Town Center Residential		Development		Reston, VA		—			—		—		107,022		12,741		55,701		—		38,580		107,022		160		N/A	N/A
Springfield Metro Center		Land		Springfield, VA		—			—		—		32,073		—		—		32,073		—		32,073		—		N/A	N/A
Plaza at Almaden		Land		San Jose, CA		—			—		—		29,003		—		—		29,003		—		29,003		—		N/A	N/A
Tower Oaks Master Plan		Land		Rockville, MD		—			—		—		28,976		—		—		28,976		—		28,976		—		N/A	N/A
Reston Signature Site		Land		Reston, VA		—			—		—		27,890		—		—		27,890		—		27,890		—		N/A	N/A
Prospect Hill		Land		Waltham, MA		—			—		—		24,197		—		667		23,530		—		24,197		—		N/A	N/A
Washingtonian North		Land		Gaithersburg, MD		—			—		—		18,290		—		—		18,290		—		18,290		—		N/A	N/A
6601 & 6605 Springfield Center Drive		Land		Springfield, VA		—			—		—		13,866		—		—		13,866		—		13,866		—		N/A	N/A
Waltham Office Center		Land		Waltham, MA		—			—		—		12,716		165		8,445		4,106		—		12,716		8,063		N/A	N/A
103 4th Avenue		Land		Waltham, MA		—			—		—		11,918		—		—		11,918		—		11,918		—		N/A	N/A
Cambridge Master Plan		Land		Cambridge, MA		—			—		—		11,153		—		—		11,153		—		11,153		—		N/A	N/A
Reston Gateway		Land		Reston, VA		—			—		—		9,682		—		—		9,682		—		9,682		—		N/A	N/A
Reston Eastgate		Land		Reston, VA		—			—		—		8,807		—		—		8,807		—		8,807		—		N/A	N/A
Crane Meadow		Land		Marlborough, MA		—			—		—		8,725		—		—		8,725		—		8,725		—		N/A	N/A
Broad Run Business Park		Land		Loudon County, VA		—			—		—		7,888		1,621		—		6,267		—		7,888		—		N/A	N/A
30 Shattuck Road		Land		Andover, MA		—			—		—		1,212		—		—		1,212		—		1,212		—		N/A	N/A
					$	4,449,734	(2)	$	4,303,172	$	10,631,057	$	4,019,372	$	4,450,532	$	12,682,514	$	297,376	$	1,523,179	$	18,953,601	$	3,145,701

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $25,164. Accumulated Depreciation does not include approximately $15,870 of accumulated depreciation related to Furniture, Fixtures and Equipment.

The aggregate cost and accumulated depreciation for tax purposes was approximately $14.8 billion and $2.6 billion, respectively.

(1) Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2) Includes the unamortized balance of the historical fair value adjustment totaling approximately $191.2 million.

171

Boston Properties, Inc.

Real Estate and Accumulated Depreciation

December 31, 2013

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2013			2012			2011
Real Estate:
Balance at the beginning of the year	$	14,869,887		$	13,363,113		$	12,740,892
Additions to/improvements of real estate		4,410,622			1,602,583			668,084
Assets sold/written-off		(326,908	)		(95,809	)		(45,863	)
Balance at the end of the year	$	18,953,601		$	14,869,887		$	13,363,113
Accumulated Depreciation:
Balance at the beginning of the year	$	2,919,479		$	2,626,324		$	2,308,665
Depreciation expense		419,908			367,625			362,636
Assets sold/written-off		(193,686	)		(74,470	)		(44,977	)
Balance at the end of the year	$	3,145,701		$	2,919,479		$	2,626,324

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

172

(b) Exhibits

2.1	—	Transfer Agreement, dated May 31, 2013, by and among BP 767 Fifth LLC, Sungate Fifth Avenue LLC, 767 LLC and BP/DC 767 Fifth LLC (incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on June 3, 2013.)
3.1	—	Form of Amended and Restated Certificate of Incorporation of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Registration Statement on Form S-11, File No. 333-25279.)
3.2	—	Amended and Restated Certificate of Designations of Series E Junior Participating Cumulative Preferred Stock of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on June 18, 2007.)
3.3	—	Certificate of Amendment of Amended and Restated Certificate of Incorporation of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on May 20, 2010.)
3.4	—	Certificate of Designations of 92,000 shares of 5.25% Series B Cumulative Redeemable Preferred Stock of Boston Properties, Inc. (incorporated by reference to Exhibit 3.3 to the Registration Statement on Form 8-A of Boston Properties, Inc. filed on March 22, 2013.)
3.5	—	Second Amended and Restated Bylaws of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on October 24, 2008.)
3.6	—	Amendment to Second Amended and Restated By-laws of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.2 to Boston Properties, Inc.’s Current Report on Form 8-K filed on May 20, 2010.)
3.7	—	Form of Certificate of Designations for Series A Preferred Stock. (Incorporated by reference to Exhibit 99.26 to Boston Properties, Inc.’s Current Report on Form 8-K filed on November 25, 1998.)
4.1	—	Shareholder Rights Agreement, dated as of June 18, 2007, between Boston Properties, Inc. and Computershare Trust Company, N.A., as Rights Agent. (Incorporated by reference to Exhibit 4.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on June 18, 2007.)
4.2	—	Form of Common Stock Certificate. (Incorporated by reference to Exhibit 4.3 to Boston Properties, Inc.’s Registration Statement on Form S-11, File No. 333-25279.)
4.3	—	Master Deposit Agreement among Boston Properties, Inc., Computershare Inc. and Computershare Trust Company, N.A., collectively, as depositary, and the holders from time to time of depositary shares as described therein, dated March 22, 2013 (incorporated by reference to Exhibit 4.1 to the Registration Statement on Form 8-A of Boston Properties, Inc. filed on March 22, 2013.)
4.4	—	Indenture, dated as of December 13, 2002, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee. (Incorporated by reference to Exhibit 4.1 to Boston Properties, Inc.’s Current Report on Form 8-K/A filed on December 13, 2002.)
4.5	—	Supplemental Indenture No. 3, dated as of March 18, 2003, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee, including a form of the 5.625% Senior Note due 2015. (Incorporated by reference to Exhibit 4.6 to Boston Properties Limited Partnership’s Amendment No. 3 to Form 10 filed on May 13, 2003.)

173

4.6	—	Supplemental Indenture No. 4, dated as of May 22, 2003, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee, including a form of the 5.00% Senior Note due 2015. (Incorporated by reference to Exhibit 4.2 to Boston Properties Limited Partnership’s Form S-4 filed on June 13, 2003, File No. 333-106127.)
4.7	—	Supplemental Indenture No. 7, dated as of August 19, 2008, between the Company and the Trustee, including a form of the 3.625% Exchangeable Senior Note due 2014. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on August 20, 2008.)
4.8	—	Supplemental Indenture No. 8, dated as of October 9, 2009, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 5.875% Senior Note due 2019. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on October 9, 2009.)
4.9	—	Supplemental Indenture No. 9, dated as of April 19, 2010, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 5.625% Senior Note due 2020. (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on April 19, 2010.)
4.10	—	Supplemental Indenture No. 10, dated as of November 18, 2010, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 4.125% Senior Note due 2021 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on November 18, 2010.)
4.11	—	Supplemental Indenture No. 11, dated as of November 10, 2011, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.700% Senior Note due 2018 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on November 10, 2011.)
4.12	—	Supplemental Indenture No. 12, dated as of June 11, 2012, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.85% Senior Note due 2023 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on June 11, 2012.)
4.13	—	Supplemental Indenture No. 13, dated as of April 11, 2013, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.125% Senior Note due 2023 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on April 11, 2013.)
4.14	—	Supplemental Indenture No. 14, dated as of June 27, 2013, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 3.800% Senior Note due 2024 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on July 1, 2013.)
4.15	—	Registration Rights Agreement, dated as of August 19, 2008, among the Company, Boston Properties, Inc., JP Morgan Securities Inc., Morgan Stanley & Co. Incorporated, Banc of America Securities LLC, Deutsche Bank Securities Inc. and Citigroup Global Markets Inc., as the representatives of the initial purchasers of the Notes. (Incorporated by reference to Exhibit 4.3 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on August 20, 2008.)

174

10.1	—	Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of June 29, 1998. (Incorporated by reference to Exhibit 99.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on July 15, 1998.)
10.2	—	Certificate of Designations for the Series Two Preferred Units, dated November 12, 1998, constituting an amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 99.24 to Boston Properties, Inc.’s Current Report on Form 8-K filed on November 25, 1998.)
10.3	—	Certificate of Designations for the Series Four Preferred Units, dated as of August 29, 2012, constituting an amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 10-Q of Boston Properties, Inc. filed on November 8, 2012.)
10.4	—	Certificate of Designations for the 5.25% Series B Cumulative Redeemable Preferred Units, dated as of March 20, 2013, constituting an amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on March 22, 2013.)
10.5*	—	Forty-Seventh Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of April 11, 2003, by Boston Properties, Inc., as general partner. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on August 14, 2003.)
10.6*	—	Seventy-Seventh Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of January 24, 2008, by Boston Properties, Inc., as general partner. (Incorporated by reference to Exhibit 10.3 to Boston Properties, Inc.’s Current Report on Form 8-K filed on January 29, 2008.)
10.7	—	Ninety-Eighth Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of October 21, 2010. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 5, 2010.)
10.8*	—	Boston Properties, Inc. 2012 Stock Option and Incentive Plan. (Incorporated by reference to Exhibit A to Boston Properties, Inc.’s Proxy Statement on Schedule 14A filed on March 30, 2012.)
10.9*	—	Form of 2011 Outperformance Award Agreement. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Current Report on Form 8-K filed on January 21, 2011.)
10.10*	—	Form of 2012 Outperformance Award Agreement. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on May 8, 2012.)
10.11*	—	Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.59 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 15, 2005.)
10.12*	—	First Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.60 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 15, 2005.)
10.13*	—	Second Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.61 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 15, 2005.)

175

10.14*	—	Boston Properties Deferred Compensation Plan, Amended and Restated Effective as of January 1, 2009. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.15*	—	Employment Agreement by and between Mortimer B. Zuckerman and Boston Properties, Inc. dated as of January 17, 2003. (Incorporated by reference to Exhibit 10.7 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.16*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.17*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.13 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.18*	—	Transition Benefits Agreement by and between Mortimer B. Zuckerman and Boston Properties, Inc. dated March 10, 2013 (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K of Boston Properties, Inc. filed on March 11, 2013.)
10.19*	—	Third Amendment to Employment Agreement by and between Mortimer B. Zuckerman and Boston Properties, Inc. dated March 10, 2013 (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K of Boston Properties, Inc. filed on March 11, 2013.)
10.20*	—	Employment Agreement by and between Owen D. Thomas and Boston Properties, Inc. dated March 10, 2013 (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on March 11, 2013.)
10.21*	—	Employment Agreement by and between Douglas T. Linde and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.12 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.22*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Douglas T. Linde. (Incorporated by reference to Exhibit 10.3 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.23*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Douglas T. Linde. (Incorporated by reference to Exhibit 10.19 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.24*	—	Amended and Restated Employment Agreement by and between Raymond A. Ritchey and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.15 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.25*	—	First Amendment to Amended and Restated Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Raymond A. Ritchey. (Incorporated by reference to Exhibit 10.4 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.26*	—	Second Amendment to Amended and Restated Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Raymond A. Ritchey. (Incorporated by reference to Exhibit 10.22 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.27*	—	Employment Agreement by and between Michael E. LaBelle and Boston Properties, Inc. dated as of January 24, 2008. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.’s Current Report on Form 8-K filed on January 29, 2008.)

176

10.28*	—	First Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Michael E. LaBelle. (Incorporated by reference to Exhibit 10.27 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.29*	—	Employment Agreement by and between Peter D. Johnston and Boston Properties, Inc. dated as of August 25, 2005. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2005.)
10.30*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Peter D. Johnston. (Incorporated by reference to Exhibit 10.6 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.31*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Peter D. Johnston. (Incorporated by reference to Exhibit 10.30 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.32*	—	Employment Agreement by and between Bryan J. Koop and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.33*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Bryan J. Koop. (Incorporated by reference to Exhibit 10.7 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.34*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Bryan J. Koop. (Incorporated by reference to Exhibit 10.33 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.35*	—	Employment Agreement by and between Robert E. Pester and Boston Properties, Inc. dated as of December 16, 2002. (Incorporated by reference to Exhibit 10.14 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.36*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Robert E. Pester. (Incorporated by reference to Exhibit 10.9 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.37*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Robert E. Pester. (Incorporated by reference to Exhibit 10.40 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.38*	—	Employment Agreement by and between Mitchell S. Landis and Boston Properties, Inc. dated as of November 26, 2002. (Incorporated by reference to Exhibit 10.11 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.39*	—	First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Mitchell S. Landis. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.40*	—	Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Mitchell S. Landis. (Incorporated by reference to Exhibit 10.43 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.41*		Employment Agreement by and between John F. Powers and Boston Properties, Inc. dated as of November 4, 2013. (Filed herewith.)
10.42*	—	Senior Executive Severance Agreement by and among Boston Properties, Inc., Boston Properties Limited Partnership and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.17 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)

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10.43*	—	First Amendment to the Senior Executive Severance Agreement, dated as of November 1, 2007, by and among Boston Properties, Inc., Boston Properties Limited Partnership and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.11 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.44*	—	Second Amendment to the Senior Executive Severance Agreement, dated as of December 15, 2008, by and among Boston Properties, Inc., Boston Properties Limited Partnership and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.46 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.45*	—	Boston Properties, Inc. Senior Executive Severance Plan. (Incorporated by reference to Exhibit 10.19 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.46*	—	First Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.13 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.47*	—	Second Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of December 15, 2008. (Incorporated by reference to Exhibit 10.52 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.48*	—	Third Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of January 8, 2014. (Filed herewith.)
10.49*	—	Boston Properties, Inc. Executive Severance Plan, dated as of July 30, 1998. (Incorporated by reference to Exhibit 10.20 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 27, 2003.)
10.50*	—	First Amendment to the Boston Properties, Inc. Executive Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.14 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.51*	—	Second Amendment to the Boston Properties, Inc. Executive Severance Plan, dated as of January 8, 2014. (Filed herewith.)
10.52*	—	Boston Properties, Inc. Officer Severance Plan, dated as of July 30, 1998. (Incorporated by reference to Exhibit 10.15 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.53*	—	First Amendment to the Boston Properties, Inc. Officer Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.16 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on November 9, 2007.)
10.54*	—	Second Amendment to the Boston Properties, Inc. Officer Severance Plan, dated as of December 15, 2008. (Incorporated by reference to Exhibit 10.57 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on March 2, 2009.)
10.55*	—	Form of Indemnification Agreement by and among Boston Properties, Inc., Boston Properties Limited Partnership and certain officers and directors of the Company. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.’s Quarterly Report on Form 10-Q filed on August 9, 2004.)
10.56*	—	Director Appointment Agreement, dated as of January 20, 2011, by and between Matthew J. Lustig and Boston Properties, Inc. (Incorporated by reference to Exhibit 10.55 to Boston Properties, Inc.’s Annual Report on Form 10-K filed on February 25, 2011.)

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10.57	—	Seventh Amended and Restated Revolving Credit Agreement, dated as of July 26, 2013, among Boston Properties Limited Partnership and the lenders identified therein (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on July 29, 2013.)
12.1	—	Statement re Computation of Ratios. (Filed herewith.)
21.1	—	Subsidiaries of Boston Properties, Inc. (Filed herewith.)
23.1	—	Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting firm. (Filed herewith.)
31.1	—	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)
31.2	—	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)
32.1	—	Section 1350 Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)
32.2	—	Section 1350 Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)
101	—	The following materials from Boston Properties, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 formatted in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statements of Comprehensive Income, (iv) the Consolidated Statements of Stockholders’ Equity, (v) the Consolidated Statements of Cash Flows, and (vi) related notes to these financial statements.

* Indicates management contract or compensatory plan or arrangement required to be filed or incorporated by reference as an exhibit to this Form 10-K pursuant to Item 15(b) of Form 10-K.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	BOSTON PROPERTIES, INC.
February 28, 2014		/s/    MICHAEL E. LABELLE
		Michael E. LaBelle
		Chief Financial Officer (duly authorized officer and principal financial and accounting officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant, and in the capacities and on the dates indicated.

February 28, 2014	By:	/s/    MORTIMER B. ZUCKERMAN
		Mortimer B. Zuckerman Executive Chairman
	By:	/s/    OWEN D. THOMAS
		Owen D. Thomas Director and Chief Executive Officer
	By:	/s/    DOUGLAS T. LINDE
		Douglas T. Linde Director and President
	By:	/s/    ZOË BAIRD BUDINGER
		Zoë Baird Budinger Director
	By:	/s/    CAROL B. EINIGER
		Carol B. Einiger Director
	By:	/s/    DR. JACOB A. FRENKEL
		Dr. Jacob A. Frenkel Director
	By:	/s/    JOEL I. KLEIN
		Joel I. Klein Director
	By:	/s/    MATTHEW J. LUSTIG
		Matthew J. Lustig Director
	By:	/s/    ALAN J. PATRICOF
		Alan J. Patricof Director
	By:	/S/    MARTIN TURCHIN
		Martin Turchin Director

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By:	/s/    DAVID A. TWARDOCK
	David A. Twardock Director
By:	/s/    MICHAEL E. LABELLE
	Michael E. LaBelle Senior Vice President, Chief Financial Officer (Principal Financial and Accounting Officer)

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EX-10.41

Exhibit 10.41

EMPLOYMENT AGREEMENT

THIS AGREEMENT (the “Agreement”) is made as of the 4^th day of November, 2013 by and between John F. Powers (“Employee”) and Boston Properties, Inc., a Delaware corporation, with its principal executive office located at 800 Boylston Street, Boston, Massachusetts 02199-8103 (together with its subsidiaries, the “Company”).

WITNESSETH THAT:

WHEREAS, the Company desires to employ Employee as its Regional Manager for the New York region on the terms hereinafter set forth;

WHEREAS, Employee wishes to be so employed pursuant to the terms hereinafter set forth;

NOW, THEREFORE, in consideration of the mutual covenants and premises set forth herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and Employee hereby agree as follows:

1.     Term. Subject to the provisions of Paragraph 8, the term of employment pursuant to this Agreement (the “Initial Term”) shall be two (2) years commencing January 2, 2014 (the “Commencement Date”). The Initial Term shall be renewed automatically for periods of one (1) year (each, an “Extended Term”) commencing at the second and third anniversary of the Commencement Date, unless written notice of non-renewal is given by either party to the other not less than ninety (90) days prior to the end of the Initial Term or any Extended Term. As used herein, “Term” shall include the Initial Term and any Extended Term, but the Term shall end upon any termination of Employee’s employment with the Company as provided herein. Notwithstanding the foregoing, in the event a Change in Control (as defined in Subparagraph 9(d)) occurs during the Initial Term or any Extended Term, the Term shall be extended until twelve (12) months after the Change in Control.

2.     Employment; Duties; Location.

(a)     During the Term, Employee shall initially serve as an officer of the Company with the title Senior Vice President, Regional Manager. Employee’s duties and authority shall be commensurate with his title and position with the Company. Employee shall report directly to the President and shall serve the Company in such other capacity or capacities as the Employee may be requested to serve by the Board of Directors of the Company (the “Board of Directors”). In such capacity or capacities, Employee shall perform such services and duties in connection with the business, affairs and operations of the Company as may be assigned or delegated to Employee from time to time by or under the authority of the Board of Directors. Employee shall be principally located at the Company’s New York office.

(b)     Employee agrees to his employment as described in this Paragraph 2 and agrees to devote substantially all of his working time and efforts to the performance of his duties hereunder, except as otherwise approved by the Board of Directors. Notwithstanding the foregoing, nothing herein shall be interpreted to preclude Employee from (i) engaging in

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Minority Interest Passive Investments (as defined below), including Minority Interest Passive Investments in, or relating to the ownership, development, operation, management, or leasing of, commercial real estate properties, (ii) participating as an officer or director of, or advisor to, any charitable or other tax exempt organization; provided that such activities and related duties and pursuits do not restrict Employee’s ability to fulfill his obligations as an officer and employee of the Company as set forth herein or (iii) receiving compensation from his prior employer with respect to services Employee completed prior to the Commencement Date so long as a description of such compensatory arrangements has been provided to the Company prior to the Commencement Date.

Engaging in a “Minority Interest Passive Investment” means acquiring, holding, and exercising the voting rights associated with an investment made through (i) the purchase of securities (including partnership interests) that represent a non-controlling, minority interest in an entity or (ii) the lending of money, in either case with the purpose or intent of obtaining a return on such investment but without management by Employee of the property or business to which such investment directly or indirectly relates and without any business or strategic consultation by Employee with such entity.

3.     Compensation.

(a)     Base Salary. The Company shall pay Employee an annual salary of Four Hundred Thousand Dollars ($400,000) (the “Base Salary”), payable in accordance with the Company’s normal business practices for senior executives (including tax withholding), but in no event less frequently than monthly. Employee’s Base Salary shall be reviewed at least annually by the Compensation Committee of the Board of Directors (the “Compensation Committee”) and may be increased but not decreased in its discretion.

(b)     Bonus. On each annual compensation determination date established by the Company during the Term, beginning with such date in 2015, the Company shall review the performance of the Company and of Employee during the prior year, and the Company may provide Employee with additional compensation as a bonus if the Compensation Committee, in its discretion, determines that Employee’s contribution to the Company warrants such additional payment and the Company’s anticipated financial performance for the present period permits such payment. Employee’s annual target cash bonus shall be 130 percent of his Base Salary. Cash bonus for any calendar year shall be paid no later than March 15 of the following calendar year.

4.     Benefits.

(a)     Medical/Dental Insurance. Employee shall be entitled to participate in any and all health plans, including all medical and dental insurance plans as in effect from time to time for senior executives of the Company. Such participation shall be subject to (i) the terms of the applicable plan documents, (ii) generally applicable policies of the Company, and (iii) the discretion of the Board of Directors, the Compensation Committee or any administrative or other committee provided for in, or contemplated by, such plan. Nothing contained in this Agreement shall be construed to create any obligation on the part of the Company to establish any such plan or to maintain the effectiveness of any such plan which may be in effect from time to time.

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(b)     Life Insurance/Disability Insurance. The Company shall provide Employee with such life and/or disability insurance as the Company may from time to time make available to senior executives of the Company.

(c)     Expenses. The Company shall promptly reimburse Employee for all reasonable business expenses incurred by Employee in accordance with the practices of the Company for senior executives of the Company, as in effect from time to time.

(d)     Vacation. Employee shall receive paid vacation annually in accordance with terms determined for such Employee by the Company, but in no event shall Employee receive less than four weeks of paid vacation per year.

(e)     Stock Options, Restricted Stock and/or LTIP Units. On each annual compensation determination date established by the Company during the Term, beginning with such date in 2015, Employee shall be entitled to grants of stock options, restricted stock awards and/or LTIP units in such form and amounts and with such terms and conditions as determined by the Compensation Committee in its discretion under the Boston Properties, Inc. 2012 Stock Option and Incentive Plan or any other stock option plan adopted by the Company from time to time (the “Stock Option Plan”). Employee’s annual target equity award shall be 200 percent of his Base Salary.

(f)     Deferred Compensation. Employee shall be entitled to participate in any deferred compensation plan or arrangement that the Company may have in place for its senior executives and/or officers.

(g)     Other Benefits. The Company shall provide to Employee such other benefits, including the right to participate in such retirement or pension plans, as are made generally available to senior executives of the Company from time to time. Such participation shall be subject to (i) the terms of the applicable plan documents, (ii) generally applicable policies of the Company, and (iii) the discretion of the Board of Directors, the Compensation Committee, or any administrative or other committee provided for in, or contemplated by, such plan.

(h)     Taxation of Payments and Benefits. The Company shall undertake to make deductions, withholdings and tax reports with respect to payments and benefits under this Agreement to the extent that it reasonably and in good faith believes that it is required to make such deductions, withholdings and tax reports. Payments under this Agreement shall be in amounts net of any such deductions or withholdings. Nothing in this Agreement shall be construed to require the Company to make any payments to compensate Employee for any adverse tax effect associated with any payments or benefits or for any deduction or withholding from any payment or benefit.

5.     Indemnification. To the full extent permitted by law and subject to the Company’s Certificate of Incorporation and Bylaws, the Company shall indemnify Employee with respect to any actions commenced against Employee in his capacity as a director or officer or former director or officer of the Company, or any affiliate thereof for which he may serve in such capacity, and the Company shall advance on a timely basis any expenses incurred in defending such actions. The obligation to indemnify hereunder shall survive the termination of this Agreement. The Company agrees to use its best efforts to secure and maintain directors’ and officers’ liability insurance with respect to Employee.

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6.     Company Authority/Policies. Employee agrees to observe and comply with the rules and regulations of the Company as adopted by its Board of Directors respecting the performance of his duties and to carry out and perform orders, directions and policies communicated to him from time to time by the Board of Directors.

7.     Records/Nondisclosure/Company Policies.

(a)     General. All records, financial statements and similar documents obtained, reviewed or compiled by Employee in the course of the performance by him of services for the Company, whether or not confidential information or trade secrets, shall be the exclusive property of the Company. Employee shall have no rights in such documents upon any termination of Employee’s employment.

(b)     Confidential Information. Employee will not disclose to any person or entity (except as required by applicable law, the rules of the New York Stock Exchange, or otherwise in connection with the performance of his duties and responsibilities hereunder), or use for his own benefit or gain, any confidential information of the Company obtained by him incident to his relationship with the Company, whether before or after the Commencement Date. Employee shall take all reasonable steps to safeguard any confidential information and to protect such confidential information against disclosure, misuse, loss, or theft. The term “confidential information” includes, without limitation, financial information, business plans, prospects, and opportunities which have been discussed or considered by the management of the Company, but does not include any information which has become part of the public domain by means other than Employee’s non-observance of his obligations hereunder.

This Paragraph 7 shall survive the termination of this Agreement.

8.     Termination/Severance.

(a)     General.

(i)     At Will Employment. Employee’s employment hereunder is “at will” and, therefore, may be terminated at any time, with or without cause, at the option of the Company or Employee, subject only to the severance obligations under this Paragraph 8.

(ii)     Notice of Termination. Except for termination as a result of Employee’s death as specified in Subparagraph 8(b), during the Term, any termination of Employee’s employment by the Company or any such termination by Employee shall be communicated by written Notice of Termination to the other party hereto. For purposes of this Agreement, a “Notice of Termination” shall mean a notice which shall indicate the specific termination provision hereunder relied upon by the terminating party.

(iii)     Date of Termination. “Date of Termination” shall mean: (A) if Employee’s employment is terminated by his death, the date of his death; (B) if Employee’s

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employment is terminated on account of disability under Subparagraph 8(c), the date on which Notice of Termination is given by the Company, or such later date as is indicated in the Notice of Termination; (C) if Employee’s employment is terminated by the Company for Cause under Subparagraph 8(d), the date on which a Notice of Termination is given by the Company; (D) if Employee’s employment is terminated by the Company without Cause under Subparagraph 8(e)(i), thirty (30) days after the date on which a Notice of Termination is given by the Company, or such later date as is indicated in the Notice of Termination; (E) if Employee’s employment is terminated by Employee under Subparagraph 8(f), thirty (30) days after the date on which a Notice of Termination is given by Employee, or such other date as is mutually agreed by Employee and the Company; and (F) if Employee’s employment is terminated by Employee under Subparagraph 8(e)(ii) for Good Reason, the date on which the Notice of Termination is given by Employee after the end of the thirty (30) day cure period, or such other date as is mutually agreed by Employee and the Company.

(b)     Death. If Employee dies during the Term, the Term shall terminate as of the date of death and the Company shall, within ninety (90) days of death, pay in a lump sum amount to such person as Employee shall designate in a notice filed with the Company or, if no such person is designated, to Employee’s estate, Employee’s accrued and unpaid Base Salary to his date of death, plus his accrued and unpaid target bonus for the calendar year of termination, prorated for the number of days actually employed in the then current calendar year, to the extent unpaid on the Date of Termination. All unvested stock options and stock-based grants with time-based vesting shall vest and become exercisable by Employee’s estate or other legal representatives or nonforfeitable, as applicable, on the Date of Termination, and all unvested stock options and stock-based grants with performance-based vesting shall vest and become exercisable by Employee’s estate or other legal representatives or nonforfeitable, as applicable, to the extent provided in the applicable award agreements, and Employee’s estate or other legal representatives shall have such period of time to exercise the stock options as is provided in the Stock Plan and agreements with Employee pursuant thereto. For a period of eighteen (18) months following the Date of Termination, and subject to the continued copayment of premium amounts by Employee’s spouse and dependents in amounts consistent with that applicable to active employees, Employee’s spouse and dependents shall continue to participate in the Company’s health insurance plan (medical, dental and vision) upon the same terms and conditions in effect on the Date of Termination, provided, however, that (i) the continuation of health benefits under this Subparagraph shall reduce and count against the rights of Employee’s spouse and dependents under the Consolidated Omnibus Budget Reconciliation Act of 1986, as amended (“COBRA”), and (ii) the value of premiums paid by the Company shall be reportable as taxable income to Employee’s spouse to the extent required by applicable law in order for the benefits received by Employee’s spouse and dependents to be non-taxable or to avoid imposition of penalty taxes on the Company pursuant to the Patient Protection and Affordable Care Act. In addition to the foregoing, any payments to which Employee’s spouse, beneficiaries, or estate may be entitled under any employee benefit plan shall also be paid in accordance with the terms of such plan or arrangement. Such payments, in the aggregate, shall fully discharge the Company’s obligations hereunder.

(c)     Disability. If during the Term, as a result of Employee’s incapacity due to physical or mental illness, Employee shall have been absent from his duties hereunder on a full-time basis for one hundred eighty (180) calendar days in the aggregate in any twelve (12) month

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period, the Company may terminate Employee’s employment hereunder and the Company shall, within ninety (90) days of such termination, pay in a lump sum amount to Employee, Employee’s accrued and unpaid Base Salary to his Date of Termination, plus his accrued and unpaid target bonus for the calendar year of termination, prorated for the number of days actually employed in the then current calendar year, to the extent unpaid on the Date of Termination. During any period during the Term that Employee fails to perform his duties hereunder as a result of incapacity due to physical or mental illness, but prior to Employee’s termination in accordance with the preceding sentence or otherwise under this Agreement, Employee shall continue to be treated as an active employee for all purposes under this Agreement and any other benefit and compensation arrangements of the Company. All unvested stock options and stock-based grants with time-based vesting shall vest and become exercisable or nonforfeitable, as applicable, on the Date of Termination, and all unvested stock options and stock-based grants with performance-based vesting shall vest and become exercisable or nonforfeitable, as applicable, to the extent provided in the applicable award agreements, and Employee shall have such period of time to exercise the stock options as is provided in the Stock Plan and agreements with Employee pursuant thereto. For a period of eighteen (18) months following the Date of Termination and subject to Employee’s continued copayment of premium amounts in amounts consistent with that applicable to active employees, Employee, Employee’s spouse and dependents shall continue to participate in the Company’s health insurance plan (medical, dental and vision) upon the same terms and conditions in effect on the Date of Termination, provided, however, that (i) the continuation of health benefits under this Subparagraph shall reduce and count against Employee’s rights under COBRA, and (ii) the value of premiums paid by the Company shall be reportable as taxable income to Employee to the extent required by applicable law in order for the benefits received by Employee’s spouse and dependents to be non-taxable or to avoid imposition of penalty taxes on the Company pursuant to the Patient Protection and Affordable Care Act. In addition to the foregoing, any payments to which Employee may be entitled under any employee benefit plan shall also be paid in accordance with the terms of such plan or arrangement. Such payments, in the aggregate, shall fully discharge the Company’s obligations hereunder.

(d)     Termination by the Company for Cause.

(i)     The Company may terminate Employee’s employment hereunder for Cause. “Cause” shall mean: (A) gross negligence or willful misconduct by Employee in connection with the performance of his material duties hereunder; (B) a breach by Employee of any of his material duties hereunder (for reasons other than physical or mental illness) and the failure of Employee to cure such breach within thirty (30) days after written notice thereof by the Company; (C) conduct by Employee against the material best interests of the Company or a material act of common law fraud against the Company or its affiliates or employees; or (D) indictment of Employee of a felony and such indictment has a material adverse effect on the interests or reputation of the Company.

(ii)     If during the Term, Employee’s employment is terminated by the Company for Cause, then the Company shall, through the Date of Termination, pay Employee his accrued and unpaid Base Salary. Thereafter, the Company shall have no further obligations to Employee except as otherwise provided hereunder; provided that any such termination shall not adversely affect or alter Employee’s rights under any employee benefit plan of the Company

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in which Employee, at the Date of Termination, has a vested interest, unless otherwise provided in such employee benefit plan or any agreement or other instrument attendant thereto. Notwithstanding the foregoing and in addition to whatever other rights or remedies the Company may have at law or in equity, all stock options and other stock-based grants held by Employee, whether vested or unvested as of the Date of Termination, shall immediately expire on the Date of Termination if Employee’s employment is terminated by the Company for Cause.

(e)     Termination by the Company without Cause or by Employee for Good Reason.

(i)     The Company may terminate Employee’s employment hereunder without Cause if such termination is approved by the Chief Executive Officer or President of the Company. Any termination by the Company of Employee’s employment hereunder which does not (A) constitute a termination for Cause under Subparagraph (d)(i), (B) result from the death or disability of Employee under Subparagraph (b) or (c), or (C) result from the expiration of the Term, shall be deemed a termination without Cause.

(ii)     Employee may terminate his employment hereunder for Good Reason. “Good Reason” shall mean: (A) a substantial adverse change, not consented to by Employee, in the nature or scope of Employee’s responsibilities, authorities, powers, functions, or duties under this Agreement; (B) a breach by the Company of any of its material obligations hereunder; or (C) a material change in the geographic location at which Employee must perform his services. To constitute Good Reason termination, Employee (1) must provide written notice to the Company within ninety (90) days of the initial existence of the event constituting Good Reason, (2) may not terminate his employment pursuant to this Subparagraph unless the Company fails to remedy the event constituting Good Reason within thirty (30) days after such notice has been deemed given pursuant to this Agreement (the “Cure Period”), and (3) Employee must terminate employment with the Company no later than thirty (30) days after the end of the Cure Period and only if the Company fails to remedy the event constituting Good Reason within the Cure Period.

(iii)     If during the Term, Employee’s employment is terminated by the Company without Cause or if Employee terminates his employment for Good Reason in accordance with this Subparagraph (e), then the Company shall, through the Date of Termination, pay Employee his accrued and unpaid Base Salary and his accrued and unpaid target bonus for the calendar year of termination, prorated for the number of days actually employed in the then current calendar year, to the extent unpaid on the Date of Termination. In addition, subject to signing by Employee of a separation agreement containing, among other provisions, a general release of claims in favor of the Company and related persons and entities, confidentiality, return of property and non-disparagement, in a form and manner reasonably satisfactory to the Company (the “Separation Agreement and Release”) and the Separation Agreement and Release becoming irrevocable, all within thirty (30) days after the Date of Termination, Employee shall be entitled to the following:

(A)     Salary continuation in an amount (the “Severance Amount”) equal to the sum of (x) his annual Base Salary under Subparagraph 3(a) and (y) the amount of his cash bonus, if any, received in respect of the immediately preceding year under

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Subparagraph 3(b). The Severance Amount shall be paid in equal installments in accordance with the Company’s then payroll practice over a twelve (12) month period beginning with the first payroll date that occurs at least thirty (30) days after the Date of Termination. Solely for purposes of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), each installment payment is considered a separate payment;

(B)     All stock options and other stock-based awards with time-based vesting in which Employee would have vested if he had remained employed for a period of twelve (12) months commencing on the Date of Termination shall vest and become exercisable or nonforfeitable, as applicable, as of the Date of Termination, and all stock options and other stock-based awards with performance-based vesting held by Employee shall become exercisable or nonforfeitable to the extent provided in the applicable award agreements.

(C)     For a period of twelve (12) months following the Date of Termination or until Employee becomes covered under a group health plan of another employer, whichever is earlier, subject to Employee’s continued copayment of premium amounts in amounts consistent with that applicable to active employees, Employee, Employee’s spouse and dependents shall continue to participate in the Company’s health insurance plan (medical, dental and vision) upon the same terms and conditions in effect for other executives of the Company; provided, however, that (x) the continuation of health benefits under this Subparagraph shall reduce and count against the rights of Employee, Employee’s spouse and dependents under COBRA, and (y) the value of premiums paid by the Company shall be reported as taxable income to Employee to the extent required by applicable law in order for the benefits received by Employee’s spouse and dependents to be non-taxable or to avoid imposition of penalty taxes on the Company pursuant to the Patient Protection and Affordable Care Act; and

(D)     Subject to (B) above, all rights and benefits granted or in effect with respect to Employee under the Stock Option Plan and agreements with Employee pursuant thereto.

(f)     Voluntary Termination by Employee. Employee may terminate his employment hereunder for any reason, including, but not limited to, Good Reason in accordance with Subparagraph (e)(ii). If Employee’s employment is terminated by Employee other than for Good Reason, then the Company shall, through the Date of Termination, pay Employee his accrued and unpaid Base Salary. Thereafter, the Company shall have no further obligations to Employee except as otherwise expressly provided hereunder; provided any such termination shall not adversely affect or alter Employee’s rights under any employee benefit plan of the Company in which Employee, at the Date of Termination, has a vested interest, unless otherwise provided in such employee benefit plan or any agreement or other instrument attendant thereto. The vesting and exercise of any stock options and the forfeitability of any stock-based grants held by Employee shall be governed by the terms of the Stock Option Plan and the related agreements between Employee and the Company

(g)     Expiration/Non-Renewal of Term by the Company. For the avoidance of doubt, a non-renewal of the Term of this Agreement by the Company (in accordance with Paragraph 1 above) will not constitute a termination of employment by the Company without Cause and Employee acknowledges that the severance provisions of Paragraphs 8 and 9 shall not

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apply. Notwithstanding the foregoing, if Employee completes at least four (4) years of service with the Company, he shall become fully vested in any stock options and other stock-based awards with time-based vesting upon his termination of employment.

(h)     No Mitigation. Without regard to the reason for the termination of Employee’s employment hereunder, Employee shall be under no obligation to mitigate damages with respect to such termination under any circumstances and in the event Employee is employed or receives income from any other source, there shall be no offset against the amounts due from the Company hereunder.

9.     Change in Control Payment. The provisions of this Paragraph 9 set forth certain terms of an agreement reached between Employee and the Company regarding Employee’s rights and obligations upon the occurrence of a Change in Control of the Company. These provisions are intended to assure and encourage in advance Employee’s continued attention and dedication to his assigned duties and his objectivity during the pendency and after the occurrence of any such event. These provisions shall apply in lieu of, and expressly supersede, the provisions of Subparagraph 8(e) regarding severance pay and benefits upon an involuntary termination of employment, if such termination of employment occurs during the Term upon or within twelve (12) months after the occurrence of the first event constituting a Change in Control. These provisions shall terminate and be of no further force or effect beginning twelve (12) months after the occurrence of a Change in Control, at which point the provisions of Subparagraph 8(e) shall again become effective in accordance with their terms. For the avoidance of doubt, Employee’s Change in Control benefits shall be governed solely by this Paragraph 9, and Employee shall not participate in any Change in Control severance plans or programs maintained by the Company.

(a)     Vesting of Equity Awards. Upon a Change in Control, all stock options and other stock-based awards with time-based vesting held by Employee shall immediately accelerate and become fully exercisable or nonforfeitable and all stock options and other stock-based awards with performance-based vesting held by Employee shall become exercisable or nonforfeitable to the extent provided in the applicable award agreements.

(b)     Change in Control Benefits. During the Term, if upon or within twelve (12) months after a Change in Control, Employee’s employment is terminated by the Company without Cause or Employee terminates his employment for Good Reason, then the Company shall, through the Date of Termination, pay Employee his accrued and unpaid Base Salary and his target bonus for the calendar year of termination, prorated for the number of days actually employed in the then current calendar year, to the extent unpaid on the Date of Termination. In addition,

(i)     the Company shall pay Employee a lump sum in cash in an amount equal to two (2) times the sum of (x) his annual Base Salary under Subparagraph 3(a) (or Employee’s Base Salary in effect immediately prior to the Change in Control, if higher) and (y) Employee’s average annual cash bonus under Subparagraph 3(b) received with respect to the three (3) calendar years preceding the Change in Control, or the average of such bonus over the number of calendar years preceding the Change in Control in respect of which such bonus was paid if less than three (3) calendar years. Such amount shall be paid in one lump sum payment

9

on the Date of Termination; provided, however, that if the Change in Control does not constitute a change in the ownership or effective control of the Company, or in the ownership of a substantial portion of the assets of the Company, within the meaning of Section 409A of the Code, the amount of cash severance payable under this Subparagraph equal to the Severance Amount under Subparagraph 8(e)(iii)(A) shall be paid in equal installments in accordance with the Company’s then payroll practice over a twelve (12) month period beginning with the first payroll date that occurs thirty (30) days after the Date of Termination, and the balance shall be paid in a lump sum payment on the Date of Termination. Solely for purposes of Section 409A of the Code, each installment payment is considered a separate payment;

(ii)     for a period of twelve (12) months following the Date of Termination or until Employee becomes covered under a group health plan of another employer, whichever is earlier, subject to Employee’s continued copayment of premium amounts in amounts consistent with that applicable to active employees, Employee, Employee’s spouse and dependents shall continue to participate in the Company’s health insurance plan (medical, dental and vision) upon the same terms and conditions in effect for other executives of the Company; provided, however, that (x) the continuation of health benefits under this Subparagraph shall reduce and count against the rights of Employee, Employee’s spouse and dependents under COBRA, and (y) the value of premiums paid by the Company shall be reported as taxable income to Employee to the extent required by applicable law in order for the benefits received by Employee’s spouse and dependents to be non-taxable or to avoid imposition of penalty taxes on the Company pursuant to the Patient Protection and Affordable Care Act; and

(iii)     the Company shall reimburse Employee for financial counseling, tax preparation assistance and out-placement counseling for twelve (12) months after the Date of Termination.

(c)     Additional Limitation.

(i)     Anything in this Agreement to the contrary notwithstanding, in the event that the amount of any compensation, payment or distribution by the Company to or for the benefit of Employee, whether paid or payable or distributed or distributable pursuant to the terms of this Agreement or otherwise, calculated in a manner consistent with Section 280G of the Code and the applicable regulations thereunder (the “Payments”), would be subject to the Excise Tax, the following provisions shall apply:

(A)     If the Payments, reduced by the sum of (1) the Excise Tax and (2) the total of the Federal, state, and local income and employment taxes payable by Employee on the amount of the Payments which are in excess of the Threshold Amount, are greater than or equal to the Threshold Amount, Employee shall be entitled to the full benefits payable under this Agreement.

(B)     If the Threshold Amount is less than (x) the Payments, but greater than (y) the Payments reduced by the sum of (1) the Excise Tax and (2) the total of the Federal, state, and local income and employment taxes on the amount of the Payments which are in excess of the Threshold Amount, then the Payments shall be reduced (but not below zero) to the minimum extent necessary so that the sum of all Payments shall not exceed the Threshold

10

Amount. In such event, the Severance Payments shall be reduced in the following order: (1) cash payments not subject to Section 409A of the Code; (2) cash payments subject to Section 409A of the Code (to the extent such reduction does not result in tax penalties to Employee); (3) equity-based payments and acceleration; and (4) non-cash forms of benefits. To the extent any payment is to be made over time (e.g., in installments, etc.), then the payments shall be reduced in reverse chronological order. No reductions shall be made under this Subclause (B) unless agreed by Employee.

(ii)     For the purposes of this Subparagraph 9(c), “Threshold Amount” shall mean three times Employee’s “base amount” within the meaning of Section 280G(b)(3) of the Code and the regulations promulgated thereunder less one dollar ($1.00); and “Excise Tax” shall mean the excise tax imposed by Section 4999 of the Code, and any interest or penalties incurred by Employee with respect to such excise tax.

(iii)     The determination as to which of the alternative provisions of Subparagraph 9(c)(i) shall apply to Employee shall be made by a nationally recognized accounting firm selected by the Company, which does not provide services to the acquirer or other counter-party in the transaction to which this Paragraph 9(c) applies (the “Accounting Firm”), which shall provide detailed supporting calculations both to the Company and Employee within 15 business days of the Date of Termination, if applicable, or at such earlier time as is reasonably requested by the Company or Employee. For purposes of determining which of the alternative provisions of Subparagraph 9(c)(i) shall apply, Employee shall be deemed to pay federal income taxes at the highest marginal rate of federal income taxation applicable to individuals for the calendar year in which the determination is to be made, and state and local income taxes at the highest marginal rates of individual taxation in the state and locality of Employee’s residence on the Date of Termination, net of the maximum reduction in federal income taxes which could be obtained from deduction of such state and local taxes. In making its determinations under this Paragraph 9(c), the Accounting Firm shall value the noncompetition obligations of Employee described in Paragraph 10 and take into account the maximum extent to which such value may be used to reduce the value of the Payments which otherwise could be subject to the Excise Tax. Subject to the last sentence of Subclause 9(c)(i)(B), any determination by the Accounting Firm shall be binding upon the Company and Employee.

(d)     “Change in Control” shall have the same meaning as defined in the Stock Plan, as amended from time to time.

10.     Noncompetition. Because Employee’s services to the Company are special and because Employee has access to the Company’s confidential information, Employee covenants and agrees that during Employee’s employment with the Company and until the end of a one-year period following the termination of Employee’s employment with the Company for any reason, Employee shall not, without the prior written consent of the Company (which shall be authorized by approval of the Board of Directors of the Company, including the approval of a majority of the independent Directors of the Company), directly or indirectly:

(a)     engage, participate or assist in, either individually or as an owner, partner, employee, consultant, director, officer, trustee, or agent of any business that engages or attempts to engage in, directly or indirectly, the acquisition, development, construction, operation, management, or leasing of any commercial real estate property in any of the Company’s Markets (as hereinafter defined) on the Date of Termination;

11

(b)     intentionally interfere with, disrupt or attempt to disrupt the relationship, contractual or otherwise, between the Company or its affiliates and any tenant, supplier, contractor, lender, employee, or governmental agency or authority; or

(c)     call upon, compete for, solicit, divert, or take away, or attempt to divert or take away any of the tenants or employees of the Company or its affiliates, either for himself or for any other business, operation, corporation, partnership, association, agency, or other person or entity.

“Market” as used herein means an area covering a 25 mile radius around (x) any property or land owned by the Company, under development by the Company or with respect to which the Company has an agreement or option to acquire a property, development or land or (y) any property or development for which the Company provides third party development or management services; provided that for any such property, development or land located in New York City, no such radial area shall extend beyond New York City.

This Paragraph 10 shall not be interpreted to prevent Employee from engaging in Minority Interest Passive Investments or any other activity permitted under Subparagraph 2(b). This Paragraph 10 shall survive the termination of this Agreement.

Notwithstanding anything to the contrary herein, the noncompetition provision of this Paragraph 10 shall not apply if Employee’s employment terminates after a Change in Control.

11.     Conflicting Agreements. Employee hereby represents and warrants that the execution of this Agreement and the performance of his obligations hereunder will not breach or be in conflict with any other agreement to which he is a party or is bound, and that he is not now subject to any covenants against competition or similar covenants which would affect the performance of his obligations hereunder.

12.     Notices. All notices, requests, demands, and other communications under this Agreement shall be in writing and shall be deemed duly given (i) if delivered by hand and receipted for by the party addressee, on the date of such receipt or (ii) if mailed by domestic certified or registered mail with postage prepaid, on the third business day after the date postmarked. Address for notice for the Company is as shown above, or as subsequently modified by written notice. Address for notice for Employee is the address shown on the records of the Company.

13.     Integration. This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior agreements between the parties with respect to any related subject matter; provided, however, that the Indemnification Agreement between the Company and Employee of even date hereof, as amended from time to time, shall remain in full force and effect hereafter.

14.     Assignment; Successors and Assigns, etc. Neither the Company nor Employee may make any assignment of this Agreement or any interest herein, by operation of law or

12

otherwise, without the prior written consent of the other party; provided that the Company may assign its rights under this Agreement without the consent of Employee to a successor to substantially all of the business of the Company in the event that the Company shall effect a reorganization, consolidate with or merge into any other corporation, partnership, organization or other entity, or transfer all or substantially all of its properties or assets to any other corporation, partnership, organization or other entity. This Agreement shall inure to the benefit of and be binding upon the Company and Employee, their respective successors, executors, administrators, heirs and permitted assigns.

15.     Miscellaneous. Headings herein are for convenience of reference only and shall not define, limit or interpret the contents hereof.

16.     Amendment. This Agreement may be amended, modified or supplemented by the mutual consent of the parties in writing, but no oral amendment, modification or supplement shall be effective.

17.     Arbitration; Other Disputes. Any dispute or controversy arising under or in connection with this Agreement shall be settled exclusively by arbitration in Boston, Massachusetts, in accordance with the rules of the American Arbitration Association then in effect. Judgment may be entered in any court having jurisdiction. Notwithstanding the above, the Company shall be entitled to seek a restraining order or injunction in any court of competent jurisdiction to prevent any continuation of any violation of Paragraph 7 or 10 hereof. In the event that the Company terminates Employee’s employment for Cause under Subparagraph 8(d)(i) and Employee contends that Cause did not exist, then the Company’s only obligation shall be to submit such claim to arbitration and the only issue before the arbitrator will be whether Employee was in fact terminated for Cause. If the arbitrator determines that Employee was not terminated for Cause by the Company, then the only remedies that the arbitrator may award are the payments and benefits provided under Paragraph 8 or Paragraph 9 whichever is applicable and reasonable legal fees. If the arbitrator finds that Employee was terminated for Cause, the arbitrator will be without authority to award Employee anything, and the parties will each be responsible for their own attorneys’ fees, and they will divide the costs of arbitration equally. Furthermore, should a dispute occur concerning Employee’s mental or physical capacity as described in Subparagraph 8(c), a doctor selected by Employee and a doctor selected by the Company shall be entitled to examine Employee. If the opinion of the Company’s doctor and Employee’s doctor conflict, the Company’s doctor and Employee’s doctor shall together agree upon a third doctor, whose opinion shall be binding. This Paragraph 17 shall survive the termination of this Agreement.

18.     Litigation and Regulatory Cooperation. During and after Employee’s employment, Employee shall reasonably cooperate with the Company in the defense or prosecution of any claims or actions now in existence or which may be brought in the future against or on behalf of the Company which relate to events or occurrences that transpired while Employee was employed by the Company; provided that such cooperation shall not materially and adversely affect Employee or expose Employee to an increased probability of civil or criminal litigation. Employee’s cooperation in connection with such claims or actions shall include, without limitation, being available to meet with counsel to prepare for discovery or trial and to act as a witness on behalf of the Company at mutually convenient times. During and after

13

Employee’s employment, Employee also shall cooperate fully with the Company in connection with any investigation or review of any federal, state or local regulatory authority as any such investigation or review relates to events or occurrences that transpired while Employee was employed by the Company. The Company shall also provide Employee with compensation on an hourly basis calculated at his final base compensation rate for requested litigation and regulatory cooperation that occurs after his termination of employment, and reimburse Employee for all costs and expenses incurred in connection with his performance under this Paragraph 18, including, without limitation, reasonable attorneys’ fees and costs.

19.     Severability. If any provision of this Agreement shall to any extent be held void or unenforceable (as to duration, scope, activity, subject or otherwise) by a court of competent jurisdiction, such provision shall be deemed to be modified so as to constitute a provision conforming as nearly as possible to the original provision while still remaining valid and enforceable. In such event, the remainder of this Agreement (or the application of such provision to persons or circumstances other than those in respect of which it is deemed to be void or unenforceable) shall not be affected thereby. Each other provision of this Agreement, unless specifically conditioned on the voided aspect of such provision, shall remain valid and enforceable to the fullest extent permitted by law; any other provisions of this Agreement that are specifically conditioned on the voided aspect of such invalid provision shall also be deemed to be modified so as to constitute a provision conforming as nearly as possible to the original provision while still remaining valid and enforceable to the fullest extent permitted by law.

20.     Governing Law. This Agreement shall be construed and regulated in all respects under the laws of the State of Delaware without reference to principles of conflict of laws.

21.     Section 409A.

(a)     Anything in this Agreement to the contrary notwithstanding, if at the time of Employee’s separation from service within the meaning of Section 409A of the Code, the Company determines that Employee is a “specified employee” within the meaning of Section 409A(a)(2)(B)(i) of the Code, then to the extent any payment or benefit that Employee becomes entitled to under this Agreement on account of Employee’s separation from service would be considered “non-qualified deferred compensation” otherwise subject to the 20 percent additional tax imposed pursuant to Section 409A(a) of the Code as a result of the application of Section 409A(a)(2)(B)(i) of the Code, such payment shall not be payable and such benefit shall not be provided until the date that is the earlier of (A) six months and one day after Employee’s separation from service, or (B) Employee’s death. If any such delayed cash payment is otherwise payable on an installment basis, the first payment shall include a catch-up payment covering amounts that would otherwise have been paid during the six-month period but for the application of this provision, and the balance of the installments shall be payable in accordance with their original schedule.

(b)     All in-kind benefits provided and expenses eligible for reimbursement under this Agreement shall be provided by the Company or incurred by Employee during the time periods set forth in this Agreement. All reimbursements shall be paid as soon as administratively practicable, but in no event shall any reimbursement be paid after the last day of the taxable year following the taxable year in which the expense was incurred. The amount of

14

in-kind benefits provided or reimbursable expenses incurred in one taxable year shall not affect the in-kind benefits to be provided or the expenses eligible for reimbursement in any other taxable year (except for any lifetime or other aggregate limitation applicable to medical expenses). Such right to reimbursement or in-kind benefits is not subject to liquidation or exchange for another benefit.

(c)     To the extent that any payment or benefit described in this Agreement constitutes “non-qualified deferred compensation” under Section 409A of the Code, and to the extent that such payment or benefit is payable upon Employee’s termination of employment, then such payments or benefits shall be payable only upon Employee’s “separation from service.” The determination of whether and when a separation from service has occurred shall be made in accordance with the presumptions set forth in Treasury Regulation Section 1.409A-1(h).

(d)     The parties intend that this Agreement will be administered in accordance with Section 409A of the Code. To the extent that any provision of this Agreement is ambiguous as to its compliance with Section 409A of the Code, the provision shall be read in such a manner so that all payments hereunder comply with Section 409A of the Code. Each payment pursuant to this Agreement is intended to constitute a separate payment for purposes of Treasury Regulation Section 1.409A-2(b)(2). The parties agree that this Agreement may be amended, as reasonably requested by either party, and as may be necessary to fully comply with Section 409A of the Code and all related rules and regulations in order to preserve the payments and benefits provided hereunder without additional cost to either party.

(e)     The Company makes no representation or warranty and shall have no liability to Employee or any other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section 409A of the Code but do not satisfy an exemption from, or the conditions of, such Section.

22.     Counterparts. This Agreement may be executed in any number of counterparts, each of which when so executed and delivered shall be taken to be an original; but such counterparts shall together constitute one and the same document.

15

IN WITNESS WHEREOF, this Agreement is entered into as of the date and year first above written.

BOSTON PROPERTIES, INC.
By:	/s/ Owen D. Thomas
	Owen D. Thomas
	Chief Executive Officer
By:	/s/ John F. Powers
	John F. Powers

16

EX-10.48

Exhibit 10.48

THIRD AMENDMENT

TO

BOSTON PROPERTIES, INC.

SENIOR EXECUTIVE SEVERANCE PLAN

A. The Boston Properties, Inc. Senior Executive Severance Plan, as adopted as of July 30, 1998 (the “Plan”), as subsequently amended, is further amended as follows.

1. Section 5(a) of the Plan is hereby amended by adding the following new paragraph to the end of such Section:

“Notwithstanding the foregoing, no Covered Employee who becomes eligible to participate in this Plan on or after January 1, 2014 (a “Subsequent Covered Employee”) shall be entitled to a Gross-Up Payment. In the event that Severance Payments payable to a Subsequent Covered Employee would be subject to the Excise Tax, the following provisions shall apply:

(i) If the Severance Payments, reduced by the sum of (1) the Excise Tax and (2) the total Federal, state, and local income and employment taxes payable by the Subsequent Covered Employee on the amount of the Severance Payments that are in excess of the Threshold Amount (as defined below), are greater than or equal to the Threshold Amount, the Subsequent Covered Employee shall be entitled to the full benefits payable under this Plan.

(ii) If the Threshold Amount is less than (x) the Severance Payments, but greater than (y) the Severance Payments reduced by the sum of (1) the Excise Tax and (2) the total Federal, state, and local income and employment taxes on the amount of the Severance Payments that are in excess of the Threshold Amount, then the benefits payable under this Plan shall be reduced to the extent necessary (but not below zero) so that the maximum Severance Payments shall not exceed the Threshold Amount. In such event, the Severance Payments shall be reduced in the following order: (1) cash payments not subject to Section 409A of the Code; (2) cash payments subject to Section 409A of the Code; (3) equity-based payments; and (4) non-cash form of benefits. To the extent any payment is to be made over time (e.g., in installments), then the payments shall be reduced in reverse chronological order.

For purposes of this Section 5, “Threshold Amount” shall mean three times the Subsequent Covered Employee’s “base amount” within the meaning of Section 280G(b)(3) of the Code and the regulations promulgated thereunder less one dollar ($1.00).

2. The first sentence of Section 5(b) of the Plan is hereby amended by deleting such sentence in its entirety and replacing it with the following:

“Subject to the provisions of Section 5(c), all determinations required to be made under Section 5(a), shall be made by PricewaterhouseCoopers LLP or any other nationally recognized accounting firm selected by the Employers (the “Accounting Firm”), which shall provide detailed supporting calculations both to the Employers and the Covered Employee within 15 business days of the Date of Termination, if applicable, or at such earlier time as is reasonably requested by the Employers or the Covered Employee.”

B. Except as amended hereby, the Plan shall remain in full force and effect.

IN WITNESS WHEREOF, this Third Amendment has been executed on behalf of the Company by its duly authorized officer this 8th day of January, 2014.

BOSTON PROPERTIES, INC.
By:	/s/ Eric Kevorkian
	Name:	Eric Kevorkian
	Title:	Senior Vice President, Senior Corporate Counsel and Assistant Secretary

2

EX-10.51

Exhibit 10.51

SECOND AMENDMENT

TO

BOSTON PROPERTIES, INC.

EXECUTIVE SEVERANCE PLAN

A. The Boston Properties, Inc. Senior Executive Severance Plan, as adopted as of July 30, 1998 (the “Plan”), as subsequently amended, is further amended as follows.

1. Section 5(a) of the Plan is hereby amended by adding the following new paragraph to the end of such Section:

“Notwithstanding the foregoing, no Covered Employee who becomes eligible to participate in this Plan on or after January 1, 2014 (a “Subsequent Covered Employee”) shall be entitled to a Gross-Up Payment. In the event that Severance Payments payable to a Subsequent Covered Employee would be subject to the Excise Tax, the following provisions shall apply:

(i) If the Severance Payments, reduced by the sum of (1) the Excise Tax and (2) the total Federal, state, and local income and employment taxes payable by the Subsequent Covered Employee on the amount of the Severance Payments that are in excess of the Threshold Amount (as defined below), are greater than or equal to the Threshold Amount, the Subsequent Covered Employee shall be entitled to the full benefits payable under this Plan.

(ii) If the Threshold Amount is less than (x) the Severance Payments, but greater than (y) the Severance Payments reduced by the sum of (1) the Excise Tax and (2) the total Federal, state, and local income and employment taxes on the amount of the Severance Payments that are in excess of the Threshold Amount, then the benefits payable under this Plan shall be reduced to the extent necessary (but not below zero) so that the maximum Severance Payments shall not exceed the Threshold Amount. In such event, the Severance Payments shall be reduced in the following order: (1) cash payments not subject to Section 409A of the Code; (2) cash payments subject to Section 409A of the Code; (3) equity-based payments; and (4) non-cash form of benefits. To the extent any payment is to be made over time (e.g., in installments), then the payments shall be reduced in reverse chronological order.

For purposes of this Section 5, “Threshold Amount” shall mean three times the Subsequent Covered Employee’s “base amount” within the meaning of Section 280G(b)(3) of the Code and the regulations promulgated thereunder less one dollar ($1.00).

2. The first sentence of Section 5(b) of the Plan is hereby amended by deleting such sentence in its entirety and replacing it with the following:

“Subject to the provisions of Section 5(c), all determinations required to be made under Section 5(a), shall be made by PricewaterhouseCoopers LLP or any other nationally recognized accounting firm selected by the Employers (the “Accounting Firm”), which shall provide detailed supporting calculations both to the Employers and the Covered Employee within 15 business days of the Date of Termination, if applicable, or at such earlier time as is reasonably requested by the Employers or the Covered Employee.”

B. Except as amended hereby, the Plan shall remain in full force and effect.

IN WITNESS WHEREOF, this Second Amendment has been executed on behalf of the Company by its duly authorized officer this 8th day of January, 2014.

BOSTON PROPERTIES, INC.
By:	/s/ Eric Kevorkian
	Name:	Eric Kevorkian
	Title:	Senior Vice President, Senior Corporate Counsel and Assistant Secretary

2

EX-12.1

EXHIBIT 12.1

BOSTON PROPERTIES, INC.

CALCULATION OF RATIOS OF EARNINGS TO FIXED CHARGES

CALCULATION OF RATIOS OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDENDS

Boston Properties, Inc.’s ratios of earnings to fixed charges and ratios of earnings to combined fixed charges and preferred dividends for the five years ended December 31, 2013 were as follows:

	Year Ended December 31,
	2013			2012			2011			2010			2009
	(Dollars in thousands)
Earnings:
Add:
Income from continuing operations before income from unconsolidated joint ventures and gains on consolidation of joint ventures	$	242,583		$	236,378		$	217,054		$	140,698		$	246,723
Gains on sales of real estate		—			—			—			2,734			11,760
Amortization of interest capitalized		5,522			5,278			4,188			2,660			2,498
Distributions from unconsolidated joint ventures		17,600			20,565			22,451			10,733			6,676
Fixed charges (see below)		528,116			469,083			449,972			423,224			376,059
Subtract:
Interest capitalized		(68,152	)		(44,278	)		(48,178	)		(40,981	)		(48,816	)
Preferred distributions of consolidated subsidiaries		(6,046	)		(3,497	)		(3,339	)		(3,343	)		(3,594	)
Noncontrolling interest in income of a subsidiary that has not incurred fixed charges		(5,818	)		—			—			—			—
Total earnings	$	713,805		$	683,529		$	642,148		$	535,725		$	591,306
Fixed charges:
Interest expensed	$	447,240		$	413,564		$	394,131		$	378,079		$	322,833
Interest capitalized		68,152			44,278			48,178			40,981			48,816
Portion of rental expense representative of the interest factor		6,678			7,744			4,324			821			816
Preferred distributions of consolidated subsidiaries		6,046			3,497			3,339			3,343			3,594
Total fixed charges	$	528,116		$	469,083		$	449,972		$	423,224		$	376,059
Preferred dividends		8,057			—			—			—			—
Total combined fixed charges and preferred dividends	$	536,173		$	469,083		$	449,972		$	423,224		$	376,059
Ratio of earnings to fixed charges		1.35			1.46			1.43			1.27			1.57
Ratio of earnings to combined fixed charges and preferred dividends		1.33			1.46			1.43			1.27			1.57

EX-21.1

Exhibit 21.1

Entity Name	State of Organization
101 Carnegie Center Associates		New Jersey
125 West 55th Street Venture Liquidating Trust		Delaware
17M Associates		District of Columbia
191 Spring Street Trust		Massachusetts
2 GCT Partners LLC		Delaware
2 GCT Venture LLC		Delaware
206 Associates Limited Partnership		New Jersey
210 Associates Limited Partnership		New Jersey
211 Associates Limited Partnership		New Jersey
30 Shattuck Road LLC		Delaware
399 Services LLC		Delaware
40-46 Harvard Street Trust		Massachusetts
500 North Capitol LLC		Delaware
500 North Capitol Venture LLC		Delaware
540 Land Partners LLC		Delaware
540 Madison Partners LLC		Delaware
540 Madison Venture LLC		Delaware
635 Mass Ave LLC		Delaware
738 Eighth Avenue LLC		Delaware
767 Fifth Junior Mezz LLC		Delaware
767 Fifth Lender LLC		Delaware
767 Fifth Partners LLC		Delaware
767 Fifth Senior Mezz LLC		Delaware
767 Fifth TRS LLC		Delaware
767 Venture, LLC		Delaware
90 Church Street Limited Partnership		Delaware
901 New York Avenue Fitness Center LLC		Delaware
901 New York LLC		Delaware
901 New York REIT LLC		Delaware
91 Hartwell Avenue Trust		Massachusetts
92 Hayden Avenue Trust		Massachusetts
AJ Lot 2R Financing LLC		Delaware
AJ Lot 2R LLC		Delaware
AJ Lot 3R Financing LLC		Delaware
AJ Lot 3R LLC		Delaware
AJ Lot 4R Financing LLC		Delaware
AJ Lot 4R LLC		Delaware
AJ Lot 6 Financing LLC		Delaware
AJ Lot 6 LLC		Delaware
AJ Lot 7R LLC		Delaware
Annapolis Junction NFM LLC		Delaware
Big Apple Associates Limited Partnership		Delaware
Block 4 LLC		Delaware
Boston Properties Limited Partnership		Delaware
Boston Properties LLC		Delaware
Boston Properties Management LLC		Delaware
Boston Properties Management, Inc.		Delaware
Boston Properties TRS, Inc.		Delaware
BP 103 Fourth Avenue LLC		Delaware
BP 111 Huntington Ave LLC		Delaware

Entity Name	State of Organization
BP 125 West 55th Street LLC		Delaware
BP 1330 Connecticut Avenue LLC		Delaware
BP 1333 New Hampshire Avenue LLC		Delaware
BP 140 Kendrick Street Cafe LLC		Delaware
BP 140 Kendrick Street LLC		Delaware
BP 140 Kendrick Street Property LLC		Delaware
BP 2 GCT LLC		Delaware
BP 20 F Street Limited Partnership		Delaware
BP 201 Spring Street LLC		Delaware
BP 230 City Point Cafe LLC		Delaware
BP 303 Almaden Associates LLC		Delaware
BP 399 Park Avenue LLC		Delaware
BP 500 North Capitol LLC		Delaware
BP 510 Madison Ave LLC		Delaware
BP 510 Madison HC LLC		Delaware
BP 510 Madison LLC		Delaware
BP 540 Madison LLC		Delaware
BP 599 Lexington Avenue LLC		Delaware
BP 767 Fifth LLC		Delaware
BP 888 Boylston LLC		Delaware
BP 99 Third Avenue LLC		Delaware
BP Almaden Associates LLC		Delaware
BP Atlantic Wharf Master Tenant LLC		Delaware
BP AW Garage LLC		Delaware
BP AW Retail LLC		Delaware
BP AW Tower Office LLC		Delaware
BP AW Waterfront Office LLC		Delaware
BP AWRR Trustee I LLC		Delaware
BP AWRR Trustee II LLC		Delaware
BP AWTO Trustee I LLC		Delaware
BP AWTO Trustee II LLC		Delaware
BP AWTO Trustee III LLC		Delaware
BP Bay Colony Cafe LLC		Delaware
BP Bay Colony HC LLC		Delaware
BP Bay Colony Holdings LLC		Delaware
BP Bay Colony LLC		Delaware
BP Bedford Street Cafe LLC		Delaware
BP Belvidere LLC		Delaware
BP Cambridge Center Residential LLC		Delaware
BP Crane Meadow, L.L.C.		Delaware
BP East Garage LLC		Delaware
BP EC1 Holdings LLC		Delaware
BP EC2 Holdings LLC		Delaware
BP EC3 Holdings LLC		Delaware
BP EC4 Holdings LLC		Delaware
BP Federal Street LLC		Delaware
BP Five CC LLC		Delaware
BP Four CC LLC		Delaware
BP Fourth Avenue Cafe LLC		Delaware
BP Fourth Avenue, LLC		Delaware
BP Hancock LLC		Delaware
BP Hancock Parking LLC		Delaware

Entity Name	State of Organization
BP Hartwell Avenue Cafe LLC		Delaware
BP Hayden Avenue Cafe LLC		Delaware
BP Hotel LLC		Delaware
BP II LLC		Delaware
BP III LLC		Delaware
BP Jones Road Cafe LLC		Delaware
BP Kingstowne Office Building K LLC		Delaware
BP Kingstowne Office Building T LLC		Delaware
BP Kingstowne Theatre LLC		Delaware
BP LOP LLC		Delaware
BP Mall Road Cafe LLC		Delaware
BP Management Sub LLC		Delaware
BP Management, L.P.		Delaware
BP Market Square North GP LLC		Delaware
BP Mill Road Cafe LLC		Delaware
BP New Dominion Technology Park II LLC		Delaware
BP New York LLC		Delaware
BP Prospect Place LLC		Delaware
BP Prucenter Acquisition LLC		Delaware
BP Prucenter Development LLC		Delaware
BP Prucenter Exeter LLC		Delaware
BP Prucenter Fairfield LLC		Delaware
BP RB Developer LLC		Delaware
BP Realty New Jersey LLC		New Jersey
BP Realty Washington LLC		Delaware
BP Reservoir Place Cafe LLC		Delaware
BP Reservoir Place LLC		Delaware
BP Reston Eastgate LLC		Delaware
BP RTC Member LLC		Delaware
BP Russia Building LLC		Delaware
BP Russia Wharf LLC		Delaware
BP Services TRS LLC		Delaware
BP Seven Cambridge Center LLC		Delaware
BP Seventeen Cambridge Center LLC		Delaware
BP Spring Street Cafe LLC		Delaware
BP Supermarket LLC		Delaware
BP Third Avenue LLC		Delaware
BP Times Square Tower Mezzanine LLC		Delaware
BP West Street Cafe LLC		Delaware
BP Weston Quarry LLC		Delaware
BP/CGCenter I LLC		Delaware
BP/CGCenter II LLC		Delaware
BP/CGCenter MM LLC		Delaware
BP/CRF 901 New York Avenue LLC		Delaware
BP/CRF Metropolitan Square LLC		Delaware
BP/DC 767 Fifth LLC		Delaware
BP/DC Properties, Inc.		Maryland
BP/DC REIT LLC		Delaware
BP-AJ LLC		Delaware
BPI EC4 LLC		Delaware
BPNS Garage General LLC		Delaware
BPNS Garage Limited LLC		Delaware

Entity Name	State of Organization
BPNS Hotel General LLC		Delaware
BPNS Hotel Limited LLC		Delaware
BPNS Office General LLC		Delaware
BPNS Office Limited LLC		Delaware
BPNS Podium General LLC		Delaware
BPNS Podium Limited LLC		Delaware
BPNS Residential General LLC		Delaware
BPNS Residential Limited LLC		Delaware
BP-WP Project Developer Manager LLC		Delaware
BXP 601 & 651 Gateway Center LP		Delaware
BXP 611 Gateway Center LP		Delaware
BXP California GP LLC		Delaware
BXP Folsom Holding LLC		Delaware
BXP Folsom-Hawthorne LLC		Delaware
BXP Mission 535 LLC		Delaware
BXP North First LP		Delaware
BXP Ravendale LP		Delaware
BXP Research Park LP		Delaware
BXP TB Development LLC		Delaware
BXP Technology Park LP		Delaware
BXP Transbay Management LLC		Delaware
BXP West El Camino LP		Delaware
BXP Zanker Road LP		Delaware
Cambridge Center North Trust		Massachusetts
Cambridge Center West Garage LLC		Delaware
Cambridge Center West Trust		Massachusetts
Carnegie 214 Associates Limited Partnership		New Jersey
Carnegie 504 Associates		New Jersey
Carnegie 506 Associates		New Jersey
Carnegie 508 Associates		New Jersey
Carnegie 510 Associates, L.L.C.		Delaware
Carnegie 804 Associates, LLC		Delaware
Carnegie Center Associates		New Jersey
CRF Met Square, LLC		Delaware
Discovery Square, L.L.C.		Delaware
Downtown Boston Properties Trust		Massachusetts
Elandzee Trust		Massachusetts
Eleven Cambridge Center Trust		Massachusetts
Embarcadero Center Associates		California
Embarcadero Center, Inc.		California
Four Embarcadero Center Venture		California
Fourteen Cambridge Center Trust		Massachusetts
Gateway Center LLC		Delaware
Gladden Properties LLC		Delaware
Hayden Office Trust		Massachusetts
IXP, LLC		Vermont
Jones Road Development Associates LLC		Delaware
KEG Associates I, LLC		Delaware
Lexreal Associates Limited Partnership		New York
LKE BP Fourth Avenue Limited Partnership		Massachusetts
Mall Road Trust		Massachusetts
Market Square North Associates Limited Partnership		Delaware

Entity Name	State of Organization
Market Square North Fitness Center LLC		Delaware
MBZ-Lex Trust		Massachusetts
Metropolitan Square REIT LLC		Delaware
MGA Virginia 85-1 Limited Partnership		Virginia
MGA Virginia 86-1 Limited Partnership		Virginia
MGA Virginia 86-2 Limited Partnership		Virginia
Montgomery Village Avenue Joint Venture Limited Partnership		Maryland
Montgomery Village GP LLC		Delaware
Montvale LLC		Maryland
New Dominion Technology Corp.		Delaware
New Dominion Technology Park II LLC		Delaware
New Dominion Technology Park LLC		Delaware
No. 1 Times Square Development LLC		Delaware
No. 5 Times Square Development LLC		Delaware
NY 510 Junior Mezz Lender LLC		Delaware
NYXP, LLC		Vermont
Ocean View Development Company Limited Partnership		District of Columbia
One Cambridge Center Trust		Massachusetts
One Embarcadero Center Venture		California
One Freedom Square, L.L.C.		Delaware
Princeton 202 Associates Limited Partnership		New Jersey
Princeton Childcare Associates Limited Partnership		New Jersey
RBP 45th Associates LLC		New York
RBP Joint Venture LLC		New York
Reston Corporate Center Limited Partnership		Virginia
Reston Streets LLC		Delaware
Reston Town Center JV LLC		Delaware
Reston Town Center Office Park Phase One Limited Partnership		Virginia
Reston Town Center Property LLC		Delaware
Reston VA 939, L.L.C.		Delaware
RTC Gift Card LLC		Delaware
Russia Building TRS LLC		Delaware
School Street Associates Limited Partnership		District of Columbia
SCV Partners		New Jersey
South of Market Garage LLC		Delaware
South of Market LLC		Delaware
South of Market Lot 16 LLC		Delaware
Springfield 6601 LLC		Delaware
Springfield Metro Center II, LLC		Delaware
Springfield Parcel C LLC		Delaware
Square 36 Office Joint Venture		District of Columbia
Square 407 Limited Partnership		District of Columbia
Square 54 Office Fitness TRS LLC		Delaware
Square 54 Office Owner LLC		Delaware
Square 54 Residential Owner LLC		Delaware
Stony Brook Associates LLC		Delaware
Ten Cambridge Center Trust		Massachusetts
The Atlantic Monthly Trust		Massachusetts
The Double B Partnership		Massachusetts
The Double B Trust		Massachusetts
The Metropolitan Square Associates LLC		District of Columbia
Three Cambridge Center Trust		Massachusetts

Entity Name	State of Organization
Three Embarcadero Center Venture		California
Times Square Tower Associates LLC		Delaware
Tower Oaks Financing LLC		Delaware
Tracer Lane Trust II		Massachusetts
Transbay Tower Holdings LLC		Delaware
Transbay Tower LLC		Delaware
Two Cambridge Center Trust		Massachusetts
Two Freedom Square, L.L.C.		Delaware
Washingtonian North Associates Limited Partnership		Maryland
Wisconsin Place Office LLC		Delaware
Wisconsin Place Office Manager LLC		Delaware
WP Project Developer LLC		Delaware
WP Trust		Massachusetts
Zee Bee Trust II		Massachusetts
Zee Em Trust II		Massachusetts

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (File Numbers 333-141257, 333-135190, 333-135189, 333-135187, 333-101255, 333-92402, 333-36142, 333-39114, 333-40618, 333-51024, 333-58694, 333-60219, 333-61799, 333-64902, 333-68379, 333-70765, 333-80513, 333-82498, 333-83859, 333-83861, 333-83863, 333-83867, 333-83869, 333-86585, 333-91425, 333-176157 and 333-176158) and on Form S-8 (File Numbers 333-52845, 333-54550, 333-70321, 333-81824 and 333-181483) of Boston Properties, Inc. of our report dated February 28, 2014 relating to the financial statements, financial statement schedule, and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Boston, MA

February 28, 2014

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Owen D. Thomas, certify that:

1. I have reviewed this Annual Report on Form 10-K of Boston Properties, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 28, 2014

/s/    OWEN D. THOMAS

Owen D. Thomas

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Michael E. LaBelle, certify that:

1. I have reviewed this Annual Report on Form 10-K of Boston Properties, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 28, 2014

/s/    MICHAEL E. LABELLE

Michael E. LaBelle

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc. (the “Company”) hereby certifies to his knowledge that the Company’s Annual Report on Form 10-K for the period ended December 31, 2013 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: February 28, 2014

/s/    OWEN D. THOMAS

Owen D. Thomas

Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc. (the “Company”) hereby certifies to his knowledge that the Company’s Annual Report on Form 10-K for the period ended December 31, 2013 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: February 28, 2014

/s/    MICHAEL E. LABELLE

Michael E. LaBelle

Chief Financial Officer

XML

Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Schedule Of Segment Information By Geographic Area And Property Type

Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2013:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	665,991		$	662,888		$	62,678		$	214,755		$	381,359		$	1,987,671
Office/Technical	22,617			—			—			17,259			15,649			55,525
Residential	4,395			—			—			—			17,923			22,318
Hotel	40,330			—			—			—			—			40,330
Total	733,333			662,888			62,678			232,014			414,931			2,105,844
% of Grand Totals	34.82		%	31.48		%	2.98		%	11.02		%	19.70		%	100.00		%
Rental Expenses:
Class A Office	259,997			223,265			28,375			77,905			126,507			716,049
Office/Technical	6,879			—			—			3,708			4,190			14,777
Residential	1,823			—			—			—			10,307			12,130
Hotel	28,447			—			—			—			—			28,447
Total	297,146			223,265			28,375			81,613			141,004			771,403
% of Grand Totals	38.52		%	28.94		%	3.68		%	10.58		%	18.28		%	100.00		%
Net operating income	$	436,187		$	439,623		$	34,303		$	150,401		$	273,927		$	1,334,441
% of Grand Totals	32.69		%	32.94		%	2.57		%	11.27		%	20.53		%	100.00		%

For the year ended December 31, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	617,652		$	481,844		$	61,350		$	208,177		$	346,402		$	1,715,425
Office/Technical	22,460			—			—			494			16,264			39,218
Residential	3,936			—			—			—			16,632			20,568
Hotel	37,915			—			—			—			—			37,915
Total	681,963			481,844			61,350			208,671			379,298			1,813,126
% of Grand Totals	37.61		%	26.58		%	3.38		%	11.51		%	20.92		%	100.00		%
Rental Expenses:
Class A Office	242,904			160,386			27,601			75,542			111,049			617,482
Office/Technical	6,499			—			—			149			3,966			10,614
Residential	1,675			—			—			—			9,317			10,992
Hotel	28,120			—			—			—			—			28,120
Total	279,198			160,386			27,601			75,691			124,332			667,208
% of Grand Totals	41.85		%	24.04		%	4.14		%	11.34		%	18.63		%	100.00		%
Net operating income	$	402,765		$	321,458		$	33,749		$	132,980		$	254,966		$	1,145,918
% of Grand Totals	35.15		%	28.05		%	2.95		%	11.60		%	22.25		%	100.00		%

For the year ended December 31, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	537,743		$	458,791		$	62,648		$	207,003		$	340,470		$	1,606,655
Office/Technical	25,349			—			—			—			16,236			41,585
Residential	985			—			—			—			5,632			6,617
Hotel	34,529			—			—			—			—			34,529
Total	598,606			458,791			62,648			207,003			362,338			1,689,386
% of Grand Totals	35.43		%	27.16		%	3.71		%	12.25		%	21.45		%	100.00		%
Rental Expenses:
Class A Office	206,469			152,649			28,620			72,122			95,804			555,664
Office/Technical	7,245			—			—			—			4,280			11,525
Residential	521			—			—			—			4,958			5,479
Hotel	26,128			—			—			—			—			26,128
Total	240,363			152,649			28,620			72,122			105,042			598,796
% of Grand Totals	40.14		%	25.49		%	4.78		%	12.05		%	17.54		%	100.00		%
Net operating income	$	358,243		$	306,142		$	34,028		$	134,881		$	257,296		$	1,090,590
% of Grand Totals	32.85		%	28.07		%	3.12		%	12.37		%	23.59		%	100.00		%

Schedule Of Reconciliation Of Net Operating Income To Net Income

The following is a reconciliation of Net Operating Income to net income attributable to Boston Properties, Inc.:

	Year ended December 31,
		2013		2012			2011
Net Operating Income		$	1,334,441	$	1,145,918		$	1,090,590
Add:
Development and management services income		29,695		34,060			33,406
Income from unconsolidated joint ventures		75,074		49,078			85,896
Gains on consolidation of joint ventures		385,991		—			—
Interest and other income		8,310		10,091			5,358
Gains (losses) from investments in securities		2,911		1,389			(443		)
Gains (losses) from early extinguishments of debt		122		(4,453		)	(1,494		)
Income from discontinued operations		8,022		9,806			10,876
Gains on sales of real estate from discontinued operations		112,829		36,877			—
Gain on forgiveness of debt from discontinued operations		20,182		—			—
Less:
General and administrative expense		115,329		90,129			87,101
Transaction costs		1,744		3,653			1,987
Depreciation and amortization expense		560,637		445,875			429,742
Interest expense		446,880		410,970			391,533
Impairment loss		8,306		—			—
Impairment loss from discontinued operations		3,241		—			—
Noncontrolling interest in property partnerships		1,347		3,792			1,558
Noncontrolling interest—redeemable preferred units of the Operating Partnership		6,046		3,497			3,339
Noncontrolling interest—common units of the Operating Partnership		70,085		30,125			35,007
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		14,151		5,075			1,243
Net income attributable to Boston Properties, Inc.		$	749,811	$	289,650		$	272,679

XML

Real Estate (Summary Of The Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	$ 576,199	$ 571,481	$ 510,033	$ 477,826	$ 478,047	$ 464,220	$ 466,197	$ 438,722	$ 2,135,539	$ 1,847,186	$ 1,722,792
Expenses
Depreciation and amortization									560,637	445,875	429,742
Total expenses									1,457,419	1,206,865	1,117,626
Operating income									678,120	640,321	605,166
Other Expenses
Interest expense									446,880	410,970	391,533
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership									(14,151)	(5,075)	(1,243)
Income from discontinued operations attributable to Boston Properties, Inc.									123,641	41,608	9,633
Gain on sale of real estate from discontinued operations									112,829	36,877	0
Gain on forgiveness of debt from discontinued operations									20,182	0	0
Impairment loss from discontinued operations									(3,241)	0	0
10 & 20 Burlington Mall Road, One Preserve Parkway, 1301 New York Avenue, 303 Almaden Blvd, Montvale Center and Bedford Business Park [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue									20,138	32,607	36,734
Expenses
Operating									6,996	12,038	13,818
Depreciation and amortization									4,760	8,169	9,442
Total expenses									11,756	20,207	23,260
Operating income									8,382	12,400	13,474
Other Expenses
Interest expense									360	2,594	2,598
Income from discontinued operations									8,022	9,806	10,876
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership									(803)	(1,031)	(1,243)
Income from discontinued operations attributable to Boston Properties, Inc.									7,219	8,775	9,633
Gain on sale of real estate from discontinued operations									112,829	36,877	0
Gain on forgiveness of debt from discontinued operations									20,182	0	0
Impairment loss from discontinued operations									(3,241)	0	0
Noncontrolling interest in gain on sale of real estate, gain on forgiveness of debt and impairment loss from discontinued operations - common units of the Operating Partnership									(13,348)	(4,044)	0
Gain on sale of real estate, gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc									$ 116,422	$ 32,833

XML

Summary Of Significant Accounting Policies Schedule Of Future Contractual Minimum Lease Payments Under Non-Cancelable Ground Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]
2014	$ 13,184
2015	13,507
2016	13,732
2017	13,963
2018	14,198
Thereafter	$ 899,187

XML

Noncontrolling Interests (Narrative) (Details)	Dec. 31, 2013
Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Operating Partnership (OP) Units (in shares)	15,583,370
Long-Term Incentive Plan (LTIP) Units (in shares)	1,455,761
Series Two Preferred Units (in shares)	666,116
Convertible Operating Partnership (OP) Units (in shares)	874,168
Series Four Preferred Units (in shares)	360,126
OPP Units 2011 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units (in shares)	396,500
OPP Units 2012 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units (in shares)	396,150
MYLTIP 2013 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units (in shares)	316,325
Series Two Preferred Units [Member] | Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Series Two Preferred Units (in shares)	666,116

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Real Estate Schedule of Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Real Estate [Abstract]
Land	$ 4,450,532	$ 2,605,162
Land held for future development	297,376	275,094
Buildings and improvements	11,065,113	9,517,343
Tenant improvements	1,617,401	1,435,508
Furniture, fixtures and equipment	25,164	23,441
Construction in progress	1,523,179	1,036,780
Total	18,978,765	14,893,328
Less: accumulated depreciation	(3,161,571)	(2,934,160)
Total real estate	$ 15,817,194	$ 11,959,168

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Future Minimum Rents Schedule of Future Minimum Rents Payable for Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Future Minimum Rents [Abstract]
2014	$ 1,716,754
2015	1,706,282
2016	1,660,890
2017	1,510,645
2018	1,342,157
Thereafter	$ 6,674,466

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Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	$ 4,449,734		$ 3,102,485
Mezzanine notes payable	311,040		0
Unsecured senior notes	5,835,854		4,639,528
Unsecured exchangeable senior notes	744,880		1,170,356
Total	4,258,530
Impact of accounting pronouncement	2,438		25,500
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	4,449,734		3,102,485
Mezzanine notes payable	311,040		0
Unsecured senior notes	5,835,854		4,639,528
Unsecured exchangeable senior notes	744,880	[1]	1,170,356	[1]
Total	11,341,508		8,912,369
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	4,545,283		3,256,940
Mezzanine notes payable	311,064		0
Unsecured senior notes	6,050,517		5,162,486
Unsecured exchangeable senior notes	750,266		1,278,554
Total	11,657,130		9,697,980
ASC 470-20 Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impact of accounting pronouncement	$ 2,400		$ 25,500

[1] Includes the net adjustment for the equity component allocation totaling approximately $2.4 million and $25.5 million at December 31, 2013 and December 31, 2012, respectively.

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Investments in Unconsolidated Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2013

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at December 31, 2013:

Entity	Properties	Nominal % Ownership
Square 407 Limited Partnership	Market Square North	50.0	%
The Metropolitan Square Associates LLC	Metropolitan Square	51.0	%
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0	%	(1)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3	%	(2)
RBP Joint Venture LLC	N/A	50.0	%	(3)
Boston Properties Office Value-Added Fund, L.P.	N/A	39.5	%	(4)
Annapolis Junction NFM, LLC	Annapolis Junction	50.0	%	(5)
2 GCT Venture LLC	N/A	60.0	%	(6)
540 Madison Venture LLC	540 Madison Avenue	60.0	%
125 West 55th Street Venture LLC	N/A	60.0	%	(7)
500 North Capitol LLC	500 North Capitol Street, NW	30.0	%

 _______________

(1) The Company’s economic ownership can increase based on the achievement of certain return thresholds.

(2) The Company’s wholly-owned entity that owns the office component of the project also owns a 33.3% interest in the entity owning the land, parking and infrastructure of the project.

(3) Eighth Avenue and 46th Street was sold on July 19, 2013.

(4) The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013 (See Note 3). As of December 31, 2013, the investment is comprised of undistributed cash.

(5) Comprised of two buildings, one building under construction and two undeveloped land parcels.

(6) Two Grand Central Tower was sold on October 25, 2011. As of December 31, 2013, the investment is comprised of undistributed cash.

(7) 125 West 55th Street was sold on May 30, 2013. As of December 31, 2013, the investment is comprised of undistributed cash.

Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block]

The combined summarized balance sheets of the unconsolidated joint ventures are as follows:

	December 31, 2013			December 31, 2012
	(in thousands)
ASSETS
Real estate and development in process, net	$	924,297		$	4,494,971
Other assets	163,149			673,716
Total assets	$	1,087,446		$	5,168,687
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	749,732		$	3,039,922
Other liabilities	28,830			792,888
Members’/Partners’ equity	308,884			1,335,877
Total liabilities and members’/partners’ equity	$	1,087,446		$	5,168,687
Company’s share of equity	$	154,726		$	787,941
Basis differentials (1)	(28,642		)	(128,025		)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	126,084		$	659,916

 _______________

(1) This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.

Statements Of Operations Of The Joint Ventures

The combined summarized statements of operations of the joint ventures are as follows:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Total revenue (1)	$	311,548		$	564,205		$	589,294
Expenses
Operating	105,319			162,665			170,404
Depreciation and amortization	86,088			163,134			190,437
Impairment losses	—			—			40,468
Total expenses	191,407			325,799			401,309
Operating income	120,141			238,406			187,985
Other income (expense)
Interest expense	(112,535		)	(224,645		)	(228,494		)
Losses from early extinguishments of debt	(1,677		)	—			—
Income (loss) from continuing operations	5,929			13,761			(40,509		)
Gains on sales of real estate	14,207			990			—
Net income (loss)	$	20,136		$	14,751		$	(40,509	)
Company’s share of net income (loss)	$	4,612		$	6,863		$	(25,374	)
Gains on sales of real estate	54,501			—			46,166
Basis differential	(1,017		)	1,732			27,226
Elimination of inter-entity interest on partner loan	16,978			40,483			37,878
Income from unconsolidated joint ventures	$	75,074		$	49,078		$	85,896
Gains on consolidation of joint ventures	$	385,991		$	—		$	—

 _______________ 

(1) Includes straight-line rent adjustments of $7.8 million, $12.0 million and $21.9 million for the years ended December 31, 2013, 2012 and 2011, respectively. Includes net below-market rent adjustments of $33.7 million, $91.1 million and $120.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. Total revenue for the year ended December 31, 2012 includes termination income totaling approximately $19.6 million (of which the Company's share is approximately $11.8 million) related to a lease termination with a tenant at 767 Fifth Avenue (The General Motors Building).

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Future Minimum Rents Narrative (Details)	12 Months Ended
	Dec. 31, 2013 tenants	Dec. 31, 2012 tenants	Dec. 31, 2011 tenants
Future Minimum Rent [Line Items]
Number Of Tenants Above Concentration Amount.	0	0	0
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Minimum [Member]
Future Minimum Rent [Line Items]
Initial Term Lease Expiration Date	2014
Maximum [Member]
Future Minimum Rent [Line Items]
Initial Term Lease Expiration Date	2048

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Noncontrolling Interests Redeemable interest in property partnerships (narrative) (Details) (Fountain Square [Member], USD $)	0 Months Ended
	Oct. 04, 2012
Fountain Square [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Aggregate purchase price	$ 385,000,000
Debt recorded upon consolidation	211,300,000
Ownership Percentage	50.00%
Consideration paid	87,000,000
Ownership Percentage by Parent	50.00%
Future Fixed Price to Acquire Remaining Portion of Joint venture	$ 102,000,000
Fixed Price Option Expiration Date	Jan. 31, 2016

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Related Party Transactions (Details) (USD $)	12 Months Ended		12 Months Ended				0 Months Ended		12 Months Ended			76 Months Ended	110 Months Ended	186 Months Ended
	Dec. 31, 2013 nonemployeedirectors	Dec. 31, 2012	Dec. 31, 2013 New York regional manager [Member]	Dec. 31, 2013 Brother of Executive Vice President [Member]	Dec. 31, 2012 Brother of Executive Vice President [Member]	Dec. 31, 2011 Brother of Executive Vice President [Member]	Jul. 24, 2007 Former Director [Member]	Jun. 30, 1998 Former Director [Member]	Dec. 31, 2013 Former Director [Member]	Dec. 31, 2007 Former Director [Member]	Dec. 31, 2004 Former Director [Member]	Oct. 20, 2004 Affiliate of Former Director [Member]	Dec. 31, 2013 Affiliate of Former Director [Member]	Dec. 31, 2013 Affiliate of Former Director [Member] sqft Y
Related Party Transaction [Line Items]
Aggregate leasing commissions paid to related parties			$ 592,000	$ 868,000	$ 1,306,000	$ 671,000
Related Party Acquisition Date							Jul. 24, 2007	Jun. 30, 1998
Square Feet of Development														2,000,000
Purchase price per rentable square feet of property developed.														20
Target Annual Return Minimum												10.50%
Target Annual Return Maximum.												11.00%
Annual Development Agreement Payments.									125,000
Development Agreement Payment Made For 1998 Through 2004											750,000
Aggregate Fixed Rentable Per Square Foot Of Developed Property.													10.50
Adjustment To Aggregate Fixed Amount Per Square Foot Of Developed Property													5.50
Term of Development Agreement., Years														20
Number Of Non employee Directors Electing To Receive Deferred Stock Units	6
Purchase Price of Land Parcel										$ 3,100,000
Deferred Stock Units Outstanding	83,995	76,682

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Deferred Charges Schedule of Acquired In-Place Lease Intangibles (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Deferred Charges [Abstract]
2014	$ 91,903
2015	66,716
2016	55,083
2017	41,106
2018	$ 36,306

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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended					0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 26, 2013 Transbay Tower [Member] floor sqft	Feb. 26, 2013 Transbay Tower [Member]	Feb. 07, 2013 Transbay Tower [Member]	May 31, 2013 767 5th Avenue (The General Motors Building) [Member] sqft	Oct. 09, 2013 Time Square Tower [Member] sqft	May 31, 2013 767 5th Avenue (The General Motors Building) [Member] partners
Noncontrolling Interest [Line Items]
Partners Joint Venture Ownership Percentage					5.00%	50.00%	40.00%
Ownership Percentage				95.00%	95.00%
Number of floors in building				60
Net Rentable Area				1,400,000			1,800,000	1,246,000
Payments to Acquire Land				$ 192,000,000
Number of Joint Venture Partners									2
Noncontrolling interest in property partnerships recorded upon consolidation	480,861,000	0	0				480,861,000
ownership interest sold (percent)								45.00%
Net Contractual Sales Price								684,000,000
Proceeds from sale of an interest in a real estate asset								673,100,000
Portion allocation to noncontrolling interest based on carrying value of the total equity of the property prior to the sale								243,500,000
Difference between net cash proceeds received and noncontrolling interest recognized								429,600,000
Property partnerships	$ 726,132,000	$ (1,964,000)

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Stock Option and Incentive Plan (Restricted Stock) (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended			12 Months Ended							0 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 LTIP Units [Member]	Dec. 31, 2012 LTIP Units [Member]	Dec. 31, 2011 LTIP Units [Member]	Dec. 31, 2012 OPP Units Two Thousand And Eight [Member] Y	Dec. 31, 2013 LTIPs And Restricted Stock [Member] VestingInstallments	Dec. 31, 2013 LTIPs, OPP and MYLTIP Awards [Member]	Dec. 31, 2012 OPP Units 2012 [Member]	Jan. 28, 2013 MYLTIP 2013 [Member] Y	Dec. 31, 2013 MYLTIP 2013 [Member]	Dec. 31, 2013 Non Qualified Stock Options [Member]	Dec. 31, 2012 Non Qualified Stock Options [Member]	Dec. 31, 2011 Non Qualified Stock Options [Member]	Jan. 31, 2014 OPP Units 2011 [Member]	Dec. 31, 2011 OPP Units 2011 [Member]	Dec. 31, 2013 Unvested 2011 and 2012 OPP Units [Member]	Dec. 31, 2013 Non-Qualified Employee Stock Purchase Plan [Member] D	Dec. 31, 2012 Non-Qualified Employee Stock Purchase Plan [Member]	Dec. 31, 2011 Non-Qualified Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Board of Directors Chairman [Member]	Dec. 31, 2013 Executive Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	153,062,001	151,680,109			36,730	20,756	19,030
LTIP units issued (in shares)				109,718				184,733	174,650	190,067
Non-qualified stock options issued (in shares)			146,844														252,220	186,007
2012 OPP units issued (in shares)														400,000							400,000
MYLTIP units issued																318,926
Employee and director payment per share (in dollars per share)					$ 0.01								$ 0.25							$ 0.25
Vesting annual installments												4
Stock-based compensation associated with restricted stock, non-qualified options, LTIP Units, 2008 OPP Units, 2011 OPP Units, and 2012 OPP Units	$ 43,900,000	$ 28,300,000	$ 28,300,000																							$ 21,500,000	$ 2,700,000
Compensation Expense associated with Transition Agreement																										13,800,000
TRS measurement (in years)											3				3
Accelerated Compensation Expenses Related To 2008 Opp Units			4,300,000
Unrecognized compensation expenses												17,600,000										11,100,000
Weighted-average period (years)																						2 years 8 months 12 days
Value of shares of common stock	1,530,000	1,516,000			3,900,000	2,200,000	1,800,000
Employee's weighted average cost per share (in dollars per share)					$ 105.30	$ 107.31	$ 93.40
Value of LTIP units issued								17,800,000	17,300,000	16,500,000
Per unit fair value weighted-average (in dollars per share)								$ 96.13	$ 98.83	$ 86.74
Expected life assumed to calculate per unit fair value per LTIP unit (years)								5 years 8 months 12 days	5 years 9 months 19 days	5 years 9 months 19 days							6 years 0 months 0 days	5 years 4 months 24 days	6 years 0 months 0 days
Risk-free rate								1.03%	0.94%	2.22%							1.11%	0.92%	2.37%
Expected price volatility								26.00%	29.10%	30.00%							26.00%	28.40%	35.00%
Expected dividend rate																	3.00%	2.90%	3.00%
Weighted-average grant date fair value (in dollars per share)	$ 104.50	$ 107.23	$ 92.71														$ 18.46	$ 19.50	$ 24.67
Weighted-average exercise price (in dollars per share)																	$ 105.10	$ 107.23	$ 92.71
Exercisable, Weighted Average Exercise Price		$ 98.92	$ 54.32
Maximum Common Stock available for issuance																							250,000
Employee Common Stock options, percent of average closing price																							85.00%
Number Of Days Used In Calculation, Average Closing Prices Of Common Stock																							10
Shares issued																							6,442	7,406	6,356
Shares issued, weighted-average purchase price per share																							$ 89.65	$ 86.52	$ 80.13
Number Exercisable at 12/31/2010		91,496	13,633
Total intrinsic value of the outstanding and exercisable stock options	$ 800,000

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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Development and management services income									$ 29,695	$ 34,060	$ 33,406
Income from unconsolidated joint ventures									75,074	49,078	85,896
Gains on consolidation of joint ventures									385,991	0	0
Interest and other income									8,310	10,091	5,358
Gains (losses) from investments in securities									2,911	1,389	(443)
Gains (losses) from early extinguishments of debt									122	(4,453)	(1,494)
Income from discontinued operations									8,022	9,806	10,876
Gain on sale of real estate from discontinued operations									112,829	36,877	0
Gain on forgiveness of debt from discontinued operations									20,182	0	0
General and administrative expense									115,329	90,129	87,101
Transaction costs									1,744	3,653	1,987
Depreciation and amortization expense									560,637	445,875	429,742
Interest expense									446,880	410,970	391,533
Impairment loss									8,306	0	0
Impairment loss from discontinued operations									3,241	0	0
Noncontrolling interest in property partnerships									1,347	3,792	1,558
Noncontrolling interest-redeemable preferred units of the Operating Partnership									6,046	3,497	3,339
Noncontrolling interest-common units of the Operating Partnership									70,085	30,125	35,007
Noncontrolling interest in discontinued operations-common units of the Operating Partnership									14,151	5,075	1,243
Net income attributable to Boston Properties, Inc.	88,719	152,677	452,417	47,854	65,400	57,249	118,559	48,454	749,811	289,650	272,679
Business Intersegment, Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Operating Income									1,334,441	1,145,918	1,090,590
Development and management services income									29,695	34,060	33,406
Income from unconsolidated joint ventures									75,074	49,078	85,896
Gains on consolidation of joint ventures									385,991	0	0
Interest and other income									8,310	10,091	5,358
Gains (losses) from investments in securities									2,911	1,389	(443)
Gains (losses) from early extinguishments of debt									122	(4,453)	(1,494)
Income from discontinued operations									8,022	9,806	10,876
Gain on sale of real estate from discontinued operations									112,829	36,877	0
Gain on forgiveness of debt from discontinued operations									20,182	0	0
General and administrative expense									115,329	90,129	87,101
Transaction costs									1,744	3,653	1,987
Depreciation and amortization expense									560,637	445,875	429,742
Interest expense									446,880	410,970	391,533
Impairment loss									8,306	0	0
Impairment loss from discontinued operations									3,241	0	0
Noncontrolling interest in property partnerships									1,347	3,792	1,558
Noncontrolling interest-redeemable preferred units of the Operating Partnership									6,046	3,497	3,339
Noncontrolling interest-common units of the Operating Partnership									70,085	30,125	35,007
Noncontrolling interest in discontinued operations-common units of the Operating Partnership									14,151	5,075	1,243
Net income attributable to Boston Properties, Inc.									$ 749,811	$ 289,650	$ 272,679

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Stock Option and Incentive Plan Schedule of Stock Options Status (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Outstanding, Shares	294,527	155,623	324,938
Beginning Oustanding, Weighted Average Exercise Price	$ 101.06	$ 89.35	$ 32.65
Granted, Shares	252,220	186,007	146,844
Granted, Weighted Average Exercise Price	$ 104.50	$ 107.23	$ 92.71
Exercised, Shares	0	(22,823)	(316,159)
Exercised, Weighted Averge Exercise Price	$ 0.00	$ 72.42	$ 32.63
Canceled, Shares	0	(24,280)	0
Canceled, Weighted Average Exercise Price	$ 0.00	$ 100.15	$ 0
Special dividend adjustment (shares)	12,076
Special dividend adjustment weighted average exercise price	$ 100.44
Ending Outstanding, Shares	558,823	294,527	155,623
Ending Oustanding, Weighted Average Exercise Pric	$ 100.43	$ 101.06	$ 89.35

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Stockholders' Equity (Details) (USD $)	0 Months Ended					12 Months Ended					12 Months Ended						0 Months Ended			12 Months Ended					12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Mar. 27, 2013	Jan. 29, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 27, 2013	Dec. 31, 2013 Atm Program [Member]	Dec. 31, 2013 Issued in conjunction with debt exchange for 3.75% exchangeable senior notes [Member]	Dec. 31, 2013 Quarter 4 2012 [Member]	Dec. 31, 2013 Quarter 1 2013 [Member]	Dec. 31, 2013 Quarter 2 2013 [Member]	Dec. 31, 2013 Quarter 3 2013 [Member]	Dec. 31, 2013 Quarter 4 2013 [Member]	Nov. 15, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Aug. 15, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	May 15, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 27, 2018 Series B Cumulative Redeemable Preferred Stock [Member]	Nov. 27, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 27, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 2 2013 [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 3 2013 [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 4 2013 [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 1 2014 [Member]	Mar. 27, 2018 Depositary shares of Series B Cumulative Redeemable Preferred [Member]	Dec. 31, 2013 Depositary shares of Series B Cumulative Redeemable Preferred [Member]	Nov. 27, 2013 special dividend [Member]
Class of Stock [Line Items]
Ratio of depository shares to shares of Series B Preferred Stock																							0.01
Common stock, shares outstanding						152,983,101	151,601,209
At the market stock offering program, aggregate value of common stock										$ 600,000,000
At the market stock offering program remaining amount available for issuance										305,300,000
Shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees						0	22,823	316,159
Shares of its Common Stock in connection with the redemption of an equal number of OP Units						929,441	1,110,660
Dividend payable date												Jan. 29, 2013	Apr. 30, 2013	Jul. 31, 2013	Oct. 31, 2013	Jan. 29, 2014									May 15, 2013	Aug. 15, 2013	Nov. 15, 2013	Feb. 18, 2014
Dividends Payable, Amount Per Share									$ 0.65													$ 32.8125									$ 2.25
Dividend paid on common stock (in dollars per share)	$ 0.65	$ 0.65	$ 0.65		$ 0.65												$ 32.8125	$ 32.8125	$ 32.8125
Dividend shareholder of record date												Dec. 31, 2012	Mar. 29, 2013	Jun. 28, 2013	Sep. 30, 2013	Dec. 31, 2013												Feb. 07, 2014
Dividends Payable, Date Declared																Nov. 27, 2013												Nov. 27, 2013
Preferred stock, shares outstanding						0	0													80,000				0						8,000,000
Preferred Stock, Dividend Rate, Percentage																				5.25%
Series B Liquidation Preference Per Share																				$ 2,500.00	$ 2,500.00			$ 0					$ 25.00	$ 25.00
Proceeds from Issuance of Preferred Stock and Preference Stock				$ 193,600,000		$ 193,623,000	$ 0	$ 0
Stock Issued During Period, Shares, New Issues											419,116
Coupon/Stated Rate						3.625%					3.75%

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Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified				12 Months Ended											12 Months Ended		12 Months Ended						12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Noncontrolling Interests [Member]	Dec. 31, 2013 Series Two Preferred Units [Member]	Dec. 31, 2012 Series Two Preferred Units [Member]	Dec. 31, 2013 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Nov. 15, 2013 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Aug. 15, 2013 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	May 15, 2013 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Feb. 15, 2013 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Dec. 31, 2012 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Dec. 31, 2011 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Dec. 31, 2010 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Dec. 31, 2009 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Dec. 31, 2013 Series Four Preferred Units [Member]	Aug. 29, 2013 Series Four Preferred Units [Member]	Dec. 31, 2013 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Nov. 15, 2013 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Aug. 29, 2013 Series Four Preferred Units [Member] Noncontrolling Interests [Member] D	Aug. 15, 2013 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	May 15, 2013 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Feb. 15, 2013 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Dec. 31, 2013 OP Units [Member]	Dec. 31, 2012 OP Units [Member]	Dec. 31, 2013 Redemption Year Two Thousand Fourteen [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Series Two Preferred Units (in shares)			666,116			666,116
Liquidation preference percentage						6.00%
Series Four Preferred Units Redeemed																861,400
Operating Units liquidation preference (in dollars per share)						$ 38.10
OP Units for each Preferred Unit (in shares)				1.312336		1.312336
Dates Series Two Preferred holders can require Operating Partnership to redeem their units for cash																									May 12, 2014
Number of holders exercising redemption rights						0					0	0	0	0
Units converted (in shares)				329,881	117,047																		432,914	153,605
Distributions to Series Two and Four Preferred Units (in dollars per share)							$ 0.85302	$ 0.85302	$ 0.85302	$ 0.85302								$ 0.25		$ 0.25	$ 0.25	$ 0.25
Series Four Preferred Units			360,126														360,126
Series Four Preferred Units Annual Dividend Payable Rate															2.00%		2.00%
Preferred Units Liquidation Preference				$ 50.00		$ 50.00									$ 50.00	$ 50.00	$ 50.00
First opportunity to redeem Series Four Preferred Units (in days)																			30
Redeemable preferred units of the Operating Partnership	$ 51,312	$ 110,876

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Related Party Transactions

156 Months Ended

Dec. 31, 2013

Related Party Transaction [Line Items]

Related Party Transactions Disclosure [Text Block]

18.    Related Party Transactions

Prior to joining the Company effective January 2, 2014, Mr. John F. Powers provided commercial real estate brokerage services to the Company, on behalf of his prior employer, CBRE, in connection with certain leasing transactions. Mr. Powers received approximately $592,000 during the year ended December 31, 2013 in connection with these transactions. Mr. John F. Powers is a Senior Vice President of Boston Properties, Inc. and the Regional Manager of its New York office.

A firm controlled by Mr. Raymond A. Ritchey’s brother was paid aggregate leasing commissions of approximately $868,000, $1,306,000 and $671,000 for the years ended December 31, 2013, 2012 and 2011, respectively, related to certain exclusive leasing arrangements for certain Northern Virginia properties. Mr. Ritchey is an Executive Vice President of Boston Properties, Inc.

On June 30, 1998, the Company acquired from entities controlled by Mr. Alan B. Landis, a former director, a portfolio of properties known as the Carnegie Center Portfolio and Tower Center One and related operations and development rights (collectively, the “Carnegie Center Portfolio”). In connection with the acquisition of the Carnegie Center Portfolio, the Operating Partnership entered into a development agreement (the “Development Agreement”) with affiliates of Mr. Landis providing for up to approximately 2,000,000 square feet of development in or adjacent to the Carnegie Center office complex. An affiliate of Mr. Landis was entitled to a purchase price for each parcel developed under the Development Agreement calculated on the basis of $20 per rentable square foot of property developed. Another affiliate of Mr. Landis was eligible to earn a contingent payment for each developed property that achieves a stabilized return in excess of a target annual return ranging between 10.5% and 11%. The Development Agreement also provided that upon negotiated terms and conditions, the Company and Mr. Landis would form a development company to provide development services for these development projects and would share the expenses and profits, if any, of this new company. In addition, in connection with the acquisition of the Carnegie Center Portfolio, Mr. Landis became a director of the Company pursuant to an Agreement Regarding Directorship, dated as of June 30, 1998, with the Company (the “Directorship Agreement”). Under the Directorship Agreement, the Company agreed to nominate Mr. Landis for re-election as a director at each annual meeting of stockholders of the Company in a year in which his term expires, provided that specified conditions are met.

On October 21, 2004, the Company entered into an agreement (the “2004 Agreement”) to modify several provisions of the Development Agreement. Under the terms of the 2004 Agreement, the Operating Partnership and affiliates of Mr. Landis amended the Development Agreement to limit the rights of Mr. Landis and his affiliates to participate in the development of properties under the Development Agreement. Among other things, Mr. Landis agreed that (1) Mr. Landis and his affiliates will have no right to participate in any entity formed to acquire land parcels or the development company formed by the Operating Partnership to provide development services under the Development Agreement, (2) Mr. Landis will have no right or obligation to play a role in development activities engaged in by the development company formed by the Operating Partnership under the Development Agreement or receive compensation from the development company and (3) the affiliate of Mr. Landis will have no right to receive a contingent payment for developed properties based on stabilized returns. In exchange, the Company (together with the Operating Partnership) agreed to:

• effective as of June 30, 1998, pay Mr. Landis $125,000 on January 1 of each year until the earlier of (A) January 1, 2018, (B) the termination of the Development Agreement or (C) the date on which all development properties under the Development Agreement have been conveyed pursuant to the Development Agreement, with $750,000, representing payments of this annual amount from 1998 to 2004, being paid upon execution of the 2004 Agreement; and

• pay an affiliate of Mr. Landis, in connection with the development of land parcels acquired under the Development Agreement, an aggregate fixed amount of $10.50 per rentable square foot of property developed (with a portion of this amount (i.e., $5.50) being subject to adjustment, in specified circumstances, based on future increases in the Consumer Price Index) in lieu of a contingent payment based on stabilized returns, which payment could have been greater or less than $10.50 per rentable square foot of property developed.

The Operating Partnership also continues to be obligated to pay an affiliate of Mr. Landis the purchase price of $20 per rentable square foot of property developed for each land parcel acquired as provided in the original Development Agreement. During the 20-year term of the Development Agreement, until such time, if any, as the Operating Partnership elects to acquire a land parcel, an affiliate of Mr. Landis will remain responsible for all carrying costs associated with such land parcel. On July 24, 2007, the Company acquired from Mr. Landis 701 Carnegie Center, a land parcel located in Princeton, New Jersey for a purchase price of approximately $3.1 million.

In addition, in connection with entering into the 2004 Agreement, Mr. Landis resigned as a director of the Company effective as of May 11, 2005 and agreed that the Company had no future obligation to nominate Mr. Landis as a director of the Company under the Directorship Agreement or otherwise. Mr. Landis did not resign because of a disagreement with the Company on any matter relating to its operations, policies or practices. Mitchell S. Landis, the Senior Vice President and Regional Manager of the Company’s Princeton, New Jersey region, is the brother of Alan B. Landis.

In accordance with the Company’s 2012 Plan, and as approved by the Board of Directors, six non-employee directors made an election to receive deferred stock units in lieu of cash fees for 2013. The deferred stock units will be settled in shares of common stock upon the cessation of such director’s service on the Board of Directors. As a result of these elections, the aggregate cash fees otherwise payable to a non-employee director during a fiscal quarter are converted into a number of deferred stock units equal to the aggregate cash fees divided by the last reported sales price of a share of the Company’s common stock on the last trading of the applicable fiscal quarter. The deferred stock units are also credited with dividend equivalents as dividends are paid by the Company. At December 31, 2013 and 2012, the Company had outstanding 83,995 and 76,682 deferred stock units, respectively.

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Summary Of Significant Accounting Policies Schedule of Finite Lived Intangible Assets Future Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
2014	$ 91,903
2015	66,716
2016	55,083
2017	41,106
2018	36,306
Acquired Above-Market Lease Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
2014	23,669
2015	22,758
2016	20,576
2017	12,279
2018	8,637
Acquired Below-Market Lease Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
2014	61,700
2015	55,207
2016	52,461
2017	40,346
2018	$ 37,774

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Selected Interim Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	2013 Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	(in thousands, except for per share amounts)
Total revenue	$	477,826	$	510,033	$	571,481	$	576,199
Income from continuing operations	$	38,496	$	503,446	$	82,311	$	79,395
Net income attributable to Boston Properties, Inc.	$	47,854	$	452,417	$	152,677	$	88,719
Income attributable to Boston Properties, Inc. per share—basic	$	0.32	$	2.95	$	1.00	$	0.58
Income attributable to Boston Properties, Inc. per share—diluted	$	0.31	$	2.94	$	1.00	$	0.58

	2012 Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	(in thousands, except for per share amounts)
Total revenue	$	438,722	$	466,197	$	464,220	$	478,047
Income from continuing operations	$	53,079	$	94,795	$	63,331	$	74,251
Net income attributable to Boston Properties, Inc.	$	48,454	$	118,559	$	57,249	$	65,400
Income attributable to Boston Properties, Inc. per share—basic	$	0.33	$	0.79	$	0.38	$	0.43
Income attributable to Boston Properties, Inc. per share—diluted	$	0.33	$	0.78	$	0.38	$	0.43

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(Common Units) (Narrative) (Details) (USD $)		0 Months Ended				12 Months Ended							12 Months Ended
	Aug. 13, 2008	Oct. 31, 2013 OP Units [Member]	Jul. 31, 2013 OP Units [Member]	Apr. 30, 2013 OP Units [Member]	Jan. 29, 2013 OP Units [Member]	Dec. 31, 2013 OP Units [Member] Y	Dec. 31, 2012 OP Units [Member]	Nov. 27, 2013 OP Units [Member]	Dec. 31, 2013 OPP Units 2011 [Member]	Dec. 31, 2013 OPP Units 2012 [Member]	Dec. 31, 2013 MYLTIP 2013 [Member]	Dec. 31, 2013 OP Units [Member]	Dec. 31, 2013 Quarter 4 2012 [Member]	Dec. 31, 2013 Quarter 4 2012 [Member] OP Units [Member]	Dec. 31, 2013 Quarter 1 2013 [Member]	Dec. 31, 2013 Quarter 1 2013 [Member] OP Units [Member]	Dec. 31, 2013 Quarter 2 2013 [Member]	Dec. 31, 2013 Quarter 2 2013 [Member] OP Units [Member]	Dec. 31, 2013 Quarter 3 2013 [Member]	Dec. 31, 2013 Quarter 3 2013 [Member] OP Units [Member]	Dec. 31, 2013 Quarter 4 2013 [Member]	Dec. 31, 2013 Quarter 4 2013 [Member] OP Units [Member]	Nov. 27, 2013 special dividend [Member] OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Distributions Declared To OP And LTIP Units Per Unit								$ 0.65															$ 2.25
Distributions Declared To OPP Units and MYLTIP Units Per Unit								$ 0.065
OP Units for redemption (in shares)						929,441	1,110,660
Redemption of OP units issued on conversion of Series Two Preferred Units (in shares)						432,914	153,605
Redemption of OP units issued on conversion of LTIP Units (in shares)						24,028	544,729
Outperformance awards in LTIP Units (in shares)									396,500	396,150	316,325
Outperformance Awards LTIP Units distribution as percentage of OP Unit distribution prior to measurement date						10.00%
Distributions made to OP and LTIP units per unit (in dollars per share)		$ 0.65	$ 0.65	$ 0.65	$ 0.65
Distribution paid to outperformance awards, OPP Units and MYLTIP Units (in dollars per share)		$ 0.065	$ 0.065	$ 0.065	$ 0.065
Distribution Made to Limited Partner, Date of Record														Dec. 31, 2012		Mar. 29, 2013		Jun. 28, 2013		Sep. 30, 2013		Dec. 31, 2013
Dividend payable date													Jan. 29, 2013	Jan. 29, 2013	Apr. 30, 2013	Apr. 30, 2013	Jul. 31, 2013	Jul. 31, 2013	Oct. 31, 2013	Oct. 31, 2013	Jan. 29, 2014	Jan. 29, 2014
Dividends Payable, Date Declared																					Nov. 27, 2013	Nov. 27, 2013
Restriction on redemption of OP Unit to Common Stock (in years)						1
Redemption of OP Unit equivalence to Common Stock (in shares)						1
Common units of operating partnership if converted value						$ 1,700,000,000
Value of Series Two Preferred Units assuming conversion						$ 87,700,000
Closing price of common stock (in dollars per share)	$ 97.98											$ 100.37

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Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2013

Noncontrolling Interest [Abstract]

Schedule of Redeemable Interest in Property Partnerships [Table Text Block]

The following table reflects the activity of the noncontrolling interest—redeemable interest in property partnership in the Company's Fountain Square consolidated joint venture for the for the years ended December 31, 2013 and 2012 (in thousands):

Balance at December 31, 2011	$	—
Acquisition-date fair value of redeemable interest	98,787
Net loss	(719		)
Distributions	(3,032		)
Adjustment to reflect redeemable interest at redemption value	2,522
Balance at December 31, 2012	$	97,558
Net loss	(1,839		)
Distributions	(4,585		)
Adjustment to reflect redeemable interest at redemption value	8,475
Balance at December 31, 2013	$	99,609

Schedule Of Redeemable Preferred Units of the Operating Partnership

The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the years ended December 31, 2013, 2012 and 2011 (in thousands):

Balance at December 31, 2010	$	55,652
Net income	3,339
Distributions	(3,339		)
Balance at December 31, 2011	$	55,652
Issuance of redeemable preferred units (Series Four Preferred Units)	79,405
Net income	3,497
Distributions	(3,497		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(18,329		)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(5,852		)
Balance at December 31, 2012	$	110,876
Net income	6,046
Distributions	(6,046		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(43,070		)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(16,494		)
Balance at December 31, 2013	$	51,312

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Real Estate (Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 10, 2013 Mountain View Research And Technology Parks [Member]	May 31, 2013 767 5th Avenue (The General Motors Building) [Member]		May 31, 2013 Consolidation, Eliminations [Member] 767 5th Avenue (The General Motors Building) [Member]
Restructuring Cost and Reserve [Line Items]
Land				$ 126,521	$ 1,796,252
Building and improvements				82,451	1,447,446
Tenant Improvements				7,326	85,208
In-place lease Intangibles				23,279	357,781
Above market rents				843	101,897
Below market rents				7,336	239,641
Above Market Assumed Debt Adjustments					192,943
Real estate and related intangibles recorded upon consolidation	3,356,000	0	0		3,356,000
Mortgage notes payable	4,449,734	3,102,485			1,300,000
Mezzanine notes payable	311,040	0			306,000
Outside members' notes payable	180,000	0			450,000	[1]	270,000
Debt recorded upon consolidation	2,056,000	0	0		2,056,000
Cash and cash equivalents	79,468	0	0		79,468
Cash held in escrows					2,403
Tenant and other receivables					7,104
Prepaid expenses and other assets					4,269
Accounts payable and other expenses					2,418
Accrued interest payable	167,523	72,461			182,369	[2]	105,500
Other liabilities					6,304
Working capital recorded upon consolidation	177,315	0	0		97,847
Noncontrolling Interest					520,000
Noncontrolling Interest working capital					39,139
Noncontrolling interest in property partnerships recorded upon consolidation	480,861	0	0		480,861
Net Assets Recorded Upon Consolidation					721,292
Aggregate purchase price				$ 233,084

[1] The Company's member loan totaling $270.0 million eliminates in consolidation.

[2] The Company's share of the accrued interest payable on the members' loans totaling approximately $105.5 million eliminates in consolidation.

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Unsecured Exchangeable Senior Notes (Narrative) (Details) (USD $)	12 Months Ended						0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 3.750% Exchangeable Senior Notes [Member]	Dec. 31, 2013 3.625% Exchangeable Senior Notes [Member]	Dec. 31, 2011 2.875% Exchangeable Senior Notes [Member]	May 18, 2013 3.750% Exchangeable Senior Notes [Member]	May 18, 2013 Submitted for Exchange [Member] 3.750% Exchangeable Senior Notes [Member]	May 18, 2013 Redeemed amount [Member] 3.750% Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 450,000,000	$ 747,500,000	$ 862,500,000
Coupon/Stated Rate	3.625%			3.75%	3.625%	2.875%	3.75%
Convertible Debt Effective Interest Rate				5.958%	6.555%	5.63%
Unsecured exchangeable senior notes	744,880,000	1,170,356,000
Net Of Adjustment For Equity Component Allocation	2,438,000	25,500,000
Debt Instrument Convertible Initial Carrying Amount Of The Equity Component	230,300,000
Deferred Financing Costs Equity Component	1,000,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	91,900,000	148,500,000
Debt Instrument, Convertible, Interest Expense	34,800,000	48,400,000	66,300,000
Interest Expense Adjustment Related To Convertible Debt	23,100,000	29,100,000	38,800,000
Notes redemption date							May 18, 2013
Debt instrument redemption price percentage of principal							100.00%
Amount paid for repurchase	0	224,261,000	0					449,010,000	990,000
Common stock, shares issued	153,062,001	151,680,109					419,116
Gains (losses) from early extinguishments of debt	$ 122,000	$ (4,453,000)	$ (1,494,000)				$ (100,000)

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Investment in unconsolidated Joint Ventures (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended									0 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 30, 2013 125 West 55thStreet [Member] sqft	May 31, 2013 767 5th Avenue (The General Motors Building) [Member] partners	Apr. 10, 2013 Mountain View Research And Technology Parks [Member]	Apr. 10, 2013 Mountain View Research [Member]	Apr. 10, 2013 Mountain View Technology [Member]	Oct. 29, 2013 Annapolis Junction Building Six [Member] sqft	Feb. 28, 2013 Annapolis Junction Building Six [Member] sqft	May 31, 2013 500 North Capitol [Member]	Mar. 31, 2013 500 North Capitol [Member] sqft	Apr. 04, 2013 Annapolis Junction Building Seven [Member] Y	Sep. 26, 2013 Annapolis Junction Building Seven [Member] sqft	Jun. 05, 2013 540 Madison Avenue [Member]	Jul. 19, 2013 Eighth Avenue and Forty Sixth Street [Member]	May 30, 2013 Company [Member] 125 West 55thStreet [Member]	Apr. 10, 2013 Company [Member] Mountain View Research And Technology Parks [Member]	Jul. 19, 2013 Company [Member] Eighth Avenue and Forty Sixth Street [Member]	May 31, 2013 Construction Loans [Member] 500 North Capitol [Member]	May 31, 2013 Construction Loans [Member] Company [Member] 500 North Capitol [Member]	May 31, 2013 First Mortgage [Member] 500 North Capitol [Member]	Jun. 05, 2013 First Mortgage [Member] 540 Madison Avenue [Member]	Jun. 05, 2013 Prior to refinance first mortgage loan [Member] 540 Madison Avenue [Member]	Jun. 05, 2013 Prior to refinance first mortgage loan [Member] Company [Member] 540 Madison Avenue [Member]	Oct. 29, 2013 Prior to extension [Member] Annapolis Junction Building Six [Member]	Apr. 10, 2013 Mountain View Research And Technology Parks [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis							LIBOR plus 2.00%	LIBOR plus 2.50%	LIBOR plus 1.65%											LIBOR plus 1.65%			LIBOR plus 1.50%
Equity Method Investment, Ownership Percentage				60.00%					50.00%	50.00%	30.00%	30.00%	50.00%	50.00%	60.00%	50.00%											39.50%
Imputed Sales Price																$ 45,000,000
Net Rentable Area				588,000					119,000	119,000		231,000		125,000
Contractual Sales Price				470,000,000
Carrying Value of Debt Assumed in Sale				198,600,000
Coupon/Stated Rate	3.625%			6.09%																		4.15%		5.20%
Cash Proceeds from the Sale of Real Estate Property				253,700,000												21,800,000	152,200,000
Gain on sales of real estate				43,200,000												12,600,000			11,300,000
Number of Joint Venture Partners					2
Construction Loan Facility Borrowing Capacity													22,000,000
Debt Instrument, Basis Spread on Variable Rate							2.00%	2.50%	1.65%				1.65%							1.65%			1.50%
Maturity date	Feb. 15, 2014			Mar. 10, 2020			May 31, 2014	Nov. 22, 2014	Nov. 17, 2014				Apr. 04, 2016							Oct. 14, 2014		Jun. 06, 2023	Jun. 05, 2018	Jul. 11, 2013		Nov. 17, 2013
Construction Loan									14,000,000
Gains (losses) from early extinguishments of debt	122,000	(4,453,000)	(1,494,000)			(400,000)												(200,000)		(1,000,000)	(300,000)			(300,000)	(200,000)
Proceeds from Issuance of Secured Debt	0	0	1,178,306,000																			105,000,000	120,000,000
Repayments of Secured Debt	80,311,000	253,877,000	1,251,841,000				90,000,000	20,000,000												90,600,000				118,000,000
Repayments of Notes Payable							8,600,000	3,700,000
Number of extensions													2
Extension Option (in years)													1
Ownership upon acquisition																											100.00%
Gain on consolidation of joint ventures	$ 385,991,000	$ 0	$ 0		$ 359,500,000	$ 26,500,000

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Summary Of Significant Accounting Policies Schedule of Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Nov. 27, 2013
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Dividends Payable, Amount Per Share					$ 0.65
Special dividend (per share amount)	$ 2.25
Dividends Treatment For Federal Tax Purposes, Percentage	100.00%		100.00%	100.00%
Dividends treatment for federal tax purposes.	$ 4.75	[1]	$ 2.37	$ 2.11
Dividend Declared [Member]
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Dividends Payable, Amount Per Share	$ 2.90
non-special dividend [Member]
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Dividends Payable, Amount Per Share	$ 0.65
Allocated to fiscal two thousand thirteen [Member]
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Special dividend (per share amount)	$ 2.44
Capital Gains Income [Member]
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Dividends Treatment For Federal Tax Purposes, Percentage	51.29%		3.55%	2.61%
Dividends treatment for federal tax purposes.	$ 2.44		$ 0.08	$ 0.05
Ordinary Income [Member]
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Dividends Treatment For Federal Tax Purposes, Percentage	48.71%		96.45%	97.39%
Dividends treatment for federal tax purposes.	$ 2.31		$ 2.29	$ 2.06
Allocated to fiscal two thousand fourteen [Member]
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]
Special dividend (per share amount)	$ 0.46

[1] The fourth quarter 2013 dividend of $2.90 per common share consists of a $2.25 per common share special dividend and a $0.65 per common share regular quarterly dividend of which approximately $2.44 per common share was allocable to 2013 and approximately $0.46 per common share is allocable to 2014.

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Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Basis Of Presentation And Summary Of Significant Accounting Policies

Summary of Significant Accounting Policies

Real Estate

Upon acquisitions of real estate that constitutes a business, which includes the consolidation of previously unconsolidated joint ventures, the Company assesses the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities, and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. The Company assesses and considers fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that it deems appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenant's credit quality and expectations of lease renewals. Based on its acquisitions to date, the Company's allocation to customer relationship intangible assets has been immaterial.

The Company records acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management's estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below- market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in the Company's Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on the Company's evaluation of the specific characteristics of each tenant's lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses.

Management reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of its assets is not recoverable and exceeds its fair value. If such criteria are present, an impairment loss is recognized based on the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, the Company's established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If the Company's strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If the Company determines that impairment has occurred, the affected assets must be reduced to their fair value, less cost to sell.

Accounting Standards Codification (“ASC”) ASC 360 "Property Plant and Equipment" requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be “held for sale” when the transaction has been approved by the Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that the property sale within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. The Company expenses costs that it incurs to effect a business combination such as legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determinations of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involve a degree of judgment. The Company’s capitalization policy on development properties is guided by guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate – General.” The costs of land and buildings under development include specifically identifiable costs. The capitalized costs include pre-construction costs necessary to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The Company begins the capitalization of costs during the pre-construction period, which it defines as activities that are necessary to the development of the property. The Company considers a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed and (2) occupied or held available for occupancy, and capitalizes only those costs associated with the portion under construction, or if activities necessary for the development of the property have been suspended. Interest costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $68.2 million, $44.3 million and $48.2 million, respectively. Salaries and related costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $7.7 million, $7.1 million and $6.5 million, respectively.

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired, their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period.

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. In accordance with ASC 805, the Company allocates the acquisition cost of real estate to its components and depreciates or amortizes these assets (or liabilities) over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations.

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company’s cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000. The Company has not experienced any losses to date on its invested cash.

Cash Held in Escrows

Escrows include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs.

Investments in Securities

The Company accounts for investments in trading securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The designation of trading securities is generally determined at acquisition. The Company maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2013 and 2012, the Company had maintained approximately $16.6 million and $12.2 million, respectively, in a separate account, which is not restricted as to its use. The Company recognized gains (losses) of approximately $2.9 million, $1.4 million and $(0.4) million on its investments in the account associated with the Company’s deferred compensation plan during the years ended December 31, 2013, 2012 and 2011, respectively.

Tenant and Other Receivables

Tenant and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Deferred Charges

Deferred charges include leasing costs and financing fees. Leasing costs include an allocation for acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage, legal, internal leasing employee salaries and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Internal leasing salaries and related costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $5.1 million, $5.6 million and $4.4 million, respectively. External fees and costs incurred to obtain long-term financing have been deferred and are being amortized over the terms of the respective loans and are included within interest expense. Unamortized financing and leasing costs are charged to expense upon the early repayment or significant modification of the financing or upon the early termination of the lease, respectively. Fully amortized deferred charges are removed from the books upon the expiration of the lease or maturity of the debt.

Investments in Unconsolidated Joint Ventures

The Company consolidates variable interest entities (VIEs) in which it is considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have a controlling financial interest. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity's performance, and (2) the obligation to absorb losses and right to receive the returns from the variable interest entity that would be significant to the variable interest entity. For ventures that are not VIEs the Company consolidates entities for which it has significant decision making control over the ventures' operations. The Company's judgment with respect to its level of influence or control of an entity involves the consideration of various factors including the form of the Company's ownership interest, its representation in the entity's governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the venture, if applicable. The Company's assessment of its influence or control over an entity affects the presentation of these investments in the Company's consolidated financial statements. In addition to evaluating control rights, the Company consolidates entities in which the outside partner has no substantive kick-out rights to remove the Company as the managing member.

Accounts of the consolidated entity are included in the accounts of the Company and the non-controlling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company's share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, the Company's recognition of joint venture income or loss generally follows the joint venture's distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture. The Company's investments in unconsolidated joint ventures are reviewed for impairment periodically and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying values has occurred and such decline is other-than-temporary, which is dependent on a number of factors, including the performance of each investment and market conditions.

To the extent that the Company contributes assets to a joint venture, the Company’s investment in the joint venture is recorded at the Company’s cost basis in the assets that were contributed to the joint venture. To the extent that the Company’s cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company’s share of equity in net income of the joint venture. In accordance with the provisions of ASC 970-323 “Investments—Equity Method and Joint Ventures” (“ASC 970-323”), the Company will recognize gains on the contribution of real estate to joint ventures, relating solely to the outside partner’s interest, to the extent the economic substance of the transaction is a sale.

Equity Offering Costs

Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital.

Treasury Stock

The Company’s share repurchases are reflected as treasury stock utilizing the cost method of accounting and are presented as a reduction to consolidated stockholders’ equity.

Dividends

Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains/losses on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation.

The tax treatment of common dividends per share for federal income tax purposes is as follows:

	For the year ended December 31,
	2013					2012						2011
	Per Share			%		Per Share			%			Per Share			%
Ordinary income	$	2.31		48.71	%	$	2.29	0.5839	96.45	%	0.9093	$	2.06	0.9093	97.39	%
Capital gain income	2.44			51.29	%	0.08		—	3.55	%	—	0.05		—	2.61	%
Total	$	4.75	(1)	100.00	%	$	2.37		100.00	%		$	2.11	1	100.00	%

(1) The fourth quarter 2013 dividend of $2.90 per common share consists of a $2.25 per common share special dividend and a $0.65 per common share regular quarterly dividend of which approximately $2.44 per common share was allocable to 2013 and approximately $0.46 per common share is allocable to 2014.

Revenue Recognition

Contractual rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $65.8 million, $77.6 million and $77.0 million for the years ended December 31, 2013, 2012 and 2011, respectively, as the revenue recorded exceeded amounts billed. Accrued rental income, as reported on the Consolidated Balance Sheets, represents cumulative rental income earned in excess of rent payments received pursuant to the terms of the individual lease agreements. The Company maintains an allowance against accrued rental income for future potential tenant credit losses. The credit assessment is based on the estimated accrued rental income that is recoverable over the term of the lease. The Company also maintains an allowance for doubtful accounts for estimated losses resulting from the inability of tenants to make required rent payments. The computation of this allowance is based on the tenants’ payment history and current credit status, as well as certain industry or geographic specific credit considerations. If the Company’s estimates of collectability differ from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. The credit risk is mitigated by the high quality of the Company’s existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of the Company’s portfolio to identify potential problem tenants.

In accordance with ASC 805, the Company recognizes rental revenue of acquired in-place “above-” and “below-market” leases at their fair values over the terms of the respective leases. The impact of the acquired in-place “above-” and “below-market” leases increased revenue by approximately $28.0 million, $14.6 million and $10.8 million for the years ended December 31, 2013, 2012 and 2011, respectively. The following table summarizes the scheduled amortization of the Company's acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2014	$	23,669	$	61,700
2015	22,758		55,207
2016	20,576		52,461
2017	12,279		40,346
2018	8,637		37,774

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred. Tenant reimbursements are recognized and presented in accordance with guidance in ASC 605-45 “Principal Agent Considerations” (“ASC 605-45”). ASC 605-45 requires that these reimbursements be recorded on a gross basis, as the Company is generally the primary obligor with respect to purchasing goods and services from third-party suppliers, has discretion in selecting the supplier and has credit risk. The Company also receives reimbursement of payroll and payroll related costs from third parties which the Company reflects on a net basis in accordance with ASC 605-45.

The Company's parking revenues are derived from leases, monthly parking and transient parking. The Company recognizes parking revenue as earned.

The Company’s hotel revenues are derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenues are recognized as earned.

The Company receives management and development fees from third parties. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. The Company reviews each development agreement and records development fees as earned depending on the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

Gains on sales of real estate are recognized pursuant to the provisions included in ASC 360-20 “Real Estate Sales” (“ASC 360-20”). The specific timing of a sale is measured against various criteria in ASC 360-20 related to the terms of the transaction and any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, the Company defers some or all of the gain recognition and accounts for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Ground Leases

The Company has non-cancelable ground lease obligations with various initial term expiration dates through 2068. The Company recognizes ground rent expense on a straight-line basis over the terms of the respective ground lease agreements. The future contractual minimum lease payments to be made by the Company as of December 31, 2013, under non-cancelable ground leases which expire on various dates through 2068, are as follows:

Years Ending December 31,	(in thousands)
2014	$	13,184
2015	13,507
2016	13,732
2017	13,963
2018	14,198
Thereafter	899,187

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings (if any) of certain securities issued by the Operating Partnership, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and securities of the Operating Partnership that are exchangeable for Common Stock.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, marketable securities, escrows, receivables, accounts payable, accrued expenses and other assets and liabilities are reasonable estimates of their fair values because of the short maturities of these instruments.

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The Company determines the fair value of its unsecured senior notes and unsecured exchangeable senior notes using market prices. The inputs used in determining the fair value of the Company’s unsecured senior notes and unsecured exchangeable senior notes is categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company uses quoted market rates to value these instruments. However, the inputs used in determining the fair value could be categorized at a level 2 basis if trading volumes are low. The Company determines the fair value of its mortgage notes payable using discounted cash flow analyses by discounting the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt based on current market rates for similar securities. In determining the current market rates, the Company adds its estimates of market spreads to the quoted yields on federal government treasury securities with similar maturity dates to its debt. The inputs used in determining the fair value of the Company’s mortgage notes payable and mezzanine notes payable are categorized at a level 3 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company considers the rates used in the valuation techniques to be unobservable inputs.

Because the Company’s valuations of its financial instruments are based on these types of estimates, the actual fair values of its financial instruments may differ materially if the Company’s estimates do not prove to be accurate. The following table presents the aggregate carrying value of the Company’s indebtedness and the Company’s corresponding estimate of fair value as of December 31, 2013 and December 31, 2012 (in thousands):

	December 31, 2013					December 31, 2012
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,449,734		$	4,545,283	$	3,102,485		$	3,256,940
Mezzanine notes payable	311,040			311,064		—			—
Unsecured senior notes	5,835,854			6,050,517		4,639,528			5,162,486
Unsecured exchangeable senior notes	744,880		(1)	750,266		1,170,356		(1)	1,278,554
Total	$	11,341,508		$	11,657,130	$	8,912,369		$	9,697,980

 _______________

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million and $25.5 million at December 31, 2013 and December 31, 2012, respectively.

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the consolidated balance sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for the effective portion of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the effective portion to earnings over the term that the hedged transaction affects earnings. The Company accounts for the ineffective portion of changes in the fair value of a derivative directly in earnings.

Income Taxes

The Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”), commencing with its taxable year ended December 31, 1997. As a result, the Company generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual taxable income. The Company’s policy is to distribute at least 100% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to the Company’s consolidated taxable REIT subsidiaries. The Company’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. The Company has no uncertain tax positions recognized as of December 31, 2013 and 2012.

The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of the Operating Partnership, is the lessee pursuant to the lease for the hotel property. As lessor, the Operating Partnership is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, the Company has recorded a tax provision in the Company’s Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011.

The net difference between the tax basis and the reported amounts of the Company’s assets and liabilities is approximately $1.7 billion and $0.8 billion as of December 31, 2013 and 2012, respectively, which is primarily related to the difference in basis of contributed property and accrued rental income.

Certain entities included in the Company’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements.

The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	749,811		$	289,650		$	272,679
Straight-line rent adjustments	(74,445		)	(80,281		)	(77,422		)
Book/Tax differences from depreciation and amortization	170,370			105,599			117,675
Book/Tax differences on gains/losses from capital transactions	(124,413		)	(22,408		)	(38,443		)
Book/Tax differences from stock-based compensation	42,146			19,660			827
Other book/tax differences, net	(12,797		)	35,461			29,389
Taxable income	$	750,672		$	347,681		$	304,705

Stock-Based Employee Compensation Plans

At December 31, 2013, the Company has a stock-based employee compensation plan. Effective January 1, 2005, the Company adopted early ASC 718 “Compensation – Stock Compensation” (“ASC 718”), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.

Out-of-Period Adjustment

During the year ended December 31, 2012, the Company recorded additional real estate operating expenses totaling approximately $3.2 million related to the cumulative non-cash straight-line adjustment to the ground rent expense of certain ground leases that were not previously recognized on a straight-line basis. This resulted in the overstatement of real estate operating expenses by approximately $3.2 million during the year ended December 31, 2012 and in the understatement of real estate operating expenses in the aggregate amount of approximately $3.2 million in previous periods. Because this adjustment was not material to the prior years’ consolidated financial statements and the impact of recording the adjustment in the current period is not material to the Company’s consolidated financial statements, the Company recorded the related adjustment during the year ended December 31, 2012.

Reclassifications

The Company has modified the presentation of expenses to operate its San Francisco and Princeton regional offices to reflect the growing activity in its San Francisco region and to have a consistent presentation across the Company. These expenses, which totaled approximately $8.1 million, $7.7 million and $7.5 million for the years ended December 31, 2013, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2013-02, "Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income" (“ASU No. 2013-02”). ASU No. 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income, but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU No. 2013-02 is effective prospectively for reporting periods beginning after December 15, 2012. The Company’s adoption of ASU No. 2013-02 did not have a material impact on its consolidated financial statements.

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Mortgage Notes Payable Schedule Of Aggregate Principal Payments On Mortgage Notes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Mortgage Notes Payable [Abstract]
2014	$ 87,759
2015	26,182
2016	608,879
2017	2,821,750
2018	18,633
Thereafter	695,327
Total	4,258,530
Unamoritized balance of histroical fair value adjustments	191,204
Total carrying value of mortgage notes payable	$ 4,449,734	$ 3,102,485

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Organization (Details) (USD $)	12 Months Ended												12 Months Ended			12 Months Ended
	Dec. 31, 2013 Y acre sqft Vehicles	Dec. 31, 2012	Dec. 31, 2013 Commercial Real Estate Properties [Member] Real_Estate_Properties sqft	Dec. 31, 2013 Total Properties Under Construction [ Member] sqft Real_Estate_Properties	Dec. 31, 2013 Total Office Properties [ Member] Real_Estate_Properties	Dec. 31, 2013 Class A Office Properties [Member] Real_Estate_Properties	Dec. 31, 2013 Office Properties Under Construction [ Member] Real_Estate_Properties	Dec. 31, 2013 Office Technical Properties [Member] Real_Estate_Properties	Dec. 31, 2013 Hotel Property [ Member] Real_Estate_Properties	Dec. 31, 2013 Retail Properties [ Member] Real_Estate_Properties	Dec. 31, 2013 Residential Properties [Member] Real_Estate_Properties	Dec. 31, 2013 Residential Properties Under Construction [Member] Real_Estate_Properties	Dec. 31, 2013 Series Two Preferred Units [Member]	Dec. 31, 2013 Series Four Preferred Units [Member]	Aug. 29, 2013 Series Four Preferred Units [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Depositary shares of Series B Cumulative Redeemable Preferred [Member]	Dec. 31, 2013 Series B Preferred Units [Member]
Real Estate Properties [Line Items]
General and limited partnership interest in the operating partnership (percent)	89.50%	89.00%
Restriction on redemption of OP units from date of issuance (years)	1
One OP unit is equivalent to one share of Common Stock (in shares)	1
OP unit conversion rate (in shares)	1
Number Of series Of preferred units outstanding	3
OP Units for each Preferred Unit (in shares)													1.312336
Preferred Units Liquidation Preference													$ 50.00	$ 50.00	$ 50.00
Quarterly Distributions to Series Four Preferred Units														$ 0.25
Series Four Preferred Units Annual Dividend Payable Rate														2.00%
Number of real estate properties			175	9	167	128	8	39	1	4	3	1
Net Rentable Area			44,400,000	2,900,000
Number of vehicles in structured parking	45,234
Area of parking (in square feet)	15,400,000
Area of undeveloped land parcels owned (in acres)	503.6
Preferred stock, shares outstanding	0	0														80,000	0	8,000,000	80,000
Preferred Stock, Dividend Rate, Percentage																5.25%

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Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Real Estate

Real Estate

Upon acquisitions of real estate that constitutes a business, which includes the consolidation of previously unconsolidated joint ventures, the Company assesses the fair value of acquired tangible and intangible assets (including land, buildings, tenant improvements, “above-” and “below-market” leases, leasing and assumed financing origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities, and allocates the purchase price to the acquired assets and assumed liabilities, including land and buildings as if vacant. The Company assesses and considers fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that it deems appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known and anticipated trends, and market and economic conditions. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenant's credit quality and expectations of lease renewals. Based on its acquisitions to date, the Company's allocation to customer relationship intangible assets has been immaterial.

The Company records acquired “above-” and “below-market” leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual amounts to be paid pursuant to each in-place lease and (2) management's estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below- market leases. Acquired “above-” and “below-market” lease values have been reflected within Prepaid Expenses and Other Assets and Other Liabilities, respectively, in the Company's Consolidated Balance Sheets. Other intangible assets acquired include amounts for in-place lease values that are based on the Company's evaluation of the specific characteristics of each tenant's lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses.

Management reviews its long-lived assets for impairment following the end of each quarter and when there is an event or change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of its assets is not recoverable and exceeds its fair value. If such criteria are present, an impairment loss is recognized based on the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be “long-lived assets to be held and used” are considered on an undiscounted basis to determine whether an asset has been impaired, the Company's established strategy of holding properties over the long term directly decreases the likelihood of recording an impairment loss. If the Company's strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If the Company determines that impairment has occurred, the affected assets must be reduced to their fair value, less cost to sell.

Accounting Standards Codification (“ASC”) ASC 360 "Property Plant and Equipment" requires that qualifying assets and liabilities and the results of operations that have been sold, or otherwise qualify as “held for sale,” be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have significant continuing involvement following the sale. The components of the property’s net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be “held for sale” when the transaction has been approved by the Board of Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that the property sale within one year is considered probable. Following the classification of a property as “held for sale,” no further depreciation is recorded on the assets, and the asset is written down to the lower of carrying value or fair market value, less cost to sell.

Real estate is stated at depreciated cost. A variety of costs are incurred in the acquisition, development and leasing of properties. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. The Company expenses costs that it incurs to effect a business combination such as legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determinations of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involve a degree of judgment. The Company’s capitalization policy on development properties is guided by guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate – General.” The costs of land and buildings under development include specifically identifiable costs. The capitalized costs include pre-construction costs necessary to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The Company begins the capitalization of costs during the pre-construction period, which it defines as activities that are necessary to the development of the property. The Company considers a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed and (2) occupied or held available for occupancy, and capitalizes only those costs associated with the portion under construction, or if activities necessary for the development of the property have been suspended. Interest costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $68.2 million, $44.3 million and $48.2 million, respectively. Salaries and related costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $7.7 million, $7.1 million and $6.5 million, respectively.

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired, their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period.

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. In accordance with ASC 805, the Company allocates the acquisition cost of real estate to its components and depreciates or amortizes these assets (or liabilities) over their useful lives. The amortization of acquired “above-” and “below-market” leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations.

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the Company’s cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000. The Company has not experienced any losses to date on its invested cash.

Cash Held in Escrows

Cash Held in Escrows

Escrows include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs.

Investments in Securities

Investments in Securities

The Company accounts for investments in trading securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The designation of trading securities is generally determined at acquisition. The Company maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2013 and 2012, the Company had maintained approximately $16.6 million and $12.2 million, respectively, in a separate account, which is not restricted as to its use. The Company recognized gains (losses) of approximately $2.9 million, $1.4 million and $(0.4) million on its investments in the account associated with the Company’s deferred compensation plan during the years ended December 31, 2013, 2012 and 2011, respectively.

Tenant and Other Receivables

Tenant and Other Receivables

Tenant and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Deferred Charges

Deferred Charges

Deferred charges include leasing costs and financing fees. Leasing costs include an allocation for acquired intangible in-place lease values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage, legal, internal leasing employee salaries and other costs which have been deferred and are being amortized on a straight-line basis over the terms of the respective leases. Internal leasing salaries and related costs capitalized for the years ended December 31, 2013, 2012 and 2011 were $5.1 million, $5.6 million and $4.4 million, respectively. External fees and costs incurred to obtain long-term financing have been deferred and are being amortized over the terms of the respective loans and are included within interest expense. Unamortized financing and leasing costs are charged to expense upon the early repayment or significant modification of the financing or upon the early termination of the lease, respectively. Fully amortized deferred charges are removed from the books upon the expiration of the lease or maturity of the debt.

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

The Company consolidates variable interest entities (VIEs) in which it is considered to be the primary beneficiary. VIEs are entities in which the equity investors do not have sufficient equity at risk to finance their endeavors without additional financial support or that the holders of the equity investment at risk do not have a controlling financial interest. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity's performance, and (2) the obligation to absorb losses and right to receive the returns from the variable interest entity that would be significant to the variable interest entity. For ventures that are not VIEs the Company consolidates entities for which it has significant decision making control over the ventures' operations. The Company's judgment with respect to its level of influence or control of an entity involves the consideration of various factors including the form of the Company's ownership interest, its representation in the entity's governance, the size of its investment (including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the venture, if applicable. The Company's assessment of its influence or control over an entity affects the presentation of these investments in the Company's consolidated financial statements. In addition to evaluating control rights, the Company consolidates entities in which the outside partner has no substantive kick-out rights to remove the Company as the managing member.

Accounts of the consolidated entity are included in the accounts of the Company and the non-controlling interest is reflected on the Consolidated Balance Sheets as a component of equity or in temporary equity between liabilities and equity. Investments in unconsolidated joint ventures are recorded initially at cost, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Company's share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses; however, the Company's recognition of joint venture income or loss generally follows the joint venture's distribution priorities, which may change upon the achievement of certain investment return thresholds. The Company may account for cash distributions in excess of its investment in an unconsolidated joint venture as income when the Company is not the general partner in a limited partnership and when the Company has neither the requirement nor the intent to provide financial support to the joint venture. The Company's investments in unconsolidated joint ventures are reviewed for impairment periodically and the Company records impairment charges when events or circumstances change indicating that a decline in the fair values below the carrying values has occurred and such decline is other-than-temporary, which is dependent on a number of factors, including the performance of each investment and market conditions.

To the extent that the Company contributes assets to a joint venture, the Company’s investment in the joint venture is recorded at the Company’s cost basis in the assets that were contributed to the joint venture. To the extent that the Company’s cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized over the life of the related asset and included in the Company’s share of equity in net income of the joint venture. In accordance with the provisions of ASC 970-323 “Investments—Equity Method and Joint Ventures” (“ASC 970-323”), the Company will recognize gains on the contribution of real estate to joint ventures, relating solely to the outside partner’s interest, to the extent the economic substance of the transaction is a sale.

Equity Offering Costs

Equity Offering Costs

Underwriting commissions and offering costs have been reflected as a reduction of additional paid-in capital

Treasury Stock

Treasury Stock

The Company’s share repurchases are reflected as treasury stock utilizing the cost method of accounting and are presented as a reduction to consolidated stockholders’ equity.

Dividends

Dividends

Earnings and profits, which determine the taxability of dividends to stockholders, will differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of gains/losses on the sale of real property, revenue and expense recognition, compensation expense, and in the estimated useful lives and basis used to compute depreciation.

The tax treatment of common dividends per share for federal income tax purposes is as follows:

	For the year ended December 31,
	2013					2012						2011
	Per Share			%		Per Share			%			Per Share			%
Ordinary income	$	2.31		48.71	%	$	2.29	0.5839	96.45	%	0.9093	$	2.06	0.9093	97.39	%
Capital gain income	2.44			51.29	%	0.08		—	3.55	%	—	0.05		—	2.61	%
Total	$	4.75	(1)	100.00	%	$	2.37		100.00	%		$	2.11	1	100.00	%

(1) The fourth quarter 2013 dividend of $2.90 per common share consists of a $2.25 per common share special dividend and a $0.65 per common share regular quarterly dividend of which approximately $2.44 per common share was allocable to 2013 and approximately $0.46 per common share is allocable to 2014.

Revenue Recognition

Revenue Recognition

Contractual rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $65.8 million, $77.6 million and $77.0 million for the years ended December 31, 2013, 2012 and 2011, respectively, as the revenue recorded exceeded amounts billed. Accrued rental income, as reported on the Consolidated Balance Sheets, represents cumulative rental income earned in excess of rent payments received pursuant to the terms of the individual lease agreements. The Company maintains an allowance against accrued rental income for future potential tenant credit losses. The credit assessment is based on the estimated accrued rental income that is recoverable over the term of the lease. The Company also maintains an allowance for doubtful accounts for estimated losses resulting from the inability of tenants to make required rent payments. The computation of this allowance is based on the tenants’ payment history and current credit status, as well as certain industry or geographic specific credit considerations. If the Company’s estimates of collectability differ from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. The credit risk is mitigated by the high quality of the Company’s existing tenant base, reviews of prospective tenants’ risk profiles prior to lease execution and consistent monitoring of the Company’s portfolio to identify potential problem tenants.

In accordance with ASC 805, the Company recognizes rental revenue of acquired in-place “above-” and “below-market” leases at their fair values over the terms of the respective leases. The impact of the acquired in-place “above-” and “below-market” leases increased revenue by approximately $28.0 million, $14.6 million and $10.8 million for the years ended December 31, 2013, 2012 and 2011, respectively. The following table summarizes the scheduled amortization of the Company's acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2014	$	23,669	$	61,700
2015	22,758		55,207
2016	20,576		52,461
2017	12,279		40,346
2018	8,637		37,774

Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred. Tenant reimbursements are recognized and presented in accordance with guidance in ASC 605-45 “Principal Agent Considerations” (“ASC 605-45”). ASC 605-45 requires that these reimbursements be recorded on a gross basis, as the Company is generally the primary obligor with respect to purchasing goods and services from third-party suppliers, has discretion in selecting the supplier and has credit risk. The Company also receives reimbursement of payroll and payroll related costs from third parties which the Company reflects on a net basis in accordance with ASC 605-45.

The Company's parking revenues are derived from leases, monthly parking and transient parking. The Company recognizes parking revenue as earned.

The Company’s hotel revenues are derived from room rentals and other sources such as charges to guests for telephone service, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenues are recognized as earned.

The Company receives management and development fees from third parties. Property management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. The Company reviews each development agreement and records development fees as earned depending on the risk associated with each project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners’ ownership interest.

Gains on sales of real estate are recognized pursuant to the provisions included in ASC 360-20 “Real Estate Sales” (“ASC 360-20”). The specific timing of a sale is measured against various criteria in ASC 360-20 related to the terms of the transaction and any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria for the full accrual method are not met, the Company defers some or all of the gain recognition and accounts for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Ground Leases

Ground Leases

The Company has non-cancelable ground lease obligations with various initial term expiration dates through 2068. The Company recognizes ground rent expense on a straight-line basis over the terms of the respective ground lease agreements. The future contractual minimum lease payments to be made by the Company as of December 31, 2013, under non-cancelable ground leases which expire on various dates through 2068, are as follows:

Years Ending December 31,	(in thousands)
2014	$	13,184
2015	13,507
2016	13,732
2017	13,963
2018	14,198
Thereafter	899,187

Earnings Per Share

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings (if any) of certain securities issued by the Operating Partnership, by the weighted average number of shares of Common Stock outstanding during the year. Diluted EPS reflects the potential dilution that could occur from shares issuable in connection with awards under stock-based compensation plans, including upon the exercise of stock options, and securities of the Operating Partnership that are exchangeable for Common Stock.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, marketable securities, escrows, receivables, accounts payable, accrued expenses and other assets and liabilities are reasonable estimates of their fair values because of the short maturities of these instruments.

The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The Company determines the fair value of its unsecured senior notes and unsecured exchangeable senior notes using market prices. The inputs used in determining the fair value of the Company’s unsecured senior notes and unsecured exchangeable senior notes is categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company uses quoted market rates to value these instruments. However, the inputs used in determining the fair value could be categorized at a level 2 basis if trading volumes are low. The Company determines the fair value of its mortgage notes payable using discounted cash flow analyses by discounting the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt based on current market rates for similar securities. In determining the current market rates, the Company adds its estimates of market spreads to the quoted yields on federal government treasury securities with similar maturity dates to its debt. The inputs used in determining the fair value of the Company’s mortgage notes payable and mezzanine notes payable are categorized at a level 3 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company considers the rates used in the valuation techniques to be unobservable inputs.

Because the Company’s valuations of its financial instruments are based on these types of estimates, the actual fair values of its financial instruments may differ materially if the Company’s estimates do not prove to be accurate. The following table presents the aggregate carrying value of the Company’s indebtedness and the Company’s corresponding estimate of fair value as of December 31, 2013 and December 31, 2012 (in thousands):

	December 31, 2013					December 31, 2012
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,449,734		$	4,545,283	$	3,102,485		$	3,256,940
Mezzanine notes payable	311,040			311,064		—			—
Unsecured senior notes	5,835,854			6,050,517		4,639,528			5,162,486
Unsecured exchangeable senior notes	744,880		(1)	750,266		1,170,356		(1)	1,278,554
Total	$	11,341,508		$	11,657,130	$	8,912,369		$	9,697,980

 _______________

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million and $25.5 million at December 31, 2013 and December 31, 2012, respectively.

Derivative Instruments and Hedging Activities

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges. These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the consolidated balance sheets. While management believes its judgments are reasonable, a change in a derivative’s effectiveness as a hedge could materially affect expenses, net income and equity. The Company accounts for the effective portion of changes in the fair value of a derivative in other comprehensive income (loss) and subsequently reclassifies the effective portion to earnings over the term that the hedged transaction affects earnings. The Company accounts for the ineffective portion of changes in the fair value of a derivative directly in earnings.

Income Taxes

Income Taxes

The Company has elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”), commencing with its taxable year ended December 31, 1997. As a result, the Company generally will not be subject to federal corporate income tax on its taxable income that is distributed to its stockholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual taxable income. The Company’s policy is to distribute at least 100% of its taxable income. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to the Company’s consolidated taxable REIT subsidiaries. The Company’s taxable REIT subsidiaries did not have significant tax provisions or deferred income tax items. The Company has no uncertain tax positions recognized as of December 31, 2013 and 2012.

The Company owns a hotel property which is managed through a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of the Operating Partnership, is the lessee pursuant to the lease for the hotel property. As lessor, the Operating Partnership is entitled to a percentage of gross receipts from the hotel property. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreement. The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, the Company has recorded a tax provision in the Company’s Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011.

The net difference between the tax basis and the reported amounts of the Company’s assets and liabilities is approximately $1.7 billion and $0.8 billion as of December 31, 2013 and 2012, respectively, which is primarily related to the difference in basis of contributed property and accrued rental income.

Certain entities included in the Company’s consolidated financial statements are subject to certain state and local taxes. These taxes are recorded as operating expenses in the accompanying consolidated financial statements.

The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	749,811		$	289,650		$	272,679
Straight-line rent adjustments	(74,445		)	(80,281		)	(77,422		)
Book/Tax differences from depreciation and amortization	170,370			105,599			117,675
Book/Tax differences on gains/losses from capital transactions	(124,413		)	(22,408		)	(38,443		)
Book/Tax differences from stock-based compensation	42,146			19,660			827
Other book/tax differences, net	(12,797		)	35,461			29,389
Taxable income	$	750,672		$	347,681		$	304,705

Share-Based Employee Compensation Plans

Stock-Based Employee Compensation Plans

At December 31, 2013, the Company has a stock-based employee compensation plan. Effective January 1, 2005, the Company adopted early ASC 718 “Compensation – Stock Compensation” (“ASC 718”), which revised the fair value based method of accounting for share-based payment liabilities, forfeitures and modifications of stock-based awards and clarified previous guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

Use of Estimatesin the Preperation of Financial Statements

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2013-02, "Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income" (“ASU No. 2013-02”). ASU No. 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income, but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU No. 2013-02 is effective prospectively for reporting periods beginning after December 15, 2012. The Company’s adoption of ASU No. 2013-02 did not have a material impact on its consolidated financial statements.

XML

Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2013

SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]

Real Estate and Accumulated Depreciation Disclosure [Text Block]

Boston Properties, Inc.

Schedule 3 - Real Estate and Accumulated Depreciation

December 31, 2013

(dollars in thousands)

Property Name	Type	Location	Encumbrances		Original				Costs Capitalized Subsequent to Acquisition			Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total	Accumulated Depreciation		Year(s) Built/ Renovated	Depreciable Lives  (Years)
					Land		Building
767 Fifth Avenue (The General Motors Building)	Office	New York, NY	$	1,463,143	$	1,796,252	$	1,532,654	$	4,481		$	1,796,252	$	1,537,135	$	—	$	—	3,333,387	$	28,901	1968	(1)
Embarcadero Center	Office	San Francisco, CA	360,133		179,697		847,410		314,292			195,985		1,145,414		—		—		1,341,399	472,324		1970/1989	(1)
Prudential Center	Office	Boston, MA	—		92,077		734,594		354,501			107,426		1,057,815		15,931		—		1,181,172	398,909		1965/1993/2002	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		107,604			354,107		793,055		—		—		1,147,162	219,938		1961	(1)
601 Lexington Avenue	Office	New York, NY	722,253		241,600		494,782		217,155			289,639		663,898		—		—		953,537	205,721		1977/1997	(1)
The John Hancock Tower and Garage	Office	Boston, MA	652,933		219,543		667,884		57,420			219,616		724,812		419		—		944,847	78,366		1976	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		85,146			169,193		461,804		—		—		630,997	137,934		2004	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		6,020			131,067		441,760		214		—		573,041	29,060		1971-1975	(1)
Carnegie Center	Office	Princeton, NJ	—		105,107		377,259		66,866			103,064		443,817		2,206		145		549,232	169,587		1983-1999	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		11,644			63,988		466,181		—		—		530,169	39,697		2011	(1)
Fountain Square	Office	Reston, VA	226,604		56,853		306,298		3,877			56,853		310,175		—		—		367,028	15,460		1986-1990	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		6,309			103,000		259,974		—		—		362,974	15,901		2012	(1)
599 Lexington Avenue	Office	New York, NY	750,000		81,040		100,507		123,179			87,852		216,874		—		—		304,726	144,094		1986	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		9,790			13,687		247,185		—		—		260,872	50,831		2008-2009	(1)
Gateway Center	Office	San Francisco, CA	—		28,255		139,245		51,330			30,627		188,203		—		—		218,830	80,461		1984/1986/2002	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		47,332			18,789		195,783		—		—		214,572	21,339		1985-1989	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		3,767			—		187,308		—		—		187,308	18,185		2011	(1)
Mountain View Research Park	Office	Mountain View, CA	—		106,162		76,137		2,196			106,162		78,333		—		—		184,495	3,013		1977-1981/2007-2013	(1)
One and Two Patriots Park	Office	Reston, VA	—		18,429		126,315		34,994			22,352		157,386		—		—		179,738	7,032		1987/1988/2012/2013	(1)
3200 Zanker Road	Office	San Jose, CA	—		36,705		82,863		24,669			36,997		103,496		3,744		—		144,237	23,165		1988	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		92,619		27,446			20,118		118,552		—		—		138,670	52,829		1955/1987	(1)
1333 New Hampshire Avenue	Office	Washington, DC	—		34,032		85,660		9,061			35,394		93,359		—		—		128,753	30,392		1996	(1)
505 9th Street	Office	Washington, DC	121,360		38,885		83,719		5,692			42,082		86,214		—		—		128,296	20,358		2007	(1)
Kingstowne Towne Center	Office	Alexandria, VA	33,338		18,021		109,038		742			18,062		109,739		—		—		127,801	26,526		2003-2006	(1)
1330 Connecticut Avenue	Office	Washington, DC	—		25,982		82,311		16,286			27,135		97,444		—		—		124,579	29,518		1984	(1)
Capital Gallery	Office	Washington, DC	—		4,725		29,565		86,993			8,662		112,621		—		—		121,283	50,217		1981/2006	(1)
Weston Corporate Center	Office	Weston, MA	—		25,753		92,312		(123		)	25,854		92,088		—		—		117,942	10,921		2010	(1)
One Freedom Square	Office	Reston, VA	—		9,929		84,504		16,666			11,293		99,806		—		—		111,099	32,827		2000	(1)
One and Two Reston Overlook	Office	Reston, VA	—		16,456		66,192		26,635			17,561		91,722		—		—		109,283	31,144		1999	(1)
Two Freedom Square	Office	Reston, VA	—		13,930		77,739		13,816			15,420		90,065		—		—		105,485	37,294		2001	(1)
Seven Cambridge Center	Office	Cambridge, MA	—		3,457		97,136		2,880			4,125		99,348		—		—		103,473	47,498		2006	(1)

Five Cambridge Center	Office	Cambridge, MA	—	18,863	53,346	29,762		21,173	80,798	—	—	101,971	19,158	1981/1996	(1)
140 Kendrick Street	Office	Needham, MA	—	18,095	66,905	14,759		19,092	80,667	—	—	99,759	17,433	2000	(1)
Discovery Square	Office	Reston, VA	—	11,198	71,782	16,189		12,533	86,636	—	—	99,169	28,865	2001	(1)
Four Cambridge Center	Office	Cambridge, MA	—	19,104	52,078	11,872		20,785	62,269	—	—	83,054	10,761	1983/1998	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	8,462		11,097	68,444	—	—	79,541	21,709	2003	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	3,160		13,873	63,517	—	—	77,390	12,301	2008	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	13,102		13,593	62,521	—	—	76,114	17,601	1992	(1)
North First Business Park	Office	San Jose, CA	—	58,402	13,069	4,010		23,377	16,215	35,889	—	75,481	10,208	1981	(1)
Seventeen Cambridge Center	Office	Cambridge, MA	—	18,080	51,262	—		18,080	51,262	—	—	69,342	1,080	2013	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	502		16,741	51,787	—	—	68,528	4,390	1987/2003	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	12,787		—	66,136	—	—	66,136	11,573	2009	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	5,346		10,148	55,190	—	—	65,338	21,034	1984	(1)
New Dominion Technology Park, Bldg. Two	Office	Herndon, VA	63,000	5,584	51,868	3,894		6,510	54,836	—	—	61,346	16,557	2004	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	23,679		1,478	51,570	—	—	53,048	23,282	1985	(1)
New Dominion Technology Park, Bldg. One	Office	Herndon, VA	43,278	3,880	43,227	3,882		4,583	46,406	—	—	50,989	19,584	2001	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	8,568		16,813	32,886	—	—	49,699	14,834	1999	(1)
191 Spring Street	Office	Lexington, MA	—	2,850	27,166	18,558		3,151	45,423	—	—	48,574	29,636	1971/1995	(1)
One Cambridge Center	Office	Cambridge, MA	—	134	25,110	20,608		548	45,304	—	—	45,852	24,914	1987	(1)
University Place	Office	Cambridge, MA	13,692	—	37,091	6,785		390	43,486	—	—	43,876	20,692	1985	(1)
2600 Tower Oaks Boulevard	Office	Rockville, MD	—	4,243	31,125	8,257		4,785	38,840	—	—	43,625	16,576	2001	(1)
Quorum Office Park	Office	Chelmsford, MA	—	3,750	32,454	5,672		5,187	36,689	—	—	41,876	12,748	2001	(1)
Three Patriots Park	Office	Reston, VA	—	3,594	32,977	3,013		4,009	35,575	—	—	39,584	12,465	2006	(1)
500 E Street	Office	Washington, DC	—	109	22,420	12,854		2,379	33,004	—	—	35,383	20,633	1987	(1)
Eight Cambridge Center	Office	Cambridge, MA	—	850	25,042	8,507		1,323	33,076	—	—	34,399	11,139	1999	(1)
Mountain View Technology Park	Office	Mountain View, CA	—	20,359	13,640	182		20,359	13,822	—	—	34,181	761	1972	(1)
Three Cambridge Center	Office	Cambridge, MA	—	174	12,200	8,758		965	20,167	—	—	21,132	9,768	1987	(1)
Ten Cambridge Center	Office	Cambridge, MA	—	1,299	12,943	6,117		2,395	17,964	—	—	20,359	11,337	1990	(1)
201 Spring Street	Office	Lexington, MA	—	2,849	15,303	(154	)	3,124	14,874	—	—	17,998	6,034	1997	(1)
40 Shattuck Road	Office	Andover, MA	—	709	14,740	2,453		893	17,009	—	—	17,902	5,547	2001	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	13,762		1,264	14,922	—	—	16,186	10,566	1982	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—	594	6,748	7,819		802	14,359	—	—	15,161	9,914	1985	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	10,283		425	13,358	—	—	13,783	7,486	1979	(1)
181 Spring Street	Office	Lexington, MA	—	1,066	9,520	1,950		1,160	11,376	—	—	12,536	4,007	1999	(1)
195 West Street	Office	Waltham, MA	—	1,611	6,652	4,175		1,858	10,580	—	—	12,438	6,187	1990	(1)
91 Hartwell Avenue	Office	Lexington, MA	—	784	6,464	4,984		941	11,291	—	—	12,232	7,535	1985	(1)
Eleven Cambridge Center	Office	Cambridge, MA	—	121	5,535	5,131		324	10,463	—	—	10,787	7,240	1984	(1)
7501 Boston Boulevard, Building Seven	Office	Springfield, VA	—	665	9,273	544		791	9,691	—	—	10,482	3,895	1997	(1)
7435 Boston Boulevard, Building One	Office	Springfield, VA	—	392	3,822	3,895		659	7,450	—	—	8,109	5,526	1982	(1)
7450 Boston Boulevard, Building Three	Office	Springfield, VA	—	1,165	4,681	1,915		1,430	6,331	—	—	7,761	2,917	1987	(1)
8000 Grainger Court, Building Five	Office	Springfield, VA	—	366	4,282	2,944		601	6,991	—	—	7,592	5,160	1984	(1)
453 Ravendale Drive	Office	Mountain View, CA	—	5,477	1,090	230		5,477	1,320	—	—	6,797	142	1977	(1)
7500 Boston Boulevard, Building Six	Office	Springfield, VA	—	138	3,749	2,590		406	6,071	—	—	6,477	4,133	1985	(1)
7601 Boston Boulevard, Building Eight	Office	Springfield, VA	—	200	878	4,875		551	5,402	—	—	5,953	3,576	1986	(1)
Fourteen Cambridge Center	Office	Cambridge, MA	—	110	4,483	1,223		273	5,543	—	—	5,816	3,805	1983	(1)
7300 Boston Boulevard, Building Thirteen	Office	Springfield, VA	—	608	4,773	230		661	4,950	—	—	5,611	3,934	2002	(1)
8000 Corporate Court, Building Eleven	Office	Springfield, VA	—	136	3,071	1,484		775	3,916	—	—	4,691	2,355	1989	(1)

7374 Boston Boulevard, Building Four	Office	Springfield, VA	—				241		1,605		1,902			398		3,350		—		—		3,748		2,327		1984	(1)
7375 Boston Boulevard, Building Ten	Office	Springfield, VA	—				23		2,685		1,007			93		3,622		—		—		3,715		2,261		1988	(1)
7451 Boston Boulevard, Building Two	Office	Springfield, VA	—				249		1,542		1,313			613		2,491		—		—		3,104		2,131		1982	(1)
32 Hartwell Avenue	Office	Lexington, MA	—				168		1,943		800			314		2,597		—		—		2,911		1,568		1968-1979/1987	(1)
164 Lexington Road	Office	Billerica, MA	—				592		1,370		319			643		1,638		—		—		2,281		703		1982	(1)
17 Hartwell Avenue	Office	Lexington, MA	—				26		150		1,002			65		1,113		—		—		1,178		639		1968	(1)
Residences on The Avenue, 2221 I St., NW	Residential	Washington, DC	—				—		119,874		(32		)	—		119,842		—		—		119,842		7,948		2011	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—				3,529		54,891		1,543			3,529		56,434		—		—		59,963		3,591		2011	(1)
Cambridge Center Marriott	Hotel	Cambridge, MA	—				478		37,918		35,981			1,201		73,176		—		—		74,377		47,182		1986	(1)
Cambridge Center East Garage	Garage	Cambridge, MA	—				—		35,035		1,487			103		36,419		—		—		36,522		6,684		1984	(1)
Cambridge Center West Garage	Garage	Cambridge, MA	—				1,256		15,697		1,553			1,434		17,072		—		—		18,506		3,364		2006	(1)
Cambridge Center North Garage	Garage	Cambridge, MA	—				1,163		11,633		1,085			1,163		12,718		—		—		13,881		8,157		1990	(1)
250 West 55th Street	Development	New York, NY	—				—		—		818,243			16,305		45,476		—		756,462		818,243		483		N/A	N/A
Transbay Tower	Development	San Francisco, CA	—				—		—		255,406			—		—		—		255,406		255,406		—		N/A	N/A
680 Folsom Street	Development	San Francisco, CA	—				—		—		241,093			—		—		3,475		237,618		241,093		—		N/A	N/A
601 Massachusetts Avenue	Development	Washington, DC	—				—		—		121,694			—		—		—		121,694		121,694		—		N/A	N/A
535 Mission Street	Development	San Francisco, CA	—				—		—		113,274			—		—		—		113,274		113,274		—		N/A	N/A
The Avant at Reston Town Center Residential	Development	Reston, VA	—				—		—		107,022			12,741		55,701		—		38,580		107,022		160		N/A	N/A
Springfield Metro Center	Land	Springfield, VA	—				—		—		32,073			—		—		32,073		—		32,073		—		N/A	N/A
Plaza at Almaden	Land	San Jose, CA	—				—		—		29,003			—		—		29,003		—		29,003		—		N/A	N/A
Tower Oaks Master Plan	Land	Rockville, MD	—				—		—		28,976			—		—		28,976		—		28,976		—		N/A	N/A
Reston Signature Site	Land	Reston, VA	—				—		—		27,890			—		—		27,890		—		27,890		—		N/A	N/A
Prospect Hill	Land	Waltham, MA	—				—		—		24,197			—		667		23,530		—		24,197		—		N/A	N/A
Washingtonian North	Land	Gaithersburg, MD	—				—		—		18,290			—		—		18,290		—		18,290		—		N/A	N/A
6601 & 6605 Springfield Center Drive	Land	Springfield, VA	—				—		—		13,866			—		—		13,866		—		13,866		—		N/A	N/A
Waltham Office Center	Land	Waltham, MA	—				—		—		12,716			165		8,445		4,106		—		12,716		8,063		N/A	N/A
103 4th Avenue	Land	Waltham, MA	—				—		—		11,918			—		—		11,918		—		11,918		—		N/A	N/A
Cambridge Master Plan	Land	Cambridge, MA	—				—		—		11,153			—		—		11,153		—		11,153		—		N/A	N/A
Reston Gateway	Land	Reston, VA	—				—		—		9,682			—		—		9,682		—		9,682		—		N/A	N/A
Reston Eastgate	Land	Reston, VA	—				—		—		8,807			—		—		8,807		—		8,807		—		N/A	N/A
Crane Meadow	Land	Marlborough, MA	—				—		—		8,725			—		—		8,725		—		8,725		—		N/A	N/A
Broad Run Business Park	Land	Loudon County, VA	—				—		—		7,888			1,621		—		6,267		—		7,888		—		N/A	N/A
30 Shattuck Road	Land	Andover, MA	—				—		—		1,212			—		—		1,212		—		1,212		—		N/A	N/A
			$	4,449,734	(2	)	$	4,303,172	$	10,631,057	$	4,019,372		$	4,450,532	$	12,682,514	$	297,376	$	1,523,179	$	18,953,601	$	3,145,701

__________________

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $25,164. Accumulated Depreciation does not include approximately $15,870 of accumulated depreciation related to Furniture, Fixtures and Equipment.

The aggregate cost and accumulated depreciation for tax purposes was approximately $14.8 billion and $2.6 billion, respectively.

(1) Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2) Includes the unamortized balance of the historical fair value adjustment totaling approximately $191.2 million.

Boston Properties, Inc.

Real Estate and Accumulated Depreciation

December 31, 2013

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2013			2012			2011
Real Estate:
Balance at the beginning of the year	$	14,869,887		$	13,363,113		$	12,740,892
Additions to/improvements of real estate	4,410,622			1,602,583			668,084
Assets sold/written-off	(326,908		)	(95,809		)	(45,863		)
Balance at the end of the year	$	18,953,601		$	14,869,887		$	13,363,113
Accumulated Depreciation:
Balance at the beginning of the year	$	2,919,479		$	2,626,324		$	2,308,665
Depreciation expense	419,908			367,625			362,636
Assets sold/written-off	(193,686		)	(74,470		)	(44,977		)
Balance at the end of the year	$	3,145,701		$	2,919,479		$	2,626,324

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

XML

Deferred Charges (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Charges [Abstract]
Leasing costs, including lease related intangibles	$ 1,183,204	$ 790,740
Financing costs	76,798	90,682
Deferred charges, gross	1,260,002	881,422
Less: Accumulated amortization	(375,552)	(293,187)
Deferred charges, total	$ 884,450	$ 588,235

XML

Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Y	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Probable Sale Term of Property After Classified As Held For Sale (Years)	1
Maximum Period After Construction The Company Considers A Construction Project As Substantially Completed (In Years)	1
Interest costs capitalized	$ 68,152,000	$ 44,278,000	$ 48,178,000
Salaries And Related Costs Capitalized	7,700,000	7,100,000	6,500,000
Cash FDIC Insured Limit	250,000
Separate Unrestricted Cash For Deferred Compensation Plan.	16,600,000	12,200,000
Gains (losses) from investments in securities	2,911,000	1,389,000	(443,000)
Internal Leasing Salaries And Related Costs Capitalized	5,100,000	5,600,000	4,400,000
Straight-line rent adjustments	(65,800,000)	(77,600,000)	(77,000,000)
Above and below market rent adjustments, net	28,000,000	14,600,000	10,800,000
Ground Lease Expiration Date, Maximum	2068
REIT Annual Taxable Income Distribution Requirement Percentage, Minimum	90.00%
Company Annual Taxable Income Distribution Percentage	100.00%
Net Difference Between Tax Basis And Company's Assets And Liabilities.	1,700,000,000	800,000,000
Misstatement of real estate operating expense	3,200,000
Interest and Other Income	8,310,000	10,091,000	5,358,000
Reclassification between general and administrative expense and real estate operating expenses	$ 8,100,000	$ 7,700,000	$ 7,500,000

XML

Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	December 31, 2013					December 31, 2012
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,449,734		$	4,545,283	$	3,102,485		$	3,256,940
Mezzanine notes payable	311,040			311,064		—			—
Unsecured senior notes	5,835,854			6,050,517		4,639,528			5,162,486
Unsecured exchangeable senior notes	744,880		(1)	750,266		1,170,356		(1)	1,278,554
Total	$	11,341,508		$	11,657,130	$	8,912,369		$	9,697,980

 _______________

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million and $25.5 million at December 31, 2013 and December 31, 2012, respectively.

Gaap Reconciliation Of Net Income To Taxable Income, Table [Table Text Block]

The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	749,811		$	289,650		$	272,679
Straight-line rent adjustments	(74,445		)	(80,281		)	(77,422		)
Book/Tax differences from depreciation and amortization	170,370			105,599			117,675
Book/Tax differences on gains/losses from capital transactions	(124,413		)	(22,408		)	(38,443		)
Book/Tax differences from stock-based compensation	42,146			19,660			827
Other book/tax differences, net	(12,797		)	35,461			29,389
Taxable income	$	750,672		$	347,681		$	304,705

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table summarizes the scheduled amortization of the Company's acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2014	$	23,669	$	61,700
2015	22,758		55,207
2016	20,576		52,461
2017	12,279		40,346
2018	8,637		37,774

The following table summarizes the scheduled amortization of the Company's acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2014	$	91,903
2015	66,716
2016	55,083
2017	41,106
2018	36,306

Schedule Of Future Contractual Minimum Lease Payments Under Non-Cancelable Ground Leases [Table Text Block]

Years Ending December 31,	(in thousands)
2014	$	13,184
2015	13,507
2016	13,732
2017	13,963
2018	14,198
Thereafter	899,187

Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes, Table [Table Text Block]

The tax treatment of common dividends per share for federal income tax purposes is as follows:

	For the year ended December 31,
	2013					2012						2011
	Per Share			%		Per Share			%			Per Share			%
Ordinary income	$	2.31		48.71	%	$	2.29	0.5839	96.45	%	0.9093	$	2.06	0.9093	97.39	%
Capital gain income	2.44			51.29	%	0.08		—	3.55	%	—	0.05		—	2.61	%
Total	$	4.75	(1)	100.00	%	$	2.37		100.00	%		$	2.11	1	100.00	%

(1) The fourth quarter 2013 dividend of $2.90 per common share consists of a $2.25 per common share special dividend and a $0.65 per common share regular quarterly dividend of which approximately $2.44 per common share was allocable to 2013 and approximately $0.46 per common share is allocable to 2014.

Property, Plant and Equipment [Table Text Block]

Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:

Land improvements	25 to 40 years
Buildings and improvements	10 to 40 years
Tenant improvements	Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment	3 to 7 years

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Real Estate (Tables)

12 Months Ended

Dec. 31, 2013

Real Estate Properties [Line Items]

Schedule of Property Subject to or Available for Operating Lease [Table Text Block]

Real estate consisted of the following at December 31 (in thousands):

	2013			2012
Land	$	4,450,532		$	2,605,162
Land held for future development	297,376			275,094
Buildings and improvements	11,065,113			9,517,343
Tenant improvements	1,617,401			1,435,508
Furniture, fixtures and equipment	25,164			23,441
Construction in progress	1,523,179			1,036,780
Total	18,978,765			14,893,328
Less: Accumulated depreciation	(3,161,571		)	(2,934,160		)
	$	15,817,194		$	11,959,168

Pro Forma In Connection With Acquisition

The accompanying unaudited pro forma information for the years ended December 31, 2013 and 2012 is presented as if the operating property acquisitions of (1) Mountain View Research Park and Mountain View Technology Park on April 10, 2013 and the approximately $26.5 million gain on consolidation and (2) 767 Fifth Avenue (the General Motors Building) on May 31, 2013 and the approximately $359.5 million gain on consolidation, had occurred on January 1, 2012. This unaudited pro forma information is based upon the historical consolidated financial statements of the Company and should be read in conjunction with the consolidated financial statements and notes thereto. This pro forma information does not purport to represent what the actual results of operations of the Company would have been had the above occurred, nor do they purport to predict the results of operations of future periods.

Pro Forma (Unaudited)	Year ended December 31,
(in thousands, except per share data)	2013		2012
Total revenue	$	2,257,098	$	2,149,391
Income from continuing operations	$	302,354	$	634,457
Net income attributable to Boston Properties, Inc.	$	400,017	$	626,174
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	2.58	$	4.15
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	2.57	$	4.13

Summary Of The Discontinued Operations

The following table summarizes the income from discontinued operations related to One Preserve Parkway, 10 & 20 Burlington Mall Road, 1301 New York Avenue, 303 Almaden Boulevard, Montvale Center and Bedford Business Park and the related gains on sales of real estate, gain on forgiveness of debt and impairment loss for the years ended December 31, 2013, 2012 and 2011:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Total revenue	$	20,138		$	32,607		$	36,734
Expenses
Operating	6,996			12,038			13,818
Depreciation and amortization	4,760			8,169			9,442
Total expenses	11,756			20,207			23,260
Operating income	8,382			12,400			13,474
Other expense
Interest expense	360			2,594			2,598
Income from discontinued operations	$	8,022		$	9,806		$	10,876
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership	(803		)	(1,031		)	(1,243		)
Income from discontinued operations attributable to Boston Properties, Inc.	$	7,219		$	8,775		$	9,633
Gains on sales of real estate from discontinued operations	$	112,829		$	36,877		$	—
Gain on forgiveness of debt from discontinued operations	20,182			—			—
Impairment loss from discontinued operations	(3,241		)	—			—
Noncontrolling interest in gains on sales of real estate, gain on forgiveness of debt and impairment loss from discontinued operations – common units of the Operating Partnership	(13,348		)	(4,044		)	—
Gains on sales of real estate, gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	116,422		$	32,833		$	—

Mountain View Research And Technology Parks [Member]

Real Estate Properties [Line Items]

Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition

The following table summarizes the allocation of the aggregate purchase price of Mountain View Research Park and Mountain View Technology Park at the date of acquisition (in thousands) in accordance with the guidance in ASC 805 "Business Combinations."

Land	$	126,521
Building and improvements	82,451
Tenant improvements	7,326
In-place lease intangibles	23,279
Above-market rents	843
Below-market rents	(7,336		)
Net assets acquired	$	233,084

767 5th Avenue (The General Motors Building) [Member]

Real Estate Properties [Line Items]

Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition

The following table summarizes the allocation of the aggregate purchase price of 767 Fifth Avenue (the General Motors Building) at the date of consolidation on May 31, 2013 (in thousands) in accordance with the guidance in ASC 805 "Business Combinations."

.

Real estate and related intangibles recorded upon consolidation
Land	$	1,796,252
Building and improvements	1,447,446
Tenant improvements	85,208
In-place lease intangibles	357,781
Above market rents	101,897
Below market rents	(239,641		)
Above market assumed debt adjustments	(192,943		)
	$	3,356,000
Debt recorded upon consolidation
Mortgage notes payable	$	(1,300,000	)
Mezzanine notes payable	(306,000		)
Members' notes payable	(450,000		)	(1)
	$	(2,056,000	)
Working capital recorded upon consolidation
Cash and cash equivalents	$	79,468
Cash held in escrows	2,403
Tenant and other receivables	7,104
Prepaid expenses and other assets	4,269
Accounts payable and accrued expenses	(2,418		)
Accrued interest payable	(182,369		)	(2)
Other liabilities	(6,304		)
	$	(97,847	)
Noncontrolling interest recorded upon consolidation
Noncontrolling interests	$	(520,000	)
Noncontrolling interests - working capital	39,139
	$	(480,861	)
Net assets recorded upon consolidation	$	721,292

_______________

(1) The Company's member loan totaling $270.0 million eliminates in consolidation.

(2) The Company's share of the accrued interest payable on the members' loans totaling approximately $105.5 million eliminates in consolidation.

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Organization

12 Months Ended

Dec. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Organization

Boston Properties, Inc. (the “Company”), a Delaware corporation, is a self-administered and self-managed real estate investment trust (“REIT”). The Company is the sole general partner of Boston Properties Limited Partnership (the “Operating Partnership”) and at December 31, 2013 owned an approximate 89.5% (89.0% at December 31, 2012) general and limited partnership interest in the Operating Partnership. Partnership interests in the Operating Partnership are denominated as “common units of partnership interest” (also referred to as “OP Units”), “long term incentive units of partnership interest” (also referred to as “LTIP Units”) or “preferred units of partnership interest” (also referred to as “Preferred Units”). In addition, in February 2011 and February 2012, the Company issued LTIP Units in connection with the granting to employees of outperformance awards (also referred to as “2011 OPP Units” and “2012 OPP Units,” respectively, and collectively as “OPP Units”). In February 2013, the Company issued LTIP Units in connection with the granting to employees of 2013 MYLTIP Units (“2013 MYLTIP Units”). Because the rights, preferences and privileges of OPP Units and 2013 MYLTIP Units differ from other LTIP Units granted to employees as part of the annual compensation process, unless specifically noted otherwise, all references to LTIP Units exclude OPP Units and 2013 MYLTIP Units (See Notes 11 and 17).

Unless specifically noted otherwise, all references to OP Units exclude units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership is obligated to redeem such OP Unit for cash equal to the value of a share of common stock of the Company (“Common Stock”) at such time. In lieu of a cash redemption, the Company may elect to acquire such OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that the Company owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock. An LTIP Unit is generally the economic equivalent of a share of restricted common stock of the Company. LTIP Units, whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Note 12).

At December 31, 2013, there were three series of Preferred Units outstanding (i.e., Series Two Preferred Units, Series Four Preferred Units and Series B Preferred Units).

• The Series Two Preferred Units bear a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Each Series Two Preferred Unit may also be converted into approximately 1.312336 OP Units or redeemed for $50.00 of cash at the election of the holder thereof or the Operating Partnership in accordance with the terms and conditions set forth in the applicable amendment to the partnership agreement (See Note 11).

• The Series Four Preferred Units are not convertible into or exchangeable for any common equity of the Operating Partnership or the Company, have a per unit liquidation preference of $50.00 and are entitled to receive quarterly distributions of $0.25 per unit (or an annual rate of 2.00%) (See Note 11).

• The Series B Preferred Units were issued to the Company on March 27, 2013 in connection with the Company's issuance of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of 5.25% Series B Cumulative Redeemable Preferred Stock (the "Series B Preferred Stock"). The Company contributed the net proceeds from the offering to the Operating Partnership in exchange for 80,000 Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock (See Note 12).

All references herein to the Company refer to Boston Properties, Inc. and its consolidated subsidiaries, including the Operating Partnership, collectively, unless the context otherwise requires.

Properties

At December 31, 2013, the Company owned or had interests in a portfolio of 175 commercial real estate properties (the “Properties”) aggregating approximately 44.4 million net rentable square feet, including nine properties under construction totaling approximately 2.9 million net rentable square feet. In addition, the Company has structured parking for approximately 45,234 vehicles containing approximately 15.4 million square feet. At December 31, 2013, the Properties consist of:

• 167 office properties, including 128 Class A office properties (including eight properties under construction) and 39 Office/Technical properties;

• one hotel;

• four retail properties; and

• three residential properties (including one property under construction).

The Company owns or controls undeveloped land parcels totaling approximately 503.6 acres.

The Company considers Class A office properties to be centrally located buildings that are professionally managed and maintained, attract high-quality tenants and command upper-tier rental rates, and that are modern structures or have been modernized to compete with newer buildings. The Company considers Office/Technical properties to be properties that support office, research and development, laboratory and other technical uses. The Company’s definitions of Class A Office and Office/Technical properties may be different than those used by other companies. Net rentable square feet amounts are unaudited.

Basis of Presentation

Boston Properties, Inc. does not have any other significant assets, liabilities or operations, other than its investment in the Operating Partnership, nor does it have employees of its own. The Operating Partnership, not Boston Properties, Inc., executes all significant business relationships. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities ("VIE"s) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.

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Deferred Charges (Tables)

12 Months Ended

Dec. 31, 2013

Deferred Charges [Abstract]

Deferred Charges

Deferred charges consisted of the following at December 31, (in thousands):

	2013			2012
Leasing costs, including lease related intangibles	$	1,183,204		$	790,740
Financing costs	76,798			90,682
	1,260,002			881,422
Less: Accumulated amortization	(375,552		)	(293,187		)
	$	884,450		$	588,235

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table summarizes the scheduled amortization of the Company's acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).

	Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
2014	$	23,669	$	61,700
2015	22,758		55,207
2016	20,576		52,461
2017	12,279		40,346
2018	8,637		37,774

The following table summarizes the scheduled amortization of the Company's acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2014	$	91,903
2015	66,716
2016	55,083
2017	41,106
2018	36,306

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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc., Income (Numerator)									$ 618,113	$ 248,042	$ 263,046
Net income attributable to Boston Properties Inc., Shares (Denominator)									152,201	150,120	145,693
Income from continuing operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share)									$ 4.06	$ 1.65	$ 1.80
Discontinued operations attributable to Boston Properties, Inc., Income (Numerator)									123,641	41,608	9,633
Discontinued operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share)									$ 0.81	$ 0.28	$ 0.07
Net Income Loss Available To Boston Properties, Inc. Common Stockholders									741,594	289,650	272,679
Allocation of undistributed earnings to participating securities									(160)
Allocation of undistributed earnings to participating securities (in shares)									$ 0.00
Net income attributable to Boston Properties Inc., Per Share Amount (in dollars per share)	$ 0.58	$ 1.00	$ 2.95	$ 0.32	$ 0.43	$ 0.38	$ 0.79	$ 0.33	$ 4.87	$ 1.93	$ 1.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes, Income (Numerator)									0	0	0
Stock Based Compensation and Exchangeable Senior Notes, Shares (Denominator)									320	591	525
Stock Based Compensation and Exchangeable Senior Notes Per Share Amount									$ (0.01)	$ (0.01)	$ (0.01)
Diluted Earnings:
Diluted Earnings: Net income, Income (Numerator)									$ 741,594	$ 289,650	$ 272,679
Diluted Earnings: Net income, Shares (Denominator)									152,521	150,711	146,218
Diluted Earnings: Net income, Per Share Amount (in dollars per share)	$ 0.58	$ 1.00	$ 2.94	$ 0.31	$ 0.43	$ 0.38	$ 0.78	$ 0.33	$ 4.86	$ 1.92	$ 1.86

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Share

	For the Year Ended December 31, 2013
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	618,113		152,201	$	4.06
Discontinued operations attributable to Boston Properties, Inc.	123,641			—	0.81
Allocation of undistributed earnings to participating securities	(160		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	741,594		152,201	$	4.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			320	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	741,594		152,521	$	4.86
	For the Year Ended December 31, 2012
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	248,042		150,120	$	1.65
Discontinued operations attributable to Boston Properties, Inc.	41,608			—	0.28
Net income attributable to Boston Properties, Inc. common shareholders	$	289,650		150,120	$	1.93
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			591	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	289,650		150,711	$	1.92

	For the Year Ended December 31, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	263,046	145,693	$	1.80
Discontinued operations attributable to Boston Properties, Inc.	9,633		—	0.07
Net income attributable to Boston Properties, Inc. common shareholders	$	272,679	145,693	$	1.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—		525	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	272,679	146,218	$	1.86

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Real Estate (Pro Forma In Connection With Acquisition) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Real Estate [Abstract]
Total revenue	$ 2,257,098	$ 2,149,391
Income from continuing operations	302,354	634,457
Net income attributable to Boston Properties, Inc.	$ 400,017	$ 626,174
Basic earnings per share: Net income per share attributable to Boston Properties, Inc. (in dollars per share)	$ 2.58	$ 4.15
Diluted earnings per share: Net income per share attributable to Boston Properties, Inc. (in dollars per share)	$ 2.57	$ 4.13

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Noncontrolling Interests (Redeemable Preferred Units) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance	$ 110,876
Net income	6,046	3,497	3,339
Redemption of redeemable preferred units (Series Four Preferred Units)	(43,070)	(18,329)	0
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	16,494	5,852
Ending Balance	51,312	110,876
Redeemable Preferred Units [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance	110,876	55,652	55,652
Issuance of redeemable preferred units (Series Four Preferred Units		79,405
Net income	6,046	3,497	3,339
Distributions	(6,046)	(3,497)	(3,339)
Redemption of redeemable preferred units (Series Four Preferred Units)	(43,070)	(18,329)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(16,494)	(5,852)
Ending Balance	$ 51,312	$ 110,876	$ 55,652

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Real estate, at cost	$ 18,978,765	$ 14,893,328
Less: accumulated depreciation	(3,161,571)	(2,934,160)
Total real estate	15,817,194	11,959,168
Cash and cash equivalents	2,365,137	1,041,978
Cash held in escrows	57,201	55,181
Investments in securities	16,641	12,172
Tenant and other receivables (net of allowance for doubtful accounts of $1,636 and $1,960, respectively)	59,464	69,555
Related party notes receivable	0	282,491
Interest receivable from related party notes receivable	0	104,816
Accrued rental income (net of allowance of $3,636 and $1,571, respectively)	651,603	598,199
Deferred charges, net	884,450	588,235
Prepaid expenses and other assets	184,477	90,610
Investments in unconsolidated joint ventures	126,084	659,916
Total assets	20,162,251	15,462,321
Liabilities:
Mortgage notes payable	4,449,734	3,102,485
Unsecured senior notes (net of discount of $14,146 and $10,472, respectively	5,835,854	4,639,528
Unsecured exchangeable senior notes (net of discount of $182 and $1,653, respectively)	744,880	1,170,356
Unsecured line of credit	0	0
Mezzanine notes payable	311,040	0
Outside members' notes payable	180,000	0
Accounts payable and accrued expenses	202,470	199,102
Dividends and distributions payable	497,242	110,488
Accrued interest payable	167,523	72,461
Other liabilities	578,969	324,613
Total liabilities	12,967,712	9,619,033
Commitments and contingencies	0	0
Noncontrolling interest:
Redeemable preferred units of the Operating Partnership	51,312	110,876
Redeemable interest in property partnerships	99,609	97,558
Equity:
Excess stock, $.01 par value, 150,000,000 shares authorized, none issued or outstanding	0	0
Preferred stock, $.01 par value, 50,000,000 shares authorized
5.25% Series B cumulative redeemable preferred stock, $.01 par value, liquidation preference $2,500 per share, 92,000 shares authorized, 80,000 and no shares issued and outstanding at December 31, 2013 and December 31, 2012, respectively	200,000	0
Common stock, $.01 par value, 250,000,000 shares authorized, 153,062,001 and 151,680,109 issued 152,983,101 and 151,601,209 outstanding at December 31, 2013 and December 31, 2012, respectively	1,530	1,516
Additional paid-in capital	5,662,453	5,222,073
Dividends in excess of earnings	(108,552)	(109,985)
Treasury common stock at cost, 78,900 shares at December 31, 2013 and December 31, 2012	(2,722)	(2,722)
Accumulated other comprehensive loss	(11,556)	(13,817)
Total stockholders' equity attributable to Boston Properties, Inc.	5,741,153	5,097,065
Noncontrolling interests:
Common units of the Operating Partnership	576,333	539,753
Property partnerships	726,132	(1,964)
Total equity	7,043,618	5,634,854
Total liabilities and equity	$ 20,162,251	$ 15,462,321

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Summary Of Significant Accounting Policies Schedule of Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2013
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	25 years
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	40 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	40 years
Tenant Improvement [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, description	Shorter of useful life or terms of related lease
Furniture, fixtures and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	3 years
Furniture, fixtures and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	7 years

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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-In Capital [Member]	Dividends In Excess Of Earnings [Member]	Treasury Stock, At Cost [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
Equity, value at Dec. 31, 2010	$ 4,964,193	$ 1,402		$ 4,417,162	$ (24,763)	$ (2,722)	$ (18,436)	$ 591,550
Equity, shares at Dec. 31, 2010		140,199,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units to Common Stock, shares		2,919,000
Conversion of operating partnership units to Common Stock, value	0	29		85,469				(85,498)
Allocated net income for the year	310,487				272,679			37,808
Dividends/distributions declared	(340,128)				(300,996)			(39,132)
Shares issued in connection with exchange of exchangeable senior notes, value	0
Sale of Common Stock, net of offering costs, shares		4,660,000
Sale of Common Stock, net of offering costs, value	439,037	47		438,990
Shares issued pursuant to stock purchase plan, shares		6,000
Shares issued pursuant to stock purchase plan, value	620			620
Net activity from stock option and incentive plan, shares		324,000
Net activity from stock option and incentive plan, value	38,719	3		17,289				21,427
Noncontrolling interest in property partnerships recorded upon consolidation	0
Distributions to noncontrolling interests in property partnerships	(2,007)							(2,007)
Amortization of interest rate contracts	2,595						2,298	297
Reallocation of noncontrolling interest	0			(23,073)				23,073
Equity, value at Dec. 31, 2011	5,413,516	1,481		4,936,457	(53,080)	(2,722)	(16,138)	547,518
Equity, shares at Dec. 31, 2011		148,108,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units to Common Stock, shares		1,111,000
Conversion of operating partnership units to Common Stock, value	0	11		34,610				(34,621)
Conversion of redeemable preferred units to common units	5,852							5,852
Allocated net income for the year	326,839				289,650			37,189
Dividends/distributions declared	(387,989)				(346,555)			(41,434)
Shares issued in connection with exchange of exchangeable senior notes, value	0
Sale of Common Stock, net of offering costs, shares		2,348,000
Sale of Common Stock, net of offering costs, value	247,027	24		247,003
Shares issued pursuant to stock purchase plan, shares		7,000
Shares issued pursuant to stock purchase plan, value	781			781
Net activity from stock option and incentive plan, shares		27,000
Net activity from stock option and incentive plan, value	29,124			5,419				23,705
Noncontrolling interest in property partnerships recorded upon consolidation	0
Distributions to noncontrolling interests in property partnerships	(2,890)							(2,890)
Amortization of interest rate contracts	2,594						2,321	273
Reallocation of noncontrolling interest	0			(2,197)				2,197
Equity, value at Dec. 31, 2012	5,634,854	1,516		5,222,073	(109,985)	(2,722)	(13,817)	537,789
Equity, shares at Dec. 31, 2012	151,601,209	151,601,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units to Common Stock, shares		929,000
Conversion of operating partnership units to Common Stock, value	0	10		30,281				(30,291)
Conversion of redeemable preferred units to common units	16,494							16,494
Allocated net income for the year	828,757				749,811			78,946
Dividends/distributions declared	(831,826)				(748,378)			(83,448)
Issuance of 5.25% Series B cumulative redeemable preferred stock	193,623		200,000	(6,377)
Shares issued in connection with exchange of exchangeable senior notes, value	43,834	4		43,830
Equity component of exchange of exchangeable senior notes	(43,869)			(43,869)
shares issued in connection with exchange of exchangeable senior notes, shares		419,000
Shares issued pursuant to stock purchase plan, shares		6,000
Shares issued pursuant to stock purchase plan, value	681			681
Net activity from stock option and incentive plan, shares		28,000
Net activity from stock option and incentive plan, value	35,571			7,701				27,870
Noncontrolling interest in property partnerships recorded upon consolidation	480,861							480,861
Sale of interest in property partnerships and contributions from noncontrolling interest in property partnerships	687,164			429,600				257,564
Distributions to noncontrolling interests in property partnerships	(5,039)							(5,039)
Amortization of interest rate contracts	2,513						2,261	252
Reallocation of noncontrolling interest	0			(21,467)				21,467
Equity, value at Dec. 31, 2013	$ 7,043,618	$ 1,530	$ 200,000	$ 5,662,453	$ (108,552)	$ (2,722)	$ (11,556)	$ 1,302,465
Equity, shares at Dec. 31, 2013	152,983,101	152,983,000

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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
ASSETS
Real estate and development in process, net	$ 15,817,194		$ 11,959,168
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable	4,449,734		3,102,485
Other liabilities	578,969		324,613
Total liabilities and equity	20,162,251		15,462,321
Carrying value of the Company's investments in unconsolidated joint ventures	126,084		659,916
Unconsolidated Joint Ventures [Member]
ASSETS
Real estate and development in process, net	924,297		4,494,971
Other assets	163,149		673,716
Total assets	1,087,446		5,168,687
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable	749,732		3,039,922
Other liabilities	28,830		792,888
Members'/Partners' equity	308,884		1,335,877
Total liabilities and equity	1,087,446		5,168,687
Company's share of equity	154,726		787,941
Basis differentials	(28,642)	[1]	(128,025)	[1]
Carrying value of the Company's investments in unconsolidated joint ventures	$ 126,084		$ 659,916

[1] This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.

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Unsecured Senior Notes (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Schedule of Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate		Effective Rate(1)		Principal Amount			Maturity Date(2)
12 Year Unsecured Senior Notes	5.625	%	5.693	%	$	300,000		April 15, 2015
12 Year Unsecured Senior Notes	5.000	%	5.194	%	250,000			June 1, 2015
10 Year Unsecured Senior Notes	5.875	%	5.967	%	700,000			October 15, 2019
10 Year Unsecured Senior Notes	5.625	%	5.708	%	700,000			November 15, 2020
10 Year Unsecured Senior Notes	4.125	%	4.289	%	850,000			May 15, 2021
7 Year Unsecured Senior Notes	3.700	%	3.853	%	850,000			November 15, 2018
11 Year Unsecured Senior Notes	3.850	%	3.954	%	1,000,000			February 1, 2023
10.5 Year Unsecured Senior Notes	3.125	%	3.279	%	500,000			September 1, 2023
10.5 Year Unsecured Senior Notes	3.800	%	3.916	%	700,000			February 1, 2024
Total principal					5,850,000
Net unamortized discount					(14,146		)
Total					$	5,835,854

 _______________

(1) Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.

(2) No principal amounts are due prior to maturity.

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Unsecured Senior Notes Unsecured Senior Notes (Narrative) (Details) (USD $)	12 Months Ended				0 Months Ended		12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Apr. 11, 2013 Three Point Two Seven Nine Percent Unsecured Senior Notes [Member]	Jun. 27, 2013 Three Point Nine One Six Percent Unsecured Senior Notes [Member]	Dec. 31, 2013 Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 500,000,000	$ 700,000,000
Coupon/Stated Rate	3.625%				3.125%	3.80%
Senior Notes Pricing					99.379%	99.694%
Effective Rate	4.037%	[1]			3.279%	3.916%
Maturity date	Feb. 15, 2014				Sep. 01, 2023	Feb. 01, 2024
Proceeds from unsecured senior notes	$ 1,194,753,000		$ 997,790,000	$ 848,019,000	$ 492,500,000	$ 691,900,000
Maximum Leverage Ratio							60.00%
Maximum Secured Debt Leverage Ratio	55.00%						50.00%
Minimum Interest Coverage Ratio							1.50
Minimum Unencumbered Asset Value Percentage Of Unsecured Debt							150.00%

[1] Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

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Earnings Per Share

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. by the weighted-average number of common shares outstanding during the period. The terms of the Series Two Preferred Units enable the holders to obtain OP Units of the Operating Partnership, as well as Common Stock of the Company, and as a result these are considered participating securities. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of the Company, LTIP Units, OPP Units and 2013 MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of the Company using the two-class method. Participating securities are included in the computation of diluted EPS of the Company using the if-converted method if the impact is dilutive. Because the OPP Units and 2013 MYLTIP Units require the Company to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of the Operating Partnership that are exchangeable for the Company’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.

	For the Year Ended December 31, 2013
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	618,113		152,201	$	4.06
Discontinued operations attributable to Boston Properties, Inc.	123,641			—	0.81
Allocation of undistributed earnings to participating securities	(160		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	741,594		152,201	$	4.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			320	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	741,594		152,521	$	4.86
	For the Year Ended December 31, 2012
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	248,042		150,120	$	1.65
Discontinued operations attributable to Boston Properties, Inc.	41,608			—	0.28
Net income attributable to Boston Properties, Inc. common shareholders	$	289,650		150,120	$	1.93
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			591	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	289,650		150,711	$	1.92

	For the Year Ended December 31, 2011
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	263,046	145,693	$	1.80
Discontinued operations attributable to Boston Properties, Inc.	9,633		—	0.07
Net income attributable to Boston Properties, Inc. common shareholders	$	272,679	145,693	$	1.87
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—		525	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	272,679	146,218	$	1.86

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Unsecured Exchangeable Senior Notes (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Schedule of Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate		Effective Rate (1)		Exchange Rate		Principal Amount			First Optional Redemption Date by the Company	Maturity Date
3.625% Exchangeable Senior Notes	3.625	%	4.037	%	8.6974	(2)	$	747,500		N/A	February 15, 2014
Net unamortized discount							(182		)
Adjustment for the equity component allocation, net of accumulated amortization							(2,438		)
Total							$	744,880

 _______________

(1) Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustments), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. In connection with the special dividend declared on November 27, 2013, the exchange rate of 8.5051 was adjusted to 8.6974 shares per $1,000 principal amount of notes effective as of December 31, 2013, resulting in an exchange price of approximately $114.98 per share of Boston Properties, Inc.'s common stock. As of December 31, 2013, the effective exchange price was $130.21 per share. The Operating Partnership repaid the notes on February 18, 2014 (See Note 20).

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Stock Option and Incentive Plan

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option and Incentive Plan

Stock Option and Incentive Plan

At the Company's 2012 annual meeting of stockholders held on May 15, 2012, the stockholders of the Company approved the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”). The 2012 Plan replaced the 1997 Stock Option and Incentive Plan (the “1997 Plan”). The material terms of the 2012 Plan include, among other things: (1) the maximum number of shares of common stock reserved and available for issuance under the 2012 Plan is the sum of (i) 13,000,000 newly authorized shares, plus (ii) the number of shares available for grant under the 1997 Stock Plan immediately prior to the effective date of the 2012 Plan, plus (iii) any shares underlying grants under the 1997 Plan that are forfeited, cancelled or terminated (other than by exercise) in the future; (2) “full-value” awards (i.e., awards other than stock options) are multiplied by a 2.32 conversion ratio to calculate the number of shares available under the 2012 Plan that are used for each full-value award, as opposed to a 1.0 conversion ratio for each stock option awarded under the 2012 Plan; (3) shares tendered or held back for taxes will not be added back to the reserved pool under the 2012 Plan; (4) stock options may not be re-priced without stockholder approval; and (5) the term of the 2012 Plan is for ten years from the date of stockholder approval.

On January 28, 2013, the Company's Compensation Committee approved multi-year long-term incentive program (MYLTIP) awards under the Company's 2012 Plan to officers and employees of the Company. MYLTIP awards utilize total return to shareholders ("TRS") over a three-year measurement period, on an annualized, compounded basis, as the performance metric. Earned awards will be based on the Company's TRS relative to (i) the Cohen & Steers Realty Majors Portfolio Index (50% weight) and (ii) the NAREIT Office Index adjusted to exclude the Company (50% weight). Earned awards will range from zero to a maximum of approximately $30.7 million depending on the Company's TRS relative to the two indices, with four tiers (threshold: approximately $5.1 million; target: approximately $10.2 million; high: approximately $20.5 million; exceptional: approximately $30.7 million) and linear interpolation between tiers. Earned awards measured on the basis of relative TRS performance are subject to an absolute TRS component in the form of relatively simple modifiers that (A) reduce the level of earned awards in the event the Company's annualized TRS is less than 2% and (B) cause some awards to be earned in the event the Company's annualized TRS is more than 10% even though on a relative basis alone the Company's TRS would not result in any earned awards.

Earned awards (if any) will vest 25% on February 4, 2016, 25% on February 4, 2017 and 50% on February 4, 2018, based on continued employment. Vesting will be accelerated in the event of a change in control, termination of employment by the Company without cause, termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to February 4, 2016, earned awards will be calculated based on TRS performance up to the date of the change of control. MYLTIP awards are in the form of LTIP Units issued on the grant date which (i) are subject to forfeiture to the extent awards are not earned and (ii) prior to the performance measurement date are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units.

On March 11, 2013, the Company announced that Owen D. Thomas would succeed Mortimer B. Zuckerman as the Company's Chief Executive Officer, effective April 2, 2013. On April 2, 2013, the Company issued 24,231 LTIP units, 38,926 2013 MYLTIP Units and 50,847 non-qualified stock options under the 2012 Plan to Mr. Thomas, pursuant to his employment agreement. Mr. Zuckerman will continue to serve as Executive Chairman for a transition period and thereafter is expected to continue to serve as the Non-Executive Chairman of the Board.  In connection with succession planning, the Company and Mr. Zuckerman entered into a Transition Benefits Agreement. If Mr. Zuckerman remains employed by the Company through July 1, 2014, he will be entitled to receive on January 1, 2015 a lump sum cash payment of $6.7 million and an equity award with a targeted value of approximately $11.1 million. The cash payment and equity award vest one-third on each of March 10, 2013, October 1, 2013 and July 1, 2014, subject to acceleration in certain circumstances. As a result, the Company recognized approximately $13.8 million of compensation expense during the year ended December 31, 2013. In addition, the agreement provides that if Mr. Zuckerman terminates his employment with the Company for any reason, voluntarily or involuntarily, he will become fully vested in any outstanding equity awards with time-based vesting. As a result, during the year ended December 31, 2013, the Company accelerated the remaining approximately $12.9 million of stock-based compensation expense associated with Mr. Zuckerman's unvested long-term equity awards.

Under the Financial Accounting Standards Board's Accounting Standards Codification (“ASC”) 718 “Compensation-Stock Compensation” the MYLTIP awards granted to employees in February 2013 and granted to Mr. Thomas in April 2013 have an aggregate value of approximately $9.2 million, which amount will generally be amortized into earnings over the five-year plan period under the graded vesting method.

The Company issued 36,730, 20,756 and 19,030 shares of restricted common stock and 184,733, 174,650 and 190,067 LTIP Units to employees and non-employee directors under the 1997 Plan and 2012 Plan during the years ended December 31, 2013, 2012 and 2011. The Company issued 252,220, 186,007 and 146,844 non-qualified stock options under the 1997 Plan during the years ended December 31, 2013, 2012 and 2011. The amounts issued during 2013 include the amounts issued to Mr. Thomas pursuant to his employment agreement, as discussed above. The Company issued 400,000 2011 OPP Units to employees under the 1997 Plan during the year ended December 31, 2011. The Company issued 400,000 2012 OPP Units to employees under the 1997 Plan during the year ended December 31, 2012. The Company issued 318,926 2013 MYLTIP Units to employees under the 2012 Plan during the year ended December 31, 2013, including the amounts issued to Mr. Thomas pursuant to his employment agreement, as discussed above. Employees and directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit, OPP Unit and 2013 MYLTIP Unit. An LTIP Unit is generally the economic equivalent of a share of restricted stock in the Company. The aggregate value of the LTIP Units is included in noncontrolling interests in the Consolidated Balance Sheets. Grants of restricted stock and LTIP Units to employees vest in four equal annual installments. Restricted stock is measured at fair value on the date of grant based on the number of shares granted, as adjusted for forfeitures, and the closing price of the Company’s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. Non-qualified stock options, which are valued using the Black-Scholes option-pricing model, are recognized as an expense ratably over the corresponding employee service period. As the 2011 OPP Awards, 2012 OPP Awards and 2013 MYLTIP Awards are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2011 OPP Awards, 2012 OPP Awards and 2013 MYLTIP Awards under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in the Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, non-qualified stock options, LTIP Units, 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units was approximately $43.9 million, $28.3 million and $28.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. For the year ended December 31, 2013, stock-based compensation expense includes approximately $21.5 million consisting of the acceleration of the expense of the Company’s Executive Chairman’s stock-based compensation awards and the stock-based compensation awards associated with his transition benefits agreement related to the Company's succession planning. For the year ended December 31, 2012, stock-based compensation expense includes approximately $2.7 million consisting of the acceleration of vesting of the Company’s Chief Operating Officer’s stock-based compensation awards associated with his resignation. Upon the conclusion of the three-year measurement period in February 2011, the 2008 OPP Awards were not earned, the program was terminated and the Company accelerated the then remaining unrecognized compensation expense totaling approximately $4.3 million during the year ended December 31, 2011. At December 31, 2013, there was $17.6 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $11.1 million of unrecognized compensation expense related to unvested 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.7 years (See Note 20).

The shares of restricted stock were valued at approximately $3.9 million ($105.30 per share weighted-average), $2.2 million ($107.31 per share weighted-average) and $1.8 million ($93.40 per share weighted-average) for the years ended December 31, 2013, 2012 and 2011, respectively.

LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of ASC 718 “Compensation—Stock Compensation” (“ASC 718”). LTIP Units issued during the years ended December 31, 2013, 2012 and 2011 were valued at approximately $17.8 million, $17.3 million and $16.5 million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2013, 2012 and 2011 was $96.13, $98.83 and $86.74, respectively. The per unit fair value of each LTIP Unit granted in 2013, 2012 and 2011 was estimated on the date of grant using the following assumptions; an expected life of 5.7 years, 5.8 years and 5.8 years, a risk-free interest rate of 1.03%, 0.94% and 2.22% and an expected price volatility of 26.0%, 29.1% and 30.0%, respectively.

The non-qualified stock options granted during the years ended December 31, 2013, 2012 and 2011 had a weighted-average fair value on the date of grant of $18.46, $19.50 and $24.67 per option, respectively, which was computed using the Black-Scholes option-pricing model utilizing the following assumptions: an expected life of 6.0 years, 5.4 years and 6.0 years, a risk-free interest rate of 1.11%, 0.92% and 2.37%, an expected price volatility of 26.0%, 28.4% and 35.0% and an expected dividend yield of 3.0%, 2.9% and 3.0%, respectively. The exercise price of the options granted during the years ended December 31, 2013, 2012 and 2011 where $105.10, $107.23 and $92.71, respectively, which was the closing price of the Company’s common stock on the date of grant.

A summary of the status of the Company’s stock options as of December 31, 2013, 2012 and 2011 and changes during the years then ended are presented below:

	Shares		Weighted Average Exercise Price
Outstanding at December 31, 2010	324,938		$	32.65
Granted	146,844		$	92.71
Exercised	(316,159	)	$	32.63
Canceled	—		$	—
Outstanding at December 31, 2011	155,623		$	89.35
Granted	186,007		$	107.23
Exercised	(22,823	)	$	72.42
Canceled	(24,280	)	$	100.15
Outstanding at December 31, 2012	294,527		$	101.06
Granted	252,220		$	104.50
Exercised	—		$	—
Canceled	—		$	—
Special dividend adjustment	12,076		$	100.44
Outstanding at December 31, 2013	558,823		$	100.43

The following table summarizes information about stock options outstanding at December 31, 2013:

Options Outstanding						Options Exercisable
Exercise Prices		Number Outstanding at 12/31/13	Remaining Contractual Life	Exercise Price		Number Exercisable at 12/31/13	Exercise Price
$	90.71	131,837	7.1 years	$	90.71	80,240	$	90.71
$	99.94	51,971	9.3 years	$	99.94	—	$	—
$	102.83	205,821	9.1 years	$	102.83	48,026	$	102.83
$	105.25	169,194	8.1 years	$	105.25	71,602	$	105.25

The total intrinsic value of the outstanding and exercisable stock options as of December 31, 2013 was approximately$0.8 million. In addition, the Company had 91,496 and 13,633 options exercisable at a weighted-average exercise price of $98.92 and $54.32 at December 31, 2012 and 2011, respectively.

The Company adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the “Stock Purchase Plan”) to encourage the ownership of Common Stock by eligible employees. The Stock Purchase Plan became effective on January 1, 1999 with an aggregate maximum of 250,000 shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to purchase on the business day immediately following the end of the biannual purchase periods (i.e., January 1-June 30 and July 1-December 31) shares of Common Stock at a purchase price equal to 85% of the average closing prices of the Common Stock during the last ten business days of the purchase period. The Company issued 6,442, 7,406 and 6,356 shares with the weighted average purchase price equal to $89.65 per share, $86.52 per share and $80.13 per share under the Stock Purchase Plan during the years ended December 31, 2013, 2012 and 2011, respectively.

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Unsecured Line of Credit (Details) (USD $)	12 Months Ended		0 Months Ended					0 Months Ended					12 Months Ended
	Dec. 31, 2013 Y	Dec. 31, 2012	Jul. 26, 2013 After the Amendment [Member]	Jul. 26, 2013 Prior to Amendment [Member]	Jul. 26, 2013 Alternative Base Interest Rate Calculation [Member] M	Jul. 26, 2013 Maximum [Member]	Jul. 26, 2013 Maximum [Member] After the Amendment [Member]	Jul. 26, 2013 Maximum [Member] Interest Rate Based on LIBOR or CDOR [Member]	Jul. 26, 2013 Maximum [Member] Alternative Base Interest Rate Calculation [Member]	Jul. 26, 2013 Minimum [Member]	Jul. 26, 2013 Minimum [Member] Interest Rate Based on LIBOR or CDOR [Member]	Jul. 26, 2013 Minimum [Member] Alternative Base Interest Rate Calculation [Member]	Dec. 31, 2013 Rate Based on Current Credit Rating [Member] Interest Rate Based on LIBOR or CDOR [Member]	Dec. 31, 2013 Rate Based on Current Credit Rating [Member] Alternative Base Interest Rate Calculation [Member]	Dec. 31, 2013 Rate Based on Current Credit Rating [Member] Current Rates Based on Credit Ratings [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 1,000,000,000	$ 750,000,000
Line of Credit Facility, Maximum Borrowing Capacity							1,500,000,000
Line of Credit Facility, Expiration Date			Jul. 26, 2018	Jun. 24, 2014
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage						0.35%				0.125%					0.15%
Margin added to Calculated Interest Rate								1.70%	0.70%		0.925%	0.00%	1.00%	0.00%
Amount added to Federal Funds Rate to Calculate Interest Rate					0.50%
LIBOR Period Used to Calculate Interest Rate (in months)					1
Amount added to LIBOR to Calculate Interest Rate					1.00%
Line of Credit Facility, Amount Outstanding	$ 0.0	$ 0
Leverage Ratio, Maximum	60.00%
Leverage Ratio Maximum Increasing Limit	65.00%
Leverage Ratio Reduction Limit	60.00%
Leverage Ratio Reduction Period, Years	1
Maximum Secured Debt Leverage Ratio	55.00%
Fixed Charge Coverage Ratio Minimum.	1.40
Maximum Unsecured Debt Leverage Ratio	60.00%
Unsecured Debt Leverage Ratio Maximum Increasing Limit	65.00%
Unsecured Debt Leverage Ratio Reduction Limit	60.00%
Unsecured Debt Leverage Ratio Reduction Period, Years	1
Unsecured Debt Interest Coverage Ratio Minimum.	1.75

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 841,440	$ 332,139	$ 313,826
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	565,397	454,044	439,184
Non-cash compensation expense	45,155	29,679	29,672
Impairment loss	8,306	0	0
Income from unconsolidated joint ventures	(75,074)	(49,078)	(85,896)
Gains on consolidation of joint ventures	385,991	0	0
Distributions of net cash flow from operations of unconsolidated joint ventures	32,600	47,002	39,851
Losses (gains) on investments in securities	(2,911)	(1,389)	443
Non-cash portion of interest expense	2,649	43,131	54,962
Settlement of accreted debt discount on repurchases of senior notes	(56,532)	(69,499)	(5,601)
Losses (gains) from early extinguishments of debt	(264)	(1,000)	1,494
Gain on sale of real estate from discontinued operations	(112,829)	(36,877)	0
Gain on forgiveness of debt from discontinued operations	(20,182)	0	0
Impairment loss from discontinued operations	3,241	0	0
Change in assets and liabilities:
Cash held in escrows	315	10,272	(9,801)
Tenant and other receivables, net	(443)	23,155	(19,396)
Accrued rental income, net	(59,972)	(77,363)	(79,992)
Prepaid expenses and other assets	12,966	6,990	(39,213)
Accounts payable and accrued expenses	13,108	3,854	6,660
Accrued interest payable	21,302	3,356	6,778
Other liabilities	2,073	1,354	6,569
Tenant leasing costs	(56,428)	(76,821)	(53,212)
Total adjustments	(63,514)	310,810	292,502
Net cash provided by operating activities	777,926	642,949	606,328
Cash flows from investing activities:
Acquisitions of real estate	(522,900)	(788,052)	(112,180)
Construction in progress	(396,835)	(356,397)	(271,856)
Building and other capital improvements	(73,821)	(49,943)	(61,961)
Tenant improvements	(105,425)	(139,662)	(76,320)
Proceeds from the sale of real estate	250,078	61,963	0
Cash recorded upon consolidation	79,468	0	0
Proceeds from land transaction	0	0	43,887
Proceeds from mortgage loan released from (placed in) escrow	0	0	267,500
Deposit on real estate	0	0	10,000
Issuance of notes receivable,net	12,491	(2,049)	(10,442)
Capital contributions to unconsolidated joint ventures	0	(6,214)	(17,970)
Capital distributions from unconsolidated joint ventures	225,862	3,557	140,505
Investments in securities, net	(1,558)	(1,235)	(1,259)
Net cash used in investing activities	(532,640)	(1,278,032)	(90,096)
Cash flows from financing activities:
Proceeds from mortgage notes payable	0	0	1,178,306
Repayments of mortgage notes payable	(80,311)	(253,877)	(1,251,841)
Proceeds from unsecured senior notes	1,194,753	997,790	848,019
Redemption/repurchase of unsecured senior notes	0	(224,261)	0
Redemption/repurchase/exchange of unsecured exchangeable senior notes	(393,468)	(507,434)	(44,586)
Deferred financing costs	(15,195)	(8,468)	(15,970)
Net proceeds from preferred stock issuance	193,623	0	0
Deposit on mortgage loan financing	0	0	(14,500)
Returned deposit on mortgage loan financing	0	0	14,500
Net proceeds from ATM stock issuances	0	247,027	439,037
Net proceeds from equity transactions	(334)	226	9,667
Redemption of preferred units	(43,070)	(18,329)	0
Dividends and distributions	(451,118)	(372,899)	(332,597)
Proceeds from sale of ownership interest and contributions from noncontrolling interest in property partnerships	682,617	0	0
Distributions to noncontrolling interest in property partnerships	(9,624)	(5,922)	(2,007)
Net cash provided by (used in) financing activities	1,077,873	(146,147)	828,028
Net increase (decrease) in cash and cash equivalents	1,323,159	(781,230)	1,344,260
Cash and cash equivalents, beginning of year	1,041,978	1,823,208
Cash and cash equivalents, end of year	2,365,137	1,041,978	1,823,208
Supplemental disclosures:
Cash paid for interest	547,973	480,866	386,170
Interest capitalized	68,152	44,278	48,178
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	19,824	14,059	10,767
Real estate and related intangibles recorded upon consolidation	3,356,000	0	0
Debt recorded upon consolidation	2,056,000	0	0
Working capital recorded upon consolidation	177,315	0	0
Noncontrolling Interests recorded upon consolidation	480,861	0	0
investment in unconsolidated joint venture elminated upon consolidation	361,808	0	0
Mortgage note extinguished through foreclosure	25,000	0	0
Real estate transferred upon foreclosure	7,508	0	0
Land improvements contributed by noncontrolling interests in property partnership	4,546	0	0
Mortgage note payable assumed in connection with the acquisition of real estate	0	211,250	143,900
Redeemable noncontrolling Interest in property partnerships	0	98,787	0
Preferred units issued iIn connection with acquisition of real estate	0	79,405	0
Dividends and distributions declared but not paid	497,242	110,488	91,901
Issuance of common stock in connection with the exchange of exchangeable senior notes	43,834	0	0
Conversions of noncontrolling interests to stockholders' equity	30,291	34,621	85,498
Conversion of redeemable preferred units to common units	16,494	5,852	0
Issuance of restricted securities to employees and directors	$ 30,077	$ 26,198	$ 25,087

XML

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Tenant and other receivables, allowance for doubtful accounts	$ 1,636	$ 1,960
Accrued rental income, allowance	3,636	1,571
Unsecured senior notes, discount	14,146	10,472
Unsecured exchangeable senior notes, discount	$ 182	$ 1,653
Excess stock, par value	$ 0.01	$ 0.01
Excess stock, shares authorized	150,000,000	150,000,000
Excess stock, shares issued	0	0
Excess stock, shares outstanding	0	0
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	153,062,001	151,680,109
Common stock, shares outstanding	152,983,101	151,601,209
Treasury common stock at cost, shares	78,900	78,900
Series B Cumulative Redeemable Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0
Preferred stock, shares authorized	92,000	0
Series B Dividend Rate Percentage	5.25%	0.00%
Preferred stock, shares issued	80,000	0
Series B Liquidation Preference Per Share	$ 2,500.00	$ 0
Preferred stock, shares outstanding	80,000	0

XML

Commitments And Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises. 

The Company has letter of credit and performance obligations of approximately $13.9 million related to lender and development requirements.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of the property or its interest in the joint ventures. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners. See also Noncontrolling Interest—Redeemable Interest in Property Partnership in Note 11.

In connection with the assumption of 767 Fifth Avenue's (the General Motors Building) secured loan by the Company’s consolidated joint venture, 767 Venture, LLC, the Company guaranteed the consolidated joint venture’s obligation to fund various escrows, including tenant improvements, taxes and insurance in lieu of cash deposits. As of December 31, 2013, the maximum funding obligation under the guarantee was approximately $24.1 million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee.

In connection with the mortgage financing collateralized by the Company's John Hancock Tower property located in Boston, Massachusetts, the Company has agreed to guarantee approximately $15.9 million related to its obligation to provide funds for certain tenant re-leasing costs. The mortgage financing matures on January 6, 2017.

From time to time, the Company (or the applicable joint venture) has also agreed to guarantee portions of the principal, interest or other amounts in connection with other unconsolidated joint venture borrowings. In addition to the financial guarantees referenced above, the Company has agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) on certain of its unconsolidated joint venture loans.

Concentrations of Credit Risk

Management of the Company performs ongoing credit evaluations of tenants and may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees. Although the Company’s properties are geographically diverse and the tenants operate in a variety of industries, to the extent the Company has a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on the Company.

Some potential losses are not covered by insurance.

The Company carries insurance coverage on its properties of types and in amounts and with deductibles that it believes are in line with coverage customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market following the terrorist attacks of September 11, 2001, the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) was enacted in November 2002 to require regulated insurers to make available coverage for “certified” acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to December 31, 2014 by the Terrorism Risk Insurance Program Reauthorization Act of 2007 (“TRIPRA”) and the Company can provide no assurance that it will be extended further. Currently, the Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism certified under TRIA other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billion of coverage in the Company’s property insurance program which is provided by IXP, LLC (“IXP”) as a direct insurer. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage, with $1.375 billion of Terrorism Coverage in excess of $250 million being provided by NYXP, LLC (“NYXP”), as a direct insurer. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIA (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the additional Terrorism Coverage provided by IXP for 601 Lexington Avenue, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $100.0 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in its portfolio or for any other reason. In the event TRIPRA is not extended beyond December 31, 2014, (i) the Company will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing its overall cost of insurance, (ii) if such insurance is not available at commercially reasonable rates with limits equal to its current coverage or at all, the Company may not continue to have full occurrence limit coverage for acts of terrorism, (iii) the Company may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (iv) the Company may not be able to obtain future debt financings secured by individual properties and (v) the Company may cancel the insurance policies issued by IXP for the NBCR Coverage and the additional Terrorism Coverage for 601 Lexington Avenue and by NYXP for the Terrorism Coverage for 767 Fifth Avenue. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that the Company believes are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically, the Company currently carries earthquake insurance which covers its San Francisco region (excluding 535 Mission Street and the below grade improvements for Transbay Tower) with a $120 million per occurrence limit and a $120 million annual aggregate limit, $20 million of which is provided by IXP, as a direct insurer. The builders risk policy maintained for the development of 535 Mission Street in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. In addition, the builders risk policy maintained for the development of the below grade improvements of the Transbay Tower in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. The amount of the Company’s earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact the Company’s ability to finance properties subject to earthquake risk. The Company may discontinue earthquake insurance or change the structure of its earthquake insurance program on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.

IXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s earthquake insurance coverage for its Greater San Francisco properties, the additional Terrorism Coverage for 601 Lexington Avenue and the Company’s NBCR Coverage. The additional Terrorism Coverage provided by IXP for 601 Lexington Avenue only applies to losses which exceed the program trigger under TRIA. NYXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s Terrorism Coverage for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program trigger under TRIA and NYXP reinsures with a third-party insurance company any coinsurance payable under TRIA. Insofar as the Company owns IXP and NYXP, it is responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of the Company’s consolidated financial statements. In particular, if a loss occurs which is covered by the Company’s NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If the Company experiences a loss and IXP or NYXP are required to pay under their insurance policies, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, the Operating Partnership has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

The mortgages on the Company's properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identity of the insurance companies in the Company's insurance programs. The ratings of some of the Company's insurers are below the rating requirements in some of the Company's loan agreements and the lenders for these loans could attempt to claim that an event of default has occurred under the loan. The Company believes it could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future, the Company's ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers or amounts of insurance which are difficult to obtain or which result in a commercially unreasonable premium. There can be no assurance that a deficiency in the financial ratings of one or more of the Company's insurers will not have a material adverse effect on the Company.

The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but the Company cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which the Company cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect the Company's business and financial condition and results of operations.

Legal Matters

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on the financial position, results of operations or liquidity of the Company.

State and Local Tax Matters

Because the Company is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which the Company owns real estate either have undergone, or are currently undergoing, tax audits. Although the Company believes that it has substantial arguments in favor of its positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on the Company’s results of operations.

Environmental Matters

It is the Company’s policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with the Company’s acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that the Company believes will have a material adverse effect on its business, assets, financial condition, results of operations or liquidity, and the Company is not otherwise aware of environmental conditions with respect to its properties that the Company believes would have such a material adverse effect. However, from time to time environmental conditions at the Company’s properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, the Company (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. The Company developed an office park on the property. The Company engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to the Company’s ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify the Company for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges.

Environmental investigations at some of the Company’s properties and certain properties owned by affiliates of the Company have identified groundwater contamination migrating from off-site source properties. In each case the Company engaged a licensed environmental consultant to perform the necessary investigations and assessments and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. The Company also believes that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although the Company believes that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the identified

groundwater contamination, the Company will take such further response actions (if any) that it deems necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at this time.

Some of the Company’s properties and certain properties owned by the Company’s affiliates are located in urban, industrial and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these situations it is the Company’s practice to investigate the nature and extent of detected contamination and estimate the costs of required response actions and special handling procedures. The Company then uses this information as part of its decision-making process with respect to the acquisition and/or development of the property. For example, the Company owns a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low levels of certain contaminants. The Company has developed an office park on this property. Prior to and during redevelopment activities, the Company engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws.

The Company expects that resolution of the environmental matters relating to the above will not have a material impact on its business, assets, financial condition, results of operations or liquidity. However, the Company cannot assure you that it has identified all environmental liabilities at its properties, that all necessary remediation actions have been or will be undertaken at the Company’s properties or that the Company will be indemnified, in full or at all, in the event that such environmental liabilities arise.

Tax Protection Obligations

In connection with the acquisition or contribution of three properties, the Company entered into agreements for the benefit of the selling or contributing parties which specifically state that until such time as the contributors do not hold at least a specified percentage of the OP Units owned by such person following the contribution of the properties, or until June 9, 2017for 767 Fifth Avenue (the General Motors Building), the Operating Partnership will not sell or otherwise transfer the properties in a taxable transaction. If the Company does sell or transfer the properties in a taxable transaction, it would be liable to the contributors for contractual damages.

XML

Real Estate and Accumulated Depreciation Activity of Real Estate and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Real Estate, Balance at the beginning of the year	$ 14,869,887	$ 13,363,113	$ 12,740,892
Real Estate, Additions to / improvements of real estate	4,410,622	1,602,583	668,084
Real Estate, Assets sold / written off	(326,908)	(95,809)	(45,863)
Real Estate, Balance at the end of the year	18,953,601	14,869,887	13,363,113
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Accumulated depreciation, Balance at beginning of the year	2,919,479	2,626,324	2,308,665
Accumulated depreciation, Depreciation expense	419,908	367,625	362,636
Accumulated depreciatio, Assets sold / written off	(193,686)	(74,470)	(44,977)
Accumulated depreciation, Balance at end of the year	$ 3,145,701	$ 2,919,479	$ 2,626,324

XML

Subsequent Events subsequent Events (Details) (USD $)	12 Months Ended				0 Months Ended														0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014	Jan. 27, 2014 MYLTIP 2014 [Member] indices Y	Jan. 27, 2014 MYLTIP 2014 [Member] Cohen & Steers Realty Majors Portfolio Index [Member]	Jan. 27, 2014 MYLTIP 2014 [Member] NAREIT Office Index adjusted [Member]	Jan. 31, 2014 OPP Units 2011 [Member]	Jan. 27, 2014 High [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 Minimum [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 Maximum [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 Threshold [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 Target [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 Exceptional [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 MYLTIP Vesting 2017 [Member] MYLTIP 2014 [Member]	Jan. 27, 2014 MYLTIP vesting 2018 [Member] MYLTIP 2014 [Member]	Jan. 31, 2014 Restricted Stock [Member]	Feb. 10, 2014 The Avant at Reston Town Center Residential [Member] apartments sqft	Feb. 18, 2014 3.625% Exchangeable Senior Notes [Member]
Subsequent Event [Line Items]
Amount of Each Tier									$ 26,800,000			$ 6,700,000	$ 13,400,000	$ 40,200,000
Weighted Percentage of Index Used to Compare to TRS						50.00%	50.00%
Potential Awards Earned										0	40,200,000
Indices Used to Compare TRS					2
Number of Tiers					4
Percentage of annualized TRS for Reduction of Earned Awards					0.00%
Percentage to Cause Some Awards to be Earned Even if on a Relative Basis it Would Not Result in any Earned Awards					12.00%
Vesting Percentage															50.00%	50.00%
Vesting Date															Feb. 03, 2017	Feb. 03, 2018
Distributions percent before measurement date					10.00%
Value of MYLTIP Awards					13,100,000
Common stock, shares issued	153,062,001	151,680,109															21,455
LTIP units issued (in shares)				109,718
Accelerated Compensation Expenses Related To 2011 OPP Units								1,200,000
Employee and director payment per share (in dollars per share)								$ 0.25
Number of apartment units																		359
Net Rentable Area																		355,000
Coupon/Stated Rate	3.625%																		3.625%
Repayments of Unsecured Debt	$ 0	$ 224,261,000	$ 0																$ 747,500,000
TRS measurement (in years)					3

XML

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 21, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Entity Registrant Name	BOSTON PROPERTIES INC
Amendment Flag	false
Entity Central Index Key	0001037540
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		153,006,302
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 15,937,365,185

XML

Noncontrolling Interests

12 Months Ended

Dec. 31, 2013

Noncontrolling Interest [Abstract]

Noncontrolling Interests

Noncontrolling Interests

Noncontrolling interests relate to the interests in the Operating Partnership not owned by the Company and interests in consolidated property partnerships not wholly-owned by the Company. As of December 31, 2013, the noncontrolling interests consisted of 15,583,370 OP Units, 1,455,761 LTIP Units, 396,500 2011 OPP Units, 396,150 2012 OPP Units, 316,325 2013 MYLTIP Units, 666,116 Series Two Preferred Units (or 874,168 OP Units on an as converted basis) and 360,126 Series Four Preferred Units (not convertible into OP Units) held by parties other than the Company.

Noncontrolling Interest—Redeemable Preferred Units of the Operating Partnership

The Preferred Units at December 31, 2013 consisted of 666,116 Series Two Preferred Units, which bear a preferred distribution equal to the greater of (1) the distribution which would have been paid in respect of the Series Two Preferred Unit had such Series Two Preferred Unit been converted into an OP Unit (including both regular and special distributions) or (2) 6.00% per annum on a liquidation preference of $50.00 per unit, and are convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). The holders of Series Two Preferred Units have the right to require the Operating Partnership to redeem their units for cash at the redemption price of $50.00 per unit on May 12, 2014. The holders also had the right to have their Series Two Preferred Units redeemed for cash on May 12, 2009, May 12, 2010, May 12, 2011, May 14, 2012 and May 14, 2013, although no holder exercised such right. Due to the holders' redemption option existing outside the control of the Company, the Series Two Preferred Units are presented outside of permanent equity in the Company's Consolidated Balance Sheets. In May 2014, the Company also has the right, subject to certain conditions, to call for redemption all of the outstanding Series Two Preferred Units for cash or to convert into OP Units any Series Two Preferred Units that have not been previously redeemed. In the event the Company calls the Series Two Preferred Units for redemption, the holders shall have the right to convert the Series Two Preferred Units into OP Units.

During the years ended December 31, 2013 and 2012, 329,881 and 117,047 Series Two Preferred Units of the Operating Partnership, respectively, were converted by the holders into 432,914 and 153,605 OP Units, respectively. In addition, the Company paid the accrued preferred distributions due to the holders of Preferred Units that were converted.

On February 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. On May 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. On August 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. On November 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit.

The Preferred Units at December 31, 2013 also included 360,126 Series Four Preferred Units, which bear a preferred distribution equal to 2.00% per annum on a liquidation preference of $50.00 per unit and are not convertible into OP Units. In order to secure the performance of certain obligations by the holders, such Series Four Preferred Units are subject to forfeiture pursuant to the terms of a pledge agreement. The holders of Series Four Preferred Units have the right, at certain times and subject to certain conditions set forth in the Certificate of Designations establishing the rights, limitations and preferences of the Series Four Preferred Units, to require the Operating Partnership to redeem all of their their units for cash at the redemption price of $50.00 per unit. The Operating Partnership also has the right, at certain times and subject to certain conditions, to redeem all of the Series Four Preferred Units for cash at the redemption price of $50.00 per unit. The Series Four Preferred Units that are subject to the security interest under the pledge agreement may not be redeemed until and unless such security interest is released. The Operating Partnership's first right to redeem the Series Four Preferred Units was a 30-day period beginning on August 29, 2013. Due to the holders' redemption option existing outside the control of the Company, the Series Four Preferred Units are presented outside of permanent equity in the Company's Consolidated Balance Sheets. On August 29, 2013, the Company's Operating Partnership redeemed approximately 861,400 Series Four Preferred Units for cash at the redemption price of $50.00 per unit plus accrued and unpaid distributions through the redemption date.

On February 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On May 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On August 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On November 15, 2013, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit.

The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the years ended December 31, 2013, 2012 and 2011 (in thousands):

Balance at December 31, 2010	$	55,652
Net income	3,339
Distributions	(3,339		)
Balance at December 31, 2011	$	55,652
Issuance of redeemable preferred units (Series Four Preferred Units)	79,405
Net income	3,497
Distributions	(3,497		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(18,329		)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(5,852		)
Balance at December 31, 2012	$	110,876
Net income	6,046
Distributions	(6,046		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(43,070		)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(16,494		)
Balance at December 31, 2013	$	51,312

Noncontrolling Interest—Redeemable Interest in Property Partnership

On October 4, 2012, the Company completed the formation of a joint venture, which owns and operates Fountain Square located in Reston, Virginia. The joint venture partner contributed the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a nominal 50% interest in the joint venture. The Company contributed cash totaling approximately $87.0 million for its nominal 50% interest, which cash was distributed to the joint venture partner. Pursuant to the joint venture agreement (i) the Company has rights to acquire the partner's nominal 50% interest and (ii) the partner has the right to cause the Company to acquire the partner's interest on January 4, 2016, in each case at a fixed price totaling approximately $102.0 million in cash. The fixed price option rights expire on January 31, 2016. The Company is consolidating this joint venture due to the Company's right to acquire the partner's nominal 50% interest. The Company initially recorded the noncontrolling interest at its acquisition-date fair value as temporary equity, due to the redemption option existing outside the control of the Company. The Company will accrete the changes in the redemption value quarterly over the period from the acquisition date to the earliest redemption date using the effective interest method.  The Company will record the accretion after the allocation of net income and distributions of cash flow to the noncontrolling interest account balance.

The following table reflects the activity of the noncontrolling interest—redeemable interest in property partnership in the Company's Fountain Square consolidated joint venture for the for the years ended December 31, 2013 and 2012 (in thousands):

Balance at December 31, 2011	$	—
Acquisition-date fair value of redeemable interest	98,787
Net loss	(719		)
Distributions	(3,032		)
Adjustment to reflect redeemable interest at redemption value	2,522
Balance at December 31, 2012	$	97,558
Net loss	(1,839		)
Distributions	(4,585		)
Adjustment to reflect redeemable interest at redemption value	8,475
Balance at December 31, 2013	$	99,609

Noncontrolling Interest—Common Units of the Operating Partnership

During the years ended December 31, 2013 and 2012, 929,441 and 1,110,660 OP Units, respectively, were presented by the holders for redemption (including 432,914 and 153,605 OP Units, respectively, issued upon conversion of Series Two Preferred Units and 24,028 and 544,729 OP Units, respectively, issued upon conversion of LTIP Units) and were redeemed by the Company in exchange for an equal number of shares of Common Stock.

At December 31, 2013, the Company had outstanding 396,500 2011 OPP Units and 396,150 2012 OPP Units and 316,325 2013 MYLTIP Units (See Note 17). Prior to the measurement date (January 31, 2014 for 2011 OPP Units (See Note 20), February 6, 2015 for 2012 OPP Units and February 4, 2016 for 2013 MYLTIP Units), holders of OPP Units and 2013 MYLTIP Units are entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the measurement date, the number of OPP Units and 2013 MYLTIP Units, both vested and unvested, that OPP and 2013 MYLTIP award recipients have earned, if any, based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit.

On January 29, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2011 OPP Units and 2012 OPP Units in the amount of $0.065 per unit, to holders of record as of the close of business on December 31, 2012. On April 30, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on March 29, 2013. On July 31, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on June 28, 2013. On October 31, 2013, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit and a distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on September 30, 2013. On November 27, 2013, the Company, as general partner of the Operating Partnership, declared a special cash distribution on the OP Units and LTIP Units in the amount of $2.25 per unit payable on January 29, 2014 to holders of record as of the close of business on December 31, 2013. The special cash distribution was in addition to the regular quarterly distribution on the OP Units and LTIP Units of $0.65 per unit and the distribution on the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units in the amount of $0.065 per unit, in each case payable on January 29, 2014 to holders of record as of the close of business on December 31, 2013. Holders of the 2011 OPP Units, 2012 OPP Units and 2013 MYLTIP Units are not entitled to receive any special distributions. Holders of Series Two Preferred Units will participate in the special cash dividend (separately from their regular February 2014 distribution) on an as-converted basis in connection with their regular May 2014 distribution payment as provided in the Operating Partnership's partnership agreement.

The Series Two Preferred Units may be converted into OP Units at the election of the holder thereof at any time. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit for cash equal to the then value of a share of common stock of the Company. The Company may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (not owned by the Company and including LTIP Units assuming that all conditions had been met for the conversion thereof) and Series Two Preferred Units (on an as converted basis) had all of such units been redeemed at December 31, 2013 was approximately $1.7 billion and $87.7 million, respectively, based on the closing price of the Company’s common stock of $100.37 per share on December 31, 2013.

Noncontrolling Interest—Property Partnerships

The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $726.1 million at December 31, 2013 and approximately $(2.0) million at December 31, 2012, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

On February 7, 2013, the partner in the Company's Transbay Tower joint venture issued a notice that it was electing under the joint venture agreement to reduce its nominal ownership interest in the venture from 50% to 5%. On February 26, 2013, the Company issued a notice to the partner electing to proceed with the venture on that basis. As a result, the Company has a 95% nominal interest in and is consolidating the joint venture. Under the joint venture agreement, if certain return thresholds are achieved the partner will be entitled to an additional promoted interest. Also, under the agreement, (1) the partner has the right to cause the Company to purchase the partner's interest after the defined stabilization date and (2) the Company has the right to acquire the partner's interest on the third anniversary of the stabilization date, in each case at an agreed upon purchase price or appraised value. On March 26, 2013, the consolidated joint venture completed the acquisition of a land parcel in San Francisco, California which will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The purchase price for the land was approximately $192.0 million. The joint venture has commenced construction of the initial phase of the development consisting of building the project to grade (See Note 3).

On May 31, 2013, the Company's two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue(the General Motors Building) in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, the Company and its new joint venture partners modified the Company's relative decision making authority and consent rights with respect to the joint venture's assets and operations. These changes resulted in the Company having sufficient financial and operating control over 767 Venture, LLC such that the Company now accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting. Upon consolidation, the Company recognized the new joint venture partners' aggregate 40% equity interest at its aggregate fair value of approximately $480.9 million within Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets (See Notes 3 and 5).

On October 9, 2013, the Company completed the sale of a 45% ownership interest in its Times Square Tower property for a gross sale price of $684.0 million in cash. Net cash proceeds totaled approximately $673.1 million, after the payment of transaction costs. In connection with the sale, the Company formed a joint venture with the buyer and will provide customary property management and leasing services to the joint venture. Times Square Tower is an approximately 1,246,000 net rentable square foot Class A office tower located in New York City. The transaction did not qualify as a sale of real estate for financial reporting purposes because the Company continues to control the joint venture and will therefore continue to account for the entity on a consolidated basis in its financial statements. The Company has accounted for the transaction as an equity transaction and has recognized noncontrolling interest in its consolidated balance sheets totaling approximately $243.5 million, which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction. The difference between the net cash proceeds received and the noncontrolling interest recognized, which difference totals approximately $429.6 million, has not been reflected as a gain on sale of real estate in the Company’s consolidated statements of operations and has instead been reflected as an increase to Additional Paid-in Capital in the Company’s consolidated balance sheets (See Notes 3).

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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 1,987,671	$ 1,715,425	$ 1,606,655
Rental Revenue: Office/Technical	55,525	39,218	41,585
Rental Revenue: Residential	22,318	20,568	6,617
Rental Revenue: Hotel	40,330	37,915	34,529
Rental Revenue Total	2,105,844	1,813,126	1,689,386
Rental Revenue: % of Grand Totals	100.00%	100.00%	100.00%
Rental Expenses: Class A Office	716,049	617,482	555,664
Rental Expenses: Office/Technical	14,777	10,614	11,525
Rental Expenses: Residential	12,130	10,992	5,479
Rental Expenses: Hotel	28,447	28,120	26,128
Rental Expenses: Total	771,403	667,208	598,796
Rental Expenses: % Of Grand Totals	100.00%	100.00%	100.00%
Net operating Income	1,334,441	1,145,918	1,090,590
Net operating Income: % of Grand Totals	100.00%	100.00%	100.00%
Boston [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	665,991	617,652	537,743
Rental Revenue: Office/Technical	22,617	22,460	25,349
Rental Revenue: Residential	4,395	3,936	985
Rental Revenue: Hotel	40,330	37,915	34,529
Rental Revenue Total	733,333	681,963	598,606
Rental Revenue: % of Grand Totals	34.82%	37.61%	35.43%
Rental Expenses: Class A Office	259,997	242,904	206,469
Rental Expenses: Office/Technical	6,879	6,499	7,245
Rental Expenses: Residential	1,823	1,675	521
Rental Expenses: Hotel	28,447	28,120	26,128
Rental Expenses: Total	297,146	279,198	240,363
Rental Expenses: % Of Grand Totals	38.52%	41.85%	40.14%
Net operating Income	436,187	402,765	358,243
Net operating Income: % of Grand Totals	32.69%	35.15%	32.85%
New York [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	662,888	481,844	458,791
Rental Revenue: Office/Technical	0	0	0
Rental Revenue: Residential	0	0	0
Rental Revenue: Hotel	0	0	0
Rental Revenue Total	662,888	481,844	458,791
Rental Revenue: % of Grand Totals	31.48%	26.58%	27.16%
Rental Expenses: Class A Office	223,265	160,386	152,649
Rental Expenses: Office/Technical	0	0	0
Rental Expenses: Residential	0	0	0
Rental Expenses: Hotel	0	0	0
Rental Expenses: Total	223,265	160,386	152,649
Rental Expenses: % Of Grand Totals	28.94%	24.04%	25.49%
Net operating Income	439,623	321,458	306,142
Net operating Income: % of Grand Totals	32.94%	28.05%	28.07%
Princeton [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	62,678	61,350	62,648
Rental Revenue: Office/Technical	0	0	0
Rental Revenue: Residential	0	0	0
Rental Revenue: Hotel	0	0	0
Rental Revenue Total	62,678	61,350	62,648
Rental Revenue: % of Grand Totals	2.98%	3.38%	3.71%
Rental Expenses: Class A Office	28,375	27,601	28,620
Rental Expenses: Office/Technical	0	0	0
Rental Expenses: Residential	0	0	0
Rental Expenses: Hotel	0	0	0
Rental Expenses: Total	28,375	27,601	28,620
Rental Expenses: % Of Grand Totals	3.68%	4.14%	4.78%
Net operating Income	34,303	33,749	34,028
Net operating Income: % of Grand Totals	2.57%	2.95%	3.12%
San Francisco [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	214,755	208,177	207,003
Rental Revenue: Office/Technical	17,259	494	0
Rental Revenue: Residential	0	0	0
Rental Revenue: Hotel	0	0	0
Rental Revenue Total	232,014	208,671	207,003
Rental Revenue: % of Grand Totals	11.02%	11.51%	12.25%
Rental Expenses: Class A Office	77,905	75,542	72,122
Rental Expenses: Office/Technical	3,708	149	0
Rental Expenses: Residential	0	0	0
Rental Expenses: Hotel	0	0	0
Rental Expenses: Total	81,613	75,691	72,122
Rental Expenses: % Of Grand Totals	10.58%	11.34%	12.05%
Net operating Income	150,401	132,980	134,881
Net operating Income: % of Grand Totals	11.27%	11.60%	12.37%
Washington, DC [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	381,359	346,402	340,470
Rental Revenue: Office/Technical	15,649	16,264	16,236
Rental Revenue: Residential	17,923	16,632	5,632
Rental Revenue: Hotel	0	0	0
Rental Revenue Total	414,931	379,298	362,338
Rental Revenue: % of Grand Totals	19.70%	20.92%	21.45%
Rental Expenses: Class A Office	126,507	111,049	95,804
Rental Expenses: Office/Technical	4,190	3,966	4,280
Rental Expenses: Residential	10,307	9,317	4,958
Rental Expenses: Hotel	0	0	0
Rental Expenses: Total	141,004	124,332	105,042
Rental Expenses: % Of Grand Totals	18.28%	18.63%	17.54%
Net operating Income	$ 273,927	$ 254,966	$ 257,296
Net operating Income: % of Grand Totals	20.53%	22.25%	23.59%

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Selected Interim Financial Information (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 576,199	$ 571,481	$ 510,033	$ 477,826	$ 478,047	$ 464,220	$ 466,197	$ 438,722	$ 2,135,539	$ 1,847,186	$ 1,722,792
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	79,395	82,311	503,446	38,496	74,251	63,331	94,795	53,079	703,648	285,456	302,950
Net income attributable to Boston Properties, Inc.	$ 88,719	$ 152,677	$ 452,417	$ 47,854	$ 65,400	$ 57,249	$ 118,559	$ 48,454	$ 749,811	$ 289,650	$ 272,679
Income attributable to Boston Properties Inc., per share basic	$ 0.58	$ 1.00	$ 2.95	$ 0.32	$ 0.43	$ 0.38	$ 0.79	$ 0.33	$ 4.87	$ 1.93	$ 1.87
Income attributable to Boston Properties Inc., per share diluted	$ 0.58	$ 1.00	$ 2.94	$ 0.31	$ 0.43	$ 0.38	$ 0.78	$ 0.33	$ 4.86	$ 1.92	$ 1.86

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue
Base rent	$ 1,675,412	$ 1,457,834	$ 1,376,278
Recoveries from tenants	292,944	228,170	198,083
Parking and other	97,158	89,207	80,496
Total rental revenue	2,065,514	1,775,211	1,654,857
Hotel revenue	40,330	37,915	34,529
Development and management services	29,695	34,060	33,406
Total revenue	2,135,539	1,847,186	1,722,792
Expenses
Rental	742,956	639,088	572,668
Hotel	28,447	28,120	26,128
General and administrative	115,329	90,129	87,101
Transaction costs	1,744	3,653	1,987
Impairment loss	8,306	0	0
Depreciation and amortization	560,637	445,875	429,742
Total expenses	1,457,419	1,206,865	1,117,626
Operating income	678,120	640,321	605,166
Other income (expense)
Income from unconsolidated joint ventures	75,074	49,078	85,896
Gains on consolidation of joint ventures	385,991	0	0
Interest and other income	8,310	10,091	5,358
Gains (losses) from investments in securities	2,911	1,389	(443)
Interest expense	(446,880)	(410,970)	(391,533)
Gains (losses) from early extinguishments of debt	122	(4,453)	(1,494)
Income (loss) from continuing operations	703,648	285,456	302,950
Discontinued operations
Income from discontinued operations	8,022	9,806	10,876
Gain on sale of real estate from discontinued operations	112,829	36,877	0
Gain on forgiveness of debt from discontinued operations	20,182	0	0
Impairment loss from discontinued operations	(3,241)	0	0
Net income (loss)	841,440	332,139	313,826
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(1,347)	(3,792)	(1,558)
Noncontrolling interest - redeemable preferred units of the Operating Partnership	(6,046)	(3,497)	(3,339)
Noncontrolling interest - common units of the Operating Partnership	(70,085)	(30,125)	(35,007)
Noncontrolling interest in discontinued operations - common units of the Operating Partnership	(14,151)	(5,075)	(1,243)
Net income attributable to Boston Properties, Inc.	749,811	289,650	272,679
Preferred dividends	(8,057)	0	0
Net income attributable to Boston Properties, Inc. common shareholders	$ 741,754	$ 289,650	$ 272,679
Basic earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations (in dollars per share)	$ 4.06	$ 1.65	$ 1.80
Discontinued operations (in dollars per share)	$ 0.81	$ 0.28	$ 0.07
Net income (in dollars per share)	$ 4.87	$ 1.93	$ 1.87
Weighted average number of common shares outstanding (in shares)	152,201	150,120	145,693
Diluted earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations (in dollars per share)	$ 4.05	$ 1.64	$ 1.80
Discontinued operations (in dollars per share)	$ 0.81	$ 0.28	$ 0.06
Diluted Earnings: Net income, Per Share Amount (in dollars per share)	$ 4.86	$ 1.92	$ 1.86
Weighted average number of common and common equivalent shares outstanding (in shares)	152,521	150,711	146,218

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Investments in Unconsolidated Joint Ventures

12 Months Ended

Dec. 31, 2013

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at December 31, 2013:

Entity	Properties	Nominal % Ownership
Square 407 Limited Partnership	Market Square North	50.0	%
The Metropolitan Square Associates LLC	Metropolitan Square	51.0	%
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0	%	(1)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3	%	(2)
RBP Joint Venture LLC	N/A	50.0	%	(3)
Boston Properties Office Value-Added Fund, L.P.	N/A	39.5	%	(4)
Annapolis Junction NFM, LLC	Annapolis Junction	50.0	%	(5)
2 GCT Venture LLC	N/A	60.0	%	(6)
540 Madison Venture LLC	540 Madison Avenue	60.0	%
125 West 55th Street Venture LLC	N/A	60.0	%	(7)
500 North Capitol LLC	500 North Capitol Street, NW	30.0	%

 _______________

(1) The Company’s economic ownership can increase based on the achievement of certain return thresholds.

(2) The Company’s wholly-owned entity that owns the office component of the project also owns a 33.3% interest in the entity owning the land, parking and infrastructure of the project.

(3) Eighth Avenue and 46th Street was sold on July 19, 2013.

(4) The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013 (See Note 3). As of December 31, 2013, the investment is comprised of undistributed cash.

(5) Comprised of two buildings, one building under construction and two undeveloped land parcels.

(6) Two Grand Central Tower was sold on October 25, 2011. As of December 31, 2013, the investment is comprised of undistributed cash.

(7) 125 West 55th Street was sold on May 30, 2013. As of December 31, 2013, the investment is comprised of undistributed cash.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures at an agreed upon fair value. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

The combined summarized balance sheets of the unconsolidated joint ventures are as follows:

	December 31, 2013			December 31, 2012
	(in thousands)
ASSETS
Real estate and development in process, net	$	924,297		$	4,494,971
Other assets	163,149			673,716
Total assets	$	1,087,446		$	5,168,687
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	749,732		$	3,039,922
Other liabilities	28,830			792,888
Members’/Partners’ equity	308,884			1,335,877
Total liabilities and members’/partners’ equity	$	1,087,446		$	5,168,687
Company’s share of equity	$	154,726		$	787,941
Basis differentials (1)	(28,642		)	(128,025		)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	126,084		$	659,916

 _______________

(1) This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.

The combined summarized statements of operations of the joint ventures are as follows:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Total revenue (1)	$	311,548		$	564,205		$	589,294
Expenses
Operating	105,319			162,665			170,404
Depreciation and amortization	86,088			163,134			190,437
Impairment losses	—			—			40,468
Total expenses	191,407			325,799			401,309
Operating income	120,141			238,406			187,985
Other income (expense)
Interest expense	(112,535		)	(224,645		)	(228,494		)
Losses from early extinguishments of debt	(1,677		)	—			—
Income (loss) from continuing operations	5,929			13,761			(40,509		)
Gains on sales of real estate	14,207			990			—
Net income (loss)	$	20,136		$	14,751		$	(40,509	)
Company’s share of net income (loss)	$	4,612		$	6,863		$	(25,374	)
Gains on sales of real estate	54,501			—			46,166
Basis differential	(1,017		)	1,732			27,226
Elimination of inter-entity interest on partner loan	16,978			40,483			37,878
Income from unconsolidated joint ventures	$	75,074		$	49,078		$	85,896
Gains on consolidation of joint ventures	$	385,991		$	—		$	—

 _______________ 

(1) Includes straight-line rent adjustments of $7.8 million, $12.0 million and $21.9 million for the years ended December 31, 2013, 2012 and 2011, respectively. Includes net below-market rent adjustments of $33.7 million, $91.1 million and $120.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. Total revenue for the year ended December 31, 2012 includes termination income totaling approximately $19.6 million (of which the Company's share is approximately $11.8 million) related to a lease termination with a tenant at 767 Fifth Avenue (The General Motors Building).

On February 28, 2013, a joint venture in which the Company has a 50% interest completed and fully placed in-service Annapolis Junction Building Six, a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

On March 31, 2013, a joint venture in which the Company has a 30% interest completed and fully placed in-service 500 North Capitol Street, NW, a Class A office redevelopment project with approximately 231,000 net rentable square feet located in Washington, DC.

On April 4, 2013, a joint venture in which the Company has a 50% interest obtained construction financing collateralized by its Annapolis Junction Building Seven development project located in Annapolis, Maryland totaling $22.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on April 4, 2016, with two, one-year extension options, subject to certain conditions.

On April 10, 2013, the Company acquired the Mountain View Research Park and Mountain View Technology Park properties from its Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. In conjunction with the acquisition, the Value-Added Fund repaid the mortgage loans collateralized by the Mountain View Research Park and Mountain View Technology Park properties totaling approximately $90.0 million and $20.0 million, respectively, as well as the outstanding loans payable to the Company's Operating Partnership totaling approximately $8.6 million and $3.7 million, respectively. The Mountain View Research Park and Mountain View Technology Park mortgage loans bore interest at variable rates equal to LIBOR plus 2.00% per annum and LIBOR plus 2.50% per annum, respectively, and were scheduled to mature on May 31, 2014 and November 22, 2014, respectively. The joint venture recognized a loss on early extinguishment of debt totaling approximately $0.4 million, of which the Company's share was approximately $0.2 million, consisting of the write-off of unamortized deferred financing costs. Prior to the acquisition, the Company's ownership interest in the properties was approximately 39.5%. As a result of the acquisition, the Company owns 100% of the properties and is accounting for them on a consolidated basis (See Note 3). The Company had previously recognized an impairment loss on its investment in the unconsolidated joint venture. As a result, the Company recognized a gain on its investment of approximately $26.5 million, which is included within gains on consolidation of joint ventures in the Company's consolidated statements of operations.

On May 30, 2013, a joint venture in which the Company has a 60% interest completed the sale of its 125 West 55th Street property located in New York City for a sale price of $470.0 million, including the assumption by the buyer of the mortgage loan collateralized by the property totaling approximately $198.6 million. The mortgage loan bore interest at a fixed rate of 6.09% per annum and was scheduled to mature on March 10, 2020. Net cash proceeds totaled approximately $253.7 million, of which the Company's share was approximately $152.2 million, after the payment of transaction costs. 125 West 55th Street is a Class A office property totaling approximately 588,000 net rentable square feet. The Company had previously recognized an impairment loss on its investment in the unconsolidated joint venture. As a result, the Company recognized a gain on sale of real estate totaling approximately $43.2 million, which is included within income from unconsolidated joint ventures in the Company's consolidated statements of operations.

On May 31, 2013, the Company's two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, the Company and its new joint venture partners modified the Company's relative decision making authority and consent rights with respect to the joint venture's assets and operations. These changes resulted in the Company having sufficient financial and operating control over 767 Venture, LLC such that the Company now accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting (See Note 3). Upon consolidation, the Company recognized a non-cash gain on its investment of approximately $359.5 million, which is included within gains on consolidation of joint ventures in the Company's consolidated statements of operations.

On May 31, 2013, a joint venture in which the Company has a 30% interest refinanced its construction loan collateralized by 500 North Capitol Street, NW located in Washington, DC. The construction loan totaling approximately $90.6 million bore interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on October 14, 2014. The joint venture recognized a loss on early extinguishment of debt totaling approximately $1.0 million, of which the Company's share was approximately $0.3 million, consisting of the write-off of unamortized deferred financing costs. The new mortgage loan totaling $105.0 million requires interest only payments at a fixed interest rate of 4.15% per annum and matures on June 6, 2023.

On June 5, 2013, a joint venture in which the Company has a 60% interest refinanced its mortgage loans collateralized by 540 Madison Avenue located in New York City. The mortgage loans aggregating approximately $118.0 million bore interest at a weighted-average fixed rate of 5.20% per annum and were scheduled to mature on July 11, 2013. The joint venture recognized a loss on early extinguishment of debt totaling approximately $0.3 million, of which the Company's share was approximately $0.2 million, related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting. The new mortgage loan totaling $120.0 million requires interest only payments at a variable rate equal to LIBOR plus 1.50% per annum and matures on June 5, 2018.

On July 19, 2013, a joint venture in which the Company has a 50% interest completed the sale of its Eighth Avenue and 46th Street project located in New York City for an imputed sale price of $45.0 million. The Eighth Avenue and 46th Street project is comprised of an assemblage of land parcels and air-rights. Net cash proceeds to the Company totaled approximately $21.8 million, after the payment of transaction costs. The joint venture had previously recognized an impairment loss on the property. As a result, the joint venture recognized a gain on sale of real estate totaling approximately $12.6 million, of which the Company's share was approximately $11.3 million. The Company's share of the gain on sale of real estate is reflective of the Company's share of the net proceeds from the imputed sale price and is included within income from unconsolidated joint ventures in the Company's consolidated statements of operations.

On September 26, 2013, a joint venture in which the Company has a 50% interest entered into a lease agreement for its Annapolis Junction Building Seven development project. Annapolis Junction Building Seven when completed will consist of a Class A office property with approximately 125,000 net rentable square feet located in Annapolis, Maryland.

On October 29, 2013, a joint venture in which the Company has a 50% interest exercised an option to extend the maturity date to November 17, 2014 of the construction financing collateralized by its Annapolis Junction Building Six property. The construction financing totaling approximately $14.0 million bears interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on November 17, 2013. Annapolis Junction Building Six is a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

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Deferred Charges

12 Months Ended

Dec. 31, 2013

Deferred Charges [Abstract]

Deferred Charges

4.     Deferred Charges

Deferred charges consisted of the following at December 31, (in thousands):

	2013			2012
Leasing costs, including lease related intangibles	$	1,183,204		$	790,740
Financing costs	76,798			90,682
	1,260,002			881,422
Less: Accumulated amortization	(375,552		)	(293,187		)
	$	884,450		$	588,235

The following table summarizes the scheduled amortization of the Company's acquired in-place lease intangibles for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles
2014	$	91,903
2015	66,716
2016	55,083
2017	41,106
2018	36,306

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2013

Employee Benefit Plans [Abstract]

Compensation and Employee Benefit Plans [Text Block]

16.    Employee Benefit Plans

Effective January 1, 1985, the predecessor of the Company adopted a 401(k) Savings Plan (the “Plan”) for its employees. Under the Plan, as amended, employees, as defined, are eligible to participate in the Plan after they have completed three months of service. Upon formation, the Company adopted the Plan and the terms of the Plan.

Effective January 1, 2000, the Company amended the Plan by increasing the Company’s matching contribution to 200% of the first 3% from 200% of the first 2% of participant’s eligible earnings contributed (utilizing earnings that are not in excess of an amount established by the IRS ($255,000, $250,000 and $245,000 in 2013, 2012 and 2011, respectively), indexed for inflation) and by eliminating the vesting requirement. The Company’s aggregate matching contribution for the years ended December 31, 2013, 2012 and 2011 was $3.4 million, $3.2 million and $3.1 million, respectively.

Effective January 1, 2001, the Company amended the Plan to provide a supplemental retirement contribution to certain employees who have at least ten years of service on January 1, 2001, and who are 40 years of age or older as of January 1, 2001. The maximum supplemental retirement contribution will not exceed the annual limit on contributions established by the IRS. The Company will record an annual supplemental retirement credit for the benefit of each participant. The Company’s supplemental retirement contribution and credit for the years ended December 31, 2013, 2012 and 2011 was $60,000, $78,000 and $62,000, respectively.

The Company also maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Company’s obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2013 and 2012, the Company had maintained approximately $16.6 million and $12.2 million, respectively, in a separate account, which is not restricted as to its use. The Company’s liability under the plan is equal to the total amount of compensation deferred by the plan participants and earnings on the deferred compensation pursuant to investments elected by the plan participants. The Company’s liability as of December 31, 2013 and 2012 was $16.6 million and $12.2 million, respectively, which are included in the accompanying Consolidated Balance Sheets.

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Stockholders' Equity

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

As of December 31, 2013, the Company had 152,983,101 shares of Common Stock outstanding.

As of December 31, 2013, approximately $305.3 million remained available for issuance under the Company's $600 million “at the market” stock offering program. No shares were issued under the “at the market” stock offering program during the year ended December 31, 2013.

During the year ended December 31, 2013, the Company did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock by employees. During the year ended December 31, 2012, the Company issued 22,823 shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees.

During the years ended December 31, 2013 and 2012, the Company issued 929,441 and 1,110,660 shares of Common Stock, respectively, in connection with the redemption of an equal number of OP Units.

On January 29, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on December 31, 2012. On April 30, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on March 29, 2013. On July 31, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on June 28, 2013. On October 31, 2013, the Company paid a dividend in the amount of $0.65 per share of Common Stock to shareholders of record as of the close of business on September 30, 2013.

On November 27, 2013, the Company's Board of Directors declared a special cash dividend of $2.25 per share of Common Stock payable on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013. The special cash dividend was in addition to the regular quarterly dividend of $0.65 per share of Common Stock declared by the Company's Board of Directors and payable on January 29, 2014 to shareholders of record as of the close of business on December 31, 2013.

On March 27, 2013, the Company completed an underwritten public offering of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of its newly designated 5.25% Series B Cumulative Redeemable Preferred Stock, at a price of $2,500.00 per share ($25.00 per depositary share). The net proceeds from this offering were approximately $193.6 million, after deducting the underwriting discount and transaction expenses. The Company contributed the net proceeds to the Operating Partnership in exchange for 80,000 Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock. The Company will pay cumulative cash dividends on the Series B Preferred Stock at a rate of 5.25% per annum of the $2,500.00 liquidation preference per share. The Company may not redeem the Series B Preferred Stock prior to March 27, 2018, except in certain circumstances relating to the preservation of the Company's REIT status. On or after March 27, 2018, the Company, at its option, may redeem the Series B Preferred Stock for a cash redemption price of $2,500.00 per share ($25.00 per depositary share), plus all accrued and unpaid dividends. The Series B Preferred Stock is not redeemable by the holders, has no maturity date and is not convertible into any other security of the Company or its affiliates.

On May 15, 2013, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On August 15, 2013, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On November 15, 2013, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On November 27, 2013, the Company's Board of Directors declared a dividend of $32.8125 per share of Series B Preferred Stock payable on February 18, 2014 to shareholders of record as of the close of business on February 7, 2014.

During the year ended December 31, 2013, the Company issued 419,116 shares of Common Stock in connection with the exchange by holders of its Operating Partnership's 3.75% Exchangeable Senior Notes due 2036 (See Note 8).

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Employee Benefit Plans (Details) (USD $)	12 Months Ended			156 Months Ended	168 Months Ended	180 Months Ended
	Dec. 31, 2013 M	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Y age	Dec. 31, 2013	Dec. 31, 1999
Employee Benefit Plans [Abstract]
Eligibility Period For 401K Savings Plan In Months	3
Employer Matching Contribution, Percent of Match					200.00%	200.00%
Employer Matching Contribution, Percent of Employees' Gross Pay					3.00%	2.00%
Maximum Eligible Earnings As Established By IRS For Matching Contributions	$ 255,000	$ 250,000	$ 245,000
Employer Contribution Amount	3,400,000	3,200,000	3,100,000
Years Of Service For Supplemental Retirement Contribution				10
Age Of Employee For Supplemental Retirement Contribution				40
Annual Supplemental Retirement Contribution And Credit Total.	60,000	78,000	62,000
Separate Unrestricted Cash For Deferred Compensation Plan.	16,600,000	12,200,000		16,600,000	16,600,000
Deferred Compensation Liability	$ 16,600,000	$ 12,200,000		$ 16,600,000	$ 16,600,000

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Unsecured Exchangeable Senior Notes

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Unsecured Exchangeable Senior Notes

Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate		Effective Rate (1)		Exchange Rate		Principal Amount			First Optional Redemption Date by the Company	Maturity Date
3.625% Exchangeable Senior Notes	3.625	%	4.037	%	8.6974	(2)	$	747,500		N/A	February 15, 2014
Net unamortized discount							(182		)
Adjustment for the equity component allocation, net of accumulated amortization							(2,438		)
Total							$	744,880

 _______________

(1) Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustments), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. In connection with the special dividend declared on November 27, 2013, the exchange rate of 8.5051 was adjusted to 8.6974 shares per $1,000 principal amount of notes effective as of December 31, 2013, resulting in an exchange price of approximately $114.98 per share of Boston Properties, Inc.'s common stock. As of December 31, 2013, the effective exchange price was $130.21 per share. The Operating Partnership repaid the notes on February 18, 2014 (See Note 20).

ASC 470-20 requires the liability and equity components of convertible debt instruments that may be settled in cash upon conversion (including partial cash settlement) to be separately accounted for in a manner that reflects the issuer’s nonconvertible debt borrowing rate. ASC 470-20 requires that the initial proceeds from the sale of the Operating Partnership’s $862.5 million of 2.875% exchangeable senior notes due 2037 (all of which had been redeemed/repurchased as of December 31, 2012), $450.0 million of 3.75% exchangeable senior notes due 2036 (all of which have been redeemed/repurchased as of December 31, 2013) and $747.5 million of 3.625% exchangeable senior notes due 2014 (see Note 20) be allocated between a liability component and an equity component in a manner that reflects interest expense at the interest rate of similar nonconvertible debt that could have been issued by the Operating Partnership at such time. The Company measured the fair value of the debt components of the 2.875%, 3.75% and 3.625% exchangeable senior notes for the periods presented based on effective interest rates of 5.630%, 5.958% and 6.555%, respectively. The aggregate carrying amount of the debt component was approximately $744.9 million and $1.17 billion (net of equity component allocation adjustment of approximately $2.4 million and $25.5 million) at December 31, 2013 and December 31, 2012, respectively. As a result, the Company attributed an aggregate of approximately $230.3 million of the proceeds to the equity component of the notes, which represents the excess proceeds received over the fair value of the notes at the date of issuance. The equity component of the notes has been reflected within Additional Paid-in Capital in the Consolidated Balance Sheets. The Company reclassified approximately $1.0 million of deferred financing costs to Additional Paid-in Capital, which represented the costs attributable to the equity components of the notes. The carrying amount of the equity component was approximately $91.9 million and $148.5 million at December 31, 2013 and December 31, 2012, respectively. The resulting debt discount has been amortized over the period during which the debt was expected to be outstanding (i.e., through the first optional redemption dates or, in the case of the 2014 notes, the maturity date) as additional non-cash interest expense. The aggregate contractual interest expense was approximately $34.8 million, $48.4 million and $66.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. As a result, the Company reported additional non-cash interest expense of approximately $23.1 million, $29.1 million and $38.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.

On April 15, 2013, the Company announced that holders of its Operating Partnership's 3.75% Exchangeable Senior Notes due 2036 (the “Notes”) had the right to surrender their Notes for purchase by the Operating Partnership (the “Put Right”) on May 18, 2013. On April 15, 2013, the Company also announced that the Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on May 18, 2013 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the notice of redemption, holders of the Notes had the right to exchange their Notes on or prior to May 16, 2013. Notes with respect to which the Put Right was not exercised and that were not surrendered for exchange on or prior to May 16, 2013, were redeemed by the Operating Partnership at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon to, but excluding, the Redemption Date. Based on final information provided to the Operating Partnership by the trustee for the Notes, no Notes were validly tendered and accepted for purchase in the Put Right. Pursuant to the notice of redemption, an aggregate principal amount of $990,000 of the Notes was redeemed on May 18, 2013. The remaining aggregate principal amount of $449,010,000 of the Notes was surrendered for exchange and, in addition to the repayment of the principal in cash, the Company issued an aggregate of 419,116 shares of its common stock in exchange for the Notes (See Note 12). The Company recognized a loss on early extinguishment of debt totaling approximately $0.1 million consisting of transaction costs.

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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 576,199,000	$ 571,481,000	$ 510,033,000	$ 477,826,000	$ 478,047,000	$ 464,220,000	$ 466,197,000	$ 438,722,000	$ 2,135,539,000		$ 1,847,186,000		$ 1,722,792,000
Expenses
Depreciation and amortization									560,637,000		445,875,000		429,742,000
Total expenses									1,457,419,000		1,206,865,000		1,117,626,000
Operating income									678,120,000		640,321,000		605,166,000
Other income (expense)
Interest expense									(446,880,000)		(410,970,000)		(391,533,000)
Losses from early extinguishments of debt									122,000		(4,453,000)		(1,494,000)
Income (loss) from continuing operations	79,395,000	82,311,000	503,446,000	38,496,000	74,251,000	63,331,000	94,795,000	53,079,000	703,648,000		285,456,000		302,950,000
Net income (loss)									841,440,000		332,139,000		313,826,000
Income from unconsolidated joint ventures									75,074,000		49,078,000		85,896,000
Straight-line rent adjustments									65,800,000		77,600,000		77,000,000
Above and below market rent adjustments, net									28,000,000		14,600,000		10,800,000
Gain on consolidation of joint ventures									385,991,000		0		0
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue									311,548,000	[1]	564,205,000	[1]	589,294,000	[1]
Expenses
Operating									105,319,000		162,665,000		170,404,000
Depreciation and amortization									86,088,000		163,134,000		190,437,000
Impairment losses									0		0		40,468,000
Total expenses									191,407,000		325,799,000		401,309,000
Operating income									120,141,000		238,406,000		187,985,000
Other income (expense)
Interest expense									(112,535,000)		(224,645,000)		(228,494,000)
Losses from early extinguishments of debt									(1,677,000)		0		0
Income (loss) from continuing operations									5,929,000		13,761,000		(40,509,000)
Gains on sale of real estate									14,207,000		990,000		0
Net income (loss)									20,136,000		14,751,000		(40,509,000)
Company's share of net income (loss)									4,612,000		6,863,000		(25,374,000)
Gains on sale of real estate									54,501,000		0		46,166,000
Basis differential									(1,017,000)		1,732,000		27,226,000
Elimination of inter-entity interest on partner loan									16,978,000		40,483,000		37,878,000
Income from unconsolidated joint ventures									75,074,000		49,078,000		85,896,000
Straight-line rent adjustments									7,800,000		12,000,000		21,900,000
Above and below market rent adjustments, net									33,700,000		91,100,000		120,300,000
Lease termination income									19,600,000
Company's share of lease termination income									11,800,000
Gain on consolidation of joint ventures									$ 385,991,000		$ 0		$ 0

[1] Includes straight-line rent adjustments of $7.8 million, $12.0 million and $21.9 million for the years ended December 31, 2013, 2012 and 2011, respectively. Includes net below-market rent adjustments of $33.7 million, $91.1 million and $120.3 million for the years ended December 31, 2013, 2012 and 2011, respectively. Total revenue for the year ended December 31, 2012 includes termination income totaling approximately $19.6 million (of which the Company's share is approximately $11.8 million) related to a lease termination with a tenant at 767 Fifth Avenue (The General Motors Building).

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Mortgage Notes Payable

12 Months Ended

Dec. 31, 2013

Loans Payable [Abstract]

Mortgage Notes Payable

Mortgage Notes Payable

The Company had outstanding mortgage notes payable totaling approximately $4.4 billion and $3.1 billion as of December 31, 2013 and 2012, respectively, each collateralized by one or more buildings and related land included in real estate assets. The mortgage notes payable are generally due in monthly installments and mature at various dates through April 10, 2022.

 Fixed rate mortgage notes payable totaled approximately $4.4 billion and $3.1 billion at December 31, 2013 and 2012, respectively, with contractual interest rates ranging from 4.75% to 7.69% per annum at December 31, 2013 and 4.75% to 9.93% per annum at December 31, 2012 (with weighted-averages of 5.70% (excluding the mezzanine notes payable) and 5.65% at December 31, 2013 and 2012, respectively).

There were no variable rate mortgage loans at December 31, 2013 and December 31, 2012. As of December 31, 2013 and 2012, the LIBOR rate was 0.17% and 0.21%, respectively.

On February 5, 2013, the Company used available cash to repay the mortgage loan collateralized by its Kingstowne One property located in Alexandria, Virginia totaling approximately $17.0 million. The mortgage loan bore interest at a fixed rate of 5.96% per annum and was scheduled to mature on May 5, 2013. There was no prepayment penalty.

On February 20, 2013, the foreclosure sale of the Company's Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million. The operating results of the property through the date of ratification have been classified as discontinued operations on a historical basis for all periods (See Note 3).

On April 1, 2013, the Company used available cash to repay the mortgage loan collateralized by its 140 Kendrick Street property located in Needham, Massachusetts totaling approximately $47.6 million. The mortgage loan bore interest at a fixed rate of 7.51% per annum and was scheduled to mature on July 1, 2013. There was no prepayment penalty. The Company recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

On May 31, 2013, in conjunction with the consolidation of the Company's 767 Venture, LLC joint venture (the entity that owns 767 Fifth Avenue (the General Motors Building), the Company recorded mortgage loans collateralized by the property aggregating $1.3 billion and mezzanine loans aggregating $306.0 million. The mortgage loans require interest-only payments at a weighted-average fixed interest rate of 5.95% per annum and mature on October 7, 2017. The mezzanine loans require interest-only payments at a weighted-average fixed interest rate of 6.02% per annum and mature on October 7, 2017. The mortgage loans and mezzanine loans were recorded at their fair values aggregating approximately $1.5 billion and $311.7 million, respectively, using weighted-average effective interest rates of approximately 2.44% and 5.53% per annum, respectively. In addition, in conjunction with the consolidation, the Company recorded loans payable to the joint venture's partners totaling $450.0 million and related accrued interest payable totaling approximately $175.8 million. The member loans bear interest at a fixed rate of 11.0% per annum and mature on June 9, 2017. The member loans consist of the portion of the original purchase price for the property that was financed with loans from the joint venture's partners on a pro rata basis. The Company has eliminated in consolidation its member loan totaling $270.0 million and its share of the related accrued interest payable of approximately $114.5 million at December 31, 2013. The remaining notes payable to the outside joint venture partners and related accrued interest payable totaling $180.0 million and approximately $76.4 million as of December 31, 2013 have been reflected as Outside Members' Notes Payable and within Accrued Interest Payable, respectively, on the Consolidated Balance Sheets (See Note 3). The related interest expense from the Outside Members' Notes Payable totaling approximately $16.0 million for the period from May 31, 2013 through December 31, 2013 is fully allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in the Company's Consolidated Statements of Operations.

Four mortgage loans totaling approximately $2.2 billion at December 31, 2013 and five mortgage loans totaling approximately $951.5 million at December 31, 2012 have been accounted for at their fair values on the dates the mortgage loans were assumed. The impact of recording the mortgage loans at fair value resulted in a decrease to interest expense of approximately $34.4 million, $7.0 million and $9.2 million for the years ended December 31, 2013, 2012 and 2011, respectively. The cumulative liability related to the fair value adjustments was $191.2 million and $38.6 million at December 31, 2013 and 2012, respectively, and is included in mortgage notes payable in the Consolidated Balance Sheets.

Contractual aggregate principal payments of mortgage notes payable at December 31, 2013 are as follows: 

	Principal Payments
	(in thousands)
2014	$	87,759
2015	26,182
2016	608,879
2017	2,821,750
2018	18,633
Thereafter	695,327
Total aggregate principal payments	4,258,530
Unamortized balance of historical fair value adjustments	191,204
Total carrying value of mortgage notes payable	$	4,449,734

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Unsecured Senior Notes

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Unsecured Senior Notes

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2013 (dollars in thousands):

	Coupon/ Stated Rate		Effective Rate(1)		Principal Amount			Maturity Date(2)
12 Year Unsecured Senior Notes	5.625	%	5.693	%	$	300,000		April 15, 2015
12 Year Unsecured Senior Notes	5.000	%	5.194	%	250,000			June 1, 2015
10 Year Unsecured Senior Notes	5.875	%	5.967	%	700,000			October 15, 2019
10 Year Unsecured Senior Notes	5.625	%	5.708	%	700,000			November 15, 2020
10 Year Unsecured Senior Notes	4.125	%	4.289	%	850,000			May 15, 2021
7 Year Unsecured Senior Notes	3.700	%	3.853	%	850,000			November 15, 2018
11 Year Unsecured Senior Notes	3.850	%	3.954	%	1,000,000			February 1, 2023
10.5 Year Unsecured Senior Notes	3.125	%	3.279	%	500,000			September 1, 2023
10.5 Year Unsecured Senior Notes	3.800	%	3.916	%	700,000			February 1, 2024
Total principal					5,850,000
Net unamortized discount					(14,146		)
Total					$	5,835,854

 _______________

(1) Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.

(2) No principal amounts are due prior to maturity.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At December 31, 2013, the Company was in compliance with each of these financial restrictions and requirements.

On April 11, 2013, the Company's Operating Partnership completed a public offering of $500.0 million in aggregate principal amount of its 3.125% senior unsecured notes due 2023. The notes were priced at 99.379% of the principal amount to yield an effective rate (including financing fees) of 3.279% to maturity. The notes will mature on September 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $492.5 million after deducting underwriting discounts and transaction expenses.

On June 27, 2013, the Company's Operating Partnership completed a public offering of $700.0 million in aggregate principal amount of its 3.800% senior unsecured notes due 2024. The notes were priced at 99.694% of the principal amount to yield an effective rate (including financing fees) of 3.916% to maturity. The notes will mature on February 1, 2024, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $691.9 million after deducting the underwriting discount and transaction expenses.

XML

Unsecured Line of Credit

12 Months Ended

Dec. 31, 2013

Unsecured Line of Credit [Abstract]

Unsecured Line of Credit [Text Block]

9.    Unsecured Line of Credit

On July 26, 2013, the Company's Operating Partnership amended and restated the revolving credit agreement governing the Company's Unsecured Line of Credit, which, among other things, (1) increased the total commitment from $750.0 million to $1.0 billion, (2) extended the maturity date from June 24, 2014 to July 26, 2018 and (3) reduced the per annum variable interest rates and other fees. The Operating Partnership may increase the total commitment to $1.5 billion, subject to syndication of the increase and other conditions. At the Operating Partnership’s option, loans outstanding under the Unsecured Line of Credit will bear interest at a rate per annum equal to (1), in the case of loans denominated in Dollars, Euro or Sterling, LIBOR or, in the case of loans denominated in Canadian Dollars, CDOR, in each case, plus a margin ranging from 0.925% to 1.70% based on the Operating Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Administrative Agent’s prime rate, (b) the Federal Funds rate plus 0.5% or (c) LIBOR for a one month period plus 1.00%, in each case, plus a margin ranging from 0.0% to 0.70% based on the Operating Partnership’s credit rating. The Unsecured Line of Credit also contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loan advances to the Operating Partnership at a reduced interest rate. In addition, the Operating Partnership is also obligated to pay (1) in quarterly installments a facility fee on the total commitment at a rate per annum ranging from 0.125% to 0.35% based on the Operating Partnership’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit equal to the LIBOR margin. Based on the Operating Partnership’s current credit rating, the LIBOR and CDOR margin is 1.00%, the alternate base rate margin is 0.0% and the facility fee is 0.15%. At December 31, 2013 and 2012, there were no amounts outstanding on the Unsecured Line of Credit.

The terms of the Unsecured Line of Credit require that the Company maintain a number of customary financial and other covenants on an ongoing basis, including: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments. At December 31, 2013, the Company was in compliance with each of these financial and other covenant requirements.

XML

Unsecured Senior Notes Schedule of Unsecured Senior Notes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Coupon/Stated Rate	3.625%
Effective Rate	4.037%	[1]
Principal Amount	$ 747,500
Maturity date	Feb. 15, 2014
Net unamortized discount	(14,146)		(10,472)
Total	5,835,854		4,639,528
Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount	5,850,000
Net unamortized discount	(14,146)
Total	5,835,854
Senior Notes [Member] | Twelve Year Unsecured Senior Notes Five Point Six Nine Three Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	5.625%
Effective Rate	5.693%	[2]
Principal Amount	300,000
Maturity date	Apr. 15, 2015	[3]
Senior Notes [Member] | Twelve Year Unsecured Senior Notes Five Point One Nine Four Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	5.00%
Effective Rate	5.194%	[2]
Principal Amount	250,000
Maturity date	Jun. 01, 2015	[3]
Senior Notes [Member] | Ten Year Unsecured Senior Notes Five Point Nine Six Seven Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	5.875%
Effective Rate	5.967%	[2]
Principal Amount	700,000
Maturity date	Oct. 15, 2019	[3]
Senior Notes [Member] | Ten Year Unsecured Senior Notes Five Point Seven Zero Eight Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	5.625%
Effective Rate	5.708%	[2]
Principal Amount	700,000
Maturity date	Nov. 15, 2020	[3]
Senior Notes [Member] | Ten Year Unsecured Senior Notes Four Point Two Eight Nine Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	4.125%
Effective Rate	4.289%	[2]
Principal Amount	850,000
Maturity date	May 15, 2021	[3]
Senior Notes [Member] | Seven Year Unsecured Senior Notes Three Point Eight Five Three Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	3.70%
Effective Rate	3.853%	[2]
Principal Amount	850,000
Maturity date	Nov. 15, 2018	[3]
Senior Notes [Member] | Eleven Year Unsecured Senior Notes Three Point Nine Five Four Percent
Debt Instrument [Line Items]
Coupon/Stated Rate	3.85%
Effective Rate	3.954%	[2]
Principal Amount	1,000,000
Maturity date	Feb. 01, 2023	[3]
Senior Notes [Member] | Ten and Half Year Unsecured Senior Notes Three Point Two Seven Nine Percent [Member]
Debt Instrument [Line Items]
Coupon/Stated Rate	3.125%
Effective Rate	3.279%	[2]
Principal Amount	500,000
Maturity date	Sep. 01, 2023
Senior Notes [Member] | Ten and Half Year Unsecured Senior Notes Three Point Nine One Six Percent [Member]
Debt Instrument [Line Items]
Coupon/Stated Rate	3.80%
Effective Rate	3.916%	[2]
Principal Amount	$ 700,000
Maturity date	Feb. 01, 2024

[1] Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

[2] Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.

[3] No principal amounts are due prior to maturity.

XML

Stock Option and Incentive Plan (Narrative) (Details) (USD $)				0 Months Ended			0 Months Ended							9 Months Ended	12 Months Ended		0 Months Ended
	Jan. 31, 2014	Mar. 11, 2013	Dec. 31, 2011	May 15, 2012 Two Thousand Twelve Stock Option and Incentive Plan [Member] Y	Jan. 28, 2013 MYLTIP 2013 [Member] Y indices	Dec. 31, 2013 MYLTIP 2013 [Member]	Jan. 28, 2013 Exceptional [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 Minimum [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 Maximum [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 Threshold [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 Target [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 High [Member] MYLTIP 2013 [Member]	Apr. 02, 2013 Chief Executive Officer [Member]	Sep. 30, 2013 Board of Directors Chairman [Member]	Dec. 31, 2013 Board of Directors Chairman [Member]	Mar. 11, 2013 Board of Directors Chairman [Member]	Jan. 28, 2013 Cohen & Steers Realty Majors Portfolio Index [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 NAREIT Office Index adjusted [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 MYLTIP Vesting 2016 [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 MYLTIP Vesting 2017 [Member] MYLTIP 2013 [Member]	Jan. 28, 2013 MYLTIP Vesting 2018 [Member] MYLTIP 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Tiers					4
TRS measurement (in years)					3
Vesting Percentage																			25.00%	25.00%	50.00%
Vesting Date																			Feb. 04, 2016	Feb. 04, 2017	Feb. 04, 2018
Distributions percent before measurement date					10.00%
Number of Additional Shares Authorized				13,000,000
Other Than Stock Options Awards Conversion Ratio				2.32
Stock Option Awards Conversion Ratio				1.0
Stock Option and Incentive Plan Term Period				10
Weighted Percentage of Index Used to Compare to TRS																	50.00%	50.00%
Potential Awards Earned								$ 0	$ 30,700,000
Indices Used to Compare TRS					2
Amount of Each Tier							30,700,000			5,100,000	10,200,000	20,500,000
Percentage of annualized TRS for Reduction of Earned Awards					2.00%
Percentage to Cause Some Awards to be Earned Even if on a Relative Basis it Would Not Result in any Earned Awards					10.00%
LTIP units issued (in shares)	109,718												24,231
MYLTIP units issued						318,926							38,926
Non-qualified stock options issued (in shares)			146,844										50,847
Cash Payment Related to Transition Agreement		6,700,000
Target Equity Award Compensation Associated with Transition Agreement																11,100,000
Compensation Expense associated with Transition Agreement															13,800,000
Acceleration of Stock Based Compensation in Association with Transition Agreement														12,900,000
Value of MYLTIP Awards					$ 9,200,000
MYLTIP Value Amortized Into Earnings, Years					5

XML

Unsecured Exchangeable Senior Notes (Schedule of Unsecured Exchangeable Senior Notes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Aug. 19, 2008	Aug. 13, 2008
Debt Disclosure [Abstract]
Coupon/Stated Rate	3.625%
Effective Rate	4.037%	[1]
Exchange Rate (in shares)	8.6974	[2]
Principal Amount	$ 747,500,000
Net unamortized discount	(182,000)		(1,653,000)
Adjustment for the equity component allocation, net of accumulated amortization	(2,438,000)		(25,500,000)
Total	744,880,000		1,170,356,000
Maturity date	Feb. 15, 2014
Initial exchange on principal amount of note	1,000			1,000
Revised exchange price due to special dividend	$ 114.98
Initial exchange price per share				$ 117.58
Revised exchange price due to capped call transaction				$ 137.17
Premium over closing price				40.00%
Closing price per share of common stock (in dollars per share)					$ 97.98
Net cost of capped call transaction				$ 44,400,000
Revised exchange rate	8.6974
Effective exchange price	$ 130.21
Initial exchange rate (in shares)				8.5051

[1] Yield on issuance date including the effects of discounts on the notes but excluding the effects of the adjustment for the equity component allocation.

[2] The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustments), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. In connection with the special dividend declared on November 27, 2013, the exchange rate of 8.5051 was adjusted to 8.6974 shares per $1,000 principal amount of notes effective as of December 31, 2013, resulting in an exchange price of approximately $114.98 per share of Boston Properties, Inc.'s common stock. As of December 31, 2013, the effective exchange price was $130.21 per share. The Operating Partnership repaid the notes on February 18, 2014 (See Note 20).

XML

Mortgage Notes Payable (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	7 Months Ended	0 Months Ended	12 Months Ended						0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 05, 2013 Kingstowne One [Member]	Dec. 31, 2013 140 Kendrick [Member]	May 31, 2013 767 5th Avenue (The General Motors Building) [Member]	Dec. 31, 2013 767 5th Avenue (The General Motors Building) [Member]	Feb. 20, 2013 Montvale Center [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2013 Fixed Rate Mortgages [Member]	Dec. 31, 2012 Fixed Rate Mortgages [Member]	Dec. 31, 2013 Variable Rate Mortgages [Member]	Dec. 31, 2012 Variable Rate Mortgages [Member]	May 31, 2013 Mezzanine Debt [Member] 767 5th Avenue (The General Motors Building) [Member]	May 31, 2013 First Mortgage [Member] 767 5th Avenue (The General Motors Building) [Member]	Dec. 31, 2013 Company [Member] 767 5th Avenue (The General Motors Building) [Member]	Dec. 31, 2013 Consolidation, Eliminations [Member] 767 5th Avenue (The General Motors Building) [Member]
Mortgage Notes Payable [Line Items]
Mortgage notes payable	$ 4,449,734,000	$ 3,102,485,000									$ 4,400,000,000	$ 3,100,000,000
Number Real Estate Assets Used For Mortgage Loan Collateral									1	1
Final maturity date of mortgage notes	Apr. 10, 2022
Contractual interest rate range, inimum											4.75%	4.75%
Contractual interest rate range, maximum											7.69%	9.93%
Contractual interest rate, weighted vverage interest rate											5.70%	5.65%
Number of variable rate mortgage loans													0	0
London Interbank Offered Rate													0.17%	0.21%
Maturity date	Feb. 15, 2014			May 05, 2013	Jul. 01, 2013	Jun. 09, 2017									Oct. 07, 2017	Oct. 07, 2017
Amount of debt extinguished								25,000,000
Gain on forgiveness of debt from discontinued operations	20,182,000	0	0					20,200,000
Repayments of mortgage notes payable	80,311,000	253,877,000	1,251,841,000	17,000,000	47,600,000
Interest at a fixed rate	3.625%			5.96%	7.51%	11.00%									6.02%	5.95%
Penalty for early repayment of debt				0.0	0
Gains (losses) from early extinguishments of debt	122,000	(4,453,000)	(1,494,000)		300,000
Debt recorded upon consolidation															306,000,000	1,300,000,000
Number Of Mortgage Loans Accounted For Fair Value	4	5
Outstanding balance of mortgage loans accounted for at fair value	2,200,000,000	951,500,000
nterest Expense Decrease Due To Recording Mortgage Loans At Fair Value	34,400,000	7,000,000	9,200,000
Cumulative Liability Related to the Fair Value of Debt Adjustment	191,200,000	38,600,000
Mortgage Loans Accounted For At Fair Value Upon Consolidation															311,700,000	1,500,000,000
Interest Rate Used To Account For Mortgage Loan At Fai rValue Upon Consolidation															5.53%	2.44%
Outside members' notes payable	180,000,000	0				450,000,000											180,000,000	270,000,000
Interest Payable	167,523,000	72,461,000				175,800,000											76,400,000	114,500,000
Interest Expense, Related Party							$ 16,000,000

XML

Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]
Type	Office
Location	Reston, VA
Encumbrances	$ 4,449,734,000	[1]
Original Land	4,303,172,000
Original Building	10,631,057,000
Costs Capitalized Subsequent to Acquisition	4,019,372,000
Land and improvements	4,450,532,000
Buildings and Improvements	12,682,514,000
Land Held for Development	297,376,000
Development and Construction in Progress	1,523,179,000
Total	18,953,601,000
Accumulated Depreciation	3,145,701,000
Furniture, fixtures and equipment	25,164,000		23,441,000
Furniture, fixtures and equipment accumulated depreciation	15,870,000
Real Estate Aggregate Cost For Tax Purposes	14,800,000,000
Real Estate Aggregate Accumulated Depreciation For Tax Purposes	2,600,000,000
Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years 0 months 0 days
Unamoritized balance of histroical fair value adjustments	191,204,000
767 5th Avenue (The General Motors Building) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	767 Fifth Avenue (The General Motors Building)
Type	Office
Location	New York, NY
Encumbrances	1,463,143,000
Original Land	1,796,252,000
Original Building	1,532,654,000
Costs Capitalized Subsequent to Acquisition	4,481,000
Land and improvements	1,796,252,000
Buildings and Improvements	1,537,135,000
Land Held for Development	0
Development and Construction in Progress	0
Total	3,333,387,000
Accumulated Depreciation	28,901,000
Year(s) built / renovated	1968
Depreciable Lives (Years)	-1	[2]
Embarcadero Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Embarcadero Center
Type	Office
Location	San Francisco, CA
Encumbrances	360,133,000
Original Land	179,697,000
Original Building	847,410,000
Costs Capitalized Subsequent to Acquisition	314,292,000
Land and improvements	195,985,000
Buildings and Improvements	1,145,414,000
Land Held for Development	0
Development and Construction in Progress	0
Total	1,341,399,000
Accumulated Depreciation	472,324,000
Year(s) built / renovated	1970/1989
Depreciable Lives (Years)	-1	[2]
Prudential Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Prudential Center
Type	Office
Location	Boston, MA
Original Land	92,077,000
Original Building	734,594,000
Costs Capitalized Subsequent to Acquisition	354,501,000
Land and improvements	107,426,000
Buildings and Improvements	1,057,815,000
Land Held for Development	15,931,000
Development and Construction in Progress	0
Total	1,181,172,000
Accumulated Depreciation	398,909,000
Year(s) built / renovated	1965/1993/2002
Depreciable Lives (Years)	-1	[2]
399 Park Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	399 Park Avenue
Type	Office
Location	New York, NY
Original Land	339,200,000
Original Building	700,358,000
Costs Capitalized Subsequent to Acquisition	107,604,000
Land and improvements	354,107,000
Buildings and Improvements	793,055,000
Land Held for Development	0
Development and Construction in Progress	0
Total	1,147,162,000
Accumulated Depreciation	219,938,000
Year(s) built / renovated	1961
Depreciable Lives (Years)	-1	[2]
601 Lexington Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	601 Lexington Avenue
Type	Office
Location	New York, NY
Encumbrances	722,253,000
Original Land	241,600,000
Original Building	494,782,000
Costs Capitalized Subsequent to Acquisition	217,155,000
Land and improvements	289,639,000
Buildings and Improvements	663,898,000
Land Held for Development	0
Development and Construction in Progress	0
Total	953,537,000
Accumulated Depreciation	205,721,000
Year(s) built / renovated	1977/1997
Depreciable Lives (Years)	-1	[2]
The John Hancock Tower And Garage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	The John Hancock Tower and Garage
Type	Office
Location	Boston, MA
Encumbrances	652,933,000
Original Land	219,543,000
Original Building	667,884,000
Costs Capitalized Subsequent to Acquisition	57,420,000
Land and improvements	219,616,000
Buildings and Improvements	724,812,000
Land Held for Development	419,000
Development and Construction in Progress	0
Total	944,847,000
Accumulated Depreciation	78,366,000
Year(s) built / renovated	1976
Depreciable Lives (Years)	-1	[2]
Times Square Tower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Times Square Tower
Type	Office
Location	New York, NY
Original Land	165,413,000
Original Building	380,438,000
Costs Capitalized Subsequent to Acquisition	85,146,000
Land and improvements	169,193,000
Buildings and Improvements	461,804,000
Land Held for Development	0
Development and Construction in Progress	0
Total	630,997,000
Accumulated Depreciation	137,934,000
Year(s) built / renovated	2004
Depreciable Lives (Years)	-1	[2]
100 Federal Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	100 Federal Street
Type	Office
Location	Boston, MA
Original Land	131,067,000
Original Building	435,954,000
Costs Capitalized Subsequent to Acquisition	6,020,000
Land and improvements	131,067,000
Buildings and Improvements	441,760,000
Land Held for Development	214,000
Development and Construction in Progress	0
Total	573,041,000
Accumulated Depreciation	29,060,000
Year(s) built / renovated	1971-1975
Depreciable Lives (Years)	-1	[2]
Carnegie Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Carnegie Center
Type	Office
Location	Princeton, NJ
Original Land	105,107,000
Original Building	377,259,000
Costs Capitalized Subsequent to Acquisition	66,866,000
Land and improvements	103,064,000
Buildings and Improvements	443,817,000
Land Held for Development	2,206,000
Development and Construction in Progress	145,000
Total	549,232,000
Accumulated Depreciation	169,587,000
Year(s) built / renovated	1983-1999
Depreciable Lives (Years)	-1	[2]
Atlantic Wharf [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Atlantic Wharf
Type	Office
Location	Boston, MA
Original Land	63,988,000
Original Building	454,537,000
Costs Capitalized Subsequent to Acquisition	11,644,000
Land and improvements	63,988,000
Buildings and Improvements	466,181,000
Land Held for Development	0
Development and Construction in Progress	0
Total	530,169,000
Accumulated Depreciation	39,697,000
Year(s) built / renovated	2011
Depreciable Lives (Years)	-1	[2]
Fountain Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Fountain Square
Type	Office
Location	Reston, VA
Encumbrances	226,604,000
Original Land	56,853,000
Original Building	306,298,000
Costs Capitalized Subsequent to Acquisition	3,877,000
Land and improvements	56,853,000
Buildings and Improvements	310,175,000
Land Held for Development	0
Development and Construction in Progress	0
Total	367,028,000
Accumulated Depreciation	15,460,000
Year(s) built / renovated	1986-1990
Depreciable Lives (Years)	-1	[2]
510 Madison Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	510 Madison Avenue
Type	Office
Location	New York, NY
Original Land	103,000,000
Original Building	253,665,000
Costs Capitalized Subsequent to Acquisition	6,309,000
Land and improvements	103,000,000
Buildings and Improvements	259,974,000
Land Held for Development	0
Development and Construction in Progress	0
Total	362,974,000
Accumulated Depreciation	15,901,000
Year(s) built / renovated	2012
Depreciable Lives (Years)	-1	[2]
599 Lexington Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	599 Lexington Avenue
Type	Office
Location	New York, NY
Encumbrances	750,000,000
Original Land	81,040,000
Original Building	100,507,000
Costs Capitalized Subsequent to Acquisition	123,179,000
Land and improvements	87,852,000
Buildings and Improvements	216,874,000
Land Held for Development	0
Development and Construction in Progress	0
Total	304,726,000
Accumulated Depreciation	144,094,000
Year(s) built / renovated	1986
Depreciable Lives (Years)	-1	[2]
Gateway Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Gateway Center
Type	Office
Location	San Francisco, CA
Original Land	28,255,000
Original Building	139,245,000
Costs Capitalized Subsequent to Acquisition	51,330,000
Land and improvements	30,627,000
Buildings and Improvements	188,203,000
Land Held for Development	0
Development and Construction in Progress	0
Total	218,830,000
Accumulated Depreciation	80,461,000
Year(s) built / renovated	1984/1986/2002
Depreciable Lives (Years)	-1	[2]
Bay Colony Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Bay Colony Corporate Center
Type	Office
Location	Waltham, MA
Original Land	18,789,000
Original Building	148,451,000
Costs Capitalized Subsequent to Acquisition	47,332,000
Land and improvements	18,789,000
Buildings and Improvements	195,783,000
Land Held for Development	0
Development and Construction in Progress	0
Total	214,572,000
Accumulated Depreciation	21,339,000
Year(s) built / renovated	1985-1989
Depreciable Lives (Years)	-1	[2]
South of Market and Democracy Tower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	South of Market and Democracy Tower
Type	Office
Location	Reston, VA
Original Land	13,603,000
Original Building	237,479,000
Costs Capitalized Subsequent to Acquisition	9,790,000
Land and improvements	13,687,000
Buildings and Improvements	247,185,000
Development and Construction in Progress	0
Accumulated Depreciation	50,831,000
Year(s) built / renovated	2008-2009
Depreciable Lives (Years)	-1	[2]
Mountain View Research [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Mountain View Research Park
Type	Office
Location	Mountain View, CA
Original Land	106,162,000
Original Building	76,137,000
Costs Capitalized Subsequent to Acquisition	2,196,000
Land and improvements	106,162,000
Buildings and Improvements	78,333,000
Land Held for Development	0
Development and Construction in Progress	0
Total	184,495,000
Accumulated Depreciation	3,013,000
Year(s) built / renovated	1977-1981/2007-2013
Depreciable Lives (Years)	-1	[2]
2200 Pennsylvania Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	2200 Pennsylvania Avenue
Type	Office
Location	Washington, DC
Original Building	183,541,000
Costs Capitalized Subsequent to Acquisition	3,767,000
Land and improvements	0
Buildings and Improvements	187,308,000
Land Held for Development	0
Development and Construction in Progress	0
Total	187,308,000
Accumulated Depreciation	18,185,000
Year(s) built / renovated	2011
Depreciable Lives (Years)	-1	[2]
One and Two Patriots Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	One and Two Patriots Park
Original Land	18,429,000
Original Building	126,315,000
Costs Capitalized Subsequent to Acquisition	34,994,000
Land and improvements	22,352,000
Buildings and Improvements	157,386,000
Land Held for Development	0
Development and Construction in Progress	0
Total	179,738,000
Accumulated Depreciation	7,032,000
Year(s) built / renovated	1987/1988/2012/2013
Depreciable Lives (Years)	-1	[2]
Reservoir Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Reservoir Place
Type	Office
Location	Waltham, MA
Original Land	18,605,000
Original Building	92,619,000
Costs Capitalized Subsequent to Acquisition	27,446,000
Land and improvements	20,118,000
Buildings and Improvements	118,552,000
Land Held for Development	0
Development and Construction in Progress	0
Total	138,670,000
Accumulated Depreciation	52,829,000
Year(s) built / renovated	1955/1987
Depreciable Lives (Years)	-1	[2]
3200 Zanker Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	3200 Zanker Road
Type	Office
Location	San Jose, CA
Original Land	36,705,000
Original Building	82,863,000
Costs Capitalized Subsequent to Acquisition	24,669,000
Land and improvements	36,997,000
Buildings and Improvements	103,496,000
Land Held for Development	3,744,000
Development and Construction in Progress	0
Total	144,237,000
Accumulated Depreciation	23,165,000
Year(s) built / renovated	1988
Depreciable Lives (Years)	-1	[2]
505 9th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	505 9th Street
Type	Office
Location	Washington, DC
Encumbrances	121,360,000
Original Land	38,885,000
Original Building	83,719,000
Costs Capitalized Subsequent to Acquisition	5,692,000
Land and improvements	42,082,000
Buildings and Improvements	86,214,000
Land Held for Development	0
Development and Construction in Progress	0
Total	128,296,000
Accumulated Depreciation	20,358,000
Year(s) built / renovated	2007
Depreciable Lives (Years)	-1	[2]
1333 New Hampshire Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	1333 New Hampshire Avenue
Type	Office
Location	Washington, DC
Original Land	34,032,000
Original Building	85,660,000
Costs Capitalized Subsequent to Acquisition	9,061,000
Land and improvements	35,394,000
Buildings and Improvements	93,359,000
Land Held for Development	0
Development and Construction in Progress	0
Total	128,753,000
Accumulated Depreciation	30,392,000
Year(s) built / renovated	1996
Depreciable Lives (Years)	-1	[2]
Kingstowne Towne Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Kingstowne Towne Center
Type	Office
Location	Alexandria, VA
Encumbrances	33,338,000
Original Land	18,021,000
Original Building	109,038,000
Costs Capitalized Subsequent to Acquisition	742,000
Land and improvements	18,062,000
Buildings and Improvements	109,739,000
Land Held for Development	0
Development and Construction in Progress	0
Total	127,801,000
Accumulated Depreciation	26,526,000
Year(s) built / renovated	2003-2006
Depreciable Lives (Years)	-1	[2]
Capital Gallery [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Capital Gallery
Type	Office
Location	Washington, DC
Original Land	4,725,000
Original Building	29,565,000
Costs Capitalized Subsequent to Acquisition	86,993,000
Land and improvements	8,662,000
Buildings and Improvements	112,621,000
Land Held for Development	0
Development and Construction in Progress	0
Total	121,283,000
Accumulated Depreciation	50,217,000
Year(s) built / renovated	1981/2006
Depreciable Lives (Years)	-1	[2]
1330 Connecticut Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	1330 Connecticut Avenue
Type	Office
Location	Washington, DC
Original Land	25,982,000
Original Building	82,311,000
Costs Capitalized Subsequent to Acquisition	16,286,000
Land and improvements	27,135,000
Buildings and Improvements	97,444,000
Land Held for Development	0
Development and Construction in Progress	0
Total	124,579,000
Accumulated Depreciation	29,518,000
Year(s) built / renovated	1984
Depreciable Lives (Years)	-1	[2]
601 Massachusetts Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	601 Massachusetts Avenue
Type	Development
Location	Washington, DC
Costs Capitalized Subsequent to Acquisition	121,694,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	0
Development and Construction in Progress	121,694,000
Total	121,694,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
535 Mission [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	535 Mission Street
Type	Development
Location	San Francisco, CA
Costs Capitalized Subsequent to Acquisition	113,274,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	0
Development and Construction in Progress	113,274,000
Total	113,274,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Weston Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Weston Corporate Center
Type	Office
Location	Weston, MA
Original Land	25,753,000
Original Building	92,312,000
Costs Capitalized Subsequent to Acquisition	(123,000)
Land and improvements	25,854,000
Buildings and Improvements	92,088,000
Land Held for Development	0
Development and Construction in Progress	0
Total	117,942,000
Accumulated Depreciation	10,921,000
Year(s) built / renovated	2010
Depreciable Lives (Years)	-1	[2]
One Freedom Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	One Freedom Square
Type	Office
Location	Reston, VA
Encumbrances	0
Original Land	9,929,000
Original Building	84,504,000
Costs Capitalized Subsequent to Acquisition	16,666,000
Land and improvements	11,293,000
Buildings and Improvements	99,806,000
Land Held for Development	0
Development and Construction in Progress	0
Total	111,099,000
Accumulated Depreciation	32,827,000
Year(s) built / renovated	2000
Depreciable Lives (Years)	-1	[2]
One And Two Reston Overlook [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	One and Two Reston Overlook
Type	Office
Location	Reston, VA
Encumbrances	0
Original Land	16,456,000
Original Building	66,192,000
Costs Capitalized Subsequent to Acquisition	26,635,000
Land and improvements	17,561,000
Buildings and Improvements	91,722,000
Land Held for Development	0
Development and Construction in Progress	0
Total	109,283,000
Accumulated Depreciation	31,144,000
Year(s) built / renovated	1999
Depreciable Lives (Years)	-1	[2]
Two Freedom Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Two Freedom Square
Type	Office
Location	Reston, VA
Encumbrances	0
Original Land	13,930,000
Original Building	77,739,000
Costs Capitalized Subsequent to Acquisition	13,816,000
Land and improvements	15,420,000
Buildings and Improvements	90,065,000
Land Held for Development	0
Development and Construction in Progress	0
Total	105,485,000
Accumulated Depreciation	37,294,000
Year(s) built / renovated	2001
Depreciable Lives (Years)	-1	[2]
Seven Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Seven Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	3,457,000
Original Building	97,136,000
Costs Capitalized Subsequent to Acquisition	2,880,000
Land and improvements	4,125,000
Buildings and Improvements	99,348,000
Land Held for Development	0
Development and Construction in Progress	0
Total	103,473,000
Accumulated Depreciation	47,498,000
Year(s) built / renovated	2006
Depreciable Lives (Years)	-1	[2]
Discovery Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Discovery Square
Type	Office
Location	Reston, VA
Encumbrances	0
Original Land	11,198,000
Original Building	71,782,000
Costs Capitalized Subsequent to Acquisition	16,189,000
Land and improvements	12,533,000
Buildings and Improvements	86,636,000
Land Held for Development	0
Development and Construction in Progress	0
Total	99,169,000
Accumulated Depreciation	28,865,000
Year(s) built / renovated	2001
Depreciable Lives (Years)	-1	[2]
140 Kendrick Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	140 Kendrick Street
Type	Office
Location	Needham, MA
Encumbrances	0
Original Land	18,095,000
Original Building	66,905,000
Costs Capitalized Subsequent to Acquisition	14,759,000
Land and improvements	19,092,000
Buildings and Improvements	80,667,000
Land Held for Development	0
Development and Construction in Progress	0
Total	99,759,000
Accumulated Depreciation	17,433,000
Year(s) built / renovated	2000
Depreciable Lives (Years)	-1	[2]
Five Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Five Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	18,863,000
Original Building	53,346,000
Costs Capitalized Subsequent to Acquisition	29,762,000
Land and improvements	21,173,000
Buildings and Improvements	80,798,000
Land Held for Development	0
Development and Construction in Progress	0
Total	101,971,000
Accumulated Depreciation	19,158,000
Year(s) built / renovated	1981/1996
Depreciable Lives (Years)	-1	[2]
77 CityPoint [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	77 CityPoint
Type	Office
Location	Waltham, MA
Encumbrances	0
Original Land	13,847,000
Original Building	60,383,000
Costs Capitalized Subsequent to Acquisition	3,160,000
Land and improvements	13,873,000
Buildings and Improvements	63,517,000
Land Held for Development	0
Development and Construction in Progress	0
Total	77,390,000
Accumulated Depreciation	12,301,000
Year(s) built / renovated	2008
Depreciable Lives (Years)	-1	[2]
North First Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	North First Business Park
Type	Office
Location	San Jose, CA
Encumbrances	0
Original Land	58,402,000
Original Building	13,069,000
Costs Capitalized Subsequent to Acquisition	4,010,000
Land and improvements	23,377,000
Buildings and Improvements	16,215,000
Land Held for Development	35,889,000
Development and Construction in Progress	0
Total	75,481,000
Accumulated Depreciation	10,208,000
Year(s) built / renovated	1981
Depreciable Lives (Years)	-1	[2]
230 CityPoint [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	230 CityPoint
Type	Office
Location	Waltham, MA
Encumbrances	0
Original Land	13,189,000
Original Building	49,823,000
Costs Capitalized Subsequent to Acquisition	13,102,000
Land and improvements	13,593,000
Buildings and Improvements	62,521,000
Land Held for Development	0
Development and Construction in Progress	0
Total	76,114,000
Accumulated Depreciation	17,601,000
Year(s) built / renovated	1992
Depreciable Lives (Years)	-1	[2]
Four Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Four Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	19,104,000
Original Building	52,078,000
Costs Capitalized Subsequent to Acquisition	11,872,000
Land and improvements	20,785,000
Buildings and Improvements	62,269,000
Land Held for Development	0
Development and Construction in Progress	0
Total	83,054,000
Accumulated Depreciation	10,761,000
Year(s) built / renovated	1983/1998
Depreciable Lives (Years)	-1	[2]
Waltham Weston Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Waltham Weston Corporate Center
Type	Office
Location	Waltham, MA
Encumbrances	0
Original Land	10,385,000
Original Building	60,694,000
Costs Capitalized Subsequent to Acquisition	8,462,000
Land and improvements	11,097,000
Buildings and Improvements	68,444,000
Land Held for Development	0
Development and Construction in Progress	0
Total	79,541,000
Accumulated Depreciation	21,709,000
Year(s) built / renovated	2003
Depreciable Lives (Years)	-1	[2]
2440 West El Camino Real [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	2440 West El Camino Real
Type	Office
Location	Mountain View, CA
Encumbrances	0
Original Land	16,741,000
Original Building	51,285,000
Costs Capitalized Subsequent to Acquisition	502,000
Land and improvements	16,741,000
Buildings and Improvements	51,787,000
Land Held for Development	0
Development and Construction in Progress	0
Total	68,528,000
Accumulated Depreciation	4,390,000
Year(s) built / renovated	1987/2003
Depreciable Lives (Years)	-1	[2]
Wisconsin Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Wisconsin Place
Type	Office
Location	Chevy Chase, MD
Encumbrances	0
Original Land	0
Original Building	53,349,000
Costs Capitalized Subsequent to Acquisition	12,787,000
Land and improvements	0
Buildings and Improvements	66,136,000
Land Held for Development	0
Development and Construction in Progress	0
Total	66,136,000
Accumulated Depreciation	11,573,000
Year(s) built / renovated	2009
Depreciable Lives (Years)	-1	[2]
Reston Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Reston Corporate Center
Type	Office
Location	Reston, VA
Encumbrances	0
Original Land	9,135,000
Original Building	50,857,000
Costs Capitalized Subsequent to Acquisition	5,346,000
Land and improvements	10,148,000
Buildings and Improvements	55,190,000
Land Held for Development	0
Development and Construction in Progress	0
Total	65,338,000
Accumulated Depreciation	21,034,000
Year(s) built / renovated	1984
Depreciable Lives (Years)	-1	[2]
New Dominion Technology Park, Bldg. Two [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	New Dominion Technology Park, Bldg. Two
Type	Office
Location	Herndon, VA
Encumbrances	63,000,000
Original Land	5,584,000
Original Building	51,868,000
Costs Capitalized Subsequent to Acquisition	3,894,000
Land and improvements	6,510,000
Buildings and Improvements	54,836,000
Land Held for Development	0
Development and Construction in Progress	0
Total	61,346,000
Accumulated Depreciation	16,557,000
Year(s) built / renovated	2004
Depreciable Lives (Years)	-1	[2]
Sumner Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Sumner Square
Type	Office
Location	Washington, DC
Encumbrances	0
Original Land	624,000
Original Building	28,745,000
Costs Capitalized Subsequent to Acquisition	23,679,000
Land and improvements	1,478,000
Buildings and Improvements	51,570,000
Land Held for Development	0
Development and Construction in Progress	0
Total	53,048,000
Accumulated Depreciation	23,282,000
Year(s) built / renovated	1985
Depreciable Lives (Years)	-1	[2]
New Dominion Technology Park, Bldg. One [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	New Dominion Technology Park, Bldg. One
Type	Office
Location	Herndon, VA
Encumbrances	43,278,000
Original Land	3,880,000
Original Building	43,227,000
Costs Capitalized Subsequent to Acquisition	3,882,000
Land and improvements	4,583,000
Buildings and Improvements	46,406,000
Land Held for Development	0
Development and Construction in Progress	0
Total	50,989,000
Accumulated Depreciation	19,584,000
Year(s) built / renovated	2001
Depreciable Lives (Years)	-1	[2]
200 West Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	200 West Street
Type	Office
Location	Waltham, MA
Encumbrances	0
Original Land	16,148,000
Original Building	24,983,000
Costs Capitalized Subsequent to Acquisition	8,568,000
Land and improvements	16,813,000
Buildings and Improvements	32,886,000
Land Held for Development	0
Development and Construction in Progress	0
Total	49,699,000
Accumulated Depreciation	14,834,000
Year(s) built / renovated	1999
Depreciable Lives (Years)	-1	[2]
191 Spring Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	191 Spring Street
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	2,850,000
Original Building	27,166,000
Costs Capitalized Subsequent to Acquisition	18,558,000
Land and improvements	3,151,000
Buildings and Improvements	45,423,000
Land Held for Development	0
Development and Construction in Progress	0
Total	48,574,000
Accumulated Depreciation	29,636,000
Year(s) built / renovated	1971/1995
Depreciable Lives (Years)	-1	[2]
University Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	University Place
Type	Office
Location	Cambridge, MA
Encumbrances	13,692,000
Original Land	0
Original Building	37,091,000
Costs Capitalized Subsequent to Acquisition	6,785,000
Land and improvements	390,000
Buildings and Improvements	43,486,000
Land Held for Development	0
Development and Construction in Progress	0
Total	43,876,000
Accumulated Depreciation	20,692,000
Year(s) built / renovated	1985
Depreciable Lives (Years)	-1	[2]
2600 Tower Oaks Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	2600 Tower Oaks Boulevard
Type	Office
Location	Rockville, MD
Encumbrances	0
Original Land	4,243,000
Original Building	31,125,000
Costs Capitalized Subsequent to Acquisition	8,257,000
Land and improvements	4,785,000
Buildings and Improvements	38,840,000
Land Held for Development	0
Development and Construction in Progress	0
Total	43,625,000
Accumulated Depreciation	16,576,000
Year(s) built / renovated	2001
Depreciable Lives (Years)	-1	[2]
Quorum Office Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Quorum Office Park
Type	Office
Location	Chelmsford, MA
Encumbrances	0
Original Land	3,750,000
Original Building	32,454,000
Costs Capitalized Subsequent to Acquisition	5,672,000
Land and improvements	5,187,000
Buildings and Improvements	36,689,000
Land Held for Development	0
Development and Construction in Progress	0
Total	41,876,000
Accumulated Depreciation	12,748,000
Year(s) built / renovated	2001
Depreciable Lives (Years)	-1	[2]
One Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	One Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	134,000
Original Building	25,110,000
Costs Capitalized Subsequent to Acquisition	20,608,000
Land and improvements	548,000
Buildings and Improvements	45,304,000
Land Held for Development	0
Development and Construction in Progress	0
Total	45,852,000
Accumulated Depreciation	24,914,000
Year(s) built / renovated	1987
Depreciable Lives (Years)	-1	[2]
Three Patriots Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Three Patriots Park
Type	Office
Location	Reston, VA
Encumbrances	0
Original Land	3,594,000
Original Building	32,977,000
Costs Capitalized Subsequent to Acquisition	3,013,000
Land and improvements	4,009,000
Buildings and Improvements	35,575,000
Land Held for Development	0
Development and Construction in Progress	0
Total	39,584,000
Accumulated Depreciation	12,465,000
Year(s) built / renovated	2006
Depreciable Lives (Years)	-1	[2]
500 E Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	500 E Street
Type	Office
Location	Washington, DC
Encumbrances	0
Original Land	109,000
Original Building	22,420,000
Costs Capitalized Subsequent to Acquisition	12,854,000
Land and improvements	2,379,000
Buildings and Improvements	33,004,000
Land Held for Development	0
Development and Construction in Progress	0
Total	35,383,000
Accumulated Depreciation	20,633,000
Year(s) built / renovated	1987
Depreciable Lives (Years)	-1	[2]
Eight Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Eight Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	850,000
Original Building	25,042,000
Costs Capitalized Subsequent to Acquisition	8,507,000
Land and improvements	1,323,000
Buildings and Improvements	33,076,000
Land Held for Development	0
Development and Construction in Progress	0
Total	34,399,000
Accumulated Depreciation	11,139,000
Year(s) built / renovated	1999
Depreciable Lives (Years)	-1	[2]
Mountain View Technology [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Mountain View Technology Park
Type	Office
Location	Mountain View, CA
Encumbrances	0
Original Land	20,359,000
Original Building	13,640,000
Costs Capitalized Subsequent to Acquisition	182,000
Land and improvements	20,359,000
Buildings and Improvements	13,822,000
Land Held for Development	0
Development and Construction in Progress	0
Total	34,181,000
Accumulated Depreciation	761,000
Year(s) built / renovated	1972
Depreciable Lives (Years)	-1	[2]
Ten Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Ten Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	1,299,000
Original Building	12,943,000
Costs Capitalized Subsequent to Acquisition	6,117,000
Land and improvements	2,395,000
Buildings and Improvements	17,964,000
Land Held for Development	0
Development and Construction in Progress	0
Total	20,359,000
Accumulated Depreciation	11,337,000
Year(s) built / renovated	1990
Depreciable Lives (Years)	-1	[2]
Three Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Three Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	174,000
Original Building	12,200,000
Costs Capitalized Subsequent to Acquisition	8,758,000
Land and improvements	965,000
Buildings and Improvements	20,167,000
Land Held for Development	0
Development and Construction in Progress	0
Total	21,132,000
Accumulated Depreciation	9,768,000
Year(s) built / renovated	1987
Depreciable Lives (Years)	-1	[2]
201 Spring Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	201 Spring Street
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	2,849,000
Original Building	15,303,000
Costs Capitalized Subsequent to Acquisition	(154,000)
Land and improvements	3,124,000
Buildings and Improvements	14,874,000
Land Held for Development	0
Development and Construction in Progress	0
Total	17,998,000
Accumulated Depreciation	6,034,000
Year(s) built / renovated	1997
Depreciable Lives (Years)	-1	[2]
40 Shattuck Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	40 Shattuck Road
Type	Office
Location	Andover, MA
Encumbrances	0
Original Land	709,000
Original Building	14,740,000
Costs Capitalized Subsequent to Acquisition	2,453,000
Land and improvements	893,000
Buildings and Improvements	17,009,000
Land Held for Development	0
Development and Construction in Progress	0
Total	17,902,000
Accumulated Depreciation	5,547,000
Year(s) built / renovated	2001
Depreciable Lives (Years)	-1	[2]
Lexington Office Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Lexington Office Park
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	998,000
Original Building	1,426,000
Costs Capitalized Subsequent to Acquisition	13,762,000
Land and improvements	1,264,000
Buildings and Improvements	14,922,000
Land Held for Development	0
Development and Construction in Progress	0
Total	16,186,000
Accumulated Depreciation	10,566,000
Year(s) built / renovated	1982
Depreciable Lives (Years)	-1	[2]
92 - 100 Hayden Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	92-100 Hayden Avenue
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	594,000
Original Building	6,748,000
Costs Capitalized Subsequent to Acquisition	7,819,000
Land and improvements	802,000
Buildings and Improvements	14,359,000
Land Held for Development	0
Development and Construction in Progress	0
Total	15,161,000
Accumulated Depreciation	9,914,000
Year(s) built / renovated	1985
Depreciable Lives (Years)	-1	[2]
6601 and 6605 Springfield Center Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	6601 & 6605 Springfield Center Drive
Type	Land
Location	Springfield, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	13,866,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	13,866,000
Development and Construction in Progress	0
Total	13,866,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
181 Spring Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	181 Spring Street
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	1,066,000
Original Building	9,520,000
Costs Capitalized Subsequent to Acquisition	1,950,000
Land and improvements	1,160,000
Buildings and Improvements	11,376,000
Land Held for Development	0
Development and Construction in Progress	0
Total	12,536,000
Accumulated Depreciation	4,007,000
Year(s) built / renovated	1999
Depreciable Lives (Years)	-1	[2]
195 West Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	195 West Street
Type	Office
Location	Waltham, MA
Encumbrances	0
Original Land	1,611,000
Original Building	6,652,000
Costs Capitalized Subsequent to Acquisition	4,175,000
Land and improvements	1,858,000
Buildings and Improvements	10,580,000
Land Held for Development	0
Development and Construction in Progress	0
Total	12,438,000
Accumulated Depreciation	6,187,000
Year(s) built / renovated	1990
Depreciable Lives (Years)	-1	[2]
91 Hartwell Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	91 Hartwell Avenue
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	784,000
Original Building	6,464,000
Costs Capitalized Subsequent to Acquisition	4,984,000
Land and improvements	941,000
Buildings and Improvements	11,291,000
Land Held for Development	0
Development and Construction in Progress	0
Total	12,232,000
Accumulated Depreciation	7,535,000
Year(s) built / renovated	1985
Depreciable Lives (Years)	-1	[2]
Waltham Office Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Waltham Office Center
Type	Land
Location	Waltham, MA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	12,716,000
Land and improvements	165,000
Buildings and Improvements	8,445,000
Land Held for Development	4,106,000
Development and Construction in Progress	0
Total	12,716,000
Accumulated Depreciation	8,063,000
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Eleven Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Eleven Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	121,000
Original Building	5,535,000
Costs Capitalized Subsequent to Acquisition	5,131,000
Land and improvements	324,000
Buildings and Improvements	10,463,000
Land Held for Development	0
Development and Construction in Progress	0
Total	10,787,000
Accumulated Depreciation	7,240,000
Year(s) built / renovated	1984
Depreciable Lives (Years)	-1	[2]
7501 Boston Boulevard, Building Seven [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7501 Boston Boulevard, Building Seven
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	665,000
Original Building	9,273,000
Costs Capitalized Subsequent to Acquisition	544,000
Land and improvements	791,000
Buildings and Improvements	9,691,000
Land Held for Development	0
Development and Construction in Progress	0
Total	10,482,000
Accumulated Depreciation	3,895,000
Year(s) built / renovated	1997
Depreciable Lives (Years)	-1	[2]
33 Hayden Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	33 Hayden Avenue
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	266,000
Original Building	3,234,000
Costs Capitalized Subsequent to Acquisition	10,283,000
Land and improvements	425,000
Buildings and Improvements	13,358,000
Land Held for Development	0
Development and Construction in Progress	0
Total	13,783,000
Accumulated Depreciation	7,486,000
Year(s) built / renovated	1979
Depreciable Lives (Years)	-1	[2]
7435 Boston Boulevard, Building One [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7435 Boston Boulevard, Building One
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	392,000
Original Building	3,822,000
Costs Capitalized Subsequent to Acquisition	3,895,000
Land and improvements	659,000
Buildings and Improvements	7,450,000
Land Held for Development	0
Development and Construction in Progress	0
Total	8,109,000
Accumulated Depreciation	5,526,000
Year(s) built / renovated	1982
Depreciable Lives (Years)	-1	[2]
7450 Boston Boulevard, Building Three [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7450 Boston Boulevard, Building Three
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	1,165,000
Original Building	4,681,000
Costs Capitalized Subsequent to Acquisition	1,915,000
Land and improvements	1,430,000
Buildings and Improvements	6,331,000
Land Held for Development	0
Development and Construction in Progress	0
Total	7,761,000
Accumulated Depreciation	2,917,000
Year(s) built / renovated	1987
Depreciable Lives (Years)	-1	[2]
8000 Grainger Court, Building Five [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	8000 Grainger Court, Building Five
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	366,000
Original Building	4,282,000
Costs Capitalized Subsequent to Acquisition	2,944,000
Land and improvements	601,000
Buildings and Improvements	6,991,000
Land Held for Development	0
Development and Construction in Progress	0
Total	7,592,000
Accumulated Depreciation	5,160,000
Year(s) built / renovated	1984
Depreciable Lives (Years)	-1	[2]
453 Ravendale Drive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	453 Ravendale Drive
Type	Office
Location	Mountain View, CA
Encumbrances	0
Original Land	5,477,000
Original Building	1,090,000
Costs Capitalized Subsequent to Acquisition	230,000
Land and improvements	5,477,000
Buildings and Improvements	1,320,000
Land Held for Development	0
Development and Construction in Progress	0
Total	6,797,000
Accumulated Depreciation	142,000
Year(s) built / renovated	1977
Depreciable Lives (Years)	-1	[2]
7500 Boston Boulevard, Building Six [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7500 Boston Boulevard, Building Six
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	138,000
Original Building	3,749,000
Costs Capitalized Subsequent to Acquisition	2,590,000
Land and improvements	406,000
Buildings and Improvements	6,071,000
Land Held for Development	0
Development and Construction in Progress	0
Total	6,477,000
Accumulated Depreciation	4,133,000
Year(s) built / renovated	1985
Depreciable Lives (Years)	-1	[2]
7601 Boston Boulevard, Building Eight [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7601 Boston Boulevard, Building Eight
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	200,000
Original Building	878,000
Costs Capitalized Subsequent to Acquisition	4,875,000
Land and improvements	551,000
Buildings and Improvements	5,402,000
Land Held for Development	0
Development and Construction in Progress	0
Total	5,953,000
Accumulated Depreciation	3,576,000
Year(s) built / renovated	1986
Depreciable Lives (Years)	-1	[2]
Fourteen Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Fourteen Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	110,000
Original Building	4,483,000
Costs Capitalized Subsequent to Acquisition	1,223,000
Land and improvements	273,000
Buildings and Improvements	5,543,000
Land Held for Development	0
Development and Construction in Progress	0
Total	5,816,000
Accumulated Depreciation	3,805,000
Year(s) built / renovated	1983
Depreciable Lives (Years)	-1	[2]
7300 Boston Boulevard, Building Thirteen [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7300 Boston Boulevard, Building Thirteen
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	608,000
Original Building	4,773,000
Costs Capitalized Subsequent to Acquisition	230,000
Land and improvements	661,000
Buildings and Improvements	4,950,000
Land Held for Development	0
Development and Construction in Progress	0
Total	5,611,000
Accumulated Depreciation	3,934,000
Year(s) built / renovated	2002
Depreciable Lives (Years)	-1	[2]
8000 Corporate Court, Building Eleven [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	8000 Corporate Court, Building Eleven
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	136,000
Original Building	3,071,000
Costs Capitalized Subsequent to Acquisition	1,484,000
Land and improvements	775,000
Buildings and Improvements	3,916,000
Land Held for Development	0
Development and Construction in Progress	0
Total	4,691,000
Accumulated Depreciation	2,355,000
Year(s) built / renovated	1989
Depreciable Lives (Years)	-1	[2]
7374 Boston Boulevard, Building Four [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7374 Boston Boulevard, Building Four
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	241,000
Original Building	1,605,000
Costs Capitalized Subsequent to Acquisition	1,902,000
Land and improvements	398,000
Buildings and Improvements	3,350,000
Land Held for Development	0
Development and Construction in Progress	0
Total	3,748,000
Accumulated Depreciation	2,327,000
Year(s) built / renovated	1984
Depreciable Lives (Years)	-1	[2]
7375 Boston Boulevard, Building Ten [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7375 Boston Boulevard, Building Ten
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	23,000
Original Building	2,685,000
Costs Capitalized Subsequent to Acquisition	1,007,000
Land and improvements	93,000
Buildings and Improvements	3,622,000
Land Held for Development	0
Development and Construction in Progress	0
Total	3,715,000
Accumulated Depreciation	2,261,000
Year(s) built / renovated	1988
Depreciable Lives (Years)	-1	[2]
7451 Boston Boulevard, Building Two [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	7451 Boston Boulevard, Building Two
Type	Office
Location	Springfield, VA
Encumbrances	0
Original Land	249,000
Original Building	1,542,000
Costs Capitalized Subsequent to Acquisition	1,313,000
Land and improvements	613,000
Buildings and Improvements	2,491,000
Land Held for Development	0
Development and Construction in Progress	0
Total	3,104,000
Accumulated Depreciation	2,131,000
Year(s) built / renovated	1982
Depreciable Lives (Years)	-1	[2]
32 Hartwell Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	32 Hartwell Avenue
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	168,000
Original Building	1,943,000
Costs Capitalized Subsequent to Acquisition	800,000
Land and improvements	314,000
Buildings and Improvements	2,597,000
Land Held for Development	0
Development and Construction in Progress	0
Total	2,911,000
Accumulated Depreciation	1,568,000
Year(s) built / renovated	1968-1979/1987
Depreciable Lives (Years)	-1	[2]
164 Lexington Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	164 Lexington Road
Type	Office
Location	Billerica, MA
Encumbrances	0
Original Land	592,000
Original Building	1,370,000
Costs Capitalized Subsequent to Acquisition	319,000
Land and improvements	643,000
Buildings and Improvements	1,638,000
Land Held for Development	0
Development and Construction in Progress	0
Total	2,281,000
Accumulated Depreciation	703,000
Year(s) built / renovated	1982
Depreciable Lives (Years)	-1	[2]
Seventeen Hartwell Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	17 Hartwell Avenue
Type	Office
Location	Lexington, MA
Encumbrances	0
Original Land	26,000
Original Building	150,000
Costs Capitalized Subsequent to Acquisition	1,002,000
Land and improvements	65,000
Buildings and Improvements	1,113,000
Land Held for Development	0
Development and Construction in Progress	0
Total	1,178,000
Accumulated Depreciation	639,000
Year(s) built / renovated	1968
Depreciable Lives (Years)	-1	[2]
Residences on The Avenue, Two Two Two One I St., NW [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Residences on The Avenue, 2221 I St., NW
Type	Residential
Location	Washington, DC
Encumbrances	0
Original Land	0
Original Building	119,874,000
Costs Capitalized Subsequent to Acquisition	(32,000)
Land and improvements	0
Buildings and Improvements	119,842,000
Land Held for Development	0
Development and Construction in Progress	0
Total	119,842,000
Accumulated Depreciation	7,948,000
Year(s) built / renovated	2011
Depreciable Lives (Years)	-1	[2]
The Lofts At Atlantic Wharf [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	The Lofts at Atlantic Wharf
Type	Residential
Location	Boston, MA
Encumbrances	0
Original Land	3,529,000
Original Building	54,891,000
Costs Capitalized Subsequent to Acquisition	1,543,000
Land and improvements	3,529,000
Buildings and Improvements	56,434,000
Land Held for Development	0
Development and Construction in Progress	0
Total	59,963,000
Accumulated Depreciation	3,591,000
Year(s) built / renovated	2011
Depreciable Lives (Years)	-1	[2]
Cambridge Center Marriott [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Cambridge Center Marriott
Type	Hotel
Location	Cambridge, MA
Encumbrances	0
Original Land	478,000
Original Building	37,918,000
Costs Capitalized Subsequent to Acquisition	35,981,000
Land and improvements	1,201,000
Buildings and Improvements	73,176,000
Land Held for Development	0
Development and Construction in Progress	0
Total	74,377,000
Accumulated Depreciation	47,182,000
Year(s) built / renovated	1986
Depreciable Lives (Years)	-1	[2]
Cambridge Center East Garage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Cambridge Center East Garage
Type	Garage
Location	Cambridge, MA
Encumbrances	0
Original Land	0
Original Building	35,035,000
Costs Capitalized Subsequent to Acquisition	1,487,000
Land and improvements	103,000
Buildings and Improvements	36,419,000
Land Held for Development	0
Development and Construction in Progress	0
Total	36,522,000
Accumulated Depreciation	6,684,000
Year(s) built / renovated	1984
Depreciable Lives (Years)	-1	[2]
Cambridge Center West Garage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Cambridge Center West Garage
Type	Garage
Location	Cambridge, MA
Encumbrances	0
Original Land	1,256,000
Original Building	15,697,000
Costs Capitalized Subsequent to Acquisition	1,553,000
Land and improvements	1,434,000
Buildings and Improvements	17,072,000
Land Held for Development	0
Development and Construction in Progress	0
Total	18,506,000
Accumulated Depreciation	3,364,000
Year(s) built / renovated	2006
Depreciable Lives (Years)	-1	[2]
Cambridge Center North Garage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Cambridge Center North Garage
Type	Garage
Location	Cambridge, MA
Encumbrances	0
Original Land	1,163,000
Original Building	11,633,000
Costs Capitalized Subsequent to Acquisition	1,085,000
Land and improvements	1,163,000
Buildings and Improvements	12,718,000
Land Held for Development	0
Development and Construction in Progress	0
Total	13,881,000
Accumulated Depreciation	8,157,000
Year(s) built / renovated	1990
Depreciable Lives (Years)	-1	[2]
250 West 55th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	250 West 55th Street
Type	Development
Location	New York, NY
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	818,243,000
Land and improvements	16,305,000
Buildings and Improvements	45,476,000
Land Held for Development	0
Development and Construction in Progress	756,462,000
Total	818,243,000
Accumulated Depreciation	483,000
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Transbay Tower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Transbay Tower
Type	Development
Location	San Francisco, CA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	255,406,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	0
Development and Construction in Progress	255,406,000
Total	255,406,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
680 Folsom Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	680 Folsom Street
Type	Development
Location	San Francisco, CA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	241,093,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	3,475,000
Development and Construction in Progress	237,618,000
Total	241,093,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
The Avant at Reston Town Center Residential [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	The Avant at Reston Town Center Residential
Type	Development
Location	Reston, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	107,022,000
Land and improvements	12,741,000
Buildings and Improvements	55,701,000
Land Held for Development	0
Development and Construction in Progress	38,580,000
Total	107,022,000
Accumulated Depreciation	160,000
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Seventeen Cambridge Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Seventeen Cambridge Center
Type	Office
Location	Cambridge, MA
Encumbrances	0
Original Land	18,080,000
Original Building	51,262,000
Costs Capitalized Subsequent to Acquisition	0
Land and improvements	18,080,000
Buildings and Improvements	51,262,000
Land Held for Development	0
Development and Construction in Progress	0
Total	69,342,000
Accumulated Depreciation	1,080,000
Year(s) built / renovated	2013
Depreciable Lives (Years)	(1)	[2]
Plaza at Almaden [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Plaza at Almaden
Type	Land
Location	San Jose, CA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	29,003,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	29,003,000
Development and Construction in Progress	0
Total	29,003,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Springfield Metro Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Springfield Metro Center
Type	Land
Location	Springfield, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	32,073,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	32,073,000
Development and Construction in Progress	0
Total	32,073,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Tower Oaks Master Plan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Tower Oaks Master Plan
Type	Land
Location	Rockville, MD
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	28,976,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	28,976,000
Development and Construction in Progress	0
Total	28,976,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Reston Signature Site [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Reston Signature Site
Type	Land
Location	Reston, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	27,890,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	27,890,000
Development and Construction in Progress	0
Total	27,890,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Prospect Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Prospect Hill
Type	Land
Location	Waltham, MA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	24,197,000
Land and improvements	0
Buildings and Improvements	667,000
Land Held for Development	23,530,000
Development and Construction in Progress	0
Total	24,197,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Washingtonian North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Washingtonian North
Type	Land
Location	Gaithersburg, MD
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	18,290,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	18,290,000
Development and Construction in Progress	0
Total	18,290,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
103 4th Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	103 4th Avenue
Type	Land
Location	Waltham, MA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	11,918,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	11,918,000
Development and Construction in Progress	0
Total	11,918,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Cambridge Master Plan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Cambridge Master Plan
Type	Land
Location	Cambridge, MA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	11,153,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	11,153,000
Development and Construction in Progress	0
Total	11,153,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Reston Gateway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Reston Gateway
Type	Land
Location	Reston, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	9,682,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	9,682,000
Development and Construction in Progress	0
Total	9,682,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Reston Eastgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Reston Eastgate
Type	Land
Location	Reston, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	8,807,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	8,807,000
Development and Construction in Progress	0
Total	8,807,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Crane Meadow [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Crane Meadow
Type	Land
Location	Marlborough, MA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	8,725,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	8,725,000
Development and Construction in Progress	0
Total	8,725,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Broad Run Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	Broad Run Business Park
Type	Land
Location	Loudon County, VA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	7,888,000
Land and improvements	1,621,000
Buildings and Improvements	0
Land Held for Development	6,267,000
Development and Construction in Progress	0
Total	7,888,000
Accumulated Depreciation	0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
30 Shattuck Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Name of Property	30 Shattuck Road
Type	Land
Location	Andover, MA
Encumbrances	0
Original Land	0
Original Building	0
Costs Capitalized Subsequent to Acquisition	1,212,000
Land and improvements	0
Buildings and Improvements	0
Land Held for Development	1,212,000
Development and Construction in Progress	0
Total	1,212,000
Accumulated Depreciation	$ 0
Year(s) built / renovated	N/A
Depreciable Lives (Years)	N/A
Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life Used for Depreciation	life of the lease

[1] (2)Includes the unamortized balance of the historical fair value adjustment totaling approximately $191.2 million.

[2] (1)Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

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Mortgage Notes Payable Schedule of Aggregate Principal Payments On Mortgage Notes (Tables)

12 Months Ended

Dec. 31, 2013

Mortgage Notes Payable [Abstract]

Schedule of Aggregate Principal Payments On Mortgage Notes [Table Text Block]

Contractual aggregate principal payments of mortgage notes payable at December 31, 2013 are as follows: 

	Principal Payments
	(in thousands)
2014	$	87,759
2015	26,182
2016	608,879
2017	2,821,750
2018	18,633
Thereafter	695,327
Total aggregate principal payments	4,258,530
Unamortized balance of historical fair value adjustments	191,204
Total carrying value of mortgage notes payable	$	4,449,734

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Real Estate (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended					0 Months Ended						3 Months Ended		0 Months Ended	9 Months Ended			0 Months Ended	7 Months Ended	0 Months Ended	3 Months Ended		0 Months Ended		0 Months Ended				0 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 06, 2013 535 Mission [Member] floor sqft	Mar. 26, 2013 Transbay Tower [Member] floor sqft	Feb. 26, 2013 Transbay Tower [Member]	Feb. 07, 2013 Transbay Tower [Member]	Mar. 22, 2013 Two Patriots Park [Member] sqft	Mar. 29, 2013 Reston Signature Site [Member] sqft	Apr. 25, 2013 601 Massachusetts Avenue [Member] sqft	Jun. 14, 2013 Seventeen Cambridge Center [Member] sqft	Dec. 31, 2013 The Avant at Reston Town Center Residential [Member] apartments sqft	Dec. 31, 2013 250 West 55th Street [Member] sqft	Dec. 31, 2013 680 Folsom Street [Member] sqft	Mar. 31, 2013 Plaza at Almaden [Member]	Jun. 28, 2013 Plaza at Almaden [Member] sqft	Apr. 10, 2013 Mountain View Research And Technology Parks [Member]	Dec. 31, 2013 Mountain View Research And Technology Parks [Member]	Apr. 10, 2013 Mountain View Research [Member] Buildings sqft	Apr. 10, 2013 Mountain View Technology [Member] sqft Buildings	May 31, 2013 767 5th Avenue (The General Motors Building) [Member] sqft	Dec. 31, 2013 767 5th Avenue (The General Motors Building) [Member]	Feb. 20, 2013 Montvale Center [Member]	Mar. 31, 2013 303 Almaden [Member]	Jun. 28, 2013 303 Almaden [Member] sqft	Aug. 22, 2013 1301 New York Avenue [Member] sqft	Oct. 09, 2013 Time Square Tower [Member] sqft	Dec. 20, 2013 10 and 20 Burlington Mall Road [Member] Buildings sqft	Dec. 20, 2013 One Preserve Parkway [Member] sqft	Oct. 29, 2013 Princeton Build to Suit [Member] sqft	Dec. 31, 2013 Cambridge Center Connector [Member] sqft	May 31, 2013 767 5th Avenue (The General Motors Building) [Member] partners
Real Estate Properties [Line Items]
Gain on consolidation of joint ventures									$ 385,991,000	$ 0	$ 0														$ 26,500,000				$ 359,500,000											$ 359,500,000
Payments to Acquire and Develop Real Estate									522,900,000	788,052,000	112,180,000	71,000,000
Partners Joint Venture Ownership Percentage														5.00%	50.00%														40.00%
Number of floors in building												27	60
Revenues contributed by acquisitions	576,199,000	571,481,000	510,033,000	477,826,000	478,047,000	464,220,000	466,197,000	438,722,000	2,135,539,000	1,847,186,000	1,722,792,000															16,700,000				168,400,000
Earnings									678,120,000	640,321,000	605,166,000															400,000				8,400,000
Amount of debt extinguished																															25,000,000
Gain on forgiveness of debt from discontinued operations									20,182,000	0	0																				20,200,000
Proceeds from the sale of real estate									250,078,000	61,963,000	0																							121,500,000		29,400,000	59,900,000
Gain on sale of real estate from discontinued operations									112,829,000	36,877,000	0																							86,400,000		20,500,000	5,900,000
Number of real estate properties																											16	7								2
Net Rentable Area												307,000	1,400,000			256,000	250,000	478,000	195,000	355,000	989,000	525,000		840,000			604,000	135,000	1,800,000				158,000	201,000	1,246,000	152,000	184,000	130,000	43,000
Property placed in-service (percentage)																				63.00%	6.00%	1.00%
Portion allocation to noncontrolling interest based on carrying value of the total equity of the property prior to the sale																																			243,500,000
ownership interest sold (percent)																																			45.00%
Contractual Sales Price																																	40,000,000	135,000,000		30,000,000	61,300,000
Number of apartment units																				359
Impairment loss from discontinued operations									3,241,000	0	0																					3,200,000
Number of Joint Venture Partners																																								2
Aggregate purchase price																									233,084,000
Payments to Acquire Land													192,000,000				27,000,000
Ownership Percentage													95.00%	95.00%
Impairment loss									8,306,000	0	0												8,300,000
Net Contractual Sales Price																																		121,700,000	684,000,000
Proceeds from sale of an interest in a real estate asset																																			673,100,000
Difference between net cash proceeds received and noncontrolling interest recognized																																			$ 429,600,000

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Segment Information

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by both geographic area and property type. The Company’s segments by geographic area are Boston, New York, Princeton, San Francisco and Washington, DC. Segments by property type include: Class A Office, Office/Technical, Residential and Hotel.

Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Interest and other income, development and management services, general and administrative expenses, transaction costs, interest expense, depreciation and amortization expense, gains (losses) from investments in securities, gains (losses) from early extinguishments of debt, income from unconsolidated joint ventures, gains on consolidation of joint ventures, impairment loss, discontinued operations and noncontrolling interests are not included in Net Operating Income as internal reporting addresses these items on a corporate level.

Net Operating Income is not a measure of operating results or cash flows from operating activities as measured by accounting principles generally accepted in the United States of America, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity. All companies may not calculate Net Operating Income in the same manner. The Company considers Net Operating Income to be an appropriate supplemental measure to net income because it helps both investors and management to understand the core operations of the Company’s properties.

We have modified the presentation of expenses to operate our San Francisco and Princeton regional offices to reflect the growing activity in our San Francisco region and to have a consistent presentation across our company. For San Francisco these expenses, which totaled approximately $6.7 million, $6.1 million and $6.0 million for the years ended December 31, 2013, 2012 and 2011, respectively, and for Princeton these expenses were approximately $1.4 million, $1.6 million and $1.5 million for the years ended December 31, 2013, 2012 and 2011, respectively, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses for all periods presented.

On May 31, 2013, the Company's two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties (See Note 3). Effective as of May 31, 2013, the Company accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting. Upon consolidation, the operations for this building are included in the New York region.

Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2013:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	665,991		$	662,888		$	62,678		$	214,755		$	381,359		$	1,987,671
Office/Technical	22,617			—			—			17,259			15,649			55,525
Residential	4,395			—			—			—			17,923			22,318
Hotel	40,330			—			—			—			—			40,330
Total	733,333			662,888			62,678			232,014			414,931			2,105,844
% of Grand Totals	34.82		%	31.48		%	2.98		%	11.02		%	19.70		%	100.00		%
Rental Expenses:
Class A Office	259,997			223,265			28,375			77,905			126,507			716,049
Office/Technical	6,879			—			—			3,708			4,190			14,777
Residential	1,823			—			—			—			10,307			12,130
Hotel	28,447			—			—			—			—			28,447
Total	297,146			223,265			28,375			81,613			141,004			771,403
% of Grand Totals	38.52		%	28.94		%	3.68		%	10.58		%	18.28		%	100.00		%
Net operating income	$	436,187		$	439,623		$	34,303		$	150,401		$	273,927		$	1,334,441
% of Grand Totals	32.69		%	32.94		%	2.57		%	11.27		%	20.53		%	100.00		%

For the year ended December 31, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	617,652		$	481,844		$	61,350		$	208,177		$	346,402		$	1,715,425
Office/Technical	22,460			—			—			494			16,264			39,218
Residential	3,936			—			—			—			16,632			20,568
Hotel	37,915			—			—			—			—			37,915
Total	681,963			481,844			61,350			208,671			379,298			1,813,126
% of Grand Totals	37.61		%	26.58		%	3.38		%	11.51		%	20.92		%	100.00		%
Rental Expenses:
Class A Office	242,904			160,386			27,601			75,542			111,049			617,482
Office/Technical	6,499			—			—			149			3,966			10,614
Residential	1,675			—			—			—			9,317			10,992
Hotel	28,120			—			—			—			—			28,120
Total	279,198			160,386			27,601			75,691			124,332			667,208
% of Grand Totals	41.85		%	24.04		%	4.14		%	11.34		%	18.63		%	100.00		%
Net operating income	$	402,765		$	321,458		$	33,749		$	132,980		$	254,966		$	1,145,918
% of Grand Totals	35.15		%	28.05		%	2.95		%	11.60		%	22.25		%	100.00		%

For the year ended December 31, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	537,743		$	458,791		$	62,648		$	207,003		$	340,470		$	1,606,655
Office/Technical	25,349			—			—			—			16,236			41,585
Residential	985			—			—			—			5,632			6,617
Hotel	34,529			—			—			—			—			34,529
Total	598,606			458,791			62,648			207,003			362,338			1,689,386
% of Grand Totals	35.43		%	27.16		%	3.71		%	12.25		%	21.45		%	100.00		%
Rental Expenses:
Class A Office	206,469			152,649			28,620			72,122			95,804			555,664
Office/Technical	7,245			—			—			—			4,280			11,525
Residential	521			—			—			—			4,958			5,479
Hotel	26,128			—			—			—			—			26,128
Total	240,363			152,649			28,620			72,122			105,042			598,796
% of Grand Totals	40.14		%	25.49		%	4.78		%	12.05		%	17.54		%	100.00		%
Net operating income	$	358,243		$	306,142		$	34,028		$	134,881		$	257,296		$	1,090,590
% of Grand Totals	32.85		%	28.07		%	3.12		%	12.37		%	23.59		%	100.00		%

The following is a reconciliation of Net Operating Income to net income attributable to Boston Properties, Inc.:

	Year ended December 31,
		2013		2012			2011
Net Operating Income		$	1,334,441	$	1,145,918		$	1,090,590
Add:
Development and management services income		29,695		34,060			33,406
Income from unconsolidated joint ventures		75,074		49,078			85,896
Gains on consolidation of joint ventures		385,991		—			—
Interest and other income		8,310		10,091			5,358
Gains (losses) from investments in securities		2,911		1,389			(443		)
Gains (losses) from early extinguishments of debt		122		(4,453		)	(1,494		)
Income from discontinued operations		8,022		9,806			10,876
Gains on sales of real estate from discontinued operations		112,829		36,877			—
Gain on forgiveness of debt from discontinued operations		20,182		—			—
Less:
General and administrative expense		115,329		90,129			87,101
Transaction costs		1,744		3,653			1,987
Depreciation and amortization expense		560,637		445,875			429,742
Interest expense		446,880		410,970			391,533
Impairment loss		8,306		—			—
Impairment loss from discontinued operations		3,241		—			—
Noncontrolling interest in property partnerships		1,347		3,792			1,558
Noncontrolling interest—redeemable preferred units of the Operating Partnership		6,046		3,497			3,339
Noncontrolling interest—common units of the Operating Partnership		70,085		30,125			35,007
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		14,151		5,075			1,243
Net income attributable to Boston Properties, Inc.		$	749,811	$	289,650		$	272,679

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Selected Interim Financial Information (unaudited)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

9.    Selected Interim Financial Information (unaudited)

The tables below reflect the Company’s selected quarterly information for the years ended December 31, 2013 and 2012. Total revenue and income from continuing operations amounts have been reclassified for properties qualifying for discontinued operations presentation (See Note 3).

	2013 Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	(in thousands, except for per share amounts)
Total revenue	$	477,826	$	510,033	$	571,481	$	576,199
Income from continuing operations	$	38,496	$	503,446	$	82,311	$	79,395
Net income attributable to Boston Properties, Inc.	$	47,854	$	452,417	$	152,677	$	88,719
Income attributable to Boston Properties, Inc. per share—basic	$	0.32	$	2.95	$	1.00	$	0.58
Income attributable to Boston Properties, Inc. per share—diluted	$	0.31	$	2.94	$	1.00	$	0.58

	2012 Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	(in thousands, except for per share amounts)
Total revenue	$	438,722	$	466,197	$	464,220	$	478,047
Income from continuing operations	$	53,079	$	94,795	$	63,331	$	74,251
Net income attributable to Boston Properties, Inc.	$	48,454	$	118,559	$	57,249	$	65,400
Income attributable to Boston Properties, Inc. per share—basic	$	0.33	$	0.79	$	0.38	$	0.43
Income attributable to Boston Properties, Inc. per share—diluted	$	0.33	$	0.78	$	0.38	$	0.43

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Summary Of Significant Accounting Policies GAAP Reconciliation Of Net Income To Taxable Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of GAAP net income to taxable income [Abstract]
Net income attributable to Boston Properties, Inc.	$ 88,719	$ 152,677	$ 452,417	$ 47,854	$ 65,400	$ 57,249	$ 118,559	$ 48,454	$ 749,811	$ 289,650	$ 272,679
Straight line rent adjustments									(74,445)	(80,281)	(77,422)
Book/tax differences from depreciation and amortization									170,370	105,599	117,675
Book/tax differences on gains/losses from capital transactions									(124,413)	(22,408)	(38,443)
Book/tax differences from stock-based compensation									42,146	19,660	827
Other book/tax differences, net									(12,797)	35,461	29,389
Taxable Income									$ 750,672	$ 347,681	$ 304,705

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Stock Option and Incentive Plan Stock Option and Incentive Plan and Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2013

Stock Option and Incentive Plan and Stock Purchase Plan [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares		Weighted Average Exercise Price
Outstanding at December 31, 2010	324,938		$	32.65
Granted	146,844		$	92.71
Exercised	(316,159	)	$	32.63
Canceled	—		$	—
Outstanding at December 31, 2011	155,623		$	89.35
Granted	186,007		$	107.23
Exercised	(22,823	)	$	72.42
Canceled	(24,280	)	$	100.15
Outstanding at December 31, 2012	294,527		$	101.06
Granted	252,220		$	104.50
Exercised	—		$	—
Canceled	—		$	—
Special dividend adjustment	12,076		$	100.44
Outstanding at December 31, 2013	558,823		$	100.43

Schedule of Stock Options Outstanding [Table Text Block]

The following table summarizes information about stock options outstanding at December 31, 2013:

Options Outstanding						Options Exercisable
Exercise Prices		Number Outstanding at 12/31/13	Remaining Contractual Life	Exercise Price		Number Exercisable at 12/31/13	Exercise Price
$	90.71	131,837	7.1 years	$	90.71	80,240	$	90.71
$	99.94	51,971	9.3 years	$	99.94	—	$	—
$	102.83	205,821	9.1 years	$	102.83	48,026	$	102.83
$	105.25	169,194	8.1 years	$	105.25	71,602	$	105.25

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 841,440		$ 332,139		$ 313,826
Other comprehensive income:
Amortization of interest rate contracts	2,513	[1]	2,594	[1]	2,595	[1]
Other Comprehensive income	2,513		2,594		2,595
Comprehensive income	843,953		334,733		316,421
Net income attributable to noncontrolling interests	(91,629)		(42,489)		(41,147)
Other comprehensive income attributable to noncontrolling interests	(252)		(273)		(297)
Comprehensive income attributable to Boston Properties, Inc.	$ 752,072		$ 291,971		$ 274,977

[1] Amounts reclassified from comprehensive income primarily to interest expense within the Company's Consolidated Statements of Operations

XML

Stock Option and Incentive Plan Schedule of Stock Options Outstanding (Details) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Exercise Price of $90.71 [Member]	Dec. 31, 2013 Exercise Price of $99.94 [Member]	Dec. 31, 2013 Exercise Price of $102.83 [Member]	Dec. 31, 2013 Exercise Price of $105.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price					$ 90.71	$ 99.94	$ 102.83	$ 105.25
Weighted Average Remaining Contractual Life (Years)					7 years 1 month 6 days	9 years 3 months 18 days	9 years 1 month 6 days	8 years 1 month 6 days
Number Outstanding at 12/31/13,	558,823	294,527	155,623	324,938	131,837	51,971	205,821	169,194
Outstanding, Weighted Average Exercise Price	$ 100.43	$ 101.06	$ 89.35	$ 32.65	$ 90.71	$ 99.94	$ 102.83	$ 105.25
Number Exercisable at 12/31/2013		91,496	13,633		80,240	0	48,026	71,602
Exercisable, Weighted Average Exercise Price		$ 98.92	$ 54.32		$ 90.71	$ 0.00	$ 102.83	$ 105.25

XML

Real Estate

12 Months Ended

Dec. 31, 2013

Real Estate [Abstract]

Real Estate

Real Estate

Real estate consisted of the following at December 31 (in thousands):

	2013			2012
Land	$	4,450,532		$	2,605,162
Land held for future development	297,376			275,094
Buildings and improvements	11,065,113			9,517,343
Tenant improvements	1,617,401			1,435,508
Furniture, fixtures and equipment	25,164			23,441
Construction in progress	1,523,179			1,036,780
Total	18,978,765			14,893,328
Less: Accumulated depreciation	(3,161,571		)	(2,934,160		)
	$	15,817,194		$	11,959,168

Acquisitions

On February 6, 2013, the Company completed the acquisition of 535 Mission Street, a development site, in San Francisco, California for an aggregate purchase price of approximately $71.0 million in cash, including work completed and materials purchased to date. When completed, 535 Mission Street will consist of a 27-story, Class A office tower with approximately 307,000 net rentable square feet of office and retail space. The property is currently under development.

On March 26, 2013, a consolidated joint venture in which the Company has a 95% interest completed the acquisition of a land parcel in San Francisco, California that will support a 60-story, 1.4 million square foot office tower known as Transbay Tower. The purchase price for the land was approximately $192.0 million. On February 7, 2013, the partner in the joint venture issued a notice that it was electing under the joint venture agreement to reduce its nominal ownership interest in the venture from 50% to 5%. On February 26, 2013, the Company issued a notice to the partner electing to proceed with the venture on that basis. As a result, the Company has a 95% nominal interest in and is consolidating the joint venture (See Note 11). The initial phase of the development consisting of building the project to grade is currently under development.

On March 29, 2013, the Company completed the acquisition of a parcel of land located in Reston, Virginia for a purchase price of approximately $27.0 million. The land parcel is commercially zoned for 250,000 square feet of office space.

On April 10, 2013, the Company acquired the Mountain View Research Park and Mountain View Technology Park properties from Boston Properties Office Value-Added Fund, L.P. (the "Value-Added Fund") for an aggregate net purchase price of approximately $233.1 million. Mountain View Research Park is a 16-building complex of Office/Technical properties aggregating approximately 604,000 net rentable square feet. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. The following table summarizes the allocation of the aggregate purchase price of Mountain View Research Park and Mountain View Technology Park at the date of acquisition (in thousands) in accordance with the guidance in ASC 805 "Business Combinations."

Land	$	126,521
Building and improvements	82,451
Tenant improvements	7,326
In-place lease intangibles	23,279
Above-market rents	843
Below-market rents	(7,336		)
Net assets acquired	$	233,084

On May 31, 2013, the Company's two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City) transferred all of their interests in the joint venture to third parties. 767 Fifth Avenue (the General Motors Building) is a Class A office property totaling approximately 1.8 million net rentable square feet. In connection with the transfer, the Company and its new joint venture partners modified the Company's relative decision making authority and consent rights with respect to the joint venture's assets and operations. These changes resulted in the Company having sufficient financial and operating control over 767 Venture, LLC such that, effective as of May 31, 2013, the Company accounts for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in its financial statements instead of under the equity method of accounting (See Notes 5 and 11). The following table summarizes the allocation of the aggregate purchase price of 767 Fifth Avenue (the General Motors Building) at the date of consolidation on May 31, 2013 (in thousands) in accordance with the guidance in ASC 805 "Business Combinations."

.

Real estate and related intangibles recorded upon consolidation
Land	$	1,796,252
Building and improvements	1,447,446
Tenant improvements	85,208
In-place lease intangibles	357,781
Above market rents	101,897
Below market rents	(239,641		)
Above market assumed debt adjustments	(192,943		)
	$	3,356,000
Debt recorded upon consolidation
Mortgage notes payable	$	(1,300,000	)
Mezzanine notes payable	(306,000		)
Members' notes payable	(450,000		)	(1)
	$	(2,056,000	)
Working capital recorded upon consolidation
Cash and cash equivalents	$	79,468
Cash held in escrows	2,403
Tenant and other receivables	7,104
Prepaid expenses and other assets	4,269
Accounts payable and accrued expenses	(2,418		)
Accrued interest payable	(182,369		)	(2)
Other liabilities	(6,304		)
	$	(97,847	)
Noncontrolling interest recorded upon consolidation
Noncontrolling interests	$	(520,000	)
Noncontrolling interests - working capital	39,139
	$	(480,861	)
Net assets recorded upon consolidation	$	721,292

_______________

(1) The Company's member loan totaling $270.0 million eliminates in consolidation.

(2) The Company's share of the accrued interest payable on the members' loans totaling approximately $105.5 million eliminates in consolidation.

Mountain View Research Park and Mountain View Technology Park contributed approximately $16.7 million of revenue and approximately $0.4 million of earnings to the Company for the period from April 10, 2013 through December 31, 2013. 767 Fifth Avenue (the General Motors Building) contributed approximately $168.4 million of revenue and approximately $8.4 million of earnings to the Company for the period from May 31, 2013 through December 31, 2013.

The accompanying unaudited pro forma information for the years ended December 31, 2013 and 2012 is presented as if the operating property acquisitions of (1) Mountain View Research Park and Mountain View Technology Park on April 10, 2013 and the approximately $26.5 million gain on consolidation and (2) 767 Fifth Avenue (the General Motors Building) on May 31, 2013 and the approximately $359.5 million gain on consolidation, had occurred on January 1, 2012. This unaudited pro forma information is based upon the historical consolidated financial statements of the Company and should be read in conjunction with the consolidated financial statements and notes thereto. This pro forma information does not purport to represent what the actual results of operations of the Company would have been had the above occurred, nor do they purport to predict the results of operations of future periods.

Pro Forma (Unaudited)	Year ended December 31,
(in thousands, except per share data)	2013		2012
Total revenue	$	2,257,098	$	2,149,391
Income from continuing operations	$	302,354	$	634,457
Net income attributable to Boston Properties, Inc.	$	400,017	$	626,174
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	2.58	$	4.15
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	2.57	$	4.13

Developments

On March 22, 2013, the Company completed and fully placed in-service Two Patriots Park, a Class A office redevelopment project with approximately 256,000 net rentable square feet located in Reston, Virginia.

On April 25, 2013, the Company commenced construction of its 601 Massachusetts Avenue, a Class A office development project totaling approximately 478,000 net rentable square feet located in Washington, DC.

On June 14, 2013, the Company completed and fully placed in-service Seventeen Cambridge Center, a Class A office project with approximately 195,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2013, the Company completed and fully placed in-service its Cambridge Center Connector, a Class A office project with approximately 43,000 net rentable square feet located in Cambridge, Massachusetts.

On October 29, 2013, the Company entered into a lease agreement as landlord with a third-party tenant for a build-to-suit project with approximately 130,000 net rentable square feet of Class A office space located in Princeton, New Jersey.

As of December 31, 2013, the Company has placed in-service approximately 63% of The Avant at Reston Town Center development project comprised of 359 apartment units and retail space aggregating approximately 355,000 square feet located in Reston, Virginia (See Note 20).

As of December 31, 2013, the Company has placed in-service approximately 6% of its 250 West 55th Street development project. When completed, this project will consist of approximately 989,000 net rentable square feet of Class A office space located in New York City.

As of December 31, 2013, the Company has placed in-service approximately 1% of its 680 Folsom Street development project. When completed, this project will consist of approximately 525,000 net rentable square feet of Class A office space located in San Francisco, California.

Dispositions

On February 20, 2013, the foreclosure sale of the Company's Montvale Center property was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million. The operating results of the property through the date of ratification have been classified as discontinued operations on a historical basis for all periods presented.

On June 28, 2013, the Company completed the sale of its 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. Net cash proceeds totaled approximately $39.3 million. 303 Almaden Boulevard is a Class A office property totaling approximately 158,000 net rentable square feet. Because the Company entered into the related purchase and sale agreement on March 28, 2013 and the carrying value of the property exceeded its net sale price, the Company recognized an impairment loss totaling approximately $3.2 million during the three months ended March 31, 2013. As a result, there was no loss on sale of real estate recognized during the year ended December 31, 2013. The impairment loss and operating results of this property have been classified as discontinued operations on a historical basis for all periods presented. The sale of this asset caused the Company to reevaluate its strategy for development of its adjacent Almaden land parcel, which can accommodate an approximately 840,000 square feet office complex.  Based on a shorter than expected hold period, the Company reduced the carrying value of the land parcel to its estimated fair market value and recognized an impairment loss of approximately $8.3 million during the three months ended March 31, 2013. The Company's estimated fair value, as measured on a non-recurring basis, was based on comparable land sales. The Company has determined that its valuation of the land falls within Level 3 of the fair value hierarchy, as it has utilized significant unobservable inputs in its assessment.

On August 22, 2013, the Company completed the sale of its 1301 New York Avenue property located in Washington, DC for a net contract sale price of approximately $121.7 million. After adjusting for outstanding lease and other transaction costs assumed by the buyer, the gross sale price was approximately $135.0 million. Net cash proceeds totaled approximately $121.5 million, resulting in a gain on sale of approximately $86.4 million. 1301 New York Avenue is a Class A office property totaling approximately 201,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On October 9, 2013, the Company completed the sale of a 45% ownership interest in its Times Square Tower property for a gross sale price of $684.0 million in cash. Net cash proceeds totaled approximately $673.1 million, after the payment of transaction costs. In connection with the sale, the Company formed a joint venture with the buyer and will provide customary property management and leasing services to the joint venture. Times Square Tower is an approximately 1,246,000 net rentable square foot Class A office tower located in New York City. The transaction did not qualify as a sale of real estate for financial reporting purposes because the Company continues to control the joint venture and will therefore continue to account for the entity on a consolidated basis in its financial statements. The Company has accounted for the transaction as an equity transaction and has recognized noncontrolling interest in its consolidated balance sheets totaling approximately $243.5 million, which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction. The difference between the net cash proceeds received and the noncontrolling interest recognized, which difference totals approximately $429.6 million, has not been reflected as a gain on sale of real estate in the Company’s consolidated statements of operations and has instead been reflected as an increase to additional paid-in capital in the Company’s consolidated balance sheets.

On December 20, 2013, the Company completed the sale of its 10 & 20 Burlington Mall Road property located in Burlington, Massachusetts for a sale price of approximately $30.0 million. Net cash proceeds totaled approximately $29.4 million, resulting in a gain on sale of approximately $20.5 million. 10 & 20 Burlington Mall Road consists of two Class A office properties aggregating approximately 152,000 net rentable square feet. The operating results of the properties through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

On December 20, 2013, the Company completed the sale of its One Preserve Parkway property located in Rockville, Maryland for a sale price of approximately $61.3 million. Net cash proceeds totaled approximately $59.9 million, resulting in a gain on sale of approximately $5.9 million. One Preserve Parkway is a Class A office property totaling approximately 184,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

The following table summarizes the income from discontinued operations related to One Preserve Parkway, 10 & 20 Burlington Mall Road, 1301 New York Avenue, 303 Almaden Boulevard, Montvale Center and Bedford Business Park and the related gains on sales of real estate, gain on forgiveness of debt and impairment loss for the years ended December 31, 2013, 2012 and 2011:

	For the year ended December 31,
	2013			2012			2011
	(in thousands)
Total revenue	$	20,138		$	32,607		$	36,734
Expenses
Operating	6,996			12,038			13,818
Depreciation and amortization	4,760			8,169			9,442
Total expenses	11,756			20,207			23,260
Operating income	8,382			12,400			13,474
Other expense
Interest expense	360			2,594			2,598
Income from discontinued operations	$	8,022		$	9,806		$	10,876
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership	(803		)	(1,031		)	(1,243		)
Income from discontinued operations attributable to Boston Properties, Inc.	$	7,219		$	8,775		$	9,633
Gains on sales of real estate from discontinued operations	$	112,829		$	36,877		$	—
Gain on forgiveness of debt from discontinued operations	20,182			—			—
Impairment loss from discontinued operations	(3,241		)	—			—
Noncontrolling interest in gains on sales of real estate, gain on forgiveness of debt and impairment loss from discontinued operations – common units of the Operating Partnership	(13,348		)	(4,044		)	—
Gains on sales of real estate, gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	116,422		$	32,833		$	—

XML

Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details)	12 Months Ended
	Dec. 31, 2013
Square 407 Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Market Square North
Equity Method Investment, Ownership Percentage	50.00%
The Metropolitan Square Associates LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Metropolitan Square
Equity Method Investment, Ownership Percentage	51.00%
BP/CRF 901 New York Avenue LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	901 New York Avenue	[1]
Equity Method Investment, Ownership Percentage	25.00%	[1]
WP Project Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Wisconsin Place Land and Infrastructure	[2]
Equity Method Investment, Ownership Percentage	33.30%	[2]
RBP Joint Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	N/A	[3]
Equity Method Investment, Ownership Percentage	50.00%	[3]
Boston Properties Office Value-Added Fund, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Properties	N/A	[4]
Equity Method Investment, Ownership Percentage	39.50%	[4]
Annapolis Junction NFM, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Annapolis Junction	[5]
Equity Method Investment, Ownership Percentage	50.00%	[5]
Number of real estate properties	2
Number of buildings under construction	1
Parcels of undeveloped land	2
2 GCT Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	N/A	[6]
Equity Method Investment, Ownership Percentage	60.00%	[6]
540 Madison Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	540 Madison Avenue
Equity Method Investment, Ownership Percentage	60.00%
125 West 55th Street Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	N/A	[7]
Equity Method Investment, Ownership Percentage	60.00%	[7]
500 North Capitol LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	500 North Capitol Street, NW
Equity Method Investment, Ownership Percentage	30.00%
Entity Owning Land And Infrastructure Of Project [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	33.30%

[1] The Company’s economic ownership can increase based on the achievement of certain return thresholds.

[2] The Company’s wholly-owned entity that owns the office component of the project also owns a 33.3% interest in the entity owning the land, parking and infrastructure of the project.

[3] Eighth Avenue and 46th Street was sold on July 19, 2013.

[4] The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013 (See Note 3). As of December 31, 2013, the investment is comprised of undistributed cash.

[5] Comprised of two buildings, one building under construction and two undeveloped land parcels.

[6] Two Grand Central Tower was sold on October 25, 2011. As of December 31, 2013, the investment is comprised of undistributed cash.

[7] 125 West 55th Street was sold on May 30, 2013. As of December 31, 2013, the investment is comprised of undistributed cash.

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Segment Information Segment reporting (narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended									0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Princeton [Member]	Dec. 31, 2012 Princeton [Member]	Dec. 31, 2011 Princeton [Member]	Dec. 31, 2013 San Francisco [Member]	Dec. 31, 2012 San Francisco [Member]	Dec. 31, 2011 San Francisco [Member]	May 31, 2013 767 5th Avenue (The General Motors Building) [Member] partners
Segment Reporting Information [Line Items]
Reclassification between general and administrative expense and real estate operating expenses	$ 8.1	$ 7.7	$ 7.5	$ 1.4	$ 1.6	$ 1.5	$ 6.7	$ 6.1	$ 6.0
Number of Joint Venture Partners										2

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Commitments And Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Buildings
Commitments And Contingencies [Line Items]
Letter of credit and performance obligations	$ 13,900,000
Maturity Date	Feb. 15, 2014
Property insurance program per occurrence limits	1,000,000,000
Per occurrence limit for NBCR Coverage	1,000,000,000
Value of program trigger	100,000,000
Coinsurance of program trigger	15.00%
Deductible in insurance as a percentage of the value of the affected property, San Francisco	5.00%
Per occurrence limit of the earthquake insurance which covers San Francisco region	120,000,000
Annual aggregate limit of the earthquake insurance which covers San Francisco region	120,000,000
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco	20,000,000
Earthquake Coverage Included In Builders Risk Policy For 535 Mission	15,000,000
Earthquake Coverage Included In Builders Risk Policy For Below Grade improvements for Transbay Tower	15,000,000
Operating partnership guarantee to cover liabilities of IXP	20,000,000
Contractual Tax Agreements Number Of Properties	3
Expiration of Tax Protection for the General Motors Buidling	Jun. 09, 2017
767 Venture, LLC [Member]
Commitments And Contingencies [Line Items]
Maximum funding obligation	24,100,000
Property insurance program per occurrence limits	1,625,000,000
Coverage for acts of Terrorism certified under TRIA in excess of amount provided by NYXP, LLC, as a direct insurer	1,375,000,000
Coverage for acts of terrorism certified under TRIA covered by NYXP	250,000,000
John Hancock Tower [Member]
Commitments And Contingencies [Line Items]
Guarantee Obligation Related To Tenant Re-Leasing Costs	15,900,000
Maturity Date	Jan. 06, 2017
601 Lexington Avenue [Member]
Commitments And Contingencies [Line Items]
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP	$ 250,000,000

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Subsequent Events

12 Months Ended

Dec. 31, 2013

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On January 27, 2014, the Company's Compensation Committee approved the 2014 multi-year, long-term incentive program (the "2014 MYLTIP") awards under the Company's 2012 Plan to certain officers and employees of the Company. The 2014 MYLTIP awards utilize TRS over a three-year measurement period, on an annualized, compounded basis, as the performance metric. Earned awards will be based on the Company's TRS relative to (i) the Cohen & Steers Realty Majors Portfolio Index (50% weight) and (ii) the NAREIT Office Index adjusted to exclude the Company (50% weight). Earned awards will range from zero to a maximum of approximately $40.2 million depending on the Company's TRS relative to the two indices, with four tiers (threshold: approximately $6.7 million; target: approximately $13.4 million; high: approximately $26.8 million; exceptional: approximately $40.2 million) and linear interpolation between tiers. Earned awards measured on the basis of relative TRS performance are subject to an absolute TRS component in the form of relatively simple modifiers that (A) reduce the level of earned awards in the event the Company's annualized TRS is less than 0% and (B) cause some awards to be earned in the event the Company's annualized TRS is more than 12% even though on a relative basis alone the Company's TRS would not result in any earned awards.

Earned awards (if any) will vest 50% on February 3, 2017 and 50% on February 3, 2018, based on continued employment. Vesting will be accelerated in the event of a change in control, termination of employment by the Company without cause, termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to February 3, 2017, earned awards will be calculated based on TRS performance up to the date of the change of control. The 2014 MYLTIP awards are in the form of LTIP Units issued on the grant date which (i) are subject to forfeiture to the extent awards are not earned and (ii) prior to the performance measurement date are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units.

Under the Financial Accounting Standards Board's Accounting Standards Codification (“ASC”) 718 “Compensation-Stock Compensation” the 2014 MYLTIP awards have an aggregate value of approximately $13.1 million, which amount will generally be amortized into earnings over the four-year plan period under the graded vesting method.

On January 31, 2014, the Company issued 21,455 shares of restricted common stock and 109,718 LTIP units under the 2012 Plan to certain employees of the Company.

On January 31, 2014, the measurement period for the Company’s 2011 OPP Awards expired and the Company’s TRS performance was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Awards. As a result, the Company accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million. Accordingly, all 2011 OPP Awards were automatically forfeited and the Operating Partnership repaid employees an amount equal to $0.25 (which is equal to what they paid upon acceptance of the award) multiplied by the number of 2011 OPP Awards they received.

On February 10, 2014, the Company completed and fully placed in-service The Avant at Reston Town Center development project comprised of 359 apartment units and retail space aggregating approximately 355,000 square feet located in Reston, Virginia.

On February 18, 2014, the Company's Operating Partnership repaid at maturity the $747.5 million aggregate principal amount outstanding of its 3.625% Exchangeable Senior Notes due 2014 plus accrued and unpaid interest thereon.

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Noncontrolling Interests Redeemable Property Partnerships (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance	$ 97,558	$ 0
Acquisition Date Fair Value of Redeemable Interest		98,787
Net Loss	(1,839)	(719)
Distributions	(4,585)	(3,032)
Adjustment to Reflect Redeemable Interest at Redemption Value	8,475	2,522
Ending Balance	$ 99,609	$ 97,558

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Future Minimum Rents (Tables)

12 Months Ended

Dec. 31, 2013

Future Minimum Rents [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Years Ending December 31,	(in thousands)
2014	$	1,716,754
2015	1,706,282
2016	1,660,890
2017	1,510,645
2018	1,342,157
Thereafter	6,674,466

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Future Minimum Rents

12 Months Ended

Dec. 31, 2013

Future Minimum Rents [Abstract]

Future Minimum Rents [Text Block]

13.    Future Minimum Rents

The properties are leased to tenants under net operating leases with initial term expiration dates ranging from 2014 to 2048. The future contractual minimum lease payments to be received (excluding operating expense reimbursements) by the Company as of December 31, 2013, under non-cancelable operating leases which expire on various dates through 2048, are as follows: 

Years Ending December 31,	(in thousands)
2014	$	1,716,754
2015	1,706,282
2016	1,660,890
2017	1,510,645
2018	1,342,157
Thereafter	6,674,466

No single tenant represented more than 10.0% of the Company’s total rental revenue for the years ended December 31, 2013, 2012 and 2011.