10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the Quarterly Period Ended March 31, 2014

¨ 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 No.)

Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199-8103

(Address of principal executive offices) (Zip Code)

(617) 236-3300

(Registrant’s telephone number, including area code)

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 whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  x	Accelerated filer  ¨
Non-accelerated filer  ¨ (Do not check if a smaller reporting  company)	Smaller reporting company  ¨

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

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, par value $.01 per share	153,040,988
(Class)	(Outstanding on May 5, 2014)

BOSTON PROPERTIES, INC.

FORM 10-Q

for the quarter ended March 31, 2014

TABLE OF CONTENTS 

		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements (unaudited)		1
	a) Consolidated Balance Sheets as of March 31, 2014 and December 31, 2013		1
	b) Consolidated Statements of Operations for the three months ended March 31, 2014 and 2013		2
	c) Consolidated Statements of Comprehensive Income for the three months ended March 31, 2014 and 2013		3
	d) Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2014 and 2013		4
	e) Consolidated Statements of Cash Flows for the three months ended March 31, 2014 and 2013		5
	f) Notes to the Consolidated Financial Statements		7
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		25
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk		62
ITEM 4.	Controls and Procedures		62
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings		63
ITEM 1A.	Risk Factors		63
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds		63
ITEM 3.	Defaults Upon Senior Securities		63
ITEM 4.	Mine Safety Disclosures		63
ITEM 5.	Other Information		64
ITEM 6.	Exhibits		64
SIGNATURES			65

PART I. FINANCIAL INFORMATION

ITEM 1—Financial Statements.

BOSTON PROPERTIES, INC.

CONSOLIDATED BALANCE SHEETS

(Unaudited and in thousands, except for share and par value amounts)

	March 31, 2014			December 31, 2013
ASSETS
Real estate, at cost	$	17,258,665		$	17,158,210
Construction in progress		1,564,821			1,523,179
Land held for future development		300,498			297,376
Less: accumulated depreciation		(3,263,208	)		(3,161,571	)
Total real estate		15,860,776			15,817,194
Cash and cash equivalents		1,179,573			2,365,137
Cash held in escrows		54,240			57,201
Investments in securities		18,026			16,641
Tenant and other receivables (net of allowance for doubtful accounts of $1,625 and $1,636, respectively)		37,812			59,464
Accrued rental income (net of allowance of $3,448 and $3,636, respectively)		661,730			651,603
Deferred charges, net		861,567			884,450
Prepaid expenses and other assets		178,488			184,477
Investments in unconsolidated joint ventures		127,356			126,084
Total assets	$	18,979,568		$	20,162,251
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable	$	4,430,110		$	4,449,734
Unsecured senior notes (net of discount of $13,710 and $14,146, respectively)		5,836,290			5,835,854
Unsecured exchangeable senior notes (net of discount of $0 and $182, respectively)		—			744,880
Unsecured line of credit		—			—
Mezzanine notes payable		310,735			311,040
Outside members’ notes payable		180,000			180,000
Accounts payable and accrued expenses		218,028			202,470
Dividends and distributions payable		114,799			497,242
Accrued interest payable		178,651			167,523
Other liabilities		556,772			578,969
Total liabilities		11,825,385			12,967,712
Commitments and contingencies		—			—
Noncontrolling interests:
Redeemable preferred units of the Operating Partnership		51,312			51,312
Redeemable interest in property partnership		100,327			99,609
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 shares issued and outstanding at March 31, 2014 and December 31, 2013		200,000			200,000
Common stock, $.01 par value, 250,000,000 shares authorized, 153,096,211 and 153,062,001 issued and 153,017,311 and 152,983,101 outstanding at March 31, 2014 and December 31, 2013, respectively		1,530			1,530
Additional paid-in capital		5,668,230			5,662,453
Dividends in excess of earnings		(153,979	)		(108,552	)
Treasury common stock at cost, 78,900 shares at March 31, 2014 and December 31, 2013		(2,722	)		(2,722	)
Accumulated other comprehensive loss		(10,989	)		(11,556	)
Total stockholders’ equity attributable to Boston Properties, Inc.		5,702,070			5,741,153
Noncontrolling interests:
Common units of the Operating Partnership		575,381			576,333
Property partnerships		725,093			726,132
Total equity		7,002,544			7,043,618
Total liabilities and equity	$	18,979,568		$	20,162,251

The accompanying notes are an integral part of these consolidated financial statements.

1

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended March 31,
	2014			2013
	(in thousands, except for per share amounts)
Revenue
Rental
Base rent	$	455,018		$	373,046
Recoveries from tenants		81,934			64,319
Parking and other		24,333			23,437
Total rental revenue		561,285			460,802
Hotel revenue		8,193			8,291
Development and management services		5,216			8,733
Total revenue		574,694			477,826
Expenses
Operating
Rental		206,388			169,062
Hotel		6,797			7,044
General and administrative		29,905			45,516
Transaction costs		437			443
Impairment loss		—			8,306
Depreciation and amortization		154,270			119,453
Total expenses		397,797			349,824
Operating income		176,897			128,002
Other income (expense)
Income from unconsolidated joint ventures		2,816			8,721
Interest and other income		1,311			1,471
Gains from investments in securities		286			735
Interest expense		(113,554	)		(100,433	)
Income from continuing operations		67,756			38,496
Discontinued operations
Income from discontinued operations		—			2,494
Gain on forgiveness of debt from discontinued operations		—			20,182
Impairment loss from discontinued operations		—			(3,241	)
Net income		67,756			57,931
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(4,354	)		(2,574	)
Noncontrolling interest—redeemable preferred units of the Operating Partnership		(619	)		(1,180	)
Noncontrolling interest—common units of the Operating Partnership		(6,160	)		(4,111	)
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		—			(2,066	)
Net income attributable to Boston Properties, Inc.		56,623			48,000
Preferred dividends		(2,589	)		(146	)
Net income attributable to Boston Properties, Inc. common shareholders	$	54,034		$	47,854
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$	0.35		$	0.20
Discontinued operations		—			0.12
Net income	$	0.35		$	0.32
Weighted average number of common shares outstanding		153,030			151,646
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$	0.35		$	0.20
Discontinued operations		—			0.11
Net income	$	0.35		$	0.31
Weighted average number of common and common equivalent shares outstanding		153,169			151,952

The accompanying notes are an integral part of these consolidated financial statements.

2

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three months ended March 31,
	2014			2013
	(in thousands)
Net income	$	67,756		$	57,931
Other comprehensive income:
Amortization of interest rate contracts(1)		629			628
Other comprehensive income		629			628
Comprehensive income		68,385			58,559
Net income attributable to noncontrolling interests		(11,133	)		(9,931	)
Other comprehensive income attributable to noncontrolling interests		(62	)		(64	)
Comprehensive income attributable to Boston Properties, Inc.	$	57,190		$	48,564

(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.

3

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited and 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, 2013		152,983	$	1,530	$	200,000	$	5,662,453		$	(108,552	)	$	(2,722	)	$	(11,556	)	$	1,302,465		$	7,043,618
Redemption of operating partnership units to common stock		18		—		—		627			—			—			—			(627	)		—
Allocated net income for the year		—		—		—		—			56,623			—			—			8,746			65,369
Dividends/distributions declared		—		—		—		—			(102,050	)		—			—			(11,218	)		(113,268	)
Shares issued pursuant to stock purchase plan		4		—		—		357			—			—			—			—			357
Net activity from stock option and incentive plan		12		—		—		704			—			—			—			8,760			9,464
Contributions from noncontrolling interests in property partnerships		—		—		—		—			—			—			—			468			468
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(4,093	)		(4,093	)
Amortization of interest rate contracts		—		—		—		—			—			—			567			62			629
Reallocation of noncontrolling interest		—		—		—		4,089			—			—			—			(4,089	)		—
Equity, March 31, 2014		153,017	$	1,530	$	200,000	$	5,668,230		$	(153,979	)	$	(2,722	)	$	(10,989	)	$	1,300,474		$	7,002,544
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		9		—		—		272			—			—			—			(272	)		—
Allocated net income for the year		—		—		—		—			48,000			—			—			6,743			54,743
Dividends/distributions declared		—		—		—		—			(98,712	)		—			—			(11,446	)		(110,158	)
Issuance of 5.25% Series B cumulative redeemable preferred stock		—		—		200,000		(5,629	)		—			—			—			—			194,371
Shares issued pursuant to stock purchase plan		3		—		—		335			—			—			—			—			335
Net activity from stock option and incentive plan		27		—		—		4,262			—			—			—			16,544			20,806
Contributions from noncontrolling interests in property partnerships		—		—		—		—			—			—			—			10,421			10,421
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(750	)		(750	)
Amortization of interest rate contracts		—		—		—		—			—			—			564			64			628
Reallocation of noncontrolling interest		—		—		—		10,717			—			—			—			(10,717	)		—
Equity, March 31, 2013		151,640	$	1,516	$	200,000	$	5,232,030		$	(160,697	)	$	(2,722	)	$	(13,253	)	$	548,376		$	5,805,250

The accompanying notes are an integral part of these consolidated financial statements.

4

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the three months ended March 31,
	2014			2013
	(in thousands)
Cash flows from operating activities:
Net income	$	67,756		$	57,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		154,270			121,191
Non-cash compensation expense		10,380			25,783
Impairment loss		—			8,306
Income from unconsolidated joint ventures		(2,816	)		(8,721	)
Distributions of net cash flow from operations of unconsolidated joint ventures		1,431			12,921
Gains from investments in securities		(286	)		(735	)
Non-cash portion of interest expense		(7,676	)		10,561
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes		(92,979	)		—
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		2,961			(297	)
Tenant and other receivables, net		21,652			10,690
Accrued rental income, net		(10,127	)		(14,295	)
Prepaid expenses and other assets		5,989			18,684
Accounts payable and accrued expenses		1,288			(1,172	)
Accrued interest payable		11,128			30,158
Other liabilities		(22,197	)		(7,703	)
Tenant leasing costs		(16,565	)		(8,932	)
Total adjustments		56,453			179,498
Net cash provided by operating activities		124,209			237,429
Cash flows from investing activities:
Acquisitions of real estate		—			(289,816	)
Construction in progress		(97,025	)		(103,178	)
Building and other capital improvements		(17,510	)		(14,162	)
Tenant improvements		(31,551	)		(24,988	)
Repayments of notes receivable, net		—			184
Capital contributions to unconsolidated joint ventures		—			(113	)
Capital distributions from unconsolidated joint ventures		113			—
Investments in securities, net		(1,099	)		(918	)
Net cash used in investing activities		(147,072	)		(432,991	)

5

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the three months ended March 31,
	2014			2013
	(in thousands)
Cash flows from financing activities:
Repayments of mortgage notes payable		(6,630	)		(23,687	)
Repayment of unsecured exchangeable senior notes		(654,521	)		—
Deferred financing costs		(18	)		—
Net proceeds from preferred stock issuance		—			194,371
Net proceeds from equity transactions		(527	)		(559	)
Dividends and distributions		(496,330	)		(110,940	)
Contributions from noncontrolling interests in property partnerships		468			5,875
Distributions to noncontrolling interests in property partnerships		(5,143	)		(2,100	)
Net cash provided by (used in) financing activities		(1,162,701	)		62,960
Net decrease in cash and cash equivalents		(1,185,564	)		(132,602	)
Cash and cash equivalents, beginning of period		2,365,137			1,041,978
Cash and cash equivalents, end of period	$	1,179,573		$	909,376
Supplemental disclosures:
Cash paid for interest	$	220,790		$	74,492
Interest capitalized	$	17,709		$	14,418
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	$	9,393		$	7,475
Mortgage note payable extinguished through foreclosure	$	—		$	25,000
Real estate transferred upon foreclosure	$	—		$	7,508
Land improvements contributed by noncontrolling interest in property partnership	$	—		$	4,546
Dividends and distributions declared but not paid	$	114,799		$	110,886
Conversions of noncontrolling interests to stockholders’ equity	$	627		$	272
Issuance of restricted securities to employees	$	26,534		$	25,901

The accompanying notes are an integral part of these consolidated financial statements.

6

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 March 31, 2014 owned an approximate 89.5% (89.0% at March 31, 2013) 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”). On January 31, 2014, the measurement period for the Company’s 2011 OPP Unit awards expired and the Company’s total return to shareholders (“TRS”) was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Unit awards. Accordingly, all 2011 OPP Unit awards were automatically forfeited (See Note 7 and 10). In February 2013 and February 2014, the Company issued LTIP Units in connection with the granting to employees of multi-year, long-term incentive program (“MYLTIP”) awards (also referred to as “2013 MYLTIP Units” and “2014 MYLTIP Units,” respectively, and collectively as “MYLTIP Units”). Because the rights, preferences and privileges of OPP Units and 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 MYLTIP Units (See Notes 7 and 10).

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 8).

At March 31, 2014, 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 7).

• 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 7).

• 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”).

7

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 8).

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 March 31, 2014, the Company owned or had interests in a portfolio of 175 commercial real estate properties (the “Properties”) aggregating approximately 45.8 million net rentable square feet, including eight properties under construction totaling approximately 4.0 million net rentable square feet. In addition, the Company has structured parking for approximately 45,971 vehicles containing approximately 15.7 million square feet. At March 31, 2014, 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.

The Company owns or controls undeveloped land parcels totaling approximately 502.5 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.

2. Basis of Presentation and Summary of Significant Accounting Policies

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., generally executes all significant business relationships other than transactions involving securities of Boston Properties, Inc. 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.

The accompanying interim financial statements are unaudited; however, the financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and in conjunction with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the disclosures required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments (consisting solely of normal recurring matters) necessary for a fair statement of the financial statements for these interim periods have been included. The results of operations for the interim periods are not necessarily indicative of the results to be obtained for other interim periods or for the full fiscal year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all

8

disclosure required by accounting principles generally accepted in the United States of America. These financial statements should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report in the Company’s Form 10-K for its fiscal year ended December 31, 2013. Certain prior year amounts have been reclassified to conform to the current year presentation. In the third quarter of 2013, the Company 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 $1.9 million for the three months ended March 31, 2013 were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses. In addition, beginning on January 1, 2014, the properties that were historically part of the Company’s Princeton region are reflected as the suburban component of the Company’s New York region (See Note 11).

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 are 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 (as defined in the accounting standards for Fair Value Measurements and Disclosures) 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 March 31, 2014 and December 31, 2013 (in thousands):

	March 31, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,430,110	$	4,577,435	$	4,449,734		$	4,545,283
Mezzanine notes payable		310,735		310,764		311,040			311,064
Unsecured senior notes		5,836,290		6,145,060		5,835,854			6,050,517
Unsecured exchangeable senior notes		—		—		744,880	(1)		750,266
Total	$	10,577,135	$	11,033,259	$	11,341,508		$	11,657,130

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million at December 31, 2013.

Recent Accounting Pronouncements

On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity” (“ASU No. 2014-08”). ASU No. 2014-08 clarifies that discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method

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investment or other major parts of an entity). ASU No. 2014-08 is effective prospectively for reporting periods beginning after December 15, 2014. Early adoption is permitted, and the Company early adopted ASU No. 2014-08 during the first quarter of 2014. The Company’s adoption of ASU No. 2014-08 did not have a material impact on its consolidated financial statements.

3. Real Estate Activity During the Three Months Ended March 31, 2014

Developments

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.

Dispositions

The Company did not have any dispositions during the three months ended March 31, 2014. The following table summarizes the income from discontinued operations for the three months ended March 31, 2013 related to One Preserve Parkway, 10 & 20 Burlington Mall Road, 1301 New York Avenue, Montvale Center and 303 Almaden Boulevard and the related gain on forgiveness of debt and impairment loss:

	For the three months ended March 31, 2013
	(in thousands)
Total revenue	$	7,035
Expenses
Operating		2,443
Depreciation and amortization		1,738
Total expenses		4,181
Operating income		2,854
Other expense
Interest expense		360
Income from discontinued operations	$	2,494
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership		(253	)
Income from discontinued operations attributable to Boston Properties, Inc.	$	2,241
Gain on forgiveness of debt from discontinued operations	$	20,182
Impairment loss from discontinued operations		(3,241	)
Noncontrolling interest in gain on forgiveness of debt and impairment loss from discontinued operations – common units of the Operating Partnership		(1,813	)
Gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	15,128

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4. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at March 31, 2014:

Entity	Properties	Nominal % Ownership			Carrying Value of Investment
					(in thousands)
Square 407 Limited Partnership	Market Square North		50.0	%	$	(9,758	)
The Metropolitan Square Associates LLC	Metropolitan Square		51.0	%		6,236
BP/CRF 901 New York Avenue LLC	901 New York Avenue		25.0	%(1)		(2,509	)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure		33.3	%(2)		46,944
Boston Properties Office Value-Added Fund, L.P.	N/A		39.5	%(3)		(30	)
Annapolis Junction NFM, LLC	Annapolis Junction		50.0	%(4)		17,528
2 GCT Venture LLC	N/A		60.0	%(5)		(91	)
540 Madison Venture LLC	540 Madison Avenue		60.0	%		69,002
125 West 55th Street Venture LLC	N/A		60.0	%(6)		944
500 North Capitol LLC	500 North Capitol Street, NW		30.0	%		(910	)
					$	127,356

(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 garage and infrastructure of the project.

(3) The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013.

(4) Comprised of two buildings, one building under construction and two undeveloped land parcels (See also Note 12).

(5) Two Grand Central Tower was sold on October 25, 2011.

(6) 125 West 55th Street was sold on May 30, 2013.

Certain of the Company’s unconsolidated 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 Company’s unconsolidated joint ventures are as follows:

	March 31, 2014			December 31, 2013
	(in thousands)
ASSETS
Real estate and development in process, net	$	921,524		$	924,297
Other assets		158,375			163,149
Total assets	$	1,079,899		$	1,087,446
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	748,700		$	749,732
Other liabilities		19,593			28,830
Members’/Partners’ equity		311,606			308,884
Total liabilities and members’/partners’ equity	$	1,079,899		$	1,087,446
Company’s share of equity	$	155,807		$	154,726
Basis differentials (1)		(28,451	)		(28,642	)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	127,356		$	126,084

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(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 Company’s unconsolidated joint ventures are as follows:

	For the three months ended March 31,
	2014		2013
	(in thousands)
Total revenue(1)	$	38,034	$	135,650
Expenses
Operating		15,464		42,366
Depreciation and amortization		9,092		39,277
Total expenses		24,556		81,643
Operating income		13,478		54,007
Other expense
Interest expense		8,012		56,234
Net income (loss)	$	5,466	$	(2,227	)
Company’s share of net income (loss)	$	2,625	$	(1,858	)
Basis differential		191		444
Elimination of inter-entity interest on partner loan		—		10,135
Income from unconsolidated joint ventures	$	2,816	$	8,721

(1) Includes straight-line rent adjustments of $0.6 million and $4.0 million for the three months ended March 31, 2014 and 2013, respectively. Includes net below-market rent adjustments of $0.1 million and $20.4 million for the three months ended March 31, 2014 and 2013, respectively.

5. Unsecured Exchangeable Senior Notes

On February 18, 2014, the Company’s Operating Partnership repaid at maturity the $747.5 million aggregate principal amount of its 3.625% exchangeable senior notes due 2014 plus accrued and unpaid interest thereon.

6. 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 $13.2 million related to lender and development requirements.

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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. With limited exception, under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners (See also Note 7).

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 March 31, 2014, the maximum funding obligation under the guarantee was approximately $11.7 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 $21.4 million related to its obligations 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.

In 2009, the Company filed a general unsecured creditor’s claim against Lehman Brothers, Inc. for $45.3 million related to its rejection of a lease at 399 Park Avenue in New York City. On January 10, 2014, the trustee for the liquidation of Lehman Brothers allowed the Company’s claim in the amount of $45.2 million. Similar claims have recently been quoted privately within a range of $0.42 to $0.45 per $1.00 of claim. The Company is currently evaluating whether to attempt to sell the claim or wait until the trustee distributes proceeds from the Lehman estate. There can be no assurance as to the timing or amount of potential income, if any, that may ultimately be realized on the claim, whether by sale to a third party or by distribution from the trustee, and accordingly, the Company is disclosing this as a gain contingency.

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 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. 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

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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 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’s $1.0 billion portfolio property insurance program and the $250 million of additional Terrorism Coverage for 601 Lexington Avenue will continue to provide Terrorism Coverage through the expiration of the program on March 1, 2015, (ii) the Company will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (iii) if such insurance is not available at commercially reasonable rates with limits equal to our current coverage or at all, the Company may not continue to have full occurrence limit coverage for acts of terrorism, (iv) the Company may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (v) the Company may not be able to obtain future debt financings secured by individual properties and (vi) the Company may cancel the insurance policies issued by IXP for the NBCR Coverage 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 Salesforce Tower (formerly 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 Salesforce Tower (formerly 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 and the Company’s NBCR Coverage. 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

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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.

7. 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 March 31, 2014, the noncontrolling interests in the Operating Partnership consisted of 15,583,853 OP Units, 1,554,353 LTIP Units, 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units, 483,555 2014 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 (none of which are convertible into OP Units) held by parties other than the Company.

Noncontrolling Interest—Redeemable Preferred Units of the Operating Partnership

The Preferred Units at March 31, 2014 included 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). On March 11, 2014, the Company notified the holders of the outstanding Series Two Preferred Units that it had elected to redeem all of such Series Two Preferred Units on May 12, 2014. As a result of the Company’s election to redeem the units, all of the holders of the Series Two Preferred Units have elected to convert such units into 1.312336 OP Units, or an aggregate of 874,168 OP Units on or before May 12, 2014. 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.

On February 18, 2014, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit.

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The Preferred Units at March 31, 2014 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 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 February 18, 2014, 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 three months ended March 31, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	51,312
Net income		619
Distributions		(619	)
Balance at March 31, 2014	$	51,312
Balance at January 1, 2013	$	110,876
Net income		1,180
Distributions		(1,180	)
Balance at March 31, 2013	$	110,876

Noncontrolling Interest—Redeemable Interest in Property Partnership

On October 4, 2012, the Company completed the formation of a joint venture that 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.

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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 three months ended March 31, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	99,609
Net loss		(106	)
Distributions		(1,050	)
Adjustment to reflect redeemable interest at redemption value		1,874
Balance at March 31, 2014	$	100,327
Balance at January 1, 2013	$	97,558
Net loss		(525	)
Distributions		(1,350	)
Adjustment to reflect redeemable interest at redemption value		2,533
Balance at March 31, 2013	$	98,216

Noncontrolling Interest—Common Units of the Operating Partnership

During the three months ended March 31, 2014, 18,528 OP Units were presented by the holders for redemption (including 17,191 OP Units issued upon conversion of LTIP Units) and were redeemed by the Company in exchange for an equal number of shares of Common Stock.

At March 31, 2014, the Company had outstanding 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units and 483,555 2014 MYLTIP Units. Prior to the measurement date (February 6, 2015 for 2012 OPP Units, February 4, 2016 for 2013 MYLTIP Units and February 3, 2017 for 2014 MYLTIP Units), holders of OPP Units and MYLTIP Units will be 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 MYLTIP Units, both vested and unvested, that OPP and MYLTIP award recipients have earned, if any, based on the establishment of a performance 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 31, 2014, the measurement period for the Company’s 2011 OPP Unit awards expired and the Company’s TRS was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Unit awards. Accordingly, all 2011 OPP Unit awards were automatically forfeited.

On January 29, 2014, the Operating Partnership paid a special cash distribution on the OP Units and LTIP Units in the amount of $2.25 per unit, a regular cash 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 December 31, 2013. The special cash distribution was in addition to the regular quarterly distribution on the OP Units and LTIP Units. Holders of the 2011 OPP Units, 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units are not entitled to receive any special distributions. Holders of Series Two Preferred Units will participate in the special cash distribution in connection with their conversion to OP Units in May 2014 as provided in the Operating Partnership’s partnership agreement. On March 18, 2014, Boston Properties, Inc., as general partner of the Operating Partnership, declared a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit and a distribution on the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units in the amount of $0.065 per unit, in each case payable on April 30, 2014 to holders of record as of the close of business on March 31, 2014.

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

17

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 March 31, 2014 was approximately $2.0 billion and $100.1 million, respectively, based on the closing price of the Company’s common stock of $114.53 per share on March 31, 2014.

Noncontrolling Interests—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 $725.1 million at March 31, 2014 and approximately $726.1 million at December 31, 2013, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

On February 7, 2013, the partner in the Company’s Salesforce Tower (formerly 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. In addition, if the Company elects to fund the construction of Salesforce Tower without a construction loan (or a construction loan of less than 50% of project costs), then the partner has the option to require the Company to fund up to 2.5% of the total project costs (i.e., of 50% of the partner’s 5% interest in the venture) in the form of a loan to the partner. This loan would bear interest at the then prevailing market construction loan interest rates. 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 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.

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,

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which is equal to 45% of the carrying value of the total equity of the property immediately prior to the transaction.

8. Stockholders’ Equity

As of March 31, 2014, the Company had 153,017,311 shares of Common Stock outstanding.

As of March 31, 2014, 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 three months ended March 31, 2014.

During the three months ended March 31, 2014, the Company issued 18,528 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from third parties.

On January 29, 2014, the Company paid a special cash dividend and regular quarterly dividend aggregating $2.90 per share of Common Stock to shareholders of record as of the close of business on December 31, 2013. On March 18, 2014, the Company’s Board of Directors declared a dividend of $0.65 per share of Common Stock payable on April 30, 2014 to shareholders of record as of the close of business on March 31, 2014.

As of March 31, 2014, the Company had 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) outstanding of its 5.25% Series B Cumulative Redeemable Preferred Stock with a liquidation preference of $2,500.00 per share ($25.00 per depositary share). 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 February 18, 2014, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On March 18, 2014, the Company’s Board of Directors declared a dividend of $32.8125 per share of Series B Preferred Stock payable on May 15, 2014 to shareholders of record as of the close of business on May 5, 2014.

9. 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 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 MYLTIP Units require the Company to outperform absolute and relative return thresholds, unless such thresholds have been met

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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 three months ended March 31, 2014
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	54,034		153,030	$	0.35
Effect of Dilutive Securities:
Stock Based Compensation		—		139		—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	54,034		153,169	$	0.35

	For the three months ended March 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.	$	30,485		151,646	$	0.20
Discontinued operations attributable to Boston Properties, Inc.		17,369		—		0.12
Net income attributable to Boston Properties, Inc. common shareholders	$	47,854		151,646	$	0.32
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		306		(0.01	)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	47,854		151,952	$	0.31

10. Stock Option and Incentive Plan

On January 27, 2014, the Company’s Compensation Committee approved 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, if any, 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 $0 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; and 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

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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 as of the date of the change of control based upon performance through such date as measured against performance hurdles (without proration). 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 $12.7 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 measurement period for the Company’s 2011 OPP Unit awards expired and the Company’s TRS was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Unit awards. Accordingly, all 2011 OPP Unit awards were automatically forfeited.

During the three months ended March 31, 2014, the Company issued 21,455 shares of restricted common stock, no non-qualified stock options, 121,567 LTIP Units and 485,459 2014 MYLTIP Units to employees under the 2012 Plan. Employees paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and 2014 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. The shares of restricted stock granted during the three months ended March 31, 2014 were valued at approximately $2.3 million ($108.09 per share). The LTIP Units granted were valued at approximately $12.2 million ($100.16 per unit weighted-average fair value) using a Monte Carlo simulation method model. The per unit fair value of each LTIP Unit granted was estimated on the date of grant using the following assumptions: an expected life of 5.7 years, a risk-free interest rate of 1.84% and an expected price volatility of 27%. As the 2011 OPP Units, 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2011 OPP Units, 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units 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, 2013 MYLTIP Units and 2014 MYLTIP Units was approximately $9.9 million and $25.5 million for the three months ended March 31, 2014 and 2013, respectively. On January 31, 2014, the measurement period for the Company’s 2011 OPP Awards expired and the Company’s TRS 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. For the three months ended March 31, 2013, stock-based compensation expense includes approximately $16.9 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. At March 31, 2014, there was $24.9 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $20.6 million of unrecognized compensation expense related to unvested 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 3.3 years.

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11. 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. Beginning on January 1, 2014, the properties that were historically part of the Princeton region are reflected as the suburban component of the New York region. The operations for the Princeton region, including the reclassification between Rental Operating Expenses and General and Administrative Expenses for the three months ended March 31, 2013 as detailed below, have been included in the New York region. The Company’s segments by geographic area are Boston, New York, 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 income, general and administrative expenses, transaction costs, impairment loss, interest expense, depreciation and amortization expense, gains from investments in securities, income from unconsolidated joint ventures, 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.

In the third quarter of 2013, the Company 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. For San Francisco these expenses, which totaled approximately $1.5 million for the three months ended March 31, 2013, and for Princeton these expenses, which totaled approximately $0.4 million for the three months ended March 31, 2013, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses.

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. 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 three months ended March 31, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	170,942		$	217,308		$	54,608		$	97,048		$	539,906
Office/Technical		5,820			—			6,217			3,660			15,697
Residential		1,163			—			—			4,519			5,682
Hotel		8,193			—			—			—			8,193
Total		186,118			217,308			60,825			105,227			569,478
% of Grand Totals		32.68	%		38.16	%		10.68	%		18.48	%		100.0	%
Rental Expenses:
Class A Office		71,398			74,371			19,313			33,439			198,521
Office/Technical		1,689			—			1,214			1,202			4,105
Residential		448			—			—			3,314			3,762
Hotel		6,797			—			—			—			6,797
Total		80,332			74,371			20,527			37,955			213,185
% of Grand Totals		37.68	%		34.89	%		9.63	%		17.80	%		100.0	%
Net operating income	$	105,786		$	142,937		$	40,298		$	67,272		$	356,293
% of Grand Totals		29.69	%		40.12	%		11.31	%		18.88	%		100.0	%

For the three months ended March 31, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	160,824		$	138,523		$	52,671		$	93,359		$	445,377
Office/Technical		5,653			—			151			4,043			9,847
Residential		1,067			—			—			4,511			5,578
Hotel		8,291			—			—			—			8,291
Total		175,835			138,523			52,822			101,913			469,093
% of Grand Totals		37.48	%		29.53	%		11.26	%		21.73	%		100.0	%
Rental Expenses:
Class A Office		65,287			49,088			18,373			30,755			163,503
Office/Technical		1,787			—			35			1,004			2,826
Residential		443			—			—			2,290			2,733
Hotel		7,044			—			—			—			7,044
Total		74,561			49,088			18,408			34,049			176,106
% of Grand Totals		42.35	%		27.87	%		10.45	%		19.33	%		100.0	%
Net operating income	$	101,274		$	89,435		$	34,414		$	67,864		$	292,987
% of Grand Totals		34.57	%		30.53	%		11.75	%		23.15	%		100.0	%

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The following is a reconciliation of Net Operating Income to net income attributable to Boston Properties, Inc.:

	Three months ended March 31,
	2014		2013
	(in thousands)
Net Operating Income	$	356,293	$	292,987
Add:
Development and management services income		5,216		8,733
Income from unconsolidated joint ventures		2,816		8,721
Interest and other income		1,311		1,471
Gains from investments in securities		286		735
Income from discontinued operations		—		2,494
Gain on forgiveness of debt from discontinued operations		—		20,182
Less:
General and administrative expense		29,905		45,516
Transaction costs		437		443
Depreciation and amortization expense		154,270		119,453
Interest expense		113,554		100,433
Impairment loss		—		8,306
Impairment loss from discontinued operations		—		3,241
Noncontrolling interest in property partnerships		4,354		2,574
Noncontrolling interest—redeemable preferred units of the Operating Partnership		619		1,180
Noncontrolling interest—common units of the Operating Partnership		6,160		4,111
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		—		2,066
Net income attributable to Boston Properties, Inc.	$	56,623	$	48,000

12. Subsequent Events

On April 10, 2014, a consolidated joint venture in which the Company has a 95% interest signed a lease with salesforce.com for 714,000 square feet at the new Salesforce Tower (formerly Transbay Tower), the 1.4 million square foot, 61-story Class A office development project currently under construction at 415 Mission Street in the South Financial District of San Francisco, California. In conjunction with the lease signing, the Company has committed to construct the building.

On April 10, 2014, the Company entered into a joint venture with an unrelated third party to acquire a parcel of land located at 501 K Street in Washington, DC. The Company anticipates the land parcel will accommodate an approximate 520,000 square foot Class A office property to be developed in the future. The joint venture partner contributed the land for its 50% interest in the joint venture and the Company contributed cash of approximately $39.0 million for its 50% interest.

On April 30, 2014, the Company’s partner in its Annapolis Junction joint venture contributed a parcel of land and improvements and the Company contributed cash of approximately $5.4 million. The Company has a 50% interest in this joint venture. The joint venture has commenced construction of Annapolis Junction Building Eight, which when completed will consist of a Class A office property with approximately 125,000 net rentable square feet located in Annapolis, Maryland.

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ITEM 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations

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.

The following discussion should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report. This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the federal securities laws. We caution investors that any forward-looking statements presented in this report, or which management may make orally or in writing from time to time, are based on beliefs and assumptions made by, and information currently available to, 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, tenant accounting considerations that may result in negotiated lease provisions that limit a tenant’s liability during construction, and public opposition to such activities);

• 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;

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• 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;

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

• the other risk factors identified in our most recently filed Annual Report on Form 10-K, including those described under the caption “Risk Factors.”

The risks set forth above are not exhaustive. Other sections of this report may 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 it 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 most recent Annual Report on Form 10-K and 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 Forms 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 are concentrated in four markets—Boston, New York, San Francisco and Washington, DC. 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 long-term space utilization and amenity needs in the local markets in which we operate, our relationships with

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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 the first quarter of 2014 was strong and exceeded our five-year quarterly average as we signed approximately 1.6 million square feet of leases covering vacant space, extensions and expansions, and pre-leasing for our development projects. However, we had approximately 1.4 million square feet of lease expirations and approximately 0.9 million square feet of leases with new and existing tenants that commenced in the quarter which resulted in a decline in occupancy in our portfolio during the quarter from 93.4% at December 31, 2013 to 92.4% at March 31, 2014.

In the New York region, overall leasing activity during the quarter remained strong and we completed approximately 537,000 square feet of leasing in twenty-four lease transactions, including three leases in Princeton totaling approximately 239,000 square feet. Activity in our portfolio has improved with same property occupancy increasing by 230 basis points to 92.2% as of March 31, 2014, with little near-term lease expirations. The demand in our CBD portfolio is driven by smaller tenants, primarily in the financial services industry. We also experienced activity from larger tenants and during the quarter we signed lease extensions with two tenants at 767 Fifth Avenue (the General Motors Building) for an aggregate of approximately 150,000 square feet. Subsequent to March 31, 2014, we executed a lease with a tenant for approximately 85,000 square feet at 250 West 55th Street. Our 250 West 55th Street development project has been partially placed in-service and the property is currently 73% leased and we expect to commence revenue recognition on a portion of the signed leases beginning in the second quarter of 2014 with revenue recognition on all currently signed leases by 2015. At 510 Madison Avenue, we completed seven leases during the quarter and are in lease negotiations with four more tenants, which, if signed, will bring the property to 95% leased.

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 94.7%. In addition, with the renewal of a 261,000 square foot tenant in Reston, Virginia, our suburban Washington, DC assets are 95.4% leased at March 31, 2014, with moderate rollover/exposure through 2014 of approximately 5.9%. 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 and thus near-term revenue, but would provide for more stable long-term revenues.

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 95.5% leased, with approximately

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205,000 square feet, or approximately 3.0%, of the Boston CBD portfolio vacancy leased to tenants that will commence in the future. 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 780,000 square feet of new leases, early renewals and relocations. However, the positive rental impact from these leases 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. We have approximately 651,000 square feet of lease expirations in 2014 and 2015 in these two buildings where we expect the tenant to vacate and we have not yet signed replacement tenants. The East Cambridge submarket is the strongest submarket in the region and our Cambridge portfolio is approximately 100% leased. During the quarter, we negotiated two early renewals with tenants in Cambridge at net rents that are approximately 50% above the current net rent. 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 291,000 square feet of leases during the quarter. In total, our suburban portfolio same property occupancy improved 740 basis points since March 31, 2013 from 78.4% to 85.8%.

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. Despite this positive trend, since December 31, 2013, occupancy in our assets in the San Francisco CBD and Silicon Valley submarkets has declined from 89.9% to 86.1% primarily due to a 165,000 lease expiration at 3120 Zanker Road in North San Jose, California. During the first quarter of 2014, we leased approximately 309,000 square feet, including an approximately 79,000 square foot lease at our 535 Mission Street development project. Construction of 535 Mission Street is on schedule and we expect to be able to deliver space to tenants in the fourth quarter of 2014. In addition, on April 10, 2014, we announced the signing of a 714,000 square foot lease with salesforce.com at our 1.4 million square foot Salesforce Tower (formerly Transbay Tower). With the execution of the lease, we have committed to complete the building in early 2017 at a projected total cost of approximately $1.1 billion.

The table below details the leasing activity during the three months ended March 31, 2014:

	Three Months Ended March 31, 2014
	Square Feet
Vacant space available at the beginning of the period		2,683,647
Property dispositions/properties taken out of service		—
Properties acquired vacant space		—
Properties placed in-service		—
Leases expiring or terminated during the period		1,361,837
Total space available for lease		4,045,484
1st generation leases		22,248
2nd generation leases with new tenants		486,633
2nd generation lease renewals		431,925
Total space leased		940,806
Vacant space available for lease at the end of the period		3,104,678
Second generation leasing information:(1)
Leases commencing during the period, in square feet		918,558
Average Lease Term		71 Months
Average Free Rent Period		62 Days
Total Transaction Costs Per Square Foot(2)	$	27.59
Increase / (decrease) in Gross Rents(3)		1.50	%
Increase / (decrease) in Net Rents(4)		1.29	%

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(1) Second generation leases are defined as leases for space that had previously been under lease by us. Of the 918,558 square feet of second generation leases that commenced during the three months ended March 31, 2014, leases for 673,712 square feet were signed in prior periods.

(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 745,359 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.

(4) Represents the increase/(decrease) in net rent (gross rent less operating expenses) on the new vs. expired leases on the 745,359 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.

From April 1, 2014 to December 31, 2014, leases representing approximately 4.0% of the space at our properties will expire. As these leases expire, assuming no change in current market rental rates, we expect that the gross rental rates we are likely to achieve on new leases will on average 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 2018. 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. During the first quarter, we fully placed in-service The Avant, our 359 unit residential project in Reston, Virginia. Each of our development projects underway is pre-certified USGB LEED Silver or higher. As of March 31, 2014, our current development pipeline, which excludes properties which are fully placed in-service, totals approximately 4.0 million square feet with a total projected investment of approximately $3.2 billion of which approximately $1.4 billion remains to be funded. Additionally, we are working on several new developments in each of our markets that could commence in 2014 or later.

Given investor demand for assets like ours we 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 and we are in various stages of the sale process for additional properties that we expect will exceed an aggregate of $1.0 billion in 2014. 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(ies) within limited time periods and the ownership structure of the properties being sold and acquired, and therefore we are not always able to sell an asset as part of a like-kind exchange. When successful, like-kind exchanges enable us to defer the taxable gain on the asset sold and thus limit our REIT distribution requirement and preserve capital. If we are unable to identify and acquire suitable replacement property(ies) 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.

We continue to maintain substantial liquidity, including available cash, as of May 5, 2014, of approximately $0.9 billion and approximately $990 million available under our Operating Partnership’s $1.0 billion Unsecured Line of Credit. Our more significant future funding requirements include approximately $1.4 billion of our

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development pipeline that remains to be funded through 2018 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 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.

Transactions during the three months ended March 31, 2014 included the following:

• On January 27, 2014, our Compensation Committee approved the 2014 Multi-Year Long-Term Incentive Program (the “2014 MYLTIP”) 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 2014 MYLTIP awards have an aggregate value of approximately $12.7 million, which amount will generally be amortized into earnings over the four-year plan period under the graded vesting method. As detailed in our proxy statement for our 2014 annual meeting of stockholders, this reflects the Compensation Committee’s decision to shift a significant portion of our incentive compensation from time-based to performance-based awards to build stronger pay-for-performance alignment with our stockholders.

• On January 31, 2014, the measurement period for our 2011 OPP Awards expired and our total return to shareholders (“TRS”) was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Awards. As a result, we accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million. Accordingly, all 2011 OPP Awards were automatically forfeited.

• On February 10, 2014, we 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. The retail space totaling approximately 26,000 net rentable square feet is 100% leased and the residential units are currently 32% leased.

• On February 18, 2014, our Operating Partnership repaid at maturity the $747.5 million aggregate principal amount of its 3.625% exchangeable senior notes due 2014 plus accrued and unpaid interest thereon.

Transactions completed subsequent to March 31, 2014:

• On April 10, 2014, a consolidated joint venture in which we have a 95% interest signed a lease with salesforce.com for 714,000 square feet at the new Salesforce Tower (formerly Transbay Tower), the 1.4 million square foot, 61-story Class A office development project currently under construction at 415 Mission Street in the South Financial District of San Francisco, California. In conjunction with the lease signing, we have committed to construct the building and expect to complete the building in early 2017 for a projected total cost of approximately $1.1 billion, which includes capitalized interest in accordance with generally accepted in the United States of America, or GAAP.

• On April 10, 2014, we entered into a joint venture with an unrelated third party to acquire a parcel of land located at 501 K Street in Washington, DC. We anticipate the land parcel will accommodate an approximate 520,000 square foot Class A office property to be developed in the future. The joint venture partner contributed the land for its 50% interest in the joint venture and we contributed cash of approximately $39.0 million for our 50% interest.

• On April 30, 2014, our partner in our Annapolis Junction joint venture contributed a parcel of land and improvements and we contributed cash of approximately $5.4 million. We have a 50% interest in this joint venture. The joint venture has commenced construction of Annapolis Junction Building Eight, which when completed will consist of a Class A office property with approximately 125,000 net rentable square feet located in Annapolis, Maryland.

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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.

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

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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. On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity” (“ASU No. 2014-08”). ASU No. 2014-08 clarifies that discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). ASU No. 2014-08 is effective prospectively for reporting periods beginning after December 15, 2014. Early adoption is permitted, and we early adopted ASU No. 2014-08 during the first quarter of 2014. Our adoption of ASU No. 2014-08 did not have a material impact on our consolidated financial statements.

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.

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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 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 4 to the Consolidated Financial Statements.

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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.

For the three months ended March 31, 2014, the impact of the net adjustments of rents from “above-” and “below-market” leases increased rental revenue by approximately $9.6 million. For the three months ended March 31, 2014, the impact of the straight-line rent adjustment increased rental revenue by approximately $9.7 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 4 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) acceptable-risk tenants;

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

• may require a security deposit; and/or

• may 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);

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

• tenant financial performance;

• economic conditions in a specific geographic region; and

• industry specific credit considerations.

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 March 31, 2014. 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.

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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 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 Statements of Operations for the three months ended March 31, 2014 and 2013.

At March 31, 2014 and March 31, 2013, we owned or had interests in a portfolio of 175 and 157 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 is necessarily meaningful. Therefore, the comparison of operating results for the three months ended March 31, 2014 and 2013 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

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presented as our Same Property Portfolio. The Same Property Portfolio therefore excludes properties placed in-service, acquired or consolidated 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, depreciation and amortization, interest expense, impairment loss, transaction costs, general and administrative expense, less discontinued operations, gains from investments in securities, 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 11 to the Consolidated Financial Statements.

Comparison of the three months ended March 31, 2014 to the three months ended March 31, 2013.

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 132 properties totaling approximately 35.9 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, 2013 and owned and in service through March 31, 2014. 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, 2013 or disposed of on or prior to March 31, 2014. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the three months ended March 31, 2014 and 2013 with respect to the properties that 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)	2014		2013		Increase/ (Decrease)			% Change			2014		2013		2014		2013		2014		2013			2014			2013			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	467,544	$	450,629	$	16,915			3.75	%	$	79,402	$	—	$	7,778	$	2,319	$	—	$	1,800		$	554,724		$	454,748		$	99,976			21.98	%
Termination Income		1,110		476		634			133.19	%		—		—		—		—		—		—			1,110			476			634			133.19	%
Total Rental Revenue		468,654		451,105		17,549			3.89	%		79,402		—		7,778		2,319		—		1,800			555,834			455,224			100,610			22.10	%
Real Estate Operating Expenses		175,608		165,232		10,376			6.28	%		23,901		—		3,899		787		—		310			203,408			166,329			37,079			22.29	%
Net Operating Income, excluding residential and hotel		293,046		285,873		7,173			2.51	%		55,501		—		3,879		1,532		—		1,490			352,426			288,895			63,531			21.99	%
Residential Net Operating Income(1)		2,471		2,845		(374	)		(13.15	)%															2,471			2,845			(374	)		(13.15	)%
Hotel Net Operating Income(1)		1,396		1,247		149			11.95	%		—		—		—		—		—		—			1,396			1,247			149			11.95	%
Consolidated Net Operating Income(1)		296,913		289,965		6,948			2.40	%		55,501		—		3,879		1,532		—		1,490			356,293			292,987			63,306			21.61	%
Other Revenue:
Development and management services		—		—		—			—			—		—		—		—		—		—			5,216			8,733			(3,517	)		(40.27	)%
Other Expenses:
General and administrative expense		—		—		—			—			—		—		—		—		—		—			29,905			45,516			(15,611	)		(34.30	)%
Transaction costs		—		—		—			—			—		—		—		—		—		—			437			443			(6	)		(1.35	)%
Impairment loss		—		—		—			—			—		—		—		—		—		—			—			8,306			(8,306	)		(100.00	)%
Depreciation and amortization		116,861		115,339		1,522			1.32	%		34,724		—		2,685		680		—		3,434			154,270			119,453			34,817			29.15	%
Total Other Expenses		116,861		115,339		1,522			1.32	%		34,724		—		2,685		680		—		3,434			184,612			173,718			10,894			6.27	%
Operating Income		180,052		174,626		5,426			3.11	%		20,777		—		1,194		852		—		(1,944	)		176,897			128,002			48,895			38.20	%
Other Income:
Income from unconsolidated joint ventures																									2,816			8,721			(5,905	)		(67.71	)%
Interest and other income																									1,311			1,471			(160	)		(10.88	)%
Gains from investments in securities																									286			735			(449	)		(61.09	)%
Other Expenses:
Interest expense																									113,554			100,433			13,121			13.06	%
Income From Continuing Operations																									67,756			38,496			29,260			76.01	%
Discontinued Operations:
Income from discontinued operations																									—			2,494			(2,494	)		(100.00	)%
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																								$	67,756		$	57,931		$	9,825			16.96	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships																									(4,354	)		(2,574	)		(1,780	)		(69.15	)%
Noncontrolling interest— redeemable preferred units of the Operating Partnership																									(619	)		(1,180	)		561			47.54	%
Noncontrolling interest—common units of the Operating Partnership																									(6,160	)		(4,111	)		(2,049	)		(49.84	)%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																									—			(2,066	)		2,066			100.00	%
Net Income Attributable to Boston Properties, Inc.																								$	56,623		$	48,000		$	8,623			17.96	%
Preferred dividends																									(2,589	)		(146	)		(2,443	)		(1,673.29	)%
Net Income Attributable to Boston Properties, Inc. Common shareholders																								$	54,034		$	47,854		$	6,180			12.91	%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 37. Residential Net Operating Income for the three months ended March 31, 2014 and 2013 are comprised of Residential Revenue of $5,451 and $5,578 less Residential Expenses of $2,980 and $2,733, respectively. Hotel Net Operating Income for the three months ended March 31, 2014 and 2013 are comprised of Hotel Revenue of $8,193 and $8,291 less Hotel Expenses of $6,797 and $7,044, 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 $16.9 million for the three months ended March 31, 2014 compared to 2013. The increase was primarily the result of an increase of approximately $16.9 million in revenue from our leases due to an increase in tenant recoveries related to higher operating expenses and increases in rental rates and occupancy. Rental revenue from our leases increased approximately $16.9 million as a result of our average revenue per square foot increasing by approximately $0.96, contributing approximately $7.9 million, and an approximately $9.0 million increase due to an increase in average occupancy from 91.4% to 93.2%.

For fiscal 2014, we expect an increase in Same Property Portfolio net operating income of approximately 1.75% to 2.5% compared to 2013.

Termination Income

Termination income increased by approximately $0.6 million for the three months ended March 31, 2014 compared to 2013.

Termination income for the three months ended March 31, 2014 related to eleven tenants across the Same Property Portfolio and totaled approximately $1.1 million, of which approximately $0.5 million was related to a negotiated settlement with a former tenant at Cambridge Center.

Termination income for the three months ended March 31, 2013 related to six tenants across the Same Property Portfolio and totaled approximately $0.5 million.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $10.4 million for the three months ended March 31, 2014 compared to 2013 due primarily to (1) an increase of approximately $3.0 million, or 4.1%, in real estate taxes, which increases primarily occurred in our Washington, DC and New York regions, (2) an increase of approximately $3.0 million, or 12.2%, in repairs and maintenance expense, which was primarily in the Boston and New York CBD buildings, (3) an approximately $1.6 million, or 5.5%, increase in utilities expense, which was primarily due to an increase in the delivery rate for steam in the Boston region, (4) an approximately $1.5 million, or 16.1%, increase in roads and grounds expense, which was primarily related to snow removal in the Washington, DC region and (5) an increase of approximately $1.3 million, or 4.4%, in other operating expenses.

Beginning in the third quarter of 2013, we 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 $1.9 million for the three months ended March 31, 2013, 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 $1.5 million, or 1.3%, for the three months ended March 31, 2014 compared to 2013.

Properties Acquired or Consolidated Portfolio

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.

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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 $79.4 million for the three months ended March 31, 2014 compared to 2013, as detailed below:

Property	Date Acquired or Consolidated	Rental Revenue for the three months ended March 31,
		2014		2013		Change
		(in thousands)
Mountain View Research Park	April 10, 2013	$	4,952	$	—	$	4,952
Mountain View Technology Park	April 10, 2013		1,118		—		1,118
767 Fifth Avenue (the General Motors Building)	May 31, 2013		73,332		—		73,332
Total		$	79,402	$	—	$	79,402

Real Estate Operating Expenses

Real estate operating expenses from our Properties Acquired or Consolidated Portfolio increased approximately $23.9 million for the three months ended March 31, 2014 compared to 2013, as detailed below:

Property	Date Acquired or Consolidated	Real Estate Operating Expenses for the three months ended March 31,
		2014		2013		Change
		(in thousands)
Mountain View Research Park	April 10, 2013	$	999	$	—	$	999
Mountain View Technology Park	April 10, 2013		176		—		176
767 Fifth Avenue (the General Motors Building)	May 31, 2013		22,726		—		22,726
Total		$	23,901	$	—	$	23,901

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Acquired or Consolidated Portfolio increased by approximately $34.7 million for the three months ended March 31, 2014 compared to 2013 as a result of the acquisition or consolidation of properties after March 31, 2013.

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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 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Properties Placed In-Service Portfolio

We placed in-service or partially placed in-service seven properties between January 1, 2013 and March 31, 2014. The square footage amount for the four properties that are fully placed in-service is approximately 1.1 million square feet. 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 $5.5 million for the three months ended March 31, 2014 compared to 2013, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Rental Revenue for the three months ended March 31,
			2014		2013		Change
			(in thousands)
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)	$	4,278	$	2,319	$	1,959
Seventeen Cambridge Center	Second Quarter, 2013	Second Quarter, 2013		2,660		—		2,660
250 West 55th Street	Third Quarter, 2013	N/A		601		—		601
The Avant at Reston Town Center (Residential)	Fourth Quarter, 2013	First Quarter, 2014		231		—		231
680 Folsom Street	Fourth Quarter, 2013	N/A		8		—		8
Total			$	7,778	$	2,319	$	5,459

Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $3.1 million for the three months ended March 31, 2014 compared to 2013, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Real Estate Operating Expenses for the three months ended March 31,
			2014		2013		Change
			(in thousands)
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)	$	1,514	$	787	$	727
Seventeen Cambridge Center	Second Quarter, 2013	Second Quarter, 2013		195		—		195
250 West 55th Street	Third Quarter, 2013	N/A		1,367		—		1,367
The Avant at Reston Town Center (Residential)	Fourth Quarter, 2013	First Quarter, 2014		782		—		782
680 Folsom Street	Fourth Quarter, 2013	N/A		41		—		41
Total			$	3,899	$	787	$	3,112

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Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio increased by approximately $2.0 million for the three months ended March 31, 2014 compared to 2013.

Properties in Development or Redevelopment Portfolio

At March 31, 2013, 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 three months ended March 31, 2013, had approximately $1.8 million of revenue and approximately $0.3 million of operating expenses. In addition, during the three months ended March 31, 2013, the building had approximately $3.4 million of depreciation and amortization expense.

Other Operating Income and Expense Items

Residential Net Operating Income

Net operating income for our residential properties decreased by approximately $0.4 million for the three months ended March 31, 2014 compared to 2013.

The following reflects our occupancy and rate information for The Lofts at Atlantic Wharf and the Residences on The Avenue for the three months ended March 31, 2014 and 2013.

	The Lofts at Atlantic Wharf									Residences on The Avenue
	2014			2013			Percentage Change			2014			2013			Percentage Change
Average Physical Occupancy(1)		96.9	%		99.6	%		(2.7	)%		92.5	%		92.7	%		(0.2	)%
Average Economic Occupancy(2)		97.7	%		99.8	%		(2.1	)%		91.8	%		92.5	%		(0.8	)%
Average Monthly Rental Rate(3)	$	3,927		$	3,781			3.9	%	$	3,182		$	3,360			(5.3	)%
Average Rental Rate Per Occupied Square Foot	$	4.37		$	4.19			4.3	%	$	3.90		$	4.12			(5.3	)%

(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 $0.1 million for the three months ended March 31, 2014 compared to 2013. We expect our hotel net operating income for fiscal 2014 to be between $13 million and $14 million.

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The following reflects our occupancy and rate information for the Cambridge Center Marriott hotel for the three months ended March 31, 2014 and 2013.

	2014			2013			Percentage Change
Occupancy		77.7	%		73.5	%		5.7	%
Average daily rate	$	199.88		$	194.79			2.6	%
Revenue per available room, REVPAR	$	155.78		$	143.17			8.8	%

Development and Management Services

Development and management services income decreased approximately $3.5 million for the three months ended March 31, 2014 compared to 2013. The decrease was due to decreases in development fee and management fee income of approximately $1.8 million and $1.7 million, respectively. The decrease in development fees is primarily due to a decrease in fees associated with tenant improvement project management. The decrease in management fees is due primarily to a decrease in management fees earned from our joint ventures primarily due to the consolidation of 767 Fifth Avenue (the General Motors Building), the acquisition of the Mountain View assets and the sale of 125 West 55th Street in New York City. We expect fee income for fiscal 2014 to be between $19 million and $22 million. Our 2014 estimates are less than 2013 due to the conclusion of several fee development projects in Washington, DC and Boston, as well as the consolidation of 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 decreased approximately $15.6 million for the three months ended March 31, 2014 compared to 2013 due primarily to the Transition Benefits Agreement that we entered into with Mortimer B. Zuckerman in 2013. On March 11, 2013, we announced that Owen D. Thomas would succeed Mr. 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 the 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 $6.6 million of compensation expense during the three months ended March 31, 2013 and approximately $2.0 million of compensation expense during the three months ended March 31, 2014. We expect to recognize the remaining compensation expense over the remaining vesting period and, accordingly, expect to expense approximately $2.0 million in the second quarter of 2014. Due to the Transition Benefits Agreement, during the three months ended March 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. In addition, the value of our deferred compensation plan and other general and administrative expenses, which includes compensation expense decreased by approximately $0.5 million and $0.5 million, respectively. These decreases were partially offset by the following increases: (1) approximately $0.9 million related to the issuance of the 2014 MYLTIP Units, (2) approximately $1.2 million related to the termination of the 2011 OPP Awards (refer to Note 10 to the Consolidated Financial Statements), (3) approximately $0.5 million in taxes and (4) approximately $0.3 million in health care costs.

Beginning in the third quarter of 2013, we 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

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consistent presentation across our company. These expenses, which totaled approximately $1.9 million for the three months ended March 31, 2013, 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.

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 three months ended March 31, 2014 and 2013 were approximately $3.5 million and $2.8 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

During the three months ended March 31, 2014, we incurred approximately $0.4 million of transaction costs, which related to several properties that we are marketing for potential sale and legal fees associated with the formation of joint ventures. During the three months ended March 31, 2013, we incurred approximately $0.4 million of transaction costs related to Salesforce Tower (formerly Transbay Tower) in San Francisco, California,

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 estimated fair market value and we recognized an impairment loss of approximately $8.3 million during the three months ended March 31, 2013. We did not recognize any impairment losses during the three months ended March 31, 2014.

Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the three months ended March 31, 2014 compared to 2013, income from unconsolidated joint ventures decreased by approximately $5.9 million due primarily to (1) an approximately $4.8 million decrease in our share of net income from 767 Fifth Avenue (the General Motors Building) related to its consolidation on June 1, 2013, (2) an approximately $0.4 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 and (3) an approximately $1.3 million decrease in our share of net income from 125 West 55th Avenue due to its sale on May 30, 2013. These decreases were partially offset by an approximately $0.6 million increase in our share of net income from our other unconsolidated joint ventures, which was primarily related to increased leasing and occupancy at 540 Madison Avenue in New York City.

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 or Consolidated Portfolio” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Gains from Investments in Securities

Gains from investments in securities for the three months ended March 31, 2014 and 2013 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

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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 three months ended March 31, 2014 and 2013, we recognized gains of approximately $0.3 million and $0.7 million, respectively, on these investments. By comparison, our general and administrative expense increased by approximately $0.3 million and $0.8 million during the three months ended March 31, 2014 and 2013, 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.

Interest Expense

Interest expense increased approximately $13.1 million for the three months ended March 31, 2014 compared to 2013 as detailed below:

Component	Change in interest expense for the three months ended March 31, 2014 compared to March 31, 2013
	(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)	$	12,811
Partner’s share of the interest for the outstanding Outside Members’ Notes Payable for 767 Fifth Avenue (the General Motors Building)		6,940
Issuance of $700 million in aggregate principal of our Operating Partnership’s 3.800% senior notes due 2024 on June 27, 2013		6,692
Issuance of $500 million in aggregate principal of our Operating Partnership’s 3.125% senior notes due 2023 on April 11, 2013		3,971
Total increases to interest expense	$	30,414
Decreases to interest expense due to:
Interest expense associated with the adjustment for the equity component allocation of our unsecured exchangeable debt	$	(4,719	)
Repurchases/redemption/exchange of $450.0 million in aggregate principal of our Operating Partnership’s 3.75% exchangeable senior notes due 2036		(4,219	)
Repayment of $747.5 million in aggregate principal of our Operating Partnership’s 3.625% exchangeable senior notes due 2014		(3,854	)
Increase in capitalized interest		(3,290	)
Repayment of mortgage financings		(774	)
Other interest expense (excluding senior notes)		(437	)
Total decreases to interest expense	$	(17,293	)
Total change in interest expense	$	13,121

The following properties are included in the repayment of mortgage financings line item: 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 three months ended March 31, 2014 and 2013 was approximately $17.7 million and $14.4 million, respectively. These costs are not included in the interest expense referenced above.

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We anticipate net interest expense for 2014 will be approximately $446 million to $450 million. This estimate assumes approximately $52 million to $56 million of capitalized interest and the repayment of a $63.0 million mortgage secured by New Dominion Tech. Park Building Two 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 March 31, 2014, our variable rate debt consisted of our Operating Partnership’s $1.0 billion Unsecured Line of Credit. For a summary of our consolidated debt as of March 31, 2014 and March 31, 2013 refer to the heading “Liquidity and Capital Resources—Capitalization—Debt Financing” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Discontinued Operations

On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity” (“ASU No. 2014-08”). ASU No. 2014-08 clarifies that discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). ASU No. 2014-08 is effective prospectively for reporting periods beginning after December 15, 2014. Early adoption is permitted, and we early adopted ASU No. 2014-08 during the first quarter of 2014. Our adoption of ASU No. 2014-08 did not have a material impact on our consolidated financial statements.

Prior to the adoption of ASU No. 2014-08, we had the following properties that were considered discontinued operations for the three months ended March 31, 2013: 10 & 20 Burlington Mall Road, One Preserve Parkway, 1301 New York Avenue, 303 Almaden Boulevard and Montvale Center. Each of these dispositions is discussed below.

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. 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. 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. 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

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three months ended March 31, 2013. As a result, there was no loss on sale of real estate recognized. 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 first quarter of 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.

Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships increased by approximately $1.8 million for the three months ended March 31, 2014 compared to 2013 as detailed below.

Property	Date of Consolidation	Partners’ noncontrolling interest for the three months ended March 31,
		2014			2013		Change
		(in thousands)
505 9th Street	October 1, 2007	$	575		$	566	$	9
Fountain Square	October 4, 2012		1,768			2,008		(240	)
767 Fifth Avenue (the General Motors Building)	May 31, 2013		(4,644	)		—		(4,644	)
Times Square Tower	October 9, 2013		6,655			—		6,655
		$	4,354		$	2,574	$	1,780

The decrease at 767 Fifth Avenue (the General Motors Building) was primarily due to the partners’ share of the interest expense for the outside members’ notes payable.

Noncontrolling interest—Common Units of the Operating Partnership

Noncontrolling interest-common units of the Operating Partnership increased by approximately $2.0 million for the three months ended March 31, 2014 compared to 2013 due to an increase in allocable income partially offset by 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;

• redeem our Operating Partnership’s Series Four Preferred Units;

• 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 or ownership interests in our assets.

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 may 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 March 31, 2014 (dollars in thousands):

Construction Properties	Estimated Stabilization Date	Location	# of Buildings		Estimated Square Feet		Investment to Date(1)		Estimated  Total Investment(1)		Percentage Leased(2)
Office
680 Folsom Street(3)	Fourth Quarter, 2014	San Francisco, CA		2		524,509	$	305,313	$	340,000		96	%
Annapolis Junction Building Seven (50% ownership)(4)	First Quarter, 2015	Annapolis, MD		1		125,000		11,796		17,500		100	%
250 West 55th Street(5)	Fourth Quarter, 2015	New York, NY		1		989,000		868,268		1,050,000		73	%
804 Carnegie Center	First Quarter, 2016	Princeton, NJ		1		130,000		2,234		40,410		100	%
535 Mission Street	Third Quarter, 2016	San Francisco, CA		1		307,000		135,348		215,000		26	%
601 Massachusetts Avenue	Fourth Quarter, 2017	Washington, DC		1		478,000		171,232		360,760		80	%
Salesforce Tower (95% Ownership)(6)	First Quarter, 2019	San Francisco, CA		1		1,400,000		264,788		1,130,000		51	%
Total Properties under Construction				8		3,953,509	$	1,758,979	$	3,153,670		67	%

(1) Represents our share. Includes net revenue during lease up period, acquisition expenses and approximately $60.9 million of construction cost and leasing commission accruals.

(2) Represents percentage leased as of May 5, 2014, includes leases with future commencement dates.

(3) As of March 31, 2014, this project was 1% placed in-service.

(4) This development project has a construction loan.

(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 March 31, 2014, this property was 6% placed in-service.

(6) On April 11, 2014, the joint venture executed a lease for 714,000 square feet of this 61-story, 1.4 million square foot Class A office tower. This project was (formerly Transbay Tower). The Estimated Total investment has been updated to represent the total cost to complete the project.

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

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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.

The completion of our ongoing developments, through 2018, have remaining costs to fund of approximately $1.4 billion. We have approximately $77 million of secured debt (of which our share is approximately $70 million) expiring through the end of 2014. In addition, our Operating Partnership anticipates that it will redeem the remaining 360,126 Series Four Preferred Units at a redemption price of $50.00 per unit plus accrued and unpaid distributions. We believe that our strong liquidity, including available cash as of May 5, 2014 of approximately $0.9 billion, the approximately $990 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. We expect to establish a new at-the-market equity offering program upon the expiration of our existing program in June 2014. 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 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 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. 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 taxable 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

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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 $1.2 billion and $0.9 billion at March 31, 2014 and 2013, respectively, representing a increase of approximately $0.3 billion. The following table sets forth changes in cash flows:

	Three months ended March 31,
	2014			2013			Increase (Decrease)
	(in thousands)
Net cash provided by operating activities	$	124,209		$	237,429		$	(113,220	)
Net cash used in investing activities		(147,072	)		(432,991	)		285,919
Net cash provided by (used in) financing activities		(1,162,701	)		62,960			(1,225,661	)

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.

For the three months ended March 31, 2014, our total dividends payments exceeded our cash flow from operating activities due to the special dividend which was declared in December 2013 and paid to common stockholders and common unitholders of our Operating Partnership in January 2014. The cash flows distributed were primarily a result of the sale of a 45% interest in our Times Square Tower property in October 2013 which was included as part of cash flows provided by financing activities. Dividends will generally exceed cash flows from operating activities during periods in which we sell significant real estate assets and distribute gains on sale that would otherwise be taxable. In addition, the payment of a special dividend may not occur in the same period as the asset sale.

Our cash flows provided by operating activities for the three months ended March 31, 2014, were lower than 2013 due to the settlement of approximately $93.0 million of accreted debt discount on our Operating Partnership’s repurchase of $747.5 million of exchangeable senior notes.

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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 three months ended March 31, 2014 and 2013 consisted primarily of funding our development projects and the acquisitions of 535 Mission Street and the Salesforce Tower (formerly Transbay Tower) and Reston, Virginia land parcels, as detailed below:

	Three months ended March 31,
	2014			2013
	(in thousands)
Acquisitions of real estate	$	—		$	(289,816	)
Construction in progress		(97,025	)		(103,178	)
Building and other capital improvements		(17,510	)		(14,162	)
Tenant improvements		(31,551	)		(24,988	)
Repayments of notes receivable, net		—			184
Capital contributions to unconsolidated joint ventures		—			(113	)
Capital distributions from unconsolidated joint ventures		113			—
Investments in securities, net		(1,099	)		(918	)
Net cash used in investing activities	$	(147,072	)	$	(432,991	)

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

• 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 61-story, 1.4 million square foot Class A office tower known as Salesforce Tower (formerly 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.

• Construction in progress for the three months ended March 31, 2013 includes expenditures associated with our continued development and redevelopment of Seventeen Cambridge Center, The Avant at Reston Town Center, the Cambridge Center Connector, 250 West 55th Street, 680 Folsom Street, 535 Mission Street and expenditures associated with Two Patriots Park, which was fully placed in-service on March 22, 2013. Construction in progress for the three months ended March 31, 2014 includes ongoing expenditures associated with The Avant at Reston Town Center, 250 West 55th Street and 680 Folsom Street which were fully or partially placed in-service during the three months ended March 31, 2014. In addition, we incurred costs associated with our continued development of 535 Mission Street, 601 Massachusetts Avenue, 804 Carnegie Center and Salesforce Tower (formerly Transbay Tower).

• Our capital expenditures for the three months ended March 31, 2014 and 2013 were approximately $12.6 million and $7.8 million, respectively. Included in our 2014 amount is approximately $2.9 million of non-recurring capital expenditures related to the repositioning of Bay Colony Corporate Center in Waltham, Massachusetts and expenditures at our Boston CBD buildings.

• Tenant improvement costs increased by approximately $6.6 million due to the commencement of tenant projects in 2014.

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Cash used in financing activities for the three months ended March 31, 2014 totaled approximately $1.2 billion. This consisted primarily of the repayment at maturity of $747.5 million of 3.625% exchangeable senior notes due 2014 and the payments of regular and special dividends and distributions to our shareholders and the unitholders. Future debt payments are discussed below under the heading “Capitalization-Debt Financing.”

Capitalization

At March 31, 2014, our total consolidated debt was approximately $10.6 billion. The GAAP weighted-average annual interest rate on our consolidated indebtedness was 4.46% (with a coupon/stated rate of 5.01%) and the weighted-average maturity was approximately 5.5 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 $30.4 billion at March 31, 2014. Our total consolidated market capitalization was calculated using the March 31, 2014 closing stock price of $114.53 per common share and the following: (1) 153,017,311 shares of our common stock, (2) 15,583,853 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 1,554,353 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 $10.6 billion. At March 31, 2014, our total consolidated debt, which excludes debt collateralized by our unconsolidated joint ventures represented approximately 34.81% 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 $10.0 billion at March 31, 2014. 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. At March 31, 2014 our total adjusted debt represented approximately 33.61% of our total adjusted market capitalization.

The calculation of total consolidated and adjusted market capitalization does not include 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units and 483,555 2014 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.

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For a discussion of our unconsolidated joint venture indebtedness, see “Liquidity and Capital Resources—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Debt Financing

As of March 31, 2014, we had approximately $10.6 billion of outstanding consolidated indebtedness, representing approximately 34.81% 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 having a weighted-average interest rate of 4.44% per annum and maturities in 2015, 2018, 2019, 2020, 2021, 2023 and 2024; (2) $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 3.9 years and (3) $0.3 billion 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 Operating Partnership’s Unsecured Line of Credit at March 31, 2014 and March 31, 2013:

	March 31,
	2014			2013
	(Dollars in Thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable	$	4,430,110		$	3,053,798
Unsecured senior notes, net of discount		5,836,290			4,639,843
Unsecured exchangeable senior notes, net of discount and adjustment for the equity component allocation		—			1,177,877
Unsecured Line of Credit		—			—
Mezzanine notes payable		310,735			—
Total	$	10,577,135		$	8,871,518
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		4.46	%		5.12	%
Variable rate		—	%		—	%
Total		4.46	%		5.12	%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate		5.01	%		4.87	%
Variable rate		—	%		—	%
Total		5.01	%		4.87	%

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

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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 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 March 31, 2014, we had no borrowings and outstanding letters of credit totaling approximately $9.9 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $990.1 million. As of May 5, 2014, we had no borrowings and outstanding letters of credit totaling approximately $9.9 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $990.1 million.

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of March 31, 2014 (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								(13,710	)
Total							$	5,836,290

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(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.

Our unsecured senior notes are redeemable at our option, in whole or in part, at a redemption price equal to the greater of (i) 100% of their principal amount or (ii) 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 March 31, 2014, we believe we were in compliance with each of these financial restrictions and requirements.

Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at March 31, 2014:

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	$	152,724	$	1,452,724	(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	%		719,473		—		719,473		April 10, 2022
John Hancock Tower		5.68	%		5.05	%		640,500		11,495		651,995	(4)(6)	January 6, 2017
Embarcadero Center Four		6.10	%		7.02	%		358,800		—		358,800	(7)	December 1, 2016
Fountain Square		5.71	%		2.56	%		211,250		13,752		225,002	(4)(8)	October 11, 2016
505 9th Street		5.73	%		5.87	%		120,762		—		120,762	(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	%		42,147		—		42,147		January 15, 2021
Kingstowne Two and Retail		5.99	%		5.61	%		32,618		239		32,857		January 1, 2016
University Place		6.94	%		6.99	%		13,350		—		13,350		August 1, 2021
Total							$	4,251,900	$	178,210	$	4,430,110

(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 March 31, 2014, the maximum funding obligation under the guarantee was approximately $11.7 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.

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(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 $21.4 million related to our obligation to provide funds for certain tenant re-leasing costs.

(7) 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.

Mezzanine Notes Payable

The following represents the outstanding principal balances due under the mezzanine notes payable at March 31, 2014:

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	$	4,735	$	310,735	(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 partner loans bear interest at a fixed rate of 11.0% per annum and mature on June 9, 2017. We have eliminated in consolidation our partner loan totaling $270.0 million and our share of the related accrued interest payable of approximately $116.0 million at March 31, 2014. The remaining notes payable to the outside joint venture partners and related accrued interest payable totaling $180.0 million and approximately $77.3 million as of March 31, 2014 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 $6.9 million for the three months ended March 31, 2014 is fully allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations.

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 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 4 to the Consolidated Financial Statements. At March 31, 2014, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $748.7 million (of which our proportionate share is approximately $328.9 million). The table below summarizes the outstanding

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debt of these joint venture properties at March 31, 2014. 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)			Carrying Amount			Maturity Date
	(Dollars in thousands)
540 Madison Avenue		60	%		1.66	%		1.83	%	$	120,000	(2)(3)	June 5, 2018
Metropolitan Square		51	%		5.75	%		5.81	%		173,133		May 5, 2020
Market Square North		50	%		4.85	%		4.91	%		129,191		October 1, 2020
Annapolis Junction Building One		50	%		1.91	%		2.07	%		41,133	(4)	March 31, 2018
Annapolis Junction Building Six		50	%		1.81	%		2.00	%		13,982	(2)(5)	November 17, 2014
Annapolis Junction Building Seven		50	%		1.82	%		2.38	%		13,415	(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	%		152,846		January 1, 2015
Total										$	748,700

(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 one, one-year extension options, 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 options, subject to certain conditions.

State and Local Tax Matters

Because we are organized and qualify as a REIT, we are generally not subject to federal income taxes, but 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 or other inquiries. 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.

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 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

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$1.0 billion of Terrorism Coverage in our property insurance program. 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 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) our $1.0 billion portfolio property insurance program and the $250 million of additional Terrorism Coverage for 601 Lexington Avenue will continue to provide Terrorism Coverage through the expiration of the program on March 1, 2015, (ii) we will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (iii) 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, (iv) we may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (v) we may not be able to obtain future debt financings secured by individual properties and (vi) we may cancel the insurance policies issued by IXP for the NBCR Coverage 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, 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 Salesforce Tower (formerly 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 Salesforce Tower (formerly Transbay Tower) in San Francisco includes a $15 million per occurrence and annual aggregate limit of earthquake coverage. We are evaluating purchasing additional earthquake insurance limits upon the commencement of the vertical construction of Salesforce Tower (formerly Transbay Tower). 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 and our NBCR Coverage. 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

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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.

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. common shareholders (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.

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FFO should not be considered as an alternative to net income attributable to Boston Properties, Inc. common shareholders (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.

The following table presents a reconciliation of net income attributable to Boston Properties, Inc. common shareholders to FFO for the three months ended March 31, 2014 and 2013:

	Three months ended March 31,
	2014			2013
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	54,034		$	47,854
Add:
Preferred dividends		2,589			146
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		—			2,066
Noncontrolling interest—common units of the Operating Partnership		6,160			4,111
Noncontrolling interest—redeemable preferred units of the Operating Partnership		619			1,180
Noncontrolling interests in property partnerships		4,354			2,574
Impairment loss from discontinued operations		—			3,241
Less:
Income from discontinued operations		—			2,494
Gain on forgiveness of debt from discontinued operations		—			20,182
Income from continuing operations		67,756			38,496
Add:
Real estate depreciation and amortization(1)		158,514			142,555
Income from discontinued operations		—			2,494
Less:
Noncontrolling interests in property partnerships’ share of funds from operations		19,023			3,038
Noncontrolling interest—redeemable preferred units of the Operating Partnership		619			1,180
Preferred distributions		2,589			146
Funds from operations attributable to the Operating Partnership	$	204,039		$	179,181
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations		20,195			18,557
Funds from Operations attributable to Boston Properties, Inc.	$	183,844		$	160,624
Boston Properties, Inc.’s percentage share of Funds from Operations—basic		90.10	%		89.86	%
Weighted-average shares outstanding—basic		153,030			151,646

(1) Real estate depreciation and amortization consists of depreciation and amortization from the Consolidated Statements of Operations of $154,270 and $119,453, our share of unconsolidated joint venture real estate depreciation and amortization of $4,584 and $21,657 and depreciation and amortization from discontinued operations of $0 and $1,738, less corporate related depreciation and amortization of $340 and $293 for the three months ended March 31, 2014 and 2013, respectively.

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Reconciliation to Diluted Funds from Operations:

	Three Months Ended March 31, 2014				Three Months Ended March 31, 2013
	Income (Numerator)		Shares (Denominator)		Income (Numerator)		Shares (Denominator)
	(in thousands)
Basic FFO	$	204,039		169,841	$	179,181		168,750
Effect of Dilutive Securities
Convertible Preferred Units		530		874		879		1,307
Stock Based Compensation and Exchangeable Senior Notes		—		139		—		306
Diluted FFO	$	204,569		170,854	$	180,060		170,363
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted FFO		20,128		16,811		18,077		17,104
Boston Properties, Inc.’s share of Diluted FFO(1)	$	184,441		154,043	$	161,983		153,259

(1) Our share of diluted Funds from Operations was 90.16% and 89.96% for the quarter ended March 31, 2014 and 2013, respectively.

Contractual Obligations

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 include terms that provide for cancellation with insignificant or no cancellation penalties. Contract terms are generally between three and five years.

During the first quarter of 2014, we paid approximately $48.1 million to fund tenant-related obligations, including tenant improvements and leasing commissions, and incurred approximately $48.3 million of new tenant-related obligations associated with approximately 1.4 million square feet of second generation leases, or approximately $34 per square foot. In addition, we signed leases for approximately 160,000 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 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.” In the aggregate, during the first quarter of 2014, we signed leases for approximately 1.6 million square feet of space and incurred aggregate tenant-related obligations of approximately $65.3 million, or approximately $42 per square foot.

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ITEM 3—Quantitative and Qualitative Disclosures about Market Risk.

As of March 31, 2014, approximately $10.6 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 4 to the Consolidated Financial Statements and “Item 2—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	$	120,627		$	80,070		$	659,511		$	2,855,942		$	18,633		$	695,327		$	4,430,110		$	4,577,435
Average Interest Rate		5.63	%		5.48	%		5.29	%		3.90	%		3.89	%		4.59	%		4.31	%
Variable Rate		—			—			—			—			—			—			—			—
	Mezzanine debt
Fixed Rate	$	939		$	1,314		$	1,389		$	307,093		$	—		$	—		$	310,735		$	310,764
Average Interest Rate		—			—			—			5.53	%		—			—			5.53	%
Variable Rate		—			—			—			—			—			—			—			—
	Unsecured debt
Fixed Rate	$	(1,372	)	$	548,314		$	(1,681	)	$	(1,749	)	$	848,226		$	4,444,552		$	5,836,290		$	6,145,060
Average Interest Rate		—			5.47	%		—			—			3.85	%		4.53	%		4.52	%
Variable Rate		—			—			—			—			—			—			—			—
Total Debt	$	120,194		$	629,698		$	659,219		$	3,161,286		$	866,859		$	5,139,879		$	10,577,135		$	11,033,259

At March 31, 2014, the weighted-average coupon/stated rates on our fixed rate debt was 5.01% per annum. The weighted-average coupon/stated rates for our unsecured debt was 4.44% per annum.

At March 31, 2014, we had no outstanding variable rate debt.

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.

ITEM 4—Controls and Procedures.

(a) Evaluation of Disclosure Controls and Procedures. As of the end of the period covered by this report, our management, with the participation of our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer), evaluated 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.

(b) Changes in Internal Control Over Financial Reporting. 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 first quarter of our fiscal year ending December 31, 2014 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1—Legal Proceedings.

We are subject to 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 1A—Risk Factors.

Except to the extent updated below or previously updated or to the extent additional factual information disclosed elsewhere in this Quarterly Report on Form 10-Q relates to such risk factors (including, without limitation, the matters discussed in Part I, “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations”), there were no material changes to the risk factors disclosed in Part I, “Item 1A. Risk Factors” of our Annual Report on Form 10-K for the year ended December  31, 2013.

ITEM 2—Unregistered Sales of Equity Securities and Use of Proceeds

(a) During the three months ended March 31, 2014, we issued an aggregate of 18,528 common shares in exchange for 18,528 common units of limited partnership held by certain limited partners of BPLP. Of these shares, 1,219 shares 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 partner who received the common shares.

(b) Not applicable.

(c) Issuer Purchases of Equity Securities.

Period	(a) Total Number of Shares of Common Stock Purchased			(b) Average Price Paid per Common Share		(c) Total Number  of Shares Purchased as Part of Publicly Announced Plans or Programs		(d) Maximum Number (or Approximate Dollar Value) of Shares that May Yet be Purchased
January 1, 2014—January 31, 2014		8,896	(1)	$	105.38		N/A		N/A
February 1, 2014—February 28, 2014		—			—		N/A		N/A
March 1, 2014—March 31, 2014		439	(2)	$	0.01		N/A		N/A
Total		9,335		$	105.12		N/A		N/A

(1) Represents shares of Common Stock surrendered by employees to the Company to satisfy such employees’ tax withholding obligations in connection with the vesting of restricted common stock.

(2) Represents shares of restricted common stock repurchased in connection with the termination of an employee’s employment with the Company. Under the terms of the applicable restricted stock award agreement, such shares were repurchased by us at a price of and $0.01 per share, which was the amount originally paid by such employee for such shares.

ITEM 3—Defaults Upon Senior Securities.

None.

ITEM 4—Mine Safety Disclosures.

None.

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PART II. OTHER INFORMATION

ITEM 5—Other Information.

(a) None.

(b) None.

ITEM 6—Exhibits.

(a) Exhibits

12.1	—	Calculation of Ratios of Earnings to Fixed Charges and Calculation of Ratios of Earnings to Combined Fixed Charges and Preferred Dividends.
31.1	—	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	—	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	—	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes Oxley Act of 2002.
32.2	—	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes Oxley Act of 2002.
101	—	The following materials from Boston Properties, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2014 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.

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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.
May 9, 2014		/s/    MICHAEL E. LABELLE
		Michael E. LaBelle
		Chief Financial Officer
		(duly authorized officer and
		principal financial officer)

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 three months ended March 31, 2014 and the five years ended December 31, 2013 were as follows:

	Three Months Ended March 31, 2014			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	$	64,940		$	242,583		$	236,378		$	217,054		$	140,698		$	246,723
Gains on sales of real estate		—			—			—			—			2,734			11,760
Amortization of interest capitalized		1,445			5,522			5,278			4,188			2,660			2,498
Distributions from unconsolidated joint ventures		1,431			17,600			20,565			22,451			10,733			6,676
Fixed charges (see below)		133,544			528,116			469,083			449,972			423,224			376,059
Subtract:
Interest capitalized		(17,709	)		(68,152	)		(44,278	)		(48,178	)		(40,981	)		(48,816	)
Preferred distributions of consolidated subsidiaries		(619	)		(6,046	)		(3,497	)		(3,339	)		(3,343	)		(3,594	)
Noncontrolling interest in income of a subsidiary that has not incurred fixed charges		(6,655	)		(5,818	)		—			—			—			—
Total earnings	$	176,377		$	713,805		$	683,529		$	642,148		$	535,725		$	591,306
Fixed charges:
Interest expensed	$	113,554		$	447,240		$	413,564		$	394,131		$	378,079		$	322,833
Interest capitalized		17,709			68,152			44,278			48,178			40,981			48,816
Portion of rental expense representative of the interest factor		1,662			6,678			7,744			4,324			821			816
Preferred distributions of consolidated subsidiaries		619			6,046			3,497			3,339			3,343			3,594
Total fixed charges	$	133,544		$	528,116		$	469,083		$	449,972		$	423,224		$	376,059
Preferred dividends		2,589			8,057			—			—			—			—
Total combined fixed charges and preferred dividends	$	136,133		$	536,173		$	469,083		$	449,972		$	423,224		$	376,059
Ratio of earnings to fixed charges		1.32			1.35			1.46			1.43			1.27			1.57
Ratio of earnings to combined fixed charges and preferred dividends		1.30			1.33			1.46			1.43			1.27			1.57

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Owen D. Thomas, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q 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: May 9, 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 Quarterly Report on Form 10-Q 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: May 9, 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 Quarterly Report on Form 10-Q for the period ended March 31, 2014 (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: May 9, 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 Quarterly Report on Form 10-Q for the period ended March 31, 2014 (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: May 9, 2014

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle

Chief Financial Officer

XML

Noncontrolling Interests (Redeemable Preferred Units) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance	$ 51,312
Net Income	619	1,180
Ending Balance	51,312
Redeemable Preferred Units [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance	51,312	110,876
Net Income	619	1,180
Distributions	(619)	(1,180)
Ending Balance	$ 51,312	$ 110,876

XML

Segment Information Segment Information (narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			0 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Princeton [Member]	Mar. 31, 2013 San Francisco [Member]	May 31, 2013 767 Fifth Avenue (The GM Building) [Member] partners
Segment Reporting Information [Line Items]
Reclassification between General and administrative expense and real estate operating expenses	$ 1.9	$ 0.4	$ 1.5
Number of Joint Venture Partners				2

XML

Stock Option and Incentive Plan (Restricted Stock) (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	153,096,211		153,062,001
Stock based Compensation Expense	$ 9,900,000	$ 25,500,000
Value of shares of common stock	1,530,000		1,530,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	21,455
Employee and director payment per share (in dollars per share)	$ 0.01
Value of shares of common stock	2,300,000
Employee's weighted average cost per share (in dollars per share)	$ 108.09
LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units issued (in shares)	121,567
Value of LTIP units issued	12,200,000
Per unit fair value weighted-average (in dollars per share)	$ 100.16
Expected life assumed to calculate per unit fair value per LTIP unit (years)	5 years 8 months 12 days
Risk-free rate	1.84%
Expected price volatility	27.00%
OPP Units 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated Compensation Expenses Related To two thousand eleven Opp Units	1,200,000
MYLTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
MYLTIP units issued (in shares)	485,459
LTIPs And Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting annual installments	4
Unrecognized compensation expenses	24,900,000
LTIPs and OPP Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and director payment per share (in dollars per share)	$ 0.25
Unvested 2011 and 2012 OPP Units and 2013 MYLTIPS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses	20,600,000
Weighted-average period (years)	3 years 3 months 18 days
Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based Compensation Expense		$ 16,900,000

XML

Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Real estate and development in process, net	$ 15,860,776		$ 15,817,194
Mortgage and notes payable	4,430,110		4,449,734
Other liabilities	556,772		578,969
Total liabilities and equity	18,979,568		20,162,251
Carrying value of the Company's investments in unconsolidated joint ventures	127,356		126,084
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Real estate and development in process, net	921,524		924,297
Other assets	158,375		163,149
Total assets	1,079,899		1,087,446
Mortgage and notes payable	748,700		749,732
Other liabilities	19,593		28,830
Members'/Partners' equity	311,606		308,884
Total liabilities and equity	1,079,899		1,087,446
Company's share of equity	155,807		154,726
Basis differentials	(28,451)	[1]	(28,642)	[1]
Carrying value of the Company's investments in unconsolidated joint ventures	$ 127,356		$ 126,084

[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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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Share

	For the three months ended March 31, 2014
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	54,034	153,030	$	0.35
Effect of Dilutive Securities:
Stock Based Compensation	—		139	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	54,034	153,169	$	0.35
	For the three months ended March 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.	$	30,485	151,646	$	0.20
Discontinued operations attributable to Boston Properties, Inc.	17,369		—	0.12
Net income attributable to Boston Properties, Inc. common shareholders	$	47,854	151,646	$	0.32
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—		306	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	47,854	151,952	$	0.31

XML

Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Operating Income	$ 176,897	$ 128,002
Development and management services income	5,216	8,733
Income from unconsolidated joint ventures	2,816	8,721
Interest and other income	1,311	1,471
Gains from investments in securities	286	735
Gain on forgiveness of debt from discontinued operations	0	20,182
General and administrative expense	29,905	45,516
Transaction costs	437	443
Depreciation and amortization expense	154,270	119,453
Interest expense	113,554	100,433
Impairment loss	0	8,306
Impairment loss from discontinued operations	0	3,241
Noncontrolling interest in property partnerships	4,354	2,574
Noncontrolling interest-redeemable preferred units of the Operating Partnership	619	1,180
Noncontrolling interest-common units of the Operating Partnership	6,160	4,111
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	0	2,066
Net income attributable to Boston Properties, Inc.	56,623	48,000
Business Intersegment, Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Operating Income	356,293	292,987
Development and management services income	5,216	8,733
Income from unconsolidated joint ventures	2,816	8,721
Interest and other income	1,311	1,471
Gains from investments in securities	286	735
Income from discontinued operations	0	2,494
Gain on forgiveness of debt from discontinued operations	0	20,182
General and administrative expense	29,905	45,516
Transaction costs	437	443
Depreciation and amortization expense	154,270	119,453
Interest expense	113,554	100,433
Impairment loss	0	8,306
Impairment loss from discontinued operations	0	3,241
Noncontrolling interest in property partnerships	4,354	2,574
Noncontrolling interest-redeemable preferred units of the Operating Partnership	619	1,180
Noncontrolling interest-common units of the Operating Partnership	6,160	4,111
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	0	2,066
Net income attributable to Boston Properties, Inc.	$ 56,623	$ 48,000

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Noncontrolling Interests Noncontrolling Redeemable Property Partnerships (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Noncontrolling Interest Redeemable Property Partnership [Abstract]
Beginning Balance	$ 99,609	$ 97,558
Net Loss for Redeemable interest in Property Partnership	(106)	(525)
Distributions on Redeemable Property Partnership	(1,050)	(1,350)
Adjustment to Reflect Redeemable Interest at Redemption Value	1,874	2,533
Ending Balance	$ 100,327	$ 98,216

XML

Noncontrolling Interests (Narrative) (Details)	Mar. 31, 2014
Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Operating Partnership (OP) Units (in shares)	15,583,853
Long-Term Incentive Plan (LTIP) Units (in shares)	1,554,353
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 2012 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units (in shares)	394,590
MYLTIP [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
2013 MYLTIP	314,974
MYLTIP 2014 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Two thousand fourteen MYLTIP	483,555

XML

Stock Option and Incentive Plan Stock Option and Incentive Plan (Narrative) (Details) (MYLTIP 2014 [Member], USD $)	0 Months Ended
	Jan. 27, 2014 indices tiers Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TRS Measurement, Years	3
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%
Distributions Percent Before Measurement Date	10.00%
Value of MYLTIP Awards	$ 12,700,000
MYLTIP Value Amortized Into Earnings, Years	4
Cohen & Steers Realty Majors Portfolio Index [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Percentage of Index Used to Compare to TRS	50.00%
NAREIT Office Index adjusted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Percentage of Index Used to Compare to TRS	50.00%
Exceptional [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Each Tier	40,200,000
Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Each Tier	13,400,000
Threshold [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Each Tier	6,700,000
High [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Each Tier	26,800,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential Awards Earned	40,200,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential Awards Earned	$ 0
MYLTIP Vesting 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Percentage	50.00%
Vesting Date	Feb. 03, 2017
MYLTIP vesting 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Percentage	50.00%
Vesting Date	Feb. 03, 2018

XML

Basis Of Presentation And Summary Of Significant Accounting Policies

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Basis Of Presentation And Summary Of Significant Accounting Policies

Basis of Presentation and Summary of Significant Accounting Policies

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., generally executes all significant business relationships other than transactions involving securities of Boston Properties, Inc. 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.

The accompanying interim financial statements are unaudited; however, the financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and in conjunction with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the disclosures required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments (consisting solely of normal recurring matters) necessary for a fair statement of the financial statements for these interim periods have been included. The results of operations for the interim periods are not necessarily indicative of the results to be obtained for other interim periods or for the full fiscal year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosure required by accounting principles generally accepted in the United States of America. These financial statements should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report in the Company’s Form 10-K for its fiscal year ended December 31, 2013. Certain prior year amounts have been reclassified to conform to the current year presentation. In the third quarter of 2013, the Company 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 $1.9 million for the three months ended March 31, 2013 were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses. In addition, beginning on January 1 2014, the properties that were historically part of the Company's Princeton region are reflected as the suburban component of the Company's New York region (See Note 11).

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 are 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 (as defined in the accounting standards for Fair Value Measurements and Disclosures) 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 March 31, 2014 and December 31, 2013 (in thousands):

	March 31, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,430,110	$	4,577,435	$	4,449,734		$	4,545,283
Mezzanine notes payable	310,735		310,764		311,040			311,064
Unsecured senior notes	5,836,290		6,145,060		5,835,854			6,050,517
Unsecured exchangeable senior notes	—		—		744,880		(1)	750,266
Total	$	10,577,135	$	11,033,259	$	11,341,508		$	11,657,130

 _______________

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million at December 31, 2013.

Recent Accounting Pronouncements

On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" (“ASU No. 2014-08”). ASU No. 2014-08 clarifies that discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). ASU No. 2014-08 is effective prospectively for reporting periods beginning after December 15, 2014. Early adoption is permitted, and the Company early adopted ASU No. 2014-08 during the first quarter of 2014. The Company’s adoption of ASU No. 2014-08 did not have a material impact on its consolidated financial statements.

XML

Noncontrolling Interests Redeemable interest in property partnership (Narrative) (Details) (Fountain Square [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Oct. 04, 2012
Fountain Square [Member]
Noncontrolling Interest [Line Items]
Aggregate purchase price	$ 385.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	211.3
Ownership Percentage	50.00%
Payments to Acquire Businesses, Gross	87.0
Noncontrolling Interest, Ownership Percentage by Parent	50.00%
Future Fixed Price to Acquire Remaining Portion of Joint venture	$ 102.0
Fixed Price Option Expiration Date	Jan. 31, 2016

XML

Basis Of Presentation And Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	$ 4,430,110,000		$ 4,449,734,000
Mezzanine notes payable	310,735,000		311,040,000
Unsecured senior notes	5,836,290,000		5,835,854,000
Unsecured exchangeable senior notes	0		744,880,000
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	4,430,110,000		4,449,734,000
Mezzanine notes payable	310,735,000		311,040,000
Unsecured senior notes	5,836,290,000		5,835,854,000
Unsecured exchangeable senior notes	0	[1]	744,880,000	[1]
Total	10,577,135,000		11,341,508,000
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	4,577,435,000		4,545,283,000
Mezzanine notes payable	310,764,000		311,064,000
Unsecured senior notes	6,145,060,000		6,050,517,000
Unsecured exchangeable senior notes	0		750,266,000
Total	11,033,259,000		11,657,130,000
ASC 470-20 Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impact of accounting pronouncement			$ 2,400,000

[1] Includes the net adjustment for the equity component allocation totaling approximately $2.4 million at December 31, 2013.

XML

Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accounting Policies [Abstract]
Reclassification between General and administrative expense and real estate operating expenses	$ 1.9

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Stockholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended					3 Months Ended		0 Months Ended	3 Months Ended				3 Months Ended
	Jan. 29, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 18, 2014	Dec. 31, 2013	Mar. 31, 2014 Atm Program [Member]	Mar. 31, 2014 Quarter 4 2013 [Member]	Mar. 31, 2014 Quarter 1 2014 [Member]	Feb. 18, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 31, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 27, 2018 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 18, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 31, 2014 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 1 2014 [Member]	Mar. 31, 2014 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 2 2014 [Member]	Mar. 27, 2018 Depository shares of Series B Cumulative Redeemable Preferred [Member]	Mar. 31, 2014 Depository shares of Series B Cumulative Redeemable Preferred [Member]
Class of Stock [Line Items]
Common stock, shares outstanding		153,017,311			152,983,101
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 its Common Stock in connection with the redemption of an equal number of OP Units		18,528
Dividend payable date							Jan. 29, 2014	Apr. 30, 2014						Feb. 18, 2014	May 15, 2014
Dividend paid on common stock (in dollars per share)	$ 2.90								$ 32.8125
Dividend shareholder of record date							Dec. 31, 2013	Mar. 31, 2014							May 05, 2014
Dividends payable, date declared								Mar. 18, 2014							Mar. 18, 2014
Dividends Payable, Amount Per Share				$ 0.65								$ 32.8125
Series B, Shares Outstanding										80,000			80,000				8,000,000
Series B, Dividend Rate, Percentage										5.25%
Series B, Liquidation Preference Per Share										$ 2,500.00	$ 2,500.00		$ 2,500			$ 25.00	$ 25.00
Proceeds from Issuance of Series B		$ 0	$ 194,371,000
Ratio of depository shares to shares of Series B Preferred Stock										0.01

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Real Estate Activity During the Three Months Ended march 31, 2014 (Narrative) (Details) (The Avant at Reston Town Center Residential [Member])	Feb. 10, 2014 sqft apartments
The Avant at Reston Town Center Residential [Member]
Real Estate Properties [Line Items]
Number of apartment units	359
Net Rentable Area	355,000

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Real Estate Activity During the Three Months Ended march 31, 2014 (Summary Of The Discontinued Operations Related To Montvale Center, 303 Almaden Blvd, 1301 New York Avenue, One Preserve Parkway and 10 & 20 Burlington Mall Road) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	$ 574,694	$ 477,826
Expenses
Depreciation and amortization	154,270	119,453
Total expenses	397,797	349,824
Operating income	176,897	128,002
Other expense
Interest expense	113,554	100,433
Income from discontinued operations	0	2,494
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership	0	(2,066)
Income from discontinued operations attributable to Boston Properties, Inc.		17,369
Gain on forgiveness of debt from discontinued operations	0	20,182
Impairment loss from discontinued operations	0	(3,241)
Montvale Center, 303 Almaden Blvd, 1301 New York Avenue, One Preserve Parkway and 10 & 20 Burlington Mall Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue		7,035
Expenses
Operating		2,443
Depreciation and amortization		1,738
Total expenses		4,181
Operating income		2,854
Other expense
Interest expense		360
Income from discontinued operations		2,494
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership		(253)
Income from discontinued operations attributable to Boston Properties, Inc.		2,241
Gain on forgiveness of debt from discontinued operations		20,182
Impairment loss from discontinued operations		(3,241)
Noncontrolling interest in gain on forgiveness of debt from discontinued operations - common units of the Operating Partnership		1,813
Gain On Forgiveness of Debt and Impairment Losses from Discontinued Operations Attributable to Company		$ 15,128

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Organization

3 Months Ended

Mar. 31, 2014

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 March 31, 2014 owned an approximate 89.5% (89.0% at March 31, 2013) 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”). On January 31, 2014, the measurement period for the Company’s 2011 OPP Unit awards expired and the Company’s total return to shareholders (“TRS”) was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Unit awards. Accordingly, all 2011 OPP Unit awards were automatically forfeited (See Note 7 and 10). In February 2013 and February 2014, the Company issued LTIP Units in connection with the granting to employees of multi-year, long-term incentive program ("MYLTIP") awards (also referred to as “2013 MYLTIP Units” and “2014 MYLTIP Units,” respectively, and collectively as "MYLTIP Units"). Because the rights, preferences and privileges of OPP Units and 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 MYLTIP Units (See Notes 7 and 10).

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 8).

At March 31, 2014, 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 7).

• 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 7).

• 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 8).

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 March 31, 2014, the Company owned or had interests in a portfolio of 175 commercial real estate properties (the “Properties”) aggregating approximately 45.8 million net rentable square feet, including eight properties under construction totaling approximately 4.0 million net rentable square feet. In addition, the Company has structured parking for approximately 45,971 vehicles containing approximately 15.7 million square feet. At March 31, 2014, 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.

The Company owns or controls undeveloped land parcels totaling approximately 502.5 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.

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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Square 407 Limited Partnership [Member]	Mar. 31, 2014 The Metropolitan Square Associates LLC [Member]	Mar. 31, 2014 BP/CRF 901 New York Avenue LLC [Member]		Mar. 31, 2014 WP Project Developer LLC [Member]		Mar. 31, 2014 Boston Properties Office Value-Added Fund, L.P. [Member]		Mar. 31, 2014 Annapolis Junction NFM, LLC [Member] Buildings Land_Parcels		Mar. 31, 2014 2 GCT Venture LLC [Member]		Mar. 31, 2014 540 Madison Venture LLC [Member]	Mar. 31, 2014 125 West 55th Street Venture LLC [Member]		Mar. 31, 2014 500 North Capitol LLC [Member]	Mar. 31, 2014 Entity Owning Land And Infrastructure Of Project [Member]
Schedule of Equity Method Investments [Line Items]
Properties			Market Square North	Metropolitan Square	901 New York Avenue	[1]	Wisconsin Place Land and Infrastructure	[2]	N/A	[3]	Annapolis Junction	[4]	N/A		540 Madison Avenue	N/A	[5]	500 North Capitol Street, NW
Equity Method Investment, Ownership Percentage			50.00%	51.00%	25.00%	[1]	33.30%	[2]	39.50%	[6]	50.00%	[3]	60.00%	[4]	60.00%	60.00%	[5]	30.00%	33.30%
Carrying value of the Company's investments in unconsolidated joint ventures	$ 127,356	$ 126,084	$ (9,758)	$ 6,236	$ (2,509)		$ 46,944		$ (30)		$ 17,528		$ (91)		$ 69,002	$ 944		$ (910)
Number of real estate properties											2
Number of buildings under construction											1
Parcels of undeveloped land											2

[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 garage and infrastructure of the project.

[3] Comprised of two buildings, one building under construction and two undeveloped land parcels (See also Note 12).

[4] Two Grand Central Tower was sold on October 25, 2011.

[5] 125 West 55th Street was sold on May 30, 2013.

[6] The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013.

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(Common Units) (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended
	Jan. 29, 2014	Mar. 31, 2014 Y	Mar. 18, 2014
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption (in shares)		18,528
Redemption of OP units issued on conversion of LTIP Units (in shares)		17,191
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
Distribution paid to outperformance awards, OPP Units (in dollars per share)	$ 0.065
Distribution declared to OP and LTIP units by Boston Properties, Inc. (in dollars per share)			$ 0.65
Distribution declared to outperformance awards OPP Units by Boston Properties, Inc. (in dollars per share)			$ 0.065
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		$ 2,000,000,000
Value of Series Two Preferred Units assuming conversion		$ 100,100,000
Closing price of common stock (in dollars per share)		$ 114.53
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)		394,590
MYLTIP [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
2013 MYLTIP		314,974
MYLTIP 2014 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Two thousand fourteen MYLTIP		483,555
Quarter 4 2013 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date		Jan. 29, 2014
Quarter 4 2013 [Member] | OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date		Jan. 29, 2014
Holders of record date		Dec. 31, 2013
Quarter 1 2014 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date		Apr. 30, 2014
Dividends payable, date declared		Mar. 18, 2014
Quarter 1 2014 [Member] | OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date		Apr. 30, 2014
Holders of record date		Mar. 31, 2014
Dividends payable, date declared		Mar. 18, 2014
special dividend [Member] | OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Distributions made to OP and LTIP units per unit (in dollars per share)	$ 2.25

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Real estate, at cost	$ 17,258,665	$ 17,158,210
Construction in progress	1,564,821	1,523,179
Land held for future development	300,498	297,376
Less: accumulated depreciation	(3,263,208)	(3,161,571)
Total real estate	15,860,776	15,817,194
Cash and cash equivalents	1,179,573	2,365,137
Cash held in escrows	54,240	57,201
Investments in securities	18,026	16,641
Tenant and other receivables (net of allowance for doubtful accounts of $1,625 and $1,636, respectively)	37,812	59,464
Accrued rental income (net of allowance of $3,448 and $3,636, respectively	661,730	651,603
Deferred charges, net	861,567	884,450
Prepaid expenses and other assets	178,488	184,477
Investments in unconsolidated joint ventures	127,356	126,084
Total assets	18,979,568	20,162,251
Liabilities:
Mortgage notes payable	4,430,110	4,449,734
Unsecured senior notes (net of discount of $13,710 and $14,146 respectively)	5,836,290	5,835,854
Unsecured exchangeable senior notes (net of discount of $0 and $182, respectively	0	744,880
Unsecured line of credit	0	0
Mezzanine notes payable	310,735	311,040
Outside member's notes payable	180,000	180,000
Accounts payable and accrued expenses	218,028	202,470
Dividends and distributions payable	114,799	497,242
Accrued interest payable	178,651	167,523
Other liabilities	556,772	578,969
Total liabilities	11,825,385	12,967,712
Commitments and contingencies	0	0
Noncontrolling interest:
Redeemable preferred units of the Operating Partnership	51,312	51,312
Redeemable interest in property partnerships	100,327	99,609
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 of $2,500 per share, 92,000 shares authorized, 80,000 shares issued and outstanding at March 31, 2014 and December 31,2013	200,000	200,000
Common stock, $.01 par value, 250,000,000 shares authorized, 153,096,211 and 153,062,001 issued and 153,017,311 and 152,983,101 outstanding at March 31, 2014 and December 31, 2013, respectively	1,530	1,530
Additional paid-in capital	5,668,230	5,662,453
Dividends in excess of earnings	(153,979)	(108,552)
Treasury common stock at cost, 78,900 shares at March 31, 2014 and December 31, 2013	(2,722)	(2,722)
Accumulated other comprehensive loss	(10,989)	(11,556)
Total stockholders' equity attributable to Boston Properties, Inc.	5,702,070	5,741,153
Noncontrolling interests:
Common units of the Operating Partnership	575,381	576,333
Property partnerships	725,093	726,132
Total equity	7,002,544	7,043,618
Total liabilities and equity	$ 18,979,568	$ 20,162,251

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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc., Income (Numerator)	$ 54,034	$ 30,485
Net income attributable to Boston Properties Inc., Shares (Denominator)	153,030	151,646
Inceom (loss) from continuing operations before discontinued operations and allocation of undistributed earnings (dollars per share)	$ 0.35
Income from continuing operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share)	$ 0.35	$ 0.20
Discontinued operations attributable to Boston Properties, Inc., Income (Numerator)		17,369
Discontinued operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share)	$ 0.00	$ 0.12
Net Income (Loss) Available to Common Stockholders, Basic	54,034	47,854
Net income (in dollars per share)	$ 0.35	$ 0.32
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes, Income (Numerator)	0	0
Stock Based Compensation and Exchangeable Senior Notes, Shares (Denominator)	139	306
Stock Based Compensation and Exchangeable Senior Notes, Per Share Amount (in dollars per share)	$ 0.00	$ (0.01)
Diluted Earnings:
Diluted Earnings: Net income, Income (Numerator)	$ 54,034	$ 47,854
Diluted Earnings: Net income, Shares (Denominator)	153,169	151,952
Diluted Earnings: Net income, Per Share Amount (in dollars per share)	$ 0.35	$ 0.31

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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, 2012	$ 5,634,854	$ 1,516		$ 5,222,073	$ (109,985)	$ (2,722)	$ (13,817)	$ 537,789
Equity, shares at Dec. 31, 2012		151,601,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units to Common Stock, shares		9,000
Conversion of operating partnership units to Common Stock, value	0	0		272				(272)
Allocated net income for the year	54,743				48,000			6,743
Dividends/distributions declared	(110,158)				(98,712)			(11,446)
Issuance of 5.25% Series B cumulative redeemable preferred stock	194,371		200,000	(5,629)
Sale of common stock, net of offering costs		0
Sale of common stock, net of offering costs		0
Shares issued pursuant to stock purchase plan, shares		3,000
Shares issued pursuant to stock purchase plan, value	335			335
Net activity from stock option and incentive plan, shares		27,000
Net activity from stock option and incentive plan, value	20,806	0		4,262				16,544
Contributions from noncontrolling interests in property partnerships	10,421							10,421
Distributions to noncontrolling interests in property partnerships	(750)							(750)
Amortization of interest rate contracts	628						564	64
Reallocation of noncontrolling interest	0			10,717				(10,717)
Equity, value at Mar. 31, 2013	5,805,250	1,516	200,000	5,232,030	(160,697)	(2,722)	(13,253)	548,376
Equity, shares at Mar. 31, 2013		151,640,000
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units to Common Stock, shares		18,000
Conversion of operating partnership units to Common Stock, value				627				(627)
Allocated net income for the year	65,369				56,623			8,746
Dividends/distributions declared	(113,268)				(102,050)			(11,218)
Shares issued pursuant to stock purchase plan, shares		4,000
Shares issued pursuant to stock purchase plan, value	357			357
Net activity from stock option and incentive plan, shares		12,000
Net activity from stock option and incentive plan, value	9,464			704				8,760
Contributions from noncontrolling interests in property partnerships	468							468
Distributions to noncontrolling interests in property partnerships	(4,093)							(4,093)
Amortization of interest rate contracts	629						567	62
Reallocation of noncontrolling interest				4,089				(4,089)
Equity, value at Mar. 31, 2014	$ 7,002,544	$ 1,530	$ 200,000	$ 5,668,230	$ (153,979)	$ (2,722)	$ (10,989)	$ 1,300,474
Equity, shares at Mar. 31, 2014	153,017,311	153,017,000

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Unsecured Exchangeable Senior Notes Unsecured Exchangeable Senior Notes (Narrative) (details) (3.625% exchangeable senior notes [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Feb. 18, 2014
3.625% exchangeable senior notes [Member]
Debt Instrument [Line Items]
Coupon/Stated Rate	3.625%
Repayments of unseucred senior notes	$ 747.5

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Real Estate Activity During the Three Months Ended march 31, 2014 (Tables)

3 Months Ended

Mar. 31, 2014

Business Acquisition [Line Items]

Summary Of The Discontinued Operations Related To Montvale Center, 303 Almaden Blvd, 1301 New York Avenue and Bedford Business Park

The following table summarizes the income from discontinued operations for the three months ended March 31, 2013 related to One Preserve Parkway, 10 & 20 Burlington Mall Road, 1301 New York Avenue, Montvale Center and 303 Almaden Boulevard and the related gain on forgiveness of debt and impairment loss:

	For the three months ended March 31,
	2013
	(in thousands)
Total revenue	$	7,035
Expenses
Operating	2,443
Depreciation and amortization	1,738
Total expenses	4,181
Operating income	2,854
Other expense
Interest expense	360
Income from discontinued operations	$	2,494
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership	(253		)
Income from discontinued operations attributable to Boston Properties, Inc.	$	2,241
Gain on forgiveness of debt from discontinued operations	$	20,182
Impairment loss from discontinued operations	(3,241		)
Noncontrolling interest in gain on forgiveness of debt and impairment loss from discontinued operations – common units of the Operating Partnership	(1,813		)
Gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	15,128

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Commitments And Contingencies (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2009	Jan. 10, 2014
Commitments And Contingencies [Line Items]
Letter of credit and performance obligations	$ 13,200,000
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
767 Venture, LLC [Member]
Commitments And Contingencies [Line Items]
Maximum funding obligation	11,700,000
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	250,000,000
John Hancock Tower [Member]
Commitments And Contingencies [Line Items]
Guarantee Obligation Related To Tenant Re-Leasing Costs	21,400,000
Debt Instrument, 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
Lehman [Member]
Commitments And Contingencies [Line Items]
Bankruptcy claim, amount filed by general creditor		45,300,000
Bankruptcy claim amount allowed by court to creditor			$ 45,200,000
Bankruptcy claim, denominator used to evaluate claim price amount	1.00
Lehman [Member] | Minimum [Member]
Commitments And Contingencies [Line Items]
Bankruptcy claim, price on the private market	0.42
Lehman [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Bankruptcy claim, price on the private market	0.45

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Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2014

Noncontrolling Interest [Abstract]

Schedule Of Series Two Preferred Units

The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the three months ended March 31, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	51,312
Net income	619
Distributions	(619		)
Balance at March 31, 2014	$	51,312
Balance at January 1, 2013	$	110,876
Net income	1,180
Distributions	(1,180		)
Balance at March 31, 2013	$	110,876

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 three months ended March 31, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	99,609
Net loss	(106		)
Distributions	(1,050		)
Adjustment to reflect redeemable interest at redemption value	1,874
Balance at March 31, 2014	$	100,327
Balance at January 1, 2013	$	97,558
Net loss	(525		)
Distributions	(1,350		)
Adjustment to reflect redeemable interest at redemption value	2,533
Balance at March 31, 2013	$	98,216

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 67,756	$ 57,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	154,270	121,191
Non-cash compensation expense	10,380	25,783
Impairment loss	0	8,306
Income from unconsolidated joint ventures	(2,816)	(8,721)
Distributions of net cash flow from operations of unconsolidated joint ventures	1,431	12,921
Gains from investments in securities	(286)	(735)
Non-cash portion of interest expense	(7,676)	10,561
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes	(92,979)	0
Gain on forgiveness of debt from discontinued operations	0	(20,182)
Impairment loss from discontinued operations	0	3,241
Change in assets and liabilities:
Cash held in escrows	2,961	(297)
Tenant and other receivables, net	21,652	10,690
Accrued rental income, net	(10,127)	(14,295)
Prepaid expenses and other assets	5,989	18,684
Accounts payable and accrued expenses	1,288	(1,172)
Accrued interest payable	11,128	30,158
Other liabilities	(22,197)	(7,703)
Tenant leasing costs	(16,565)	(8,932)
Total adjustments	56,453	179,498
Net cash provided by operating activities	124,209	237,429
Cash flows from investing activities:
Acquisitions of real estate	0	(289,816)
Construction in progress	(97,025)	(103,178)
Building and other capital improvements	(17,510)	(14,162)
Tenant improvements	(31,551)	(24,988)
Repayments of notes receivable, net	0	184
Capital contributions to unconsolidated joint ventures	0	(113)
Capital distributions from unconsolidated joint ventures	113	0
Investments in securities, net	(1,099)	(918)
Net cash used in investing activities	(147,072)	(432,991)
Cash flows from financing activities:
Repayments of mortgage notes payable	(6,630)	(23,687)
Redemption/repurchase of unsecured exchangeable senior notes	(654,521)	0
Deferred financing costs	(18)	0
Net proceeds from preferred stock issuance	0	194,371
Net proceeds from equity transactions	(527)	(559)
Dividends and distributions	(496,330)	(110,940)
Contributions from noncontrolling interest in property partnerships	468	5,875
Distributions to noncontrolling interest in property partnerships	(5,143)	(2,100)
Net cash provided by (used in) financing activities	(1,162,701)	62,960
Net decrease in cash and cash equivalents	(1,185,564)	(132,602)
Cash and cash equivalents, beginning of period	2,365,137	1,041,978
Cash and cash equivalents, end of period	1,179,573	909,376
Supplemental disclosures:
Cash paid for interest	220,790	74,492
Interest capitalized	17,709	14,418
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	9,393	7,475
Mortgage note payable extinguished through foreclosure	0	25,000
Real estate transferred upon foreclosure	0	7,508
Land improvements contributed by noncontrolling interest in property partnership	0	4,546
Dividends and distributions declared but not paid	114,799	110,886
Conversions of noncontrolling interests to stockholders' equity	627	272
Issuance of restricted securities to employees and directors	$ 26,534	$ 25,901

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Tenant and other receivables, allowance for doubtful accounts	$ 1,625	$ 1,636
Accrued rental income, allowance	3,448	3,636
Unsecured senior notes, discount	13,710	14,146
Unsecured exchangeable senior notes, discount	$ 0	$ 182
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
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	153,096,211	153,062,001
Common stock, shares outstanding	153,017,311	152,983,101
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	92,000
Series B Dividend Rate Percentage	5.25%	0.00%
Series B, Liquidation Preference Per Share	$ 2,500.00	$ 2,500.00
Series B, shares issued	80,000	80,000
Series B, Shares Outstanding	80,000	80,000

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Stock Option and Incentive Plan

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option and Incentive Plan

Stock Option and Incentive Plan

On January 27, 2014, the Company's Compensation Committee approved 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, if any, 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 $0 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; and 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 as of the date of the change of control based upon performance through such date as measured against performance hurdles (without proration). 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 $12.7 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 measurement period for the Company’s 2011 OPP Unit awards expired and the Company’s TRS was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Unit awards. Accordingly, all 2011 OPP Unit awards were automatically forfeited.

During the three months ended March 31, 2014, the Company issued 21,455 shares of restricted common stock, no non-qualified stock options, 121,567 LTIP Units and 485,459 2014 MYLTIP Units to employees under the 2012 Plan. Employees paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and 2014 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. The shares of restricted stock granted during the three months ended March 31, 2014 were valued at approximately $2.3 million ($108.09 per share). The LTIP Units granted were valued at approximately $12.2 million ($100.16 per unit weighted-average fair value) using a Monte Carlo simulation method model. The per unit fair value of each LTIP Unit granted was estimated on the date of grant using the following assumptions: an expected life of 5.7 years, a risk-free interest rate of 1.84% and an expected price volatility of 27%. As the 2011 OPP Units, 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2011 OPP Units, 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units 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, 2013 MYLTIP Units and 2014 MYLTIP Units was approximately $9.9 million and $25.5 million for the three months ended March 31, 2014 and 2013, respectively. On January 31, 2014, the measurement period for the Company’s 2011 OPP Awards expired and the Company’s TRS 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. For the three months ended March 31, 2013, stock-based compensation expense includes approximately $16.9 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. At March 31, 2014, there was $24.9 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $20.6 million of unrecognized compensation expense related to unvested 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 3.3 years.

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Document And Entity Information	3 Months Ended
	Mar. 31, 2014	May 05, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
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		153,040,988

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Segment Information

3 Months Ended

Mar. 31, 2014

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. Beginning on January 1, 2014, the properties that were historically part of the Princeton region are reflected as the suburban component of the New York region. The operations for the Princeton region, including the reclassification between Rental Operating Expenses and General and Administrative Expenses for the three months ended March 31, 2013 as detailed below, have been included in the New York region. The Company’s segments by geographic area are Boston, New York, 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 income, general and administrative expenses, transaction costs, impairment loss, interest expense, depreciation and amortization expense, gains from investments in securities, income from unconsolidated joint ventures, 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.

In the third quarter of 2013, the Company 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. For San Francisco these expenses, which totaled approximately $1.5 million for the three months ended March 31, 2013, and for Princeton these expenses, which totaled approximately $0.4 million for the three months ended March 31, 2013, were previously included in Rental Operating Expenses and are now included in General and Administrative Expenses.

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. 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 three months ended March 31, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	170,942		$	217,308		$	54,608		$	97,048		$	539,906
Office/Technical	5,820			—			6,217			3,660			15,697
Residential	1,163			—			—			4,519			5,682
Hotel	8,193			—			—			—			8,193
Total	186,118			217,308			60,825			105,227			569,478
% of Grand Totals	32.68		%	38.16		%	10.68		%	18.48		%	100.0		%
Rental Expenses:
Class A Office	71,398			74,371			19,313			33,439			198,521
Office/Technical	1,689			—			1,214			1,202			4,105
Residential	448			—			—			3,314			3,762
Hotel	6,797			—			—			—			6,797
Total	80,332			74,371			20,527			37,955			213,185
% of Grand Totals	37.68		%	34.89		%	9.63		%	17.80		%	100.0		%
Net operating income	$	105,786		$	142,937		$	40,298		$	67,272		$	356,293
% of Grand Totals	29.69		%	40.12		%	11.31		%	18.88		%	100.0		%

For the three months ended March 31, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	160,824		$	138,523		$	52,671		$	93,359		$	445,377
Office/Technical	5,653			—			151			4,043			9,847
Residential	1,067			—			—			4,511			5,578
Hotel	8,291			—			—			—			8,291
Total	175,835			138,523			52,822			101,913			469,093
% of Grand Totals	37.48		%	29.53		%	11.26		%	21.73		%	100.0		%
Rental Expenses:
Class A Office	65,287			49,088			18,373			30,755			163,503
Office/Technical	1,787			—			35			1,004			2,826
Residential	443			—			—			2,290			2,733
Hotel	7,044			—			—			—			7,044
Total	74,561			49,088			18,408			34,049			176,106
% of Grand Totals	42.35		%	27.87		%	10.45		%	19.33		%	100.0		%
Net operating income	$	101,274		$	89,435		$	34,414		$	67,864		$	292,987
% of Grand Totals	34.57		%	30.53		%	11.75		%	23.15		%	100.0		%

The following is a reconciliation of Net Operating Income to net income attributable to Boston Properties, Inc.:

	Three months ended March 31,
	2014		2013
	(in thousands)
Net Operating Income	$	356,293	$	292,987
Add:
Development and management services income	5,216		8,733
Income from unconsolidated joint ventures	2,816		8,721
Interest and other income	1,311		1,471
Gains from investments in securities	286		735
Income from discontinued operations	—		2,494
Gain on forgiveness of debt from discontinued operations	—		20,182
Less:
General and administrative expense	29,905		45,516
Transaction costs	437		443
Depreciation and amortization expense	154,270		119,453
Interest expense	113,554		100,433
Impairment loss	—		8,306
Impairment loss from discontinued operations	—		3,241
Noncontrolling interest in property partnerships	4,354		2,574
Noncontrolling interest—redeemable preferred units of the Operating Partnership	619		1,180
Noncontrolling interest—common units of the Operating Partnership	6,160		4,111
Noncontrolling interest in discontinued operations—common units of the Operating Partnership	—		2,066
Net income attributable to Boston Properties, Inc.	$	56,623	$	48,000

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue
Base rent	$ 455,018	$ 373,046
Recoveries from tenants	81,934	64,319
Parking and other	24,333	23,437
Total rental revenue	561,285	460,802
Hotel revenue	8,193	8,291
Development and management services	5,216	8,733
Total revenue	574,694	477,826
Expenses
Rental	206,388	169,062
Hotel	6,797	7,044
General and administrative	29,905	45,516
Transaction costs	437	443
Impairment loss	0	8,306
Depreciation and amortization	154,270	119,453
Total expenses	397,797	349,824
Operating income	176,897	128,002
Other income (expense)
Income from unconsolidated joint ventures	2,816	8,721
Interest and other income	1,311	1,471
Gains from investments in securities	286	735
Interest expense	(113,554)	(100,433)
Income from continuing operations	67,756	38,496
Discontinued operations
Income from discontinued operations	0	2,494
Gain on forgiveness of debt from discontinued operations	0	20,182
Impairment loss from discontinued operations	0	(3,241)
Net income	67,756	57,931
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(4,354)	(2,574)
Noncontrolling interest - redeemable preferred units of the Operating Partnership	(619)	(1,180)
Noncontrolling interest - common units of the Operating Partnership	(6,160)	(4,111)
Noncontrolling interest in discontinued operations - common units of the Operating Partnership	0	(2,066)
Net income attributable to Boston Properties, Inc.	56,623	48,000
Preferred dividends	(2,589)	(146)
Net income attributable to Boston Properties, Inc. common shareholders	$ 54,034	$ 47,854
Basic earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations (in dollars per share)	$ 0.35	$ 0.20
Discontinued operations (in dollars per share)	$ 0.00	$ 0.12
Net income (in dollars per share)	$ 0.35	$ 0.32
Weighted average number of common shares outstanding (in shares)	153,030	151,646
Diluted earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations (in dollars per share)	$ 0.35	$ 0.20
Discontinued operations (in dollars per share)	$ 0.00	$ 0.11
Diluted Earnings: Net income, Per Share Amount (in dollars per share)	$ 0.35	$ 0.31
Weighted average number of common and common equivalent shares outstanding (in shares)	153,169	151,952

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Unsecured Exchangeable Senior Notes Unsecured Exchangeable Senior Notes

3 Months Ended

Mar. 31, 2014

Unsecured Exchangeable Senior Notes [Abstract]

Unsecured Exchangeable Senior Notes

Unsecured Exchangeable Senior Notes

On February 18, 2014, the Company's Operating Partnership repaid at maturity the $747.5 million aggregate principal amount of its 3.625% exchangeable senior notes due 2014 plus accrued and unpaid interest thereon.

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Investments in Unconsolidated Joint Ventures

3 Months Ended

Mar. 31, 2014

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 March 31, 2014:

Entity	Properties	Nominal % Ownership			Carrying Value of Investment
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.0	%		$	(9,758	)
The Metropolitan Square Associates LLC	Metropolitan Square	51.0	%		6,236
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0	%	(1)	(2,509		)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3	%	(2)	46,944
Boston Properties Office Value-Added Fund, L.P.	N/A	39.5	%	(3)	(30		)
Annapolis Junction NFM, LLC	Annapolis Junction	50.0	%	(4)	17,528
2 GCT Venture LLC	N/A	60.0	%	(5)	(91		)
540 Madison Venture LLC	540 Madison Avenue	60.0	%		69,002
125 West 55th Street Venture LLC	N/A	60.0	%	(6)	944
500 North Capitol LLC	500 North Capitol Street, NW	30.0	%		(910		)
					$	127,356

 _______________

(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 garage and infrastructure of the project.

(3) The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013.

(4) Comprised of two buildings, one building under construction and two undeveloped land parcels (See also Note 12).

(5) Two Grand Central Tower was sold on October 25, 2011.

(6) 125 West 55th Street was sold on May 30, 2013.

Certain of the Company’s unconsolidated 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 Company's unconsolidated joint ventures are as follows:

	March 31, 2014			December 31, 2013
	(in thousands)
ASSETS
Real estate and development in process, net	$	921,524		$	924,297
Other assets	158,375			163,149
Total assets	$	1,079,899		$	1,087,446
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	748,700		$	749,732
Other liabilities	19,593			28,830
Members’/Partners’ equity	311,606			308,884
Total liabilities and members’/partners’ equity	$	1,079,899		$	1,087,446
Company’s share of equity	$	155,807		$	154,726
Basis differentials (1)	(28,451		)	(28,642		)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	127,356		$	126,084

 _______________

(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 Company's unconsolidated joint ventures are as follows:

	For the three months ended March 31,
	2014		2013
	(in thousands)
Total revenue (1)	$	38,034	$	135,650
Expenses
Operating	15,464		42,366
Depreciation and amortization	9,092		39,277
Total expenses	24,556		81,643
Operating income	13,478		54,007
Other expense
Interest expense	8,012		56,234
Net income (loss)	$	5,466	$	(2,227	)
Company’s share of net income (loss)	$	2,625	$	(1,858	)
Basis differential	191		444
Elimination of inter-entity interest on partner loan	—		10,135
Income from unconsolidated joint ventures	$	2,816	$	8,721

 _______________ 

(1) Includes straight-line rent adjustments of $0.6 million and $4.0 million for the three months ended March 31, 2014 and 2013, respectively. Includes net below-market rent adjustments of $0.1 million and $20.4 million for the three months ended March 31, 2014 and 2013, respectively.

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Investments in Unconsolidated Joint Ventures (Tables)

3 Months Ended

Mar. 31, 2014

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at March 31, 2014:

Entity	Properties	Nominal % Ownership			Carrying Value of Investment
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.0	%		$	(9,758	)
The Metropolitan Square Associates LLC	Metropolitan Square	51.0	%		6,236
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0	%	(1)	(2,509		)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3	%	(2)	46,944
Boston Properties Office Value-Added Fund, L.P.	N/A	39.5	%	(3)	(30		)
Annapolis Junction NFM, LLC	Annapolis Junction	50.0	%	(4)	17,528
2 GCT Venture LLC	N/A	60.0	%	(5)	(91		)
540 Madison Venture LLC	540 Madison Avenue	60.0	%		69,002
125 West 55th Street Venture LLC	N/A	60.0	%	(6)	944
500 North Capitol LLC	500 North Capitol Street, NW	30.0	%		(910		)
					$	127,356

 _______________

(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 garage and infrastructure of the project.

(3) The Company acquired Mountain View Research Park and Mountain View Technology Park from the Value-Added Fund on April 10, 2013.

(4) Comprised of two buildings, one building under construction and two undeveloped land parcels (See also Note 12).

(5) Two Grand Central Tower was sold on October 25, 2011.

(6) 125 West 55th Street was sold on May 30, 2013.

Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block]

The combined summarized balance sheets of the Company's unconsolidated joint ventures are as follows:

	March 31, 2014			December 31, 2013
	(in thousands)
ASSETS
Real estate and development in process, net	$	921,524		$	924,297
Other assets	158,375			163,149
Total assets	$	1,079,899		$	1,087,446
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	748,700		$	749,732
Other liabilities	19,593			28,830
Members’/Partners’ equity	311,606			308,884
Total liabilities and members’/partners’ equity	$	1,079,899		$	1,087,446
Company’s share of equity	$	155,807		$	154,726
Basis differentials (1)	(28,451		)	(28,642		)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	127,356		$	126,084

 _______________

(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 Company's unconsolidated joint ventures are as follows:

	For the three months ended March 31,
	2014		2013
	(in thousands)
Total revenue (1)	$	38,034	$	135,650
Expenses
Operating	15,464		42,366
Depreciation and amortization	9,092		39,277
Total expenses	24,556		81,643
Operating income	13,478		54,007
Other expense
Interest expense	8,012		56,234
Net income (loss)	$	5,466	$	(2,227	)
Company’s share of net income (loss)	$	2,625	$	(1,858	)
Basis differential	191		444
Elimination of inter-entity interest on partner loan	—		10,135
Income from unconsolidated joint ventures	$	2,816	$	8,721

 _______________ 

(1) Includes straight-line rent adjustments of $0.6 million and $4.0 million for the three months ended March 31, 2014 and 2013, respectively. Includes net below-market rent adjustments of $0.1 million and $20.4 million for the three months ended March 31, 2014 and 2013, respectively.

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Subsequent Events

3 Months Ended

Mar. 31, 2014

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On April 10, 2014, a consolidated joint venture in which the Company has a 95% interest signed a lease with salesforce.com for 714,000 square feet at the new Salesforce Tower (formerly Transbay Tower), the 1.4 million square foot, 61-story Class A office development project currently under construction at 415 Mission Street in the South Financial District of San Francisco, California. In conjunction with the lease signing, the Company has committed to construct the building.

On April 10, 2014, the Company entered into a joint venture with an unrelated third party to acquire a parcel of land located at 501 K Street in Washington, DC. The Company anticipates the land parcel will accommodate an approximate 520,000 square foot Class A office property to be developed in the future. The joint venture partner contributed the land for its 50% interest in the joint venture and the Company contributed cash of approximately $39.0 million for its 50% interest.

On April 30, 2014, the Company's partner in its Annapolis Junction joint venture contributed a parcel of land and improvements and the Company contributed cash of approximately $5.4 million. The Company has a 50% interest in this joint venture. The joint venture has commenced construction of Annapolis Junction Building Eight, which when completed will consist of a Class A office property with approximately 125,000 net rentable square feet located in Annapolis, Maryland.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

As of March 31, 2014, the Company had 153,017,311 shares of Common Stock outstanding.

As of March 31, 2014, 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 three months ended March 31, 2014.

During the three months ended March 31, 2014, the Company issued 18,528 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from third parties.

On January 29, 2014, the Company paid a special cash dividend and regular quarterly dividend aggregating$2.90 per share of Common Stock to shareholders of record as of the close of business on December 31, 2013. On March 18, 2014, the Company's Board of Directors declared a dividend of $0.65 per share of Common Stock payable on April 30, 2014 to shareholders of record as of the close of business on March 31, 2014.

As of March 31, 2014, the Company had 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) outstanding of its 5.25% Series B Cumulative Redeemable Preferred Stock with a liquidation preference of $2,500.00 per share ($25.00 per depositary share). 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 February 18, 2014, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On March 18, 2014, the Company's Board of Directors declared a dividend of $32.8125 per share of Series B Preferred Stock payable on May 15, 2014 to shareholders of record as of the close of business on May 5, 2014.

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Commitments And Contingencies

3 Months Ended

Mar. 31, 2014

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 $13.2 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 its interest in the joint ventures. With limited exception, under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners (See also Note 7).

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 March 31, 2014, the maximum funding obligation under the guarantee was approximately $11.7 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 $21.4 million related to its obligations 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.

In 2009, the Company filed a general unsecured creditor’s claim against Lehman Brothers, Inc. for $45.3 million related to its rejection of a lease at 399 Park Avenue in New York City. On January 10, 2014, the trustee for the liquidation of Lehman Brothers allowed the Company’s claim in the amount of $45.2 million. Similar claims have recently been quoted privately within a range of $0.42 to $0.45 per $1.00 of claim. The Company is currently evaluating whether to attempt to sell the claim or wait until the trustee distributes proceeds from the Lehman estate. There can be no assurance as to the timing or amount of potential income, if any, that may ultimately be realized on the claim, whether by sale to a third party or by distribution from the trustee, and accordingly, the Company is disclosing this as a gain contingency.

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 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. 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 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's $1.0 billion portfolio property insurance program and the $250 million of additional Terrorism Coverage for 601 Lexington Avenue will continue to provide Terrorism Coverage through the expiration of the program on March 1, 2015, (ii) the Company will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (iii) if such insurance is not available at commercially reasonable rates with limits equal to our current coverage or at all, the Company may not continue to have full occurrence limit coverage for acts of terrorism, (iv) the Company may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (v) the Company may not be able to obtain future debt financings secured by individual properties and (vi) the Company may cancel the insurance policies issued by IXP for the NBCR Coverage 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 Salesforce Tower (formerly 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 Salesforce Tower (formerly 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 and the Company’s NBCR Coverage. 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.

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Noncontrolling Interests

3 Months Ended

Mar. 31, 2014

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 March 31, 2014, the noncontrolling interests in the Operating Partnership consisted of 15,583,853 OP Units, 1,554,353 LTIP Units, 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units, 483,555 2014 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 (none of which are convertible into OP Units) held by parties other than the Company.

Noncontrolling Interest—Redeemable Preferred Units of the Operating Partnership

The Preferred Units at March 31, 2014 included 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). On March 11, 2014, the Company notified the holders of the outstanding Series Two Preferred Units that it had elected to redeem all of such Series Two Preferred Units on May 12, 2014. As a result of the Company's election to redeem the units, all of the holders of the Series Two Preferred Units have elected to convert such units into 1.312336 OP Units, or an aggregate of 874,168 OP Units on or before May 12, 2014. 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.

On February 18, 2014, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit.

The Preferred Units at March 31, 2014 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 February 18, 2014, 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 three months ended March 31, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	51,312
Net income	619
Distributions	(619		)
Balance at March 31, 2014	$	51,312
Balance at January 1, 2013	$	110,876
Net income	1,180
Distributions	(1,180		)
Balance at March 31, 2013	$	110,876

Noncontrolling Interest—Redeemable Interest in Property Partnership

On October 4, 2012, the Company completed the formation of a joint venture that 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 three months ended March 31, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	99,609
Net loss	(106		)
Distributions	(1,050		)
Adjustment to reflect redeemable interest at redemption value	1,874
Balance at March 31, 2014	$	100,327
Balance at January 1, 2013	$	97,558
Net loss	(525		)
Distributions	(1,350		)
Adjustment to reflect redeemable interest at redemption value	2,533
Balance at March 31, 2013	$	98,216

Noncontrolling Interest—Common Units of the Operating Partnership

During the three months ended March 31, 2014, 18,528 OP Units were presented by the holders for redemption (including 17,191 OP Units issued upon conversion of LTIP Units) and were redeemed by the Company in exchange for an equal number of shares of Common Stock.

At March 31, 2014, the Company had outstanding 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units and 483,555 2014 MYLTIP Units. Prior to the measurement date (February 6, 2015 for 2012 OPP Units, February 4, 2016 for 2013 MYLTIP Units and February 3, 2017 for 2014 MYLTIP Units), holders of OPP Units and MYLTIP Units will be 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 MYLTIP Units, both vested and unvested, that OPP and MYLTIP award recipients have earned, if any, based on the establishment of a performance 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 31, 2014, the measurement period for the Company’s 2011 OPP Unit awards expired and the Company’s TRS was not sufficient for employees to earn and therefore become eligible to vest in any of the 2011 OPP Unit awards. Accordingly, all 2011 OPP Unit awards were automatically forfeited.

On January 29, 2014, the Operating Partnership paid a special cash distribution on the OP Units and LTIP Units in the amount of $2.25 per unit, a regular cash 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 December 31, 2013. The special cash distribution was in addition to the regular quarterly distribution on the OP Units and LTIP Units. Holders of the 2011 OPP Units, 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units are not entitled to receive any special distributions. Holders of Series Two Preferred Units will participate in the special cash dividend in connection with their conversion to OP Units in May 2014 as provided in the Operating Partnership's partnership agreement. On March 18, 2014, Boston Properties, Inc., as general partner of the Operating Partnership, declared a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit and a distribution on the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units in the amount of $0.065 per unit, in each case payable on April 30, 2014 to holders of record as of the close of business on March 31, 2014.

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 March 31, 2014 was approximately $2.0 billion and $100.1 million, respectively, based on the closing price of the Company’s common stock of $114.53 per share on March 31, 2014.

Noncontrolling Interests—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 $725.1 million at March 31, 2014 and approximately $726.1 million at December 31, 2013, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

On February 7, 2013, the partner in the Company's Salesforce Tower (formerly 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. In addition, if the Company elects to fund the construction of Salesforce Tower without a construction loan (or a construction loan of less than 50% of project costs), then the partner has the option to require the Company to fund up to 2.5% of the total project costs (i.e., of 50% of the partner's 5% interest in the venture) in the form of a loan to the partner.  This loan would bear interest at the then prevailing market construction loan interest rates. 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 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.

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.

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Earnings Per Share

3 Months Ended

Mar. 31, 2014

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 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 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 three months ended March 31, 2014
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	54,034	153,030	$	0.35
Effect of Dilutive Securities:
Stock Based Compensation	—		139	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	54,034	153,169	$	0.35
	For the three months ended March 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.	$	30,485	151,646	$	0.20
Discontinued operations attributable to Boston Properties, Inc.	17,369		—	0.12
Net income attributable to Boston Properties, Inc. common shareholders	$	47,854	151,646	$	0.32
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—		306	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	47,854	151,952	$	0.31

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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 574,694,000		$ 477,826,000
Expenses
Depreciation and amortization	154,270,000		119,453,000
Total expenses	397,797,000		349,824,000
Operating income	176,897,000		128,002,000
Other expense
Interest expense	(113,554,000)		(100,433,000)
Income from continuing operations	67,756,000		38,496,000
Net income	67,756,000		57,931,000
Income from unconsolidated joint ventures	2,816,000		8,721,000
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	38,034,000	[1]	135,650,000	[1]
Expenses
Operating	15,464,000		42,366,000
Depreciation and amortization	9,092,000		39,277,000
Total expenses	24,556,000		81,643,000
Operating income	13,478,000		54,007,000
Other expense
Interest expense	8,012,000		56,234,000
Net income	5,466,000		(2,227,000)
Company's share of net income (loss)	2,625,000		(1,858,000)
Basis differential	191,000		444,000
Elimination of inter-entity interest on partner loan	0		10,135,000
Income from unconsolidated joint ventures	2,816,000		8,721,000
Straight-line rent adjustments	600,000		4,000,000
"Above" and "below" market rent adjustments, net	$ 100,000		$ 20,400,000

[1] Includes straight-line rent adjustments of $0.6 million and $4.0 million for the three months ended March 31, 2014 and 2013, respectively. Includes net below-market rent adjustments of $0.1 million and $20.4 million for the three months ended March 31, 2014 and 2013, respectively.

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Subsequent Events subsequent Events (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Apr. 10, 2014 Salesforece Tower (formerly Transbay Tower) [Member] floor sqft	Feb. 26, 2013 Salesforece Tower (formerly Transbay Tower) [Member]	Feb. 07, 2013 Salesforece Tower (formerly Transbay Tower) [Member]	Apr. 10, 2014 five zero one K Street [Member] sqft	Apr. 30, 2014 Annapolis Junction Building Eight [Member] sqft	Apr. 10, 2014 Company [Member] Salesforece Tower (formerly Transbay Tower) [Member]	Apr. 10, 2014 Company [Member] five zero one K Street [Member]	Apr. 30, 2014 Company [Member] Annapolis Junction Building Eight [Member]
Subsequent Event [Line Items]
Capital contributions to unconsolidated joint ventures	$ 0	$ 113				$ 39,000	$ 5,400
Equity Method Investment, Ownership Percentage									50.00%	50.00%
Ownership Percentage				95.00%				95.00%
Square Footage Of Signed Lease			714,000
Net Rentable Area			1,400,000			520,000	125,000
Partners Joint Venture Ownership Percentage				5.00%	50.00%	50.00%
Number of floors real estate			61

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Basis Of Presentation And Summary Of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value

The following table presents the aggregate carrying value of the Company’s indebtedness and the Company’s corresponding estimate of fair value as of March 31, 2014 and December 31, 2013 (in thousands):

	March 31, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,430,110	$	4,577,435	$	4,449,734		$	4,545,283
Mezzanine notes payable	310,735		310,764		311,040			311,064
Unsecured senior notes	5,836,290		6,145,060		5,835,854			6,050,517
Unsecured exchangeable senior notes	—		—		744,880		(1)	750,266
Total	$	10,577,135	$	11,033,259	$	11,341,508		$	11,657,130

 _______________

(1) Includes the net adjustment for the equity component allocation totaling approximately $2.4 million at December 31, 2013.

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

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 three months ended March 31, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	170,942		$	217,308		$	54,608		$	97,048		$	539,906
Office/Technical	5,820			—			6,217			3,660			15,697
Residential	1,163			—			—			4,519			5,682
Hotel	8,193			—			—			—			8,193
Total	186,118			217,308			60,825			105,227			569,478
% of Grand Totals	32.68		%	38.16		%	10.68		%	18.48		%	100.0		%
Rental Expenses:
Class A Office	71,398			74,371			19,313			33,439			198,521
Office/Technical	1,689			—			1,214			1,202			4,105
Residential	448			—			—			3,314			3,762
Hotel	6,797			—			—			—			6,797
Total	80,332			74,371			20,527			37,955			213,185
% of Grand Totals	37.68		%	34.89		%	9.63		%	17.80		%	100.0		%
Net operating income	$	105,786		$	142,937		$	40,298		$	67,272		$	356,293
% of Grand Totals	29.69		%	40.12		%	11.31		%	18.88		%	100.0		%

For the three months ended March 31, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	160,824		$	138,523		$	52,671		$	93,359		$	445,377
Office/Technical	5,653			—			151			4,043			9,847
Residential	1,067			—			—			4,511			5,578
Hotel	8,291			—			—			—			8,291
Total	175,835			138,523			52,822			101,913			469,093
% of Grand Totals	37.48		%	29.53		%	11.26		%	21.73		%	100.0		%
Rental Expenses:
Class A Office	65,287			49,088			18,373			30,755			163,503
Office/Technical	1,787			—			35			1,004			2,826
Residential	443			—			—			2,290			2,733
Hotel	7,044			—			—			—			7,044
Total	74,561			49,088			18,408			34,049			176,106
% of Grand Totals	42.35		%	27.87		%	10.45		%	19.33		%	100.0		%
Net operating income	$	101,274		$	89,435		$	34,414		$	67,864		$	292,987
% of Grand Totals	34.57		%	30.53		%	11.75		%	23.15		%	100.0		%

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.:

	Three months ended March 31,
	2014		2013
	(in thousands)
Net Operating Income	$	356,293	$	292,987
Add:
Development and management services income	5,216		8,733
Income from unconsolidated joint ventures	2,816		8,721
Interest and other income	1,311		1,471
Gains from investments in securities	286		735
Income from discontinued operations	—		2,494
Gain on forgiveness of debt from discontinued operations	—		20,182
Less:
General and administrative expense	29,905		45,516
Transaction costs	437		443
Depreciation and amortization expense	154,270		119,453
Interest expense	113,554		100,433
Impairment loss	—		8,306
Impairment loss from discontinued operations	—		3,241
Noncontrolling interest in property partnerships	4,354		2,574
Noncontrolling interest—redeemable preferred units of the Operating Partnership	619		1,180
Noncontrolling interest—common units of the Operating Partnership	6,160		4,111
Noncontrolling interest in discontinued operations—common units of the Operating Partnership	—		2,066
Net income attributable to Boston Properties, Inc.	$	56,623	$	48,000

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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 539,906	$ 445,377
Rental Revenue: Office/Technical	15,697	9,847
Rental Revenue: Residential	5,682	5,578
Rental Revenue: Hotel	8,193	8,291
Total revenue	569,478	469,093
Rental Revenue: % of Grand Totals	100.00%	100.00%
Rental Expenses: Class A Office	198,521	163,503
Rental Expenses: Office/Technical	4,105	2,826
Rental Expenses: Residential	3,762	2,733
Rental Expenses: Hotel	6,797	7,044
Rental Expenses: Total	213,185	176,106
Rental Expenses: % Of Grand Totals	100.00%	100.00%
Net operating Income	356,293	292,987
Net operating Income: % of Grand Totals	100.00%	100.00%
Boston [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	170,942	160,824
Rental Revenue: Office/Technical	5,820	5,653
Rental Revenue: Residential	1,163	1,067
Rental Revenue: Hotel	8,193	8,291
Total revenue	186,118	175,835
Rental Revenue: % of Grand Totals	32.68%	37.48%
Rental Expenses: Class A Office	71,398	65,287
Rental Expenses: Office/Technical	1,689	1,787
Rental Expenses: Residential	448	443
Rental Expenses: Hotel	6,797	7,044
Rental Expenses: Total	80,332	74,561
Rental Expenses: % Of Grand Totals	37.68%	42.35%
Net operating Income	105,786	101,274
Net operating Income: % of Grand Totals	29.69%	34.57%
New York [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	217,308	138,523
Rental Revenue: Office/Technical	0	0
Rental Revenue: Residential	0	0
Rental Revenue: Hotel	0	0
Total revenue	217,308	138,523
Rental Revenue: % of Grand Totals	38.16%	29.53%
Rental Expenses: Class A Office	74,371	49,088
Rental Expenses: Office/Technical	0	0
Rental Expenses: Residential	0	0
Rental Expenses: Hotel	0	0
Rental Expenses: Total	74,371	49,088
Rental Expenses: % Of Grand Totals	34.89%	27.87%
Net operating Income	142,937	89,435
Net operating Income: % of Grand Totals	40.12%	30.53%
San Francisco [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	54,608	52,671
Rental Revenue: Office/Technical	6,217	151
Rental Revenue: Residential	0	0
Rental Revenue: Hotel	0	0
Total revenue	60,825	52,822
Rental Revenue: % of Grand Totals	10.68%	11.26%
Rental Expenses: Class A Office	19,313	18,373
Rental Expenses: Office/Technical	1,214	35
Rental Expenses: Residential	0	0
Rental Expenses: Hotel	0	0
Rental Expenses: Total	20,527	18,408
Rental Expenses: % Of Grand Totals	9.63%	10.45%
Net operating Income	40,298	34,414
Net operating Income: % of Grand Totals	11.31%	11.75%
Washington, DC [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	97,048	93,359
Rental Revenue: Office/Technical	3,660	4,043
Rental Revenue: Residential	4,519	4,511
Rental Revenue: Hotel	0	0
Total revenue	105,227	101,913
Rental Revenue: % of Grand Totals	18.48%	21.73%
Rental Expenses: Class A Office	33,439	30,755
Rental Expenses: Office/Technical	1,202	1,004
Rental Expenses: Residential	3,314	2,290
Rental Expenses: Hotel	0	0
Rental Expenses: Total	37,955	34,049
Rental Expenses: % Of Grand Totals	17.80%	19.33%
Net operating Income	$ 67,272	$ 67,864
Net operating Income: % of Grand Totals	18.88%	23.15%

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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) (USD $)			0 Months Ended			0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Feb. 26, 2013 Salesforece Tower (formerly Transbay Tower) [Member]	Feb. 07, 2013 Salesforece Tower (formerly Transbay Tower) [Member]	Apr. 10, 2014 Salesforece Tower (formerly Transbay Tower) [Member] sqft	May 31, 2013 767 Fifth Avenue (The GM Building) [Member]	May 31, 2013 767 Fifth Avenue (The GM Building) [Member] partners	Oct. 09, 2013 Time Square Tower [Member] sqft
Noncontrolling Interest [Line Items]
Property partnerships	$ 725,093,000	$ 726,132,000
Partners Joint Venture Ownership Percentage			5.00%	50.00%		40.00%
Ownership Percentage			95.00%
Number of Joint Venture Partners							2
Noncontrolling interest recorded upon consolidation						480,900,000
maximum percentage of construction costs to allow partner to have a loan			50.00%
Portion of total costs partner can require the company to fund			2.50%
portion of partners equity that can be funded by the company			50.00%
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
Net Rentable Area					1,400,000			1,246,000
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

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 67,756		$ 57,931
Other comprehensive income:
Amortization of interest rate contracts	629	[1]	628	[1]
Other Comprehensive Income	629		628
Comprehensive income	68,385		58,559
Net income attributable to noncontrolling interests	(11,133)		(9,931)
Other comprehensive income attributable to noncontrolling interest	(62)		(64)
Comprehensive income attributable to Boston Properties, Inc.	$ 57,190		$ 48,564

[1] Amounts reclassified from comprehensive income primarily to interest expense within the Company's Consolidated Statements of Operations.

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Real Estate Activity During the Three Months Ended march 31, 2014

3 Months Ended

Mar. 31, 2014

Real Estate [Abstract]

Real Estate Activity During the Nine Months Ended September 30, 2013

Real Estate Activity During the Three Months Ended March 31, 2014

Developments

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.

Dispositions

The Company did not have any dispositions during the three months ended March 31, 2014. The following table summarizes the income from discontinued operations for the three months ended March 31, 2013 related to One Preserve Parkway, 10 & 20 Burlington Mall Road, 1301 New York Avenue, Montvale Center and 303 Almaden Boulevard and the related gain on forgiveness of debt and impairment loss:

	For the three months ended March 31,
	2013
	(in thousands)
Total revenue	$	7,035
Expenses
Operating	2,443
Depreciation and amortization	1,738
Total expenses	4,181
Operating income	2,854
Other expense
Interest expense	360
Income from discontinued operations	$	2,494
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership	(253		)
Income from discontinued operations attributable to Boston Properties, Inc.	$	2,241
Gain on forgiveness of debt from discontinued operations	$	20,182
Impairment loss from discontinued operations	(3,241		)
Noncontrolling interest in gain on forgiveness of debt and impairment loss from discontinued operations – common units of the Operating Partnership	(1,813		)
Gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	15,128

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Organization (Details) (USD $)	3 Months Ended											3 Months Ended		3 Months Ended
	Mar. 31, 2014 Y sqft Vehicles acre	Mar. 31, 2013	Mar. 31, 2014 Commercial Real Estate Properties [Member] Real_Estate_Properties sqft	Mar. 31, 2014 Total Properties Under Construction [ Member] Real_Estate_Properties sqft	Mar. 31, 2014 Total Office Properties [ Member] Real_Estate_Properties	Mar. 31, 2014 Class A Office Properties [Member] Real_Estate_Properties	Mar. 31, 2014 Office Properties Under Construction [ Member] Real_Estate_Properties	Mar. 31, 2014 Office Technical Properties [Member] Real_Estate_Properties	Mar. 31, 2014 Hotel Property [ Member] Real_Estate_Properties	Mar. 31, 2014 Retail Properties [ Member] Real_Estate_Properties	Mar. 31, 2014 Residential Properties [Member] Real_Estate_Properties	Mar. 31, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Mar. 31, 2014 Series Two Preferred Units [Member]	Mar. 31, 2014 series four preferred units [Member]	Mar. 31, 2014 Series B Preferred Units [Member]	Mar. 31, 2014 depositary shares [Member] Series B Cumulative Redeemable Preferred Stock [Member]
Real Estate Properties [Line Items]
Ratio of depository shares to shares of Series B Preferred Stock												0.01
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
Series B, Shares Outstanding												80,000	80,000			80,000	8,000,000
Series B, Dividend Rate, Percentage												5.25%
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
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	8	167	128	8	39	1	4	3
Net Rentable Area			45,800,000	4,000,000
Number of vehicles in structured parking	45,971
Area of parking (in square feet)	15,700,000
Area of undeveloped land parcels owned (in acres)	502.5

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Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Feb. 18, 2014	Aug. 29, 2013 D
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
Series Two Preferred Units On Converted Basis	874,168
Series Four Preferred Units (in shares)	360,126
Series Two Preferred Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred Units Liquidation Preference	$ 50.00
OP Units for each Preferred Unit (in shares)	1.312336
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
Liquidation preference percentage	6.00%
Preferred Units Liquidation Preference	$ 50.00
Operating Units liquidation preference (in dollars per share)	$ 38.10
OP Units for each Preferred Unit (in shares)	1.312336
Series Two Preferred Units On Converted Basis	874,168
Distributions to Series Two Preferred Units (in dollars per share)		$ 0.85302
series four preferred units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred Units Liquidation Preference	$ 50.00
Series Four Preferred Units Annual Dividend Payable Rate	2.00%
series four preferred units [Member] | Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred Units Liquidation Preference	$ 50.00
First opportunity to redeem Series Four Preferred Units (in days)			30
Distributions to Series Two Preferred Units (in dollars per share)		$ 0.25
Series Four Preferred Units (in shares)	360,126
Series Four Preferred Units Annual Dividend Payable Rate	2.00%

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Basis Of Presentation And Summary Of Significant Accounting Policies Recent Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2014

Recent Accounting Pronouncements [Abstract]

Recent Accounting Pronouncement [Policy Text Block]

Recent Accounting Pronouncements

On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" (“ASU No. 2014-08”). ASU No. 2014-08 clarifies that discontinued operations presentation applies only to disposals representing a strategic shift that has (or will have) a major effect on an entity’s operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). ASU No. 2014-08 is effective prospectively for reporting periods beginning after December 15, 2014. Early adoption is permitted, and the Company early adopted ASU No. 2014-08 during the first quarter of 2014. The Company’s adoption of ASU No. 2014-08 did not have a material impact on its consolidated financial statements.