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 September 30, 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 $0.01 per share	153,099,786
(Class)	(Outstanding on November 3, 2014)

BOSTON PROPERTIES, INC.

FORM 10-Q

for the quarter ended September 30, 2014

TABLE OF CONTENTS 

		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements (unaudited)		1
	a) Consolidated Balance Sheets as of September 30, 2014 and December 31, 2013		1
	b) Consolidated Statements of Operations for the three and nine months ended September 30, 2014 and 2013		2
	c) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2014 and 2013		3
	d) Consolidated Statements of Stockholders’ Equity for the nine months ended September 30, 2014 and 2013		4
	e) Consolidated Statements of Cash Flows for the nine months ended September 30, 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		31
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk		86
ITEM 4.	Controls and Procedures		86
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings		87
ITEM 1A.	Risk Factors		87
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds		87
ITEM 3.	Defaults Upon Senior Securities		87
ITEM 4.	Mine Safety Disclosures		87
ITEM 5.	Other Information		87
ITEM 6.	Exhibits		88
SIGNATURES			89

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)

	September 30, 2014			December 31, 2013
ASSETS
Real estate, at cost	$	18,362,993		$	17,158,210
Construction in progress		715,609			1,523,179
Land held for future development		276,804			297,376
Less: accumulated depreciation		(3,469,130	)		(3,161,571	)
Total real estate		15,886,276			15,817,194
Cash and cash equivalents		846,664			2,365,137
Cash held in escrows		153,161			57,201
Investments in securities		18,834			16,641
Tenant and other receivables (net of allowance for doubtful accounts of $1,080 and $1,636, respectively)		43,210			59,464
Accrued rental income (net of allowance of $7,397 and $3,636, respectively)		689,885			651,603
Deferred charges, net		837,907			884,450
Prepaid expenses and other assets		219,074			184,477
Investments in unconsolidated joint ventures		180,149			126,084
Total assets	$	18,875,160		$	20,162,251
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable	$	4,328,464		$	4,449,734
Unsecured senior notes (net of discount of $12,828 and $14,146, respectively)		5,837,172			5,835,854
Unsecured exchangeable senior notes (net of discount of $0 and $182, respectively)		—			744,880
Unsecured line of credit		—			—
Mezzanine notes payable		310,114			311,040
Outside members’ notes payable		180,000			180,000
Accounts payable and accrued expenses		253,600			202,470
Dividends and distributions payable		112,708			497,242
Accrued interest payable		181,954			167,523
Other liabilities		517,428			578,969
Total liabilities		11,721,440			12,967,712
Commitments and contingencies		—			—
Noncontrolling interests:
Redeemable preferred units of the Operating Partnership		2,022			51,312
Redeemable interest in property partnership		104,105			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 September 30, 2014 and December 31, 2013		200,000			200,000
Common stock, $.01 par value, 250,000,000 shares authorized, 153,178,686 and 153,062,001 issued and 153,099,786 and 152,983,101 outstanding at September 30, 2014 and December 31, 2013, respectively		1,531			1,530
Additional paid-in capital		5,684,649			5,662,453
Dividends in excess of earnings		(148,566	)		(108,552	)
Treasury common stock at cost, 78,900 shares at September 30, 2014 and December 31, 2013		(2,722	)		(2,722	)
Accumulated other comprehensive loss		(9,866	)		(11,556	)
Total stockholders’ equity attributable to Boston Properties, Inc.		5,725,026			5,741,153
Noncontrolling interests:
Common units of the Operating Partnership		606,002			576,333
Property partnerships		716,565			726,132
Total equity		7,047,593			7,043,618
Total liabilities and equity	$	18,875,160		$	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 September 30,						Nine months ended September 30,
	2014			2013			2014			2013
	(in thousands, except for per share amounts)
Revenue
Rental
Base rent	$	484,071		$	449,636		$	1,402,328		$	1,221,874
Recoveries from tenants		90,103			80,718			253,419			213,358
Parking and other		26,236			25,000			76,869			71,984
Total rental revenue		600,410			555,354			1,732,616			1,507,216
Hotel revenue		11,918			10,652			32,478			30,061
Development and management services		6,475			5,475			18,197			22,063
Total revenue		618,803			571,481			1,783,291			1,559,340
Expenses
Operating
Rental		215,179			199,288			624,213			544,368
Hotel		7,585			6,580			21,697			20,959
General and administrative		22,589			24,841			75,765			94,673
Transaction costs		1,402			766			2,500			1,744
Impairment loss		—			—			—			8,306
Depreciation and amortization		157,245			153,253			466,143			406,162
Total expenses		404,000			384,728			1,190,318			1,076,212
Operating income		214,803			186,753			592,973			483,128
Other income (expense)
Income from unconsolidated joint ventures		4,419			14,736			10,069			72,240
Gains on consolidation of joint ventures		—			(1,810	)		—			385,991
Interest and other income		3,421			3,879			6,841			6,646
Gains (losses) from investments in securities		(297	)		956			651			1,872
Gains (losses) from early extinguishments of debt		—			(30	)		—			122
Interest expense		(113,308	)		(122,173	)		(337,839	)		(325,746	)
Income from continuing operations		109,038			82,311			272,695			624,253
Discontinued operations
Income from discontinued operations		—			1,677			—			7,486
Gain on sale of real estate from discontinued operations		—			86,448			—			86,448
Gain on forgiveness of debt from discontinued operations		—			—			—			20,182
Impairment loss from discontinued operations		—			—			—			(3,241	)
Income before gains on sales of real estate		109,038			170,436			272,695			735,128
Gains on sales of real estate		41,937			—			41,937			—
Net income		150,975			170,436			314,632			735,128
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(5,566	)		3,279			(17,473	)		924
Noncontrolling interest—redeemable preferred units of the Operating Partnership		(75	)		(1,082	)		(1,014	)		(3,385	)
Noncontrolling interest—common units of the Operating Partnership		(14,963	)		(8,339	)		(29,819	)		(62,945	)
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		—			(8,970	)		—			(11,450	)
Net income attributable to Boston Properties, Inc.		130,371			155,324			266,326			658,272
Preferred dividends		(2,647	)		(2,647	)		(7,854	)		(5,411	)
Net income attributable to Boston Properties, Inc. common shareholders	$	127,724		$	152,677		$	258,472		$	652,861
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$	0.83		$	0.48		$	1.69		$	3.62
Discontinued operations		—			0.52			—			0.65
Net income	$	0.83		$	1.00		$	1.69		$	4.27
Weighted average number of common shares outstanding		153,120			152,407			153,077			152,000
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$	0.83		$	0.48		$	1.69		$	3.61
Discontinued operations		—			0.52			—			0.65
Net income	$	0.83		$	1.00		$	1.69		$	4.26
Weighted average number of common and common equivalent shares outstanding		153,273			152,692			153,228			152,381

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 September 30,						Nine months ended September 30,
	2014			2013			2014			2013
	(in thousands)
Net income	$	150,975		$	170,436		$	314,632		$	735,128
Other comprehensive income:
Amortization of interest rate contracts(1)		628			629			1,881			1,884
Other comprehensive income		628			629			1,881			1,884
Comprehensive income		151,603			171,065			316,513			737,012
Net income attributable to noncontrolling interests		(20,604	)		(15,112	)		(48,306	)		(76,856	)
Other comprehensive income attributable to noncontrolling interests		(65	)		(62	)		(191	)		(189	)
Comprehensive income attributable to Boston Properties, Inc.	$	130,934		$	155,891		$	268,016		$	659,967

(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		70		1		—		2,367			—			—			—			(2,368	)		—
Conversion of redeemable preferred units to common units		—		—		—		—			—			—			—			33,306			33,306
Allocated net income for the year		—		—		—		—			266,326			—			—			38,496			304,822
Dividends/distributions declared		—		—		—		—			(306,340	)		—			—			(34,426	)		(340,766	)
Shares issued pursuant to stock purchase plan		7		—		—		761			—			—			—			—			761
Net activity from stock option and incentive plan		40		—		—		5,177			—			—			—			17,038			22,215
Contributions from noncontrolling interests in property partnerships		—		—		—		—			—			—			—			2,980			2,980
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(21,224	)		(21,224	)
Amortization of interest rate contracts		—		—		—		—			—			—			1,690			191			1,881
Reallocation of noncontrolling interest		—		—		—		13,891			—			—			—			(13,891	)		—
Equity, September 30, 2014		153,100	$	1,531	$	200,000	$	5,684,649		$	(148,566	)	$	(2,722	)	$	(9,866	)	$	1,322,567		$	7,047,593
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		337		4		—		10,402			—			—			—			(10,406	)		—
Allocated net income for the year		—		—		—		—			658,272			—			—			68,445			726,717
Dividends/distributions declared		—		—		—		—			(302,081	)		—			—			(33,956	)		(336,037	)
Issuance of 5.25% Series B cumulative redeemable preferred stock		—		—		200,000		(6,377	)		—			—			—			—			193,623
Shares issued in connection with exchange of Exchangeable Senior Notes		419		4		—		43,830			—			—			—			—			43,834
Equity component of exchange of Exchangeable Senior Notes		—		—		—		(43,869	)		—			—			—			—			(43,869	)
Shares issued pursuant to stock purchase plan		6		—		—		681			—			—			—			—			681
Net activity from stock option and incentive plan		28		—		—		6,510			—			—			—			24,122			30,632
Noncontrolling interests in property partnerships recorded upon consolidation		—		—		—		—			—			—			—			480,861			480,861
Contributions from noncontrolling interests in property partnerships		—		—		—		—			—			—			—			10,932			10,932
Distributions to noncontrolling interests in property partnerships		—		—		—		—			—			—			—			(2,250	)		(2,250	)
Amortization of interest rate contracts		—		—		—		—			—			—			1,695			189			1,884
Reallocation of noncontrolling interest		—		—		—		16,924			—			—			—			(16,924	)		—
Equity, September 30, 2013		152,391	$	1,524	$	200,000	$	5,250,174		$	246,206		$	(2,722	)	$	(12,122	)	$	1,058,802		$	6,741,862

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

4

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the nine months ended September 30,
	2014			2013
	(in thousands)
Cash flows from operating activities:
Net income	$	314,632		$	735,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		466,143			409,988
Non-cash compensation expense		22,708			39,001
Impairment loss		—			8,306
Income from unconsolidated joint ventures		(10,069	)		(72,240	)
Gains on consolidation of joint ventures		—			(385,991	)
Distributions of net cash flow from operations of unconsolidated joint ventures		3,130			29,607
Gains from investments in securities		(651	)		(1,872	)
Non-cash portion of interest expense		(28,753	)		29,149
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes		(92,979	)		(56,532	)
Gains from early extinguishments of debt		—			(264	)
Gains on sales of real estate		(41,937	)		—
Gain on sale of real estate from discontinued operations		—			(86,448	)
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		3,957			4,017
Tenant and other receivables, net		16,254			3,628
Accrued rental income, net		(42,180	)		(44,636	)
Prepaid expenses and other assets		(34,804	)		(41,245	)
Accounts payable and accrued expenses		4,237			9,179
Accrued interest payable		14,431			35,089
Other liabilities		(60,795	)		(9,352	)
Tenant leasing costs		(63,647	)		(37,150	)
Total adjustments		155,045			(184,707	)
Net cash provided by operating activities		469,677			550,421
Cash flows from investing activities:
Acquisitions of real estate		—			(522,900	)
Construction in progress		(305,192	)		(279,786	)
Building and other capital improvements		(57,329	)		(46,805	)
Tenant improvements		(80,692	)		(78,462	)
Proceeds from the sales of real estate		103,542			160,815
Proceeds from sales of real estate placed in escrow		(99,917	)		—
Cash recorded upon consolidation		—			79,468
Repayments of notes receivable, net		—			12,491
Capital contributions to unconsolidated joint ventures		(47,767	)		—
Capital distributions from unconsolidated joint ventures		641			223,067
Investments in securities, net		(1,542	)		(1,333	)
Net cash used in investing activities		(488,256	)		(453,445	)

5

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the nine months ended September 30,
	2014			2013
	(in thousands)
Cash flows from financing activities:
Repayments of mortgage notes payable		(82,030	)		(96,750	)
Proceeds from unsecured senior notes		—			1,194,753
Repayment/redemption of unsecured exchangeable senior notes		(654,521	)		(393,468	)
Deferred financing costs		(31	)		(15,180	)
Net proceeds from preferred stock issuance		—			193,623
Net proceeds from equity transactions		1,530			(348	)
Redemption of preferred units		(15,984	)		(43,070	)
Dividends and distributions		(726,314	)		(337,440	)
Contributions from noncontrolling interests in property partnerships		2,980			6,386
Distributions to noncontrolling interests in property partnerships		(25,524	)		(6,185	)
Net cash provided by (used in) financing activities		(1,499,894	)		502,321
Net increase (decrease) in cash and cash equivalents		(1,518,473	)		599,297
Cash and cash equivalents, beginning of period		2,365,137			1,041,978
Cash and cash equivalents, end of period	$	846,664		$	1,641,275
Supplemental disclosures:
Cash paid for interest	$	489,949		$	368,652
Interest capitalized	$	44,809		$	50,252
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	$	20,016		$	6,397
Real estate and related intangibles recorded upon consolidation	$	—		$	3,356,000
Debt recorded upon consolidation	$	—		$	2,056,000
Working capital recorded upon consolidation	$	—		$	170,748
Noncontrolling interests recorded upon consolidation	$	—		$	480,861
Investment in unconsolidated joint venture eliminated upon consolidation	$	—		$	361,808
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	$	112,708		$	112,470
Issuance of common stock in connection with the exchange of exchangeable senior notes	$	—		$	43,834
Conversions of noncontrolling interests to stockholders’ equity	$	2,368		$	10,406
Conversions of redeemable preferred units to common units	$	33,306		$	—
Issuance of restricted securities to employees	$	27,445		$	30,077

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 September 30, 2014 owned an approximate 89.5% (89.2% at September 30, 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 Notes 8 and 11). 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 8 and 11).

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 9).

At September 30, 2014, there were two series of Preferred Units outstanding (i.e., Series Four Preferred Units and Series B Preferred Units).

• The Series Four Preferred Units are not convertible into or exchangeable for any security 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 Notes 8 and 13).

• 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 9).

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.

7

Properties

At September 30, 2014, the Company owned or had interests in a portfolio of 172 commercial real estate properties (the “Properties”) aggregating approximately 46.4 million net rentable square feet, including ten properties under construction totaling approximately 3.3 million net rentable square feet. In addition, the Company has structured parking for approximately 45,835 vehicles containing approximately 15.7 million square feet. At September 30, 2014, the Properties consist of:

• 163 office properties, including 132 Class A office properties (including nine properties under construction) and 31 Office/Technical properties;

• one hotel;

• five retail properties (including one property under construction); and

• three residential properties.

The Company owns or controls undeveloped land parcels totaling approximately 492.1 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 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. 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 12).

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

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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 September 30, 2014 and December 31, 2013 (in thousands):

	September 30, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,328,464	$	4,460,353	$	4,449,734		$	4,545,283
Mezzanine notes payable		310,114		310,141		311,040			311,064
Unsecured senior notes		5,837,172		6,173,499		5,835,854			6,050,517
Unsecured exchangeable senior notes		—		—		744,880	(1)		750,266
Total	$	10,475,750	$	10,943,993	$	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.

Out-of-Period Adjustment

During the nine months ended September 30, 2014, the Company recorded an allocation of net income to the noncontrolling interest holder in its Fountain Square consolidated joint venture totaling approximately $1.9 million related to the cumulative non-cash adjustment to the accretion of the changes in the redemption value of the noncontrolling interest. This resulted in the overstatement of Noncontrolling Interests in Property Partnerships by approximately $1.9 million during the nine months ended September 30, 2014 and an understatement of Noncontrolling Interests in Property Partnerships in the aggregate amount of approximately $1.9 million in previous periods prior to 2014. Because this adjustment was not material to the prior periods’ consolidated financial statements and the impact of recording the adjustment in 2014 was not material to the Company’s consolidated financial statements, the Company recorded the related adjustment during the nine months ended September 30, 2014. The out of period adjustment was identified and recorded during the second quarter of 2014.

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

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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.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contract with Customers (Topic 606)” (“ASU 2014-09”). The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying ASU 2014-09, companies will perform a five-step analysis of transactions to determine when and how revenue is recognized. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB’s Accounting Standards Codification (“ASC”). ASU 2014-09 is effective for annual reporting periods (including interim periods within that reporting period) beginning after December 15, 2016 and shall be applied using either a full retrospective or modified retrospective approach. Early adoption is not permitted. The Company is currently assessing the potential impact that the adoption of ASU 2014-09 will have on its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period” (“ASU 2014-12”). The amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in ASC Topic No. 718, “Compensation—Stock Compensation” (“ASC 718”), as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in ASU 2014-12 either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Company does not expect the adoption of ASU 2014-12 to have a material impact on its consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern” (“ASU 2014-15”). ASU 2014-15 requires an entity to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or within one year after the financial statements are available to be issued when applicable) and to provide related footnote disclosures in certain circumstances. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter with early adoption permitted. The Company does not expect the adoption of ASU 2014-15 to have a material impact on its consolidated financial statements.

3. Real Estate Activity During the Nine Months Ended September 30, 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.

On April 1, 2014, the Company commenced construction of its 99 Third Avenue development project totaling approximately 17,000 net rentable square feet of retail space located in Waltham, Massachusetts.

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On April 3, 2014, the Company commenced construction of its 690 Folsom Street development project totaling approximately 26,000 net rentable square feet of office and retail space located in San Francisco, California.

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 commenced construction of the building.

On May 20, 2014, the Company commenced construction of its 888 Boylston Street development project totaling approximately 425,000 net rentable square feet of Class A office space located in Boston, Massachusetts.

On May 20, 2014, the Company commenced construction of its 10 CityPoint development project totaling approximately 245,000 net rentable square feet of Class A office space located in Waltham, Massachusetts.

On August 31, 2014, the Company completed and fully placed in-service 250 West 55th Street, a Class A office project with approximately 988,000 net rentable square feet located in New York City.

On September 17, 2014, the Company completed and fully placed in-service 680 Folsom Street, a Class A office project with approximately 525,000 net rentable square feet located in San Francisco, California.

Dispositions

On June 11, 2014, the Company entered into a contract for the sale of its Patriots Park properties located in Reston, Virginia for a sale price of $321.0 million, which exceeds the carrying value at September 30, 2014. Patriots Park consists of three Class A office properties aggregating approximately 706,000 net rentable square feet (See Note 13).

On July 29, 2014, the Company completed the sale of its Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

On August 20, 2014, a portion of the land parcel at the Company’s One Reston Overlook property located in Reston, Virginia was taken by eminent domain. Net cash proceeds totaled approximately $2.6 million, resulting in a gain on sale of real estate totaling approximately $1.2 million.

On August 22, 2014, the Company completed the sale of a parcel of land within its Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

On September 16, 2014, the Company entered into a binding purchase and sale agreement to sell a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston for an aggregate gross sales price of approximately $1.827 billion in cash, less the partner’s pro rata share of the indebtedness secured by 601 Lexington Avenue, subject to certain prorations and adjustments. In connection with the sale, the Company will form a joint venture for each property with the buyer and provide

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customary property management and leasing services to the joint ventures. 601 Lexington Avenue is a 1,669,000 square foot Class A office complex located in Midtown Manhattan. The property consists of a 59-story tower as well as a six-story low-rise office and retail building. The property is subject to existing mortgage indebtedness of approximately $712.9 million. The Atlantic Wharf Office Building is a 791,000 square foot Class A office tower located on Boston’s Waterfront. 100 Federal Street is a 1,323,000 square foot Class A office tower located in Boston’s Financial District. The transaction will not qualify as a sale of real estate for financial reporting purposes as the Company will continue to control the joint ventures and will therefore continue to account for the properties on a consolidated basis in its financial statements (See Note 13).

The Company did not have any dispositions during the three and nine months ended September 30, 2014 that qualified for discontinued operations presentation. The following table summarizes the income from discontinued operations for the three and nine months ended September 30, 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 sale of real estate, gain on forgiveness of debt and impairment loss:

	For the three months ended September 30, 2013			For the nine months ended September 30, 2013
	(in thousands)
Total revenue	$	4,112		$	17,962
Expenses
Operating		1,495			6,290
Depreciation and amortization		940			3,826
Total expenses		2,435			10,116
Operating income		1,677			7,846
Other expense
Interest expense		—			360
Income from discontinued operations	$	1,677		$	7,486
Noncontrolling interest in income from discontinued operations—common units of the Operating Partnership		(167	)		(752	)
Income from discontinued operations attributable to Boston Properties, Inc.	$	1,510		$	6,734
Gain on sale of real estate from discontinued operations	$	86,448		$	86,448
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		(8,803	)		(10,698	)
Gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	77,645		$	92,691

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4. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at September 30, 2014:

Entity	Properties	Nominal % Ownership			Carrying Value of Investment
					(in thousands)
Square 407 Limited Partnership	Market Square North		50.0	%	$	(8,540	)
The Metropolitan Square Associates LLC	Metropolitan Square		51.0	%		8,343
BP/CRF 901 New York Avenue LLC	901 New York Avenue		25.0	%(1)		(1,436	)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure		33.3	%(2)		46,011
Annapolis Junction NFM, LLC	Annapolis Junction		50.0	%(3)		24,484
2 GCT Venture LLC	N/A		60.0	%(4)		424
540 Madison Venture LLC	540 Madison Avenue		60.0	%		70,418
500 North Capitol LLC	500 North Capitol Street, NW		30.0	%		(1,467	)
501 K Street LLC	501 K Street		50.0	%(5)		41,912
					$	180,149

(1) The Company’s economic ownership has increased 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 joint venture owns two in-service buildings, two buildings under construction and two undeveloped land parcels.

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

(5) Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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:

	September 30, 2014			December 31, 2013
	(in thousands)
ASSETS
Real estate and development in process, net	$	1,014,663		$	924,297
Other assets		182,905			163,149
Total assets	$	1,197,568		$	1,087,446
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	753,692		$	749,732
Other liabilities		23,180			28,830
Members’/Partners’ equity		420,696			308,884
Total liabilities and members’/partners’ equity	$	1,197,568		$	1,087,446
Company’s share of equity	$	208,125		$	154,726
Basis differentials(1)		(27,976	)		(28,642	)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	180,149		$	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 September 30,					For the nine months ended September 30,
	2014		2013			2014		2013
	(in thousands)
Total revenue(1)	$	41,958	$	37,983		$	118,429	$	273,464
Expenses
Operating		15,516		14,963			46,441		89,826
Depreciation and amortization		9,429		9,784			27,688		76,202
Total expenses		24,945		24,747			74,129		166,028
Operating income		17,013		13,236			44,300		107,436
Other expense
Interest expense		7,950		8,148			23,946		104,436
Losses from early extinguishment of debt		—		—			—		1,677
Income from continuing operations		9,063		5,088			20,354		1,323
Gains on sales of real estate		—		12,441			—		14,207
Net income	$	9,063	$	17,529		$	20,354	$	15,530
Company’s share of net income	$	4,200	$	3,149		$	9,403	$	1,974
Gains on sales of real estate		—		11,174			—		54,501
Basis differential		219		413			666		(1,213	)
Elimination of inter-entity interest on partner loan		—		—			—		16,978
Income from unconsolidated joint ventures	$	4,419	$	14,736		$	10,069	$	72,240
Gains on consolidation of joint ventures	$	—	$	(1,810	)	$	—	$	385,991

(1) Includes straight-line rent adjustments of $0.2 million and $0.6 million for the three months ended September 30, 2014 and 2013, respectively, and $1.1 million and $7.6 million for the nine months ended September 30, 2014 and 2013, respectively. Includes net below-market rent adjustments of $(0.1) million and $(0.1) million for the three months ended September 30, 2014 and 2013, respectively, and $(0.1) million and $33.9 million for the nine months ended September 30, 2014 and 2013, respectively.

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 a 50% interest in the joint venture and the Company contributed cash of approximately $39.0 million for its 50% interest. Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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 to the joint venture. 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

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approximately 125,000 net rentable square feet located in Annapolis, Maryland. In addition, on June 23, 2014, the joint venture obtained construction financing collateralized by the development project totaling $26.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.50% per annum and matures on June 23, 2017, with two, one-year extension options, subject to certain conditions.

5. Mortgage Notes Payable

On July 1, 2014, the Company used available cash to repay the mortgage loan collateralized by its New Dominion Technology Park Building Two property located in Herndon, Virginia totaling $63.0 million. The mortgage loan bore interest at a fixed rate of 5.55% per annum and was scheduled to mature on October 1, 2014. There was no prepayment penalty.

6. 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.

7. 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 $19.1 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 8). Under certain of the Company’s joint venture agreements, if certain return thresholds are achieved the partners will be entitled to an additional promoted interest or payments.

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 September 30, 2014, the maximum funding obligation under the guarantee was approximately $14.8 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 $28.8 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.

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In 2009, the Company filed a general unsecured creditor’s claim against Lehman Brothers, Inc. for approximately $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 the business of Lehman Brothers allowed the Company’s claim in the amount of approximately $45.2 million. On September 18, 2014, the Company received an initial distribution totaling approximately $7.7 million, which is included in Base Rent in the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2014, leaving a remaining claim of approximately $37.5 million. Recently, claims of similar priority to that of the Company’s remaining claim were quoted privately within a range of $0.25 to $0.26 per $1.00. The Company will continue to evaluate whether to attempt to sell the remaining claim or wait until the trustee distributes proceeds from the Lehman estate. Given the inherent uncertainties in bankruptcy proceedings, there can be no assurance as to the timing or amount of proceeds, if any, that the Company may ultimately realize on the remaining claim, whether by sale to a third party or by one or more distributions from the trustee. Accordingly, the Company has not recorded any estimated recoveries associated with this gain contingency within its consolidated financial statements at September 30, 2014.

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. Through June 9, 2014, $1.375 billion of the Terrorism Coverage for 767 Fifth Avenue in excess of $250 million was provided by NYXP, LLC (“NYXP”), as a direct insurer. After June 9, 2014, all of the Terrorism Coverage for 767 Fifth Avenue has been provided by third party insurers. 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 $1.625 billion property insurance program for 767 Fifth Avenue will continue to provide Terrorism Coverage through the expiration of the program on June 9, 2015, (iii) the Company will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (iv) if such insurance is not available at commercially reasonable rates

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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, (v) the Company may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (vi) the Company may not be able to obtain future debt financings secured by individual properties and (vii) the Company may cancel the insurance policies issued by IXP for the NBCR Coverage. 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 is 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 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 Salesforce Tower in San Francisco includes a $60 million per occurrence and annual aggregate limit of earthquake coverage (increased from $15 million on July 29, 2014). 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, acted as a direct insurer with respect to a portion of the Company’s Terrorism Coverage for 767 Fifth Avenue through June 9, 2014. NYXP only insured losses which exceeded the program trigger under TRIA and NYXP reinsured 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.

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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.

8. 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 September 30, 2014, the noncontrolling interests in the Operating Partnership consisted of 16,456,297 OP Units, 1,505,386 LTIP Units, 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units, 483,555 2014 MYLTIP Units and 40,440 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

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 elected to convert such units into 1.312336 OP Units, or an aggregate of 874,168 OP Units, on or before May 12, 2014. As of May 12, 2014, the holders of all remaining 666,116 Series Two Preferred Units converted such units into an aggregate of 874,168 OP Units. The Series Two Preferred Units bore 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 were convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). In connection with the conversion of the remaining Series Two Preferred Units in May 2014, the Operating Partnership paid accrued and unpaid distributions which included the special cash distribution on an as-converted basis. On February 18, 2014, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. Due to the holders’ redemption option existing outside the control of the Company, the Series Two Preferred Units were presented outside of permanent equity in the Company’s Consolidated Balance Sheets.

The Preferred Units at September 30, 2014 consisted of 40,440 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. 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. In order to secure the performance of certain post-issuance obligations by the holders, all of such outstanding Series Four Preferred Units were subject to forfeiture pursuant to the terms of a pledge agreement and not eligible for redemption until and unless such security interest is released. On May 19, 2014, the Company’s Operating Partnership released to the holders 319,687 Series Four Preferred Units that were previously subject to the security interest. On July 3, 2014, the Company’s Operating Partnership redeemed such units for cash totaling approximately $16.0 million, plus accrued and unpaid distributions. An aggregate of 40,440 Series Four Preferred Units remain outstanding and subject to the security interest under the pledge agreement (See Note 13). 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.

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On February 18, 2014, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On May 15, 2014, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On August 15, 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 nine months ended September 30, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	51,312
Net income		1,014
Distributions		(1,014	)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units		(33,306	)
Redemption of redeemable preferred units (Series Four Preferred Units)		(15,984	)
Balance at September 30, 2014	$	2,022
Balance at January 1, 2013	$	110,876
Net income		3,385
Distributions		(3,385	)
Redemption of redeemable preferred units (Series Four Preferred Units)		(43,070	)
Balance at September 30, 2013	$	67,806

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 nine months ended September 30, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	99,609
Net loss		(519	)
Distributions		(4,300	)
Adjustment to reflect redeemable interest at redemption value		9,315	(1)
Balance at September 30, 2014	$	104,105
Balance at January 1, 2013	$	97,558
Net loss		(1,523	)
Distributions		(3,935	)
Adjustment to reflect redeemable interest at redemption value		6,549
Balance at September 30, 2013	$	98,649

(1) Includes an out-of-period adjustment totaling approximately $1.9 million (See Note 2).

Noncontrolling Interest—Common Units of the Operating Partnership

During the nine months ended September 30, 2014, 70,422 OP Units were presented by the holders for redemption (including 67,368 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 September 30, 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. As a result, the Company accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million during the nine months ended September 30, 2014. 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 quarterly cash distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a regular quarterly 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. On April 30, 2014, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on March 31, 2014. On July 31, 2014, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2012 OPP Units, 2013 MYLTIP Units and

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2014 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on June 30, 2014. On September 11, 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 October 31, 2014 to holders of record as of the close of business on September 30, 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) had all of such units been redeemed at September 30, 2014 was approximately $2.1 billion based on the closing price of the Company’s common stock of $115.76 per share on September 30, 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 $716.6 million at September 30, 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

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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.

9. Stockholders’ Equity

As of September 30, 2014, the Company had 153,099,786 shares of Common Stock outstanding.

On June 3, 2014, the Company established a new “at the market” (ATM) stock offering program through which it may sell from time to time up to an aggregate of $600.0 million of its common stock through sales agents over a three-year period. This program replaced the Company’s prior $600.0 million ATM stock offering program that expired on June 2, 2014 with approximately $305.3 million of unsold common stock. The Company intends to use the net proceeds from any offering for general business purposes, which may include investment opportunities and debt reduction. No shares of common stock have been issued under this new ATM stock offering program.

During the nine months ended September 30, 2014, the Company issued 70,422 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from third parties.

During the nine months ended September 30, 2014, the Company issued 17,124 shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees.

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 April 30, 2014, the Company paid a dividend of $0.65 per share of Common Stock to shareholders of record as of the close of business on March 31, 2014. On July 31, 2014, the Company paid a dividend of $0.65 per share of Common Stock to shareholders of record as of the close of business on June 30, 2014. On September 11, 2014, the Company’s Board of Directors declared a dividend of $0.65 per share of Common Stock payable on October 31, 2014 to shareholders of record as of the close of business on September 30, 2014.

As of September 30, 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 pays 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 May 15, 2014, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On August 15, 2014, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On September 11, 2014, the Company’s Board of Directors declared a dividend of $32.8125 per share of Series B Preferred Stock payable on November 17, 2014 to shareholders of record as of the close of business on November 5, 2014.

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10. 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 September 30, 2014
	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.	$	127,724			153,120	$	0.83
Allocation of undistributed earnings to participating securities		(63	)		—		—
Net income attributable to Boston Properties, Inc. common shareholders	$	127,661			153,120	$	0.83
Effect of Dilutive Securities:
Stock Based Compensation		—			153		—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	127,661			153,273	$	0.83

	For the three months ended September 30, 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.	$	73,522			152,407	$	0.48
Discontinued operations attributable to Boston Properties, Inc.		79,155			—		0.52
Allocation of undistributed earnings to participating securities		(586	)		—		—
Net income attributable to Boston Properties, Inc. common shareholders	$	152,091			152,407	$	1.00
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			285		—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	152,091			152,692	$	1.00

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	For the nine months ended September 30, 2014
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	258,472		153,077	$	1.69
Effect of Dilutive Securities:
Stock Based Compensation		—		151		—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	258,472		153,228	$	1.69

	For the nine months ended September 30, 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.	$	553,436			152,000	$	3.64
Discontinued operations attributable to Boston Properties, Inc.		99,425			—		0.65
Allocation of undistributed earnings to participating securities		(3,762	)		—		(0.02	)
Net income attributable to Boston Properties, Inc. common shareholders	$	649,099			152,000	$	4.27
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			381		(0.01	)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	649,099			152,381	$	4.26

11. 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

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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 FASB’s 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. As a result, the Company accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million during the nine months ended September 30, 2014. Accordingly, all 2011 OPP Unit awards were automatically forfeited.

During the nine months ended September 30, 2014, the Company issued 23,968 shares of restricted common stock, no non-qualified stock options, 127,094 LTIP Units and 485,459 2014 MYLTIP Units to employees and non-employee directors under the 2012 Plan. Employees and non-employee directors 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 nine months ended September 30, 2014 were valued at approximately $2.6 million ($109.27 per share weighted-average). The LTIP Units granted were valued at approximately $12.8 million ($100.61 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 $5.0 million and $6.2 million for the three months ended September 30, 2014 and 2013, respectively, and approximately $21.0 million and $38.1 million for the nine months ended September 30, 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 and nine months ended September 30, 2013, stock-based compensation expense includes approximately $1.6 million and $20.2 million, respectively, 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 September 30, 2014, there was $19.7 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $16.5 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 2.9 years.

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12. 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. Therefore, the operations for the Princeton region have been included in the New York region. Accordingly, amounts reflected below for the New York region have been adjusted to reflect the Company’s retrospective inclusion of the Princeton region 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 (losses) from investments in securities, gains (losses) from early extinguishments of debt, income from unconsolidated joint ventures, gains on consolidation of joint ventures, discontinued operations, gains on sales of real estate 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. The Company’s management also uses Net Operating Income to evaluate regional property level performance and to make decisions about resource allocations. Further, the Company believes Net Operating Income is useful to investors as a performance measure because, when compared across periods, Net Operating Income 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.

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 September 30, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	176,788		$	243,033		$	61,691		$	96,219		$	577,731
Office/Technical		6,056			—			5,892			3,713			15,661
Residential		1,137			—			—			5,881			7,018
Hotel		11,918			—			—			—			11,918
Total		195,899			243,033			67,583			105,813			612,328
% of Grand Totals		31.99	%		39.69	%		11.04	%		17.28	%		100.00	%
Rental Expenses:
Class A Office		69,026			82,335			22,484			32,898			206,743
Office/Technical		1,901			—			1,363			1,009			4,273
Residential		509			—			—			3,654			4,163
Hotel		7,585			—			—			—			7,585
Total		79,021			82,335			23,847			37,561			222,764
% of Grand Totals		35.47	%		36.96	%		10.71	%		16.86	%		100.00	%
Net operating income	$	116,878		$	160,698		$	43,736		$	68,252		$	389,564
% of Grand Totals		30.00	%		41.25	%		11.23	%		17.52	%		100.00	%

For the three months ended September 30, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	170,415		$	214,086		$	53,841		$	96,141		$	534,483
Office/Technical		5,662			—			5,839			3,877			15,378
Residential		1,125			—			—			4,368			5,493
Hotel		10,652			—			—			—			10,652
Total		187,854			214,086			59,680			104,386			566,006
% of Grand Totals		33.19	%		37.83	%		10.54	%		18.44	%		100.00	%
Rental Expenses:
Class A Office		67,228			73,355			20,006			31,678			192,267
Office/Technical		1,763			—			1,287			1,064			4,114
Residential		466			—			—			2,441			2,907
Hotel		6,580			—			—			—			6,580
Total		76,037			73,355			21,293			35,183			205,868
% of Grand Totals		36.94	%		35.63	%		10.34	%		17.09	%		100.00	%
Net operating income	$	111,817		$	140,731		$	38,387		$	69,203		$	360,138
% of Grand Totals		31.05	%		39.08	%		10.66	%		19.21	%		100.00	%

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For the nine months ended September 30, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	520,857		$	684,240		$	173,749		$	287,489		$	1,666,335
Office/Technical		17,788			—			18,451			11,044			47,283
Residential		3,389			—			—			15,609			18,998
Hotel		32,478			—			—			—			32,478
Total		574,512			684,240			192,200			314,142			1,765,094
% of Grand Totals		32.55	%		38.76	%		10.89	%		17.80	%		100.00	%
Rental Expenses:
Class A Office		206,242			231,668			63,078			98,818			599,806
Office/Technical		5,326			—			3,885			3,335			12,546
Residential		1,501			—			—			10,360			11,861
Hotel		21,697			—			—			—			21,697
Total		234,766			231,668			66,963			112,513			645,910
% of Grand Totals		36.35	%		35.86	%		10.37	%		17.42	%		100.00	%
Net operating income	$	339,746		$	452,572		$	125,237		$	201,629		$	1,119,184
% of Grand Totals		30.36	%		40.43	%		11.19	%		18.02	%		100.00	%

For the nine months ended September 30, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	495,376		$	510,767		$	159,843		$	284,554		$	1,450,540
Office/Technical		16,853			—			11,317			11,951			40,121
Residential		3,257			—			—			13,298			16,555
Hotel		30,061			—			—			—			30,061
Total		545,547			510,767			171,160			309,803			1,537,277
% of Grand Totals		35.49	%		33.23	%		11.13	%		20.15	%		100.00	%
Rental Expenses:
Class A Office		195,206			177,800			58,036			94,145			525,187
Office/Technical		5,177			—			2,439			3,095			10,711
Residential		1,316			—			—			7,154			8,470
Hotel		20,959			—			—			—			20,959
Total		222,658			177,800			60,475			104,394			565,327
% of Grand Totals		39.38	%		31.45	%		10.70	%		18.47	%		100.00	%
Net operating income	$	322,889		$	332,967		$	110,685		$	205,409		$	971,950
% of Grand Totals		33.22	%		34.26	%		11.39	%		21.13	%		100.00	%

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

	Three months ended September 30,						Nine months ended September 30,
	2014			2013			2014		2013
	(in thousands)
Net Operating Income	$	389,564		$	360,138		$	1,119,184	$	971,950
Add:
Development and management services income		6,475			5,475			18,197		22,063
Income from unconsolidated joint ventures		4,419			14,736			10,069		72,240
Gains on consolidation of joint ventures		—			(1,810	)		—		385,991
Interest and other income		3,421			3,879			6,841		6,646
Gains (losses) from investments in securities		(297	)		956			651		1,872
Gains (losses) from early extinguishments of debt		—			(30	)		—		122
Income from discontinued operations		—			1,677			—		7,486
Gain on sale of real estate from discontinued operations		—			86,448			—		86,448
Gain on forgiveness of debt from discontinued operations		—			—			—		20,182
Gains on sales of real estate		41,937			—			41,937		—
Less:
General and administrative expense		22,589			24,841			75,765		94,673
Transaction costs		1,402			766			2,500		1,744
Depreciation and amortization expense		157,245			153,253			466,143		406,162
Interest expense		113,308			122,173			337,839		325,746
Impairment loss		—			—			—		8,306
Impairment loss from discontinued operations		—			—			—		3,241
Noncontrolling interest in property partnerships		5,566			(3,279	)		17,473		(924	)
Noncontrolling interest—redeemable preferred units of the Operating Partnership		75			1,082			1,014		3,385
Noncontrolling interest—common units of the Operating Partnership		14,963			8,339			29,819		62,945
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		—			8,970			—		11,450
Net income attributable to Boston Properties, Inc.	$	130,371		$	155,324		$	266,326	$	658,272

13. Subsequent Events

On October 2, 2014, the Company completed the sale of its Patriots Park properties located in Reston, Virginia for a gross sale price of $321.0 million, which exceeded the carrying value of the properties. Patriots Park consists of three Class A office properties aggregating approximately 706,000 net rentable square feet.

On October 16, 2014, the Company’s Operating Partnership released to the holders 27,773 Series Four Preferred Units that were previously subject to a security interest under a pledge agreement (See Note 8). On November 5, 2014, the Company’s Operating Partnership redeemed such units for cash totaling approximately $1.4 million. An aggregate of 12,667 Series Four Preferred Units remain outstanding and subject to the security interest under the pledge agreement.

On October 22, 2014, MIT exercised its right to purchase the Company’s 415 Main Street property (formerly Seven Cambridge Center) located in Cambridge, Massachusetts on February 1, 2016 for approximately $106 million. As part of its lease signed on July 14, 2004, MIT was granted a fixed price option to purchase the

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building at the beginning of the 11th lease year. 415 Main Street is an Office/Technical property with approximately 231,000 net rentable square feet occupied by the Broad Institute. The sale is subject to the satisfaction of customary closing conditions and there can be no assurance that the sale will be consummated on the terms currently contemplated or at all.

On October 24, 2014, the Company completed the sale of a parcel of land at 130 Third Avenue in Waltham, Massachusetts that is permitted for 129,000 square feet for a sale price of approximately $14.3 million, which exceeded the carrying value of the property.

On October 24, 2014, a joint venture in which the Company has a 50% interest extended the loan collateralized by its Annapolis Junction Building Six property. At the time of the extension, the outstanding balance of the construction loan totaled approximately $13.9 million and bore interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on November 17, 2014. The extended loan has a total commitment amount of $16.4 million, bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on November 17, 2015. Annapolis Junction Building Six is a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

On October 30, 2014, the Company completed the sale of a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston for an aggregate gross sales price of approximately $1.827 billion in cash, less the partner’s pro rata share of the indebtedness secured by 601 Lexington Avenue, subject to certain prorations and adjustments. In connection with the sale, the Company formed a joint venture for each property with the buyer and will provide customary property management and leasing services to the joint ventures. 601 Lexington Avenue is a 1,669,000 square foot Class A office complex located in Midtown Manhattan. The property consists of a 59-story tower as well as a six-story low-rise office and retail building. The property is subject to existing mortgage indebtedness of approximately $712.9 million. The Atlantic Wharf Office Building is a 791,000 square foot Class A office tower located on Boston’s Waterfront. 100 Federal Street is a 1,323,000 square foot Class A office tower located in Boston’s Financial District. The transaction did not qualify as a sale of real estate for financial reporting purposes as the Company continues to control the joint ventures and will therefore continue to account for the properties on a consolidated basis in its financial statements.

On November 1, 2014, the Company partially placed in-service 535 Mission Street, a Class A office project with approximately 307,000 net rentable square feet located in San Francisco, California.

On November 3, 2014, the Company’s Operating Partnership issued notices to redeem on December 15, 2014 (i) $300.0 million in aggregate principal amount of its 5.625% senior notes due 2015, which were scheduled to mature on April 15, 2015 (the “5.625% Notes”), and (ii) $250.0 million in aggregate principal amount of its 5.000% senior notes due 2015, which were scheduled to mature on June 1, 2015 (the “5.000% Notes”). The redemption price for each series of notes will equal the sum of (a) the present values as of the redemption date of the remaining scheduled payments of principal and interest from the redemption date to maturity (excluding any accrued and unpaid interest) discounted on a semi-annual basis at a rate equal to the yield to maturity of a comparable United States Treasury security plus (i) in the case of the 5.625% Notes, 0.35% or (ii) in the case of the 5.000% Notes, 0.25%, plus (b) accrued interest to, but excluding, December 15, 2014, as provided in the applicable indenture. The redemption price for each series of notes will be calculated three business days prior to the redemption date and will be payable on December 15, 2014 in accordance with the terms of the applicable indentures.

On November 6, 2014, the Company entered into an option agreement pursuant to which the Company has been granted an option to purchase real property located at 425 Fourth Street in San Francisco, California. In connection with the execution of the agreement, the Company paid a non-refundable option payment to the current owner of $1.0 million. The Company intends to pursue the entitlements necessary to develop the property. The purchase price has not been determined and is dependent on the entitlements obtained. There can be no assurance that the Company will be successful in obtaining the desired entitlements or that it will ultimately determine to exercise the option.

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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 the relatively weak economic recovery, relatively 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

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long-term space utilization and amenity needs in the local markets in which we operate, our relationships with local brokers, our reputation as a premier developer, 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.

Our portfolio is concentrated in markets and submarkets which include traditional tenants, such as government, financial services and law firms, as well as businesses that are oriented on new ideas, such as technology, advertising, media and information distribution (often referred to as “TAMI”), mobility, life sciences and medical devices. We continue to benefit from this as the TAMI segments of the economy are expanding and leasing additional office space. This is particularly true in the San Francisco Central Business District (“CBD”), Silicon Valley, Cambridge, Massachusetts and suburban Boston submarkets where we are seeing increasing levels of leasing activity. 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 to cater to more collaborative work environments and fit people more efficiently into less space. In addition, markets such as Washington, DC and, to a lesser extent, midtown Manhattan which are more reliant on traditional tenants are experiencing relatively lower levels of activity and growth. We are also seeing new construction in our markets accommodating both growing tenant sectors and traditional tenants seeking more efficient space utilization. This may result in an increase in supply and create challenges for us to increase our occupancy and the rents we can realize. We are proactively managing our near- and medium-term lease expirations. As our tenants adjust their space needs, we may extend the leases of quality tenants on a long-term basis, invest in tenant improvements to improve space utilization and take back portions of their space to re-lease to other tenants at current rates. In some cases, this may result in space down-time and foregone revenue in the short-term, but better position us for more stable long-term revenues. Despite these challenges, we remain optimistic about the long-term operating fundamentals in all of our markets.

Leasing activity in our portfolio remains strong. During the third quarter of 2014, we signed approximately 1.9 million square feet of leases covering vacant space, pre-leasing for our development projects and extensions and expansions, including approximately 650,000 square feet of early renewals with two law firms and an expanding existing tenant. This total exceeds our quarterly average for the past five years by approximately 46%, with the Boston and New York regions being the largest contributors. The overall percentage of leased space for the 158 properties in service (excluding the three in-service residential properties and the hotel) as of September 30, 2014 was 92.0% compared to 93.0% at June 30, 2014. The decrease of 1.0% is due to the placing in-service of 250 West 55th Street, our approximately 988,000 square foot office building in New York City, which was approximately 54% leased as of September 30, 2014 and is currently 77% leased, including leases with future commencement dates.

In the New York region, during the third quarter we completed approximately 592,000 square feet of leasing in twenty lease transactions, including a 388,000 square foot early renewal with a law firm at 767 Fifth Avenue (The General Motors Building) for fifteen additional years. In addition, we ceased interest capitalization on September 1, 2014 and fully placed in-service our 250 West 55th Street development project. We have limited rollover exposure through the end of 2015 of approximately 4.5%. We are actively engaged with several additional law firm tenants that currently lease approximately 937,000 square feet under leases that expire in 2017 and thereafter regarding possible renewals.

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 office occupancy rate of 95.7%. We are actively engaging our law firm tenants with future lease expirations, including two firms currently occupying approximately 540,000 square feet in our CBD portfolio, to provide new space configurations in exchange for extended lease terms at market rents. In addition, our suburban Washington, DC assets are 96.4% leased at September 30, 2014, with moderate rollover/exposure through the end of 2015 of approximately 11.5%. We anticipate our occupancy in the Washington, DC region will decline from 96.1%, at September 30, 2014, to an average of 93.3% in 2015.

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In the Boston region, the expansion of the life sciences and technology industry is positively impacting each of the submarkets in which we operate. Our assets in the Boston CBD are 93.2% leased, with approximately 308,000 square feet of the Boston CBD portfolio vacancy leased to a tenant that will commence its lease in 2015. Through the end of 2015, leases for approximately 715,000 square feet are scheduled to expire, including two large blocks totaling approximately 414,000 square feet in the John Hancock Tower. This space includes (1) 170,000 square feet at the base of the building where we anticipate creating a new second lobby and rebranding this portion of the building “120 St. James Street” and (2) 244,000 square feet in the tower. While we believe all of this space is highly marketable and current market rents are greater than the expiring rents, we expect much of this space will be vacant during 2015 as new tenants lease and build out their space. In conjunction with the construction of our 888 Boylston Street 425,000 square foot development project, we expect to complete a major renovation of the Prudential Center Food Court and create additional retail space during 2015 which, upon completion, will enhance our revenues and our tenants’ experience at the Prudential Center. The East Cambridge submarket is the strongest submarket in the region and our Cambridge portfolio is approximately 99.6% leased. 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 487,000 square feet of leases during the quarter, including an approximately 152,000 square foot lease for our anchor tenant at 10 CityPoint, a 245,000 square foot development project in Waltham, Massachusetts.

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. During the third quarter of 2014, we leased approximately 121,000 square feet, with a year-to-date total space leased of approximately 1.4 million square feet. We have approximately 426,000 square feet of space expiring in the San Francisco region through the end of 2015 at rents that are below current market rents. Construction of 535 Mission Street is on schedule and we expect to be able to deliver space to tenants and commence revenue recognition for the initial tenant in the fourth quarter of 2014.

The table below details the leasing activity during the three and nine months ended September 30, 2014:

	Three Months Ended September 30, 2014			Nine Months Ended September 30, 2014
	Square Feet
Vacant space available at the beginning of the period		2,843,617			2,683,647
Properties placed in-service		852,641			1,522,457
Leases expiring or terminated during the period		1,066,364			3,304,186
Total space available for lease		4,762,622			7,510,290
1st generation leases		357,789			1,081,968
2nd generation leases with new tenants		468,499			1,504,184
2nd generation lease renewals		563,439			1,551,243
Total space leased		1,389,727			4,137,395
Vacant space available for lease at the end of the period		3,372,895			3,372,895
Second generation leasing information:(1)
Leases commencing during the period, in square feet		1,031,938			3,055,427
Average Lease Term		85 Months			70 Months
Average Free Rent Period		79 Days			59 Days
Total Transaction Costs Per Square Foot(2)	$	46.17		$	31.31
Increase in Gross Rents(3)		13.74	%		6.55	%
Increase in Net Rents(4)		20.72	%		9.18	%

(1) Second generation leases are defined as leases for space that had previously been leased. Of the 1,031,938 and 3,055,427 square feet of second generation leases that commenced during the three and nine months ended September 30, 2014, respectively, leases for 885,892 and 2,226,175 square feet were signed in prior periods for the three and nine months ended September 30, 2014, respectively.

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(2) Total transaction costs include tenant improvements and leasing commissions and exclude free rent concessions and other inducements in accordance with GAAP.

(3) Represents the increase in gross rent (base rent plus expense reimbursements) on the new vs. expired leases on the 869,019 and 2,514,844 square feet of second generation leases (1) that had been occupied within the prior 12 months and (2) for which the new lease term is greater than six months for the three and nine months ended September 30, 2014, respectively.

(4) Represents the increase in net rent (gross rent less operating expenses) on the new vs. expired leases on the 869,019 and 2,514,844 square feet of second generation leases (1) that had been occupied within the prior 12 months and (2) for which the new lease term is greater than six months for the three and nine months ended September 30, 2014, respectively.

In the aggregate from October 1, 2014 to December 31, 2015, leases representing approximately 8.2% 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 2019. 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. As of September 30, 2014, our current development pipeline, which excludes properties which are fully placed in-service, totals approximately 3.3 million square feet with a total projected investment of approximately $2.1 billion, of which approximately $1.3 billion remains to be funded. Additionally, we are working on several new developments in each of our markets that could commence in 2015 or later.

Given investor demand for assets like ours we 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 2014, we expect to complete the sale of an aggregate of approximately $2.3 billion (our share) of assets generating $1.9 billion of sale proceeds. Included in this amount is the October 30, 2014 sale of a 45% interest in each of 601 Lexington Avenue in New York, and Atlantic Wharf Office Building and 100 Federal Street in Boston for an aggregate gross sale price of $1.827 billion in cash, less the partner’s pro rata share of indebtedness secured by 601 Lexington Avenue, subject to certain prorations and adjustments. In general, we structure asset sales for possible inclusion in like-kind exchanges within the meaning of Section 1031 of the Internal Revenue Code. The ability to complete a like-kind exchange depends on many factors, including, among others, identifying and acquiring suitable replacement property within limited time periods and the ownership structure of the 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, a like-kind exchange enables 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 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 (See “Liquidity and Capital Resources—REIT Tax Distribution Considerations—Application of Recent Regulations”).

We continue to maintain substantial liquidity, including available cash, as of November 3, 2014, of approximately $2.6 billion, which includes approximately $1.9 billion of restricted cash which is being held for possible investment in a like-kind exchange in accordance with Section 1031 of the Internal Revenue Code, and

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approximately $984 million available under our Operating Partnership’s $1.0 billion Unsecured Line of Credit. Our more significant future funding requirements include approximately $1.3 billion of our development pipeline that remains to be funded through 2019, approximately $165 million (of which our share is approximately $45 million) of secured debt that matures through 2015 and the optional redemption of $550 million aggregate principal amount of unsecured senior notes on December 15, 2014 (See Note 13 of the Consolidated Financial Statements). 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 September 30, 2014 included the following:

• On July 1, 2014, we used available cash to repay the mortgage loan collateralized by our New Dominion Technology Park Building Two property located in Herndon, Virginia totaling $63.0 million. The mortgage loan bore interest at a fixed rate of 5.55% per annum and was scheduled to mature on October 1, 2014. There was no prepayment penalty.

• On July 3, 2014, our Operating Partnership redeemed 319,687 Series Four Preferred Units for cash totaling approximately $16.0 million. Our Operating Partnership currently has 40,440 Series Four Preferred Units outstanding, 12,667 of which are subject to a security interest under a pledge agreement.

• On July 29, 2014, we completed the sale of our Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

• On August 20, 2014, a portion of the land parcel at our One Reston Overlook property located in Reston, Virginia was taken by eminent domain. Net cash proceeds totaled approximately $2.6 million, resulting in a gain on sale of real estate totaling approximately $1.2 million.

• On August 22, 2014, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

• On August 31, 2014, we completed and fully placed in-service 250 West 55th Street, a Class A office project with approximately 988,000 net rentable square feet located in New York City. The property is 77% leased.

• On September 17, 2014, we completed and fully placed in-service 680 Folsom Street, a Class A office project with approximately 525,000 net rentable square feet located in San Francisco, California. The property is 98% leased.

• On September 18, 2014, we received an initial distribution from our unsecured creditor claim against Lehman Brothers, Inc. totaling approximately $7.7 million. There can be no assurance as to the timing or amount of additional proceeds, if any, that we may ultimately realize on the claim.

Transactions completed subsequent to September 30, 2014 included the following:

• On October 2, 2014, we completed the sale of our Patriots Park properties located in Reston, Virginia for a gross sale price of $321.0 million, which exceeded the carrying value of the properties. Patriots Park consists of three Class A office properties aggregating approximately 706,000 net rentable square feet.

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• On October 16, 2014, our Operating Partnership released to the holders 27,773 Series Four Preferred Units that were previously subject to a security interest under a pledge agreement (See Note 8 of the Consolidated Financial Statements). On November 5, 2014, our Operating Partnership redeemed such units for cash totaling approximately $1.4 million. An aggregate of 12,667 Series Four Preferred Units remain outstanding and subject to the security interest under the pledge agreement.

• On October 22, 2014, MIT exercised its right to purchase our 415 Main Street property (formerly Seven Cambridge Center) located in Cambridge, Massachusetts on February 1, 2016 for approximately $106 million. As part of its lease signed on July 14, 2004, MIT was granted a fixed price option to purchase the building at the beginning of the 11th lease year. 415 Main Street is an Office/Technical property with approximately 231,000 net rentable square feet occupied by the Broad Institute. The sale is subject to the satisfaction of customary closing conditions and there can be no assurance that the sale will be consummated on the terms currently contemplated or at all.

• On October 24, 2014, we completed the sale of a parcel of land at 130 Third Avenue in Waltham, Massachusetts that is permitted for 129,000 square feet for a sale price of approximately $14.3 million, which exceeded the carrying value of the property.

• On October 24, 2014, a joint venture in which we have a 50% interest extended the loan collateralized by its Annapolis Junction Building Six property. At the time of the extension, the outstanding balance of the construction loan totaled approximately $13.9 million and bore interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on November 17, 2014. The extended loan has a total commitment amount of $16.4 million, bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on November 17, 2015. Annapolis Junction Building Six is a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

• On October 30, 2014, we completed the sale of a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston for an aggregate gross sales price of approximately $1.827 billion in cash, less the partner’s pro rata share of the indebtedness secured by 601 Lexington Avenue, subject to certain prorations and adjustments. In connection with the sale, we formed a joint venture for each property with the buyer and will provide customary property management and leasing services to the joint ventures. 601 Lexington Avenue is a 1,669,000 square foot Class A office complex located in Midtown Manhattan. The property consists of a 59-story tower as well as a six-story low-rise office and retail building. The property is subject to existing mortgage indebtedness of approximately $712.9 million. The Atlantic Wharf Office Building is a 791,000 square foot Class A office tower located on Boston’s Waterfront. 100 Federal Street is a 1,323,000 square foot Class A office tower located in Boston’s Financial District. We currently expect that we will distribute at least the amount of proceeds necessary to avoid paying a corporate level tax on the gain realized from the sale. The transaction did not qualify as a sale of real estate for financial reporting purposes as we continue to control the joint ventures and will therefore continue to account for the properties on a consolidated basis in our financial statements.

• On November 1, 2014, we partially placed in-service 535 Mission Street, a Class A office project with approximately 307,000 net rentable square feet located in San Francisco, California. The property is 36% leased.

• On November 3, 2014, our Operating Partnership issued notices to redeem on December 15, 2014 (i) $300.0 million in aggregate principal amount of its 5.625% senior notes due 2015, which were scheduled to mature on April 15, 2015 (the “5.625% Notes”), and (ii) $250.0 million in aggregate principal amount of its 5.000% senior notes due 2015, which were scheduled to mature on June 1, 2015 (the “5.000% Notes”). The redemption price for each series of notes will equal the sum of (a) the present values as of the redemption date of the remaining scheduled payments of principal and interest from the redemption date to maturity (excluding any accrued and unpaid interest) discounted on a semi-annual basis at a rate equal to the yield to maturity of a comparable United States Treasury security plus (i) in the case of the 5.625% Notes, 0.35%, or (ii) in the case of the 5.00% Notes, 0.25%,

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plus (b) accrued interest to, but excluding, December 15, 2014, as provided in the applicable indenture. The redemption price for each series of notes will be calculated three business days prior to the redemption date and will be payable on December 15, 2014 in accordance with the terms of the applicable indentures.

• On November 6, 2014, we entered into an option agreement pursuant to which we have been granted an option to purchase real property located at 425 Fourth Street in San Francisco, California. In connection with the execution of the agreement, we paid a non-refundable option payment to the current owner of $1.0 million. We intend to pursue the entitlements necessary to develop the property. The purchase price has not been determined and is dependent on the entitlements obtained. There can be no assurance that we will be successful in obtaining the desired entitlements or that we will ultimately determine to exercise the option.

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,

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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 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

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construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. We cease capitalization on the portion (1) substantially completed, (2) occupied or held available for occupancy, and we capitalize only those costs associated with the portion under construction or (3) if activities necessary for the development of the property have been suspended.

Investments in Unconsolidated Joint Ventures

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

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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.

Revenue Recognition

In general, we commence rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. 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 original term 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 and nine months ended September 30, 2014, the impact of the net adjustments of rents from “above-” and “below-market” leases increased rental revenue by approximately $11.5 million and $30.7 million, respectively. For the three and nine months ended September 30, 2014, the impact of the straight-line rent adjustment increased rental revenue by approximately $19.9 million and $41.8 million, respectively. 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.

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

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

• payment history;

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

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

• tenant financial performance;

• economic conditions in a specific geographic region; and

• industry specific credit considerations.

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 6.8 years as of September 30, 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.

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Depreciation and Amortization

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

Fair Value of Financial Instruments

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

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

Recent Accounting Pronouncements

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contract with Customers (Topic 606)” (“ASU 2014-09”). The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying ASU 2014-09, companies will perform a five-step analysis of transactions to determine when and how revenue is recognized. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB’s Accounting Standards Codification (“ASC”). ASU 2014-09 is effective for annual reporting

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periods (including interim periods within that reporting period) beginning after December 15, 2016 and shall be applied using either a full retrospective or modified retrospective approach. Early adoption is not permitted. We are currently assessing the potential impact that the adoption of ASU 2014-09 will have on our consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period” (“ASU 2014-12”). The amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in ASC Topic No. 718, “Compensation—Stock Compensation” (“ASC 718”), as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in ASU 2014-12 either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. We do not expect the adoption of ASU 2014-12 to have a material impact on our consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern” (“ASU 2014-15”). ASU 2014-15 requires an entity to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or within one year after the financial statements are available to be issued when applicable) and to provide related footnote disclosures in certain circumstances. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter with early adoption permitted. We do not expect the adoption of ASU 2014-15 to have a material impact on our consolidated financial statements.

Results of Operations

The following discussion is based on our Consolidated Statements of Operations for the three and nine months ended September 30, 2014 and 2013.

At September 30, 2014 and September 30, 2013, we owned or had interests in a portfolio of 172 and 177 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 and nine months ended September 30, 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, Development or Redevelopment or Sold Portfolios.

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

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

Our management also uses NOI to evaluate regional property level performance and to make decisions about resource allocations. Further, we believe NOI is useful to investors as a performance measure because, when compared across periods, NOI reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspectives not immediately apparent from net income attributable to Boston Properties, Inc. NOI excludes certain components from net income attributable to Boston Properties, Inc. in order to provide results that are more closely related to a property’s results of operations. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. In addition, depreciation and amortization, because of historical cost accounting and useful life estimates, may distort operating performance at the property level. NOI presented by us may not be comparable to NOI reported by other REITs that define NOI differently. We believe that in order to facilitate a clear understanding of our operating results, NOI should be examined in conjunction with net income attributable to Boston Properties, Inc. as presented in our Consolidated Financial Statements. NOI should not be considered as an alternative to net income attributable to Boston Properties, Inc. as an indication of our performance or to cash flows as a measure of liquidity or ability to make distributions. For a reconciliation of NOI to net income attributable to Boston Properties, Inc., see Note 12 to the Consolidated Financial Statements.

Comparison of the nine months ended September 30, 2014 to the nine months ended September 30, 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 September 30, 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 September 30, 2014. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the nine months ended September 30, 2014 and 2013 with respect to the properties that were placed in-service, acquired or consolidated, in development or redevelopment or sold.

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	Same Property Portfolio										Properties Acquired  or Consolidated Portfolio				Properties Placed In-Service Portfolio				Properties  in Development or Redevelopment Portfolio					Properties Sold Portfolio				Total Property Portfolio
(dollars in thousands)	2014		2013		Increase/ (Decrease)			% Change			2014		2013		2014		2013		2014		2013			2014		2013		2014			2013			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	1,415,890	$	1,364,259	$	51,631			3.78	%	$	238,214	$	102,792	$	44,232	$	14,949	$	—	$	2,248		$	5,022	$	4,266	$	1,703,358		$	1,488,514		$	214,844			14.43	%
Termination Income		10,260		2,144		8,116			378.54	%		—		—		—		—		—		—			—		—		10,260			2,144			8,116			378.54	%
Total Rental Revenue		1,426,150		1,366,403		59,747			4.37	%		238,214		102,792		44,232		14,949		—		2,248			5,022		4,266		1,713,618			1,490,658			222,960			14.96	%
Real Estate Operating Expenses		521,802		498,311		23,491			4.71	%		75,030		32,595		14,589		3,768		—		421			931		800		612,352			535,895			76,457			14.27	%
Net Operating Income, excluding residential and hotel		904,348		868,092		36,256			4.18	%		163,184		70,197		29,643		11,181		—		1,827			4,091		3,466		1,101,266			954,763			146,503			15.34	%
Residential Net Operating Income(1)		7,041		8,085		(1,044	)		(12.91	)%		—		—		96		—		—		—			—		—		7,137			8,085			(948	)		(11.73	)%
Hotel Net Operating Income(1)		10,781		9,102		1,679			18.45	%		—		—		—		—		—		—			—		—		10,781			9,102			1,679			18.45	%
Consolidated Net Operating Income(1)		922,170		885,279		36,891			4.17	%		163,184		70,197		29,739		11,181		—		1,827			4,091		3,466		1,119,184			971,950			147,234			15.15	%
Other Revenue:
Development and management services		—		—		—			—			—		—		—		—		—		—			—		—		18,197			22,063			(3,866	)		(17.52	)%
Other Expenses:
General and administrative expense		—		—		—			—			—		—		—		—		—		—			—		—		75,765			94,673			(18,908	)		(19.97	)%
Transaction costs		—		—		—			—			—		—		—		—		—		—			—		—		2,500			1,744			756			43.35	%
Impairment loss		—		—		—			—			—		—		—		—		—		—			—		—		—			8,306			(8,306	)		(100.00	)%
Depreciation and amortization		351,588		348,028		3,560			1.02	%		96,685		47,319		15,067		3,818		—		4,579			2,803		2,418		466,143			406,162			59,981			14.77	%
Total Other Expenses		351,588		348,028		3,560			1.02	%		96,685		47,319		15,067		3,818		—		4,579			2,803		2,418		544,408			510,885			33,523			6.56	%
Operating Income		570,582		537,251		33,331			6.20	%		66,499		22,878		14,672		7,363		—		(2,752	)		1,288		1,048		592,973			483,128			109,845			22.74	%
Other Income:
Income from unconsolidated joint ventures																													10,069			72,240			(62,171	)		(86.06	)%
Gains on consolidation of joint ventures																													—			385,991			(385,991	)		(100.00	)%
Interest and other income																													6,841			6,646			195			2.93	%
Gains from investments in securities																													651			1,872			(1,221	)		(65.22	)%
Gains from early extinguishments of debt																													—			122			(122	)		(100.00	)%
Other Expenses:
Interest expense																													337,839			325,746			12,093			3.71	%
Income From Continuing Operations																													272,695			624,253			(351,558	)		(56.32	)%
Discontinued Operations:
Income from discontinued operations																													—			7,486			(7,486	)		(100.00	)%
Gain on sale of real estate from discontinued operations																													—			86,448			(86,448	)		(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	%
Income Before Gains On Sales Of Real Estate																													272,695			735,128			(462,433	)		(62.91	)%
Gains on sales of real estate																													41,937			—			41,937			100.00	%
Net Income																													314,632			735,128			(420,496	)		(57.20	)%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships																													(17,473	)		924			(18,397	)		(1,991.02	)%
Noncontrolling interest—redeemable preferred units of the Operating Partnership																													(1,014	)		(3,385	)		2,371			70.04	%
Noncontrolling interest—common units of the Operating Partnership																													(29,819	)		(62,945	)		33,126			52.63	%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																													—			(11,450	)		11,450			100.00	%
Net Income Attributable to Boston Properties, Inc.																												$	266,326		$	658,272		$	(391,946	)		(59.54	)%
Preferred dividends																													(7,854	)		(5,411	)		(2,443	)		(45.15	)%
Net Income Attributable to Boston Properties, Inc. Common shareholders																												$	258,472		$	652,861		$	(394,389	)		(60.41	)%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 44. Residential Net Operating Income for the nine months ended September 30, 2014 and 2013 are comprised of Residential Revenue of $18,998 and $16,555 less Residential Expenses of $11,861 and $8,470, respectively. Hotel Net Operating Income for the nine months ended September 30, 2014 and 2013 are comprised of Hotel Revenue of $32,478 and $30,061 less Hotel Expenses of $21,697 and $20,959, 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 $51.6 million for the nine months ended September 30, 2014 compared to 2013. The increase was primarily the result of increases in revenue from our leases, parking income and other income and recoveries of approximately $48.0 million, $3.5 million and $0.1 million, respectively. Rental revenue from our leases increased approximately $48.0 million as a result of our average revenue per square foot increasing by approximately $1.44, contributing approximately $35.2 million, and an approximately $12.8 million increase due to an increase in average occupancy from 92.0% to 92.8%.

For fiscal 2014, we expect an increase in Same Property Portfolio net operating income of approximately 3.0% to 3.25% compared to 2013 and for fiscal 2015, we expect our occupancy to decline to approximately 91%-92% due primarily to several lease expirations in our Boston region, resulting in 2015 Same Property Portfolio net operating income to be relatively flat at approximately (1.0)% to 0.50% compared to 2014.

Termination Income

Termination income increased by approximately $8.1 million for the nine months ended September 30, 2014 compared to 2013.

Termination income for the nine months ended September 30, 2014 related to twenty-one tenants across the Same Property Portfolio and totaled approximately $10.3 million of which approximately $7.7 million related to an initial distribution we received from our unsecured creditor claim against Lehman Brothers, Inc. (See Note 7 of the Consolidated Financial Statements).

Termination income for the nine months ended September 30, 2013 related to nineteen tenants across the Same Property Portfolio and totaled approximately $2.1 million of which approximately $1.0 million was negotiated termination income from one of our Reston, Virginia properties in order to accommodate growth of another existing tenant.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $23.5 million for the nine months ended September 30, 2014 compared to 2013 due primarily to (1) an increase of approximately $11.2 million, or 5.1%, in real estate taxes, which we primarily experienced in our Washington, DC and New York regions, (2) an increase of approximately $7.2 million, or 9.3%, in repairs and maintenance expense, which we primarily experienced in the Boston and New York CBD buildings and the Washington, DC region, (3) an increase of approximately $2.6 million, or 9.6%, in roads and grounds expense, which we primarily experienced in the Boston and Washington, DC regions and (4) an increase of approximately $2.5 million, or 1.5%, in other operating expenses.

Depreciation and Amortization Expense

Depreciation and amortization expense for the Same Property Portfolio increased approximately $3.6 million, or 1.0%, for the nine months ended September 30, 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. 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

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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 July 29, 2014, we sold Mountain View Technology Park and Mountain View Research Park Building Sixteen, which in aggregate is approximately 198,000 square feet. See Note 3 to the Consolidated Financial Statements and “Results of Operations—Properties Sold Portfolio” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue (the General Motors Building) 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 $135.4 million for the nine months ended September 30, 2014 compared to 2013, as detailed below:

Property	Date Acquired or Consolidated	Rental Revenue for the nine months ended September  30,
		2014		2013		Change
		(in thousands)
Mountain View Research Park	April 10, 2013	$	13,894	$	7,712	$	6,182
767 Fifth Avenue (the General Motors Building)	May 31, 2013		224,320		95,080		129,240
Total		$	238,214	$	102,792	$	135,422

Real Estate Operating Expenses

Real estate operating expenses from our Properties Acquired or Consolidated Portfolio increased approximately $42.4 million for the nine months ended September 30, 2014 compared to 2013, as detailed below:

Property	Date Acquired or Consolidated	Real Estate Operating Expenses for the nine months ended September 30,
		2014		2013		Change
		(in thousands)
Mountain View Research Park	April 10, 2013	$	3,073	$	1,792	$	1,281
767 Fifth Avenue (the General Motors Building)	May 31, 2013		71,957		30,803		41,154
Total		$	75,030	$	32,595	$	42,435

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Acquired or Consolidated Portfolio increased by approximately $49.4 million for the nine months ended September 30, 2014 compared to 2013 due to the additional depreciation expense incurred for the nine months ended September 30, 2014 associated with Mountain View Research Park that was acquired on April 10, 2013 and 767 Fifth Avenue (the General Motors Building) that was consolidated on May 31, 2013, and, as a result, were not recognizing depreciation expense for the full nine months ended September 30, 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 September 30, 2014. The square footage amount for the seven properties that are fully placed in-service is approximately 2.6 million square feet. One and Two Patriots Park comprise of a two-phase redevelopment project for a single tenant. On October 2, 2014, we completed the sale of our Patriots Park properties located in Reston, Virginia (See Note 13 of the Consolidated Financial Statements).

Rental Revenue

Rental revenue from our Properties Placed In-Service Portfolio increased approximately $31.9 million for the nine months ended September 30, 2014 compared to 2013, as detailed below:

Property	Quarter Initially Placed  In- Service	Quarter Fully Placed  In- Service	Rental Revenue for the nine months ended September  30,
			2014		2013		Change
			(in thousands)
Office
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)	$	13,277	$	11,632	$	1,645
300 Binney Street (formerly Seventeen Cambridge Center)	Second Quarter, 2013	Second Quarter, 2013		8,136		3,241		4,895
250 West 55th Street	Third Quarter, 2013	Third Quarter, 2014		14,052		76		13,976
680 Folsom Street	Fourth Quarter, 2013	Third Quarter, 2014		8,767		—		8,767
			$	44,232	$	14,949	$	29,283
Residential
The Avant at Reston Town Center	Fourth Quarter, 2013	First Quarter, 2014	$	2,612	$	—	$	2,612
Total			$	46,844	$	14,949	$	31,895

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Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $13.3 million for the nine months ended September 30, 2014 compared to 2013, as detailed below:

Property	Quarter Initially Placed  In- Service	Quarter Fully Placed In- Service	Real Estate  Operating Expenses for the nine months ended September 30,
			2014		2013		Change
			(in thousands)
Office
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)	$	4,349	$	3,144	$	1,205
300 Binney Street (formerly Seventeen Cambridge Center)	Second Quarter, 2013	Second Quarter, 2013		744		360		384
250 West 55th Street	Third Quarter, 2013	Third Quarter, 2014		6,965		264		6,701
680 Folsom Street	Fourth Quarter, 2013	Third Quarter, 2014		2,531		—		2,531
			$	14,589	$	3,768	$	10,821
Residential
The Avant at Reston Town Center	Fourth Quarter, 2013	First Quarter, 2014	$	2,516	$	—	$	2,516
Total			$	17,105	$	3,768	$	13,337

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio increased by approximately $11.2 million for the nine months ended September 30, 2014 compared to 2013 due to the additional depreciation expense incurred for the nine months ended September 30, 2014 associated with One and Two Patriots Park, 300 Binney Street (formerly Seventeen Cambridge Center), 250 West 55th Street, 680 Folsom Street and The Avant at Reston Town Center that were all fully or partially placed in-service during or subsequent to the nine months ended September 30, 2013, and, as a result, we were not recognizing depreciation expense for the full nine months ended September 30, 2013.

Properties in Development or Redevelopment Portfolio

During the nine months ended September 30, 2013, the Properties in Development or Redevelopment Portfolio consisted of our 601 Massachusetts Avenue property located in Washington, DC. We commenced development of this property on April 25, 2013 and it is expected to be completed during the fourth quarter of 2015. Prior to the commencement of development, this building was operational and during the nine months ended September 30, 2013, had approximately $2.2 million of revenue and approximately $0.4 million of operating expenses. In addition, during the nine months ended September 30, 2013, the building had approximately $4.6 million of depreciation and amortization expense.

Properties Sold Portfolio

On July 29, 2014, we completed the sale of our Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

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On August 22, 2014, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

Rental Revenue

Rental revenue from our Properties Sold Portfolio increased approximately $756,000 for the nine months ended September 30, 2014 compared to 2013, as detailed below:

Property	Date Sold	Rental Revenue for the nine months ended September 30,
		2014		2013		Change
		(in thousands)
Mountain View Technology Park	July 29, 2014	$	2,603	$	2,060	$	543
Mountain View Research Park Building Sixteen	July 29, 2014		1,510		1,109		401
Broad Run Business Park land parcel	August 22, 2014		909		1,097		(188	)
Total		$	5,022	$	4,266	$	756

Real Estate Operating Expenses

Real estate operating expenses from our Properties Sold Portfolio increased approximately $131,000 for the nine months ended September 30, 2014 compared to 2013, as detailed below:

Property	Date Sold	Real Estate Operating Expenses for the nine months ended September 30,
		2014		2013		Change
		(in thousands)
Mountain View Technology Park	July 29, 2014	$	456	$	360	$	96
Mountain View Research Park Building Sixteen	July 29, 2014		235		166		69
Broad Run Business Park land parcel	August 22, 2014		240		274		(34	)
Total		$	931	$	800	$	131

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Sold Portfolio increased by approximately $385,000 for the nine months ended September 30, 2014 compared to 2013. On April 10, 2013, we acquired the Mountain View Research Park, which included Mountain View Research Park Building Sixteen and Mountain View Technology Park properties from the Value-Added Fund and therefore we did not have depreciation and amortization expense for the entire nine month period ended September 30, 2013. Subsequently, we sold Mountain View Technology Park and Mountain View Research Park Building Sixteen on July 29, 2014 and therefore did not have depreciation and amortization expense for the entire nine month period ended September 30, 2014. As a result, the increase is primarily due to the fact that we owned those properties for a longer period in 2014 compared to 2013.

Other Operating Income and Expense Items

Residential Net Operating Income

Net operating income for our residential properties decreased by approximately $0.9 million for the nine months ended September 30, 2014 compared to 2013.

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The following reflects our occupancy and rate information for The Lofts at Atlantic Wharf, the Residences on The Avenue and The Avant at Reston Town Center for the nine months ended September 30, 2014 and 2013.

	The Lofts at Atlantic Wharf									Residences on The Avenue									The Avant at Reston Town Center(1)
	2014			2013			Percentage Change			2014			2013			Percentage Change			2014			2013		Percentage Change
Average Physical Occupancy(2)		96.4	%		98.7	%		(2.3	)%		91.8	%		92.8	%		(1.1	)%		29.2	%		N/A		N/A
Average Economic Occupancy(3)		96.4	%		97.0	%		(0.6	)%		91.1	%		92.4	%		(1.4	)%		25.0	%		N/A		N/A
Average Monthly Rental Rate(4)	$	3,914		$	3,743			4.6	%	$	3,174		$	3,317			(4.3	)%	$	2,202			N/A		N/A
Average Rental Rate Per Occupied Square Foot	$	4.37		$	4.17			4.8	%	$	3.89		$	4.06			(4.2	)%	$	2.40			N/A		N/A

(1) This property was initially placed in-service during the fourth quarter of 2013 and fully placed in-service during the first quarter of 2014. For the operating results refer to “Results of Operations—Properties Placed in-Service Portfolio” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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

(3) 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.

(4) 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 Boston Marriott Cambridge (formerly Cambridge Center Marriott) hotel property increased by approximately $1.7 million for the nine months ended September 30, 2014 compared to 2013. We expect our hotel net operating income for fiscal 2014 to be between $13 million and $14 million and between $12 million and $14 million for fiscal 2015.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge (formerly Cambridge Center Marriott) hotel for the nine months ended September 30, 2014 and 2013.

	2014			2013			Percentage Change
Occupancy		84.1	%		81.3	%		3.4	%
Average daily rate	$	249.98		$	229.40			9.0	%
Revenue per available room, REVPAR	$	210.27		$	207.60			1.3	%

Development and Management Services

Development and management services income decreased approximately $3.9 million for the nine months ended September 30, 2014 compared to 2013. The decrease was due to decreases in development fee and management fee income of approximately $0.5 million and $3.4 million, respectively. The decrease in development fees is primarily due to a decrease in fees associated with tenant improvement project management partially offset by an increase in the development fees earned from our current and pending development projects in the Boston and Washington, DC regions. The decrease in management fees is due primarily to a decrease in management and leasing 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. We expect fee income for fiscal 2014 to be between $22 million and $25 million. In addition, we

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expect fee income for fiscal 2015 to be between $15 million and $20 million. Our 2015 estimates are less than 2014 due to the completion of several large, third-party development fee projects in 2014, including the Broad Institute expansion in Cambridge, Massachusetts and the George Washington University Science Center in Washington, DC and we have been focusing our resources on our development pipeline and delivering our new projects as opposed to third-party assignments.

General and Administrative

General and administrative expenses decreased approximately $18.9 million for the nine months ended September 30, 2014 compared to 2013 due primarily to the timing of the recognition of expenses under 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 continues 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. Because Mr. Zuckerman remained employed by us through July 1, 2014, he is 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 vested in three equal installments on each of March 10, 2013, October 1, 2013 and July 1, 2014. As a result, we recognized approximately $11.8 million of compensation expense during the nine months ended September 30, 2013 and approximately $4.0 million of compensation expense during the nine months ended September 30, 2014 related to the Transition Benefits Agreement. Under the Transition Benefits Agreement, during the nine months ended September 30, 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, for the nine months ended September 30, 2014 compared to 2013 we had an approximately $2.3 million increase in our capitalized wages due to the signing of several large leases. The increase in capitalized wages is shown as a decrease in general and administrative expenses as these costs are capitalized and included in real estate assets or deferred charges on our Consolidated Balance Sheets (see below). We also had an approximately $1.2 million decrease in the value of our deferred compensation plan. These decreases were partially offset by the following increases: (1) approximately $2.6 million related to the net effect of the termination of the 2011 OPP Awards and the issuance of the 2014 MYLTIP Units (See Note 11 to the Consolidated Financial Statements), (2) approximately $0.3 million related to the write off of the remaining fees associated with our ATM program that expired on June 2, 2014 and (3) approximately $2.4 million related to other general and administrative expenses, which includes compensation expense. We expect our fiscal 2014 general and administrative expenses to be between $100 million and $102 million and between $100 million and $104 million in fiscal 2015.

Wages directly related to the development and leasing of rental properties are not included in our operating results. These costs are capitalized and included in real estate assets or deferred charges on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Capitalized wages for the nine months ended September 30, 2014 and 2013 were approximately $11.0 million and $8.7 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

During the nine months ended September 30, 2014, we incurred approximately $2.5 million of transaction costs, which related to (1) approximately $0.5 million for the pending sale of Patriots Park in Reston, Virginia (See Note 13 to the Consolidated Financial Statements), (2) approximately $0.5 million related to transactions that we are no longer pursuing in the Washington, DC region, (3) approximately $0.3 million for the formation of the joint venture agreement to sell to a third-party a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston, Massachusetts (See Note 13 to the Consolidated Financial Statements) and (4) approximately $1.2 million related to the pursuit or sale of other assets and the formation of joint venture agreements.

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During the nine months ended September 30, 2013, we incurred approximately $1.7 million of transaction costs related to (1) approximately $0.6 million related to the acquisition of the Mountain View Research Park and Mountain View Technology Park properties in Mountain View, California, (2) approximately $0.4 million related to Salesforce Tower (formerly Transbay Tower) in San Francisco, California, (3) approximately $0.5 million related to transaction costs for transactions in New York City and (4) approximately $0.2 million related to the pursuit of other transactions.

Impairment Loss

On March 28, 2013, we executed a binding contract for the sale of our 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. The pending sale of this asset caused us to evaluate our strategy for development of the adjacent Almaden land parcel which can accommodate approximately 840,000 square feet of office development. Based on a shorter than expected hold period, we reduced the carrying value of the land parcel to its 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 nine months ended September 30, 2014.

Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the nine months ended September 30, 2014 compared to 2013, income from unconsolidated joint ventures decreased by approximately $62.2 million due primarily to an approximately $46.5 million decrease in our share of net income from 125 West 55th Street due to its sale on May 30, 2013, an approximately $11.2 million decrease in our share of net income from the sale of the Eighth Avenue and 46th Street project in New York City on July 19, 2013 and an approximately $7.7 million decrease in our share of net income from 767 Fifth Avenue (the General Motors Building) related to its consolidation on June 1, 2013. These decreases were partially offset by an approximately $3.2 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.

On May 30, 2013, a joint venture in which we have a 60% interest completed the sale of its 125 West 55th Street property located in New York City for a sale price of $470.0 million, including the assumption by the buyer of the mortgage loan collateralized by the property totaling approximately $198.6 million. The mortgage loan bore interest at a fixed rate of 6.09% per annum and was scheduled to mature on March 10, 2020. Net cash proceeds totaled approximately $253.7 million, of which our share was approximately $152.2 million, after the payment of transaction costs. 125 West 55th Street is a Class A office property totaling approximately 588,000 net rentable square feet. We had previously recognized an impairment loss on our investment in the unconsolidated joint venture. As a result, we recognized a gain on sale of real estate totaling approximately $43.2 million. Prior to the sale, the property contributed approximately $3.3 million of net income for the nine months ended September 30, 2013.

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

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.”

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Gains on Consolidation of Joint Ventures

On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from our Value-Added Fund for an aggregate purchase price of approximately $233.5 million. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and account for them on a consolidated basis. During the nine months ended September 30, 2013, we recognized a gain on consolidation totaling approximately $26.5 million.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial statements instead of under the equity method of accounting. Our ownership interest in 767 Venture, LLC remained unchanged at 60%. During the nine months ended September 30, 2013, we recognized a non-cash gain on our investment of approximately $359.5 million. The gain on consolidation resulted from us recognizing the assets, liabilities and equity (including noncontrolling interests) of the joint venture at fair value on the date of consolidation resulting in the recognition of a gain on consolidation equal to the difference between the fair value of our equity interest totaling approximately $721.3 million (as reflected in the business combination table appearing on pages 132 and 133 of the Company’s Form 10-K for the fiscal year ended December 31, 2013) and the carrying value of our previously held equity interest totaling approximately $361.8 million. The fair value was determined based on the purchase price paid by the new joint venture partners through a sales process managed by a major New York City sales brokerage firm.

Interest and Other Income

Interest and other income increased approximately $0.2 million for the nine months ended September 30, 2014 compared to 2013 primarily due to a tax refund we received from the District of Columbia partially offset by a decrease in interest income due to lower average cash balances and interest rates.

Gains from Investments in Securities

Gains from investments in securities for the nine months ended September 30, 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 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 nine months ended September 30, 2014 and 2013, we recognized gains of approximately $0.7 million and $1.9 million, respectively, on these investments. By comparison, our general and administrative expense increased by approximately $0.7 million and $1.9 million during the nine months ended September 30, 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.

Gains from Early Extinguishments of Debt

On April 1, 2013, we used available cash to repay the mortgage loan collateralized by our 140 Kendrick Street property located in Needham, Massachusetts totaling approximately $47.6 million. The mortgage loan

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bore interest at a fixed rate of 7.51% per annum and was scheduled to mature on July 1, 2013. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment, which was the result of purchase accounting.

On April 15, 2013, we announced that holders of our Operating Partnership’s 3.75% Exchangeable Senior Notes due 2036 (the “Notes”) had the right to surrender their Notes for purchase by our Operating Partnership (the “Put Right”) on May 18, 2013. On April 15, 2013, we also announced that our Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on May 18, 2013 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the notice of redemption, holders of the Notes had the right to exchange their Notes on or prior to May 16, 2013. Notes with respect to which the Put Right was not exercised and that were not surrendered for exchange on or prior to May 16, 2013, were redeemed by our Operating Partnership at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon to, but excluding, the Redemption Date. Based on final information provided to our Operating Partnership by the trustee for the Notes, no Notes were validly tendered and accepted for purchase in the Put Right. Pursuant to the notice of redemption, an aggregate principal amount of $990,000 of the Notes was redeemed on May 18, 2013. The remaining aggregate principal amount of $449,010,000 of the Notes was surrendered for exchange and, in addition to the repayment of the principal in cash, we issued an aggregate of 419,116 shares of our common stock in exchange for the Notes. We recognized a loss on early extinguishment of debt totaling approximately $0.1 million consisting of transaction costs.

Interest Expense

Interest expense increased approximately $12.1 million for the nine months ended September 30, 2014 compared to 2013 as detailed below:

Component	Change in  interest expense for the nine months ended September 30, 2014 compared to September 30, 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)	$	21,265
Issuance of $700 million in aggregate principal of our Operating Partnership’s 3.800% senior notes due 2024 on June 27, 2013		13,134
Partner’s share of the interest for the outstanding Outside Members’ Notes Payable for 767 Fifth Avenue (the General Motors Building)		11,869
Reduction in capitalized interest		5,445
Issuance of $500 million in aggregate principal of our Operating Partnership’s 3.125% senior notes due 2023 on April 11, 2013		4,370
Total increases to interest expense	$	56,083
Decreases to interest expense due to:
Repayment of $747.5 million in aggregate principal of our Operating Partnership’s 3.625% exchangeable senior notes due 2014	$	(18,078	)
Interest expense associated with the adjustment for the equity component allocation of our Operating Partnership’s unsecured exchangeable debt		(15,643	)
Repurchases/redemption/exchange of $450.0 million in aggregate principal of our Operating Partnership’s 3.75% exchangeable senior notes due 2036		(6,281	)
Repayment of mortgage financings(1)		(1,673	)
Amortization of finance fees		(1,346	)
Other interest expense (excluding senior notes)		(969	)
Total decreases to interest expense	$	(43,990	)
Total change in interest expense	$	12,093

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(1) Includes the repayment of Kingstowne One, 140 Kendrick Street and New Dominion Technology Park Building Two.

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. As properties are placed in-service, we cease capitalizing interest and interest is then expensed. Interest capitalized for the nine months ended September 30, 2014 and 2013 was approximately $44.8 million and $50.3 million, respectively. These costs are not included in the interest expense referenced above.

We anticipate net interest expense for 2014 will be approximately $456 million to $459 million. This estimate assumes approximately $53 million to $55 million of capitalized interest and approximately $10 million of incremental interest expense related to the optional redemption in December 2014 of $550 million aggregate principal amount of our Operating Partnership’s unsecured senior notes that were scheduled to mature in 2015. We anticipate net interest expense for 2015 will be approximately $415 million to $425 million. This estimate assumes approximately $40 million to $50 million of capitalized interest. 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 September 30, 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 September 30, 2014 and September 30, 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 nine months ended September 30, 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 properties 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.

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

On June 28, 2013, we completed the sale of our 303 Almaden Boulevard property located in San Jose, California for a sale price of $40.0 million. 303 Almaden Boulevard is a Class A office property totaling approximately 158,000 net rentable square feet. Because we entered into the related purchase and sale agreement on March 28, 2013 and the carrying value of the property exceeded its net sale price, we recognized an impairment loss totaling approximately $3.2 million during the three months ended March 31, 2013. As a result, there was no loss on sale of real estate recognized. 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.

Gains on Sales of Real Estate

On July 29, 2014, we completed the sale of our Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

On August 20, 2014, a portion of the land parcel at our One Reston Overlook property located in Reston, Virginia was taken by eminent domain. Net cash proceeds totaled approximately $2.6 million, resulting in a gain on sale of real estate totaling approximately $1.2 million.

On August 22, 2014, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

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Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships increased by approximately $18.4 million for the nine months ended September 30, 2014 compared to 2013 as detailed below.

Property	Date of Consolidation	Partners’ noncontrolling interest for the nine months ended September 30,
		2014			2013			Change
		(in thousands)
505 9th Street	October 1, 2007	$	1,739		$	1,853		$	(114	)
Fountain Square	October 4, 2012		8,796			5,026			3,770
767 Fifth Avenue (the General Motors Building)	May 31, 2013		(12,957	)		(7,803	)		(5,154	)
Times Square Tower	October 9, 2013		19,895			—			19,895
		$	17,473		$	(924	)	$	18,397

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. In addition, during the nine months ended September 30, 2014 we made an out-of-period adjustment for our Fountain Square property of approximately $1.9 million related to the cumulative non-cash adjustment to the accretion of the changes in the redemption value of the noncontrolling interest (See Note 2 to the Consolidated Financial Statements).

Noncontrolling interest—Common Units of the Operating Partnership

Noncontrolling interest-common units of the Operating Partnership decreased by approximately $33.1 million for the nine months ended September 30, 2014 compared to 2013 due to a decrease in allocable income partially offset by an increase in the noncontrolling interest’s ownership percentage.

Comparison of the three months ended September 30, 2014 to the three months ended September 30, 2013.

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 151 properties totaling approximately 39.0 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 July 1, 2013 and owned and in service through September 30, 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 July 1, 2013 or disposed of on or prior to September 30, 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 September 30, 2014 and 2013 with respect to the properties that were placed in-service, acquired or consolidated, in development or redevelopment or sold.

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	Same Property Portfolio										Properties Placed In-Service Portfolio					Properties Sold Portfolio				Total Property Portfolio
(dollars in thousands)	2014		2013		Increase/ (Decrease)			% Change			2014		2013			2014		2013		2014			2013			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	570,236	$	546,355	$	23,881			4.37	%	$	14,233	$	76		$	759	$	2,049	$	585,228		$	548,480		$	36,748			6.70	%
Termination Income		8,164		1,380		6,784			491.59	%		—		—			—		—		8,164			1,380			6,784			491.59	%
Total Rental Revenue		578,400		547,735		30,665			5.60	%		14,233		76			759		2,049		593,392			549,860			43,532			7.92	%
Real Estate Operating Expenses		205,416		195,741		9,675			4.94	%		5,391		264			209		375		211,016			196,380			14,636			7.45	%
Net Operating Income, excluding residential and hotel		372,984		351,994		20,990			5.96	%		8,842		(188	)		550		1,674		382,376			353,480			28,896			8.17	%
Residential Net Operating Income(1)		2,134		2,586		(452	)		(17.48	)%		721		—			—		—		2,855			2,586			269			10.40	%
Hotel Net Operating Income(1)		4,333		4,072		261			6.41	%		—		—			—		—		4,333			4,072			261			6.41	%
Consolidated Net Operating Income(1)		379,451		358,652		20,799			5.80	%		9,563		(188	)		550		1,674		389,564			360,138			29,426			8.17	%
Other Revenue:
Development and management services		—		—		—			—			—		—			—		—		6,475			5,475			1,000			18.26	%
Other Expenses:
General and administrative expense		—		—		—			—			—		—			—		—		22,589			24,841			(2,252	)		(9.07	)%
Transaction costs		—		—		—			—			—		—			—		—		1,402			766			636			83.03	%
Depreciation and amortization		150,875		151,935		(1,060	)		(0.70	)%		5,851		109			519		1,209		157,245			153,253			3,992			2.60	%
Total Other Expenses		150,875		151,935		(1,060	)		(0.70	)%		5,851		109			519		1,209		181,236			178,860			2,376			1.33	%
Operating Income		228,576		206,717		21,859			10.57	%		3,712		(297	)		31		465		214,803			186,753			28,050			15.02	%
Other Income:
Income from unconsolidated joint ventures																					4,419			14,736			(10,317	)		(70.01	)%
Gains on consolidation of joint ventures																					—			(1,810	)		1,810			100.00	%
Interest and other income																					3,421			3,879			(458	)		(11.81	)%
Gains (losses) from investments in securities																					(297	)		956			(1,253	)		(131.07	)%
Other Expenses:
Losses from early extinguishments of debt																					—			30			(30	)		(100.00	)%
Interest expense																					113,308			122,173			(8,865	)		(7.26	)%
Income From Continuing Operations																					109,038			82,311			26,727			32.47	%
Discontinued Operations:
Income from discontinued operations																					—			1,677			(1,677	)		(100.00	)%
Gain on sale of real estate from discontinued operations																					—			86,448			(86,448	)		(100.00	)%
Income Before Gains On Sales Of Real Estate																					109,038			170,436			(61,398	)		(36.02	)%
Gains on sales of real estate																					41,937			—			41.937			100.00	%
Net Income																					150,975			170,436			(19,461	)		(11.42	)%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships																					(5,566	)		3,279			(8,845	)		(269.75	)%
Noncontrolling interest—redeemable preferred units of the Operating Partnership																					(75	)		(1,082	)		1,007			93.07	%
Noncontrolling interest—common units of the Operating Partnership																					(14,963	)		(8,339	)		(6,624	)		(79.43	)%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																					—			(8,970	)		8,970			100.00	%
Net Income Attributable to Boston Properties, Inc.																				$	130,371		$	155,324		$	(24,953	)		(16.07	)%
Preferred dividends																					(2,647	)		(2,647	)		—			—	%
Net Income Attributable to Boston Properties, Inc. Common shareholders																				$	127,724		$	152,677		$	(24,953	)		(16.34	)%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 44. Residential Net Operating Income for the three months ended September 30, 2014 and 2013 are comprised of Residential Revenue of $7,018 and $5,493 less Residential Expenses of $4,163 and $2,907, respectively. Hotel Net Operating Income for the three months ended September 30, 2014 and 2013 are comprised of Hotel Revenue of $11,918 and $10,652 less Hotel Expenses of $7,585 and $6,580, 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 $23.9 million for the three months ended September 30, 2014 compared to 2013. The increase was primarily the result of an increase of approximately $22.3 million in revenue from our leases, an increase in parking income of approximately $0.8 million and an increase in other income and recoveries of approximately $0.8 million. Rental revenue from our leases increased approximately $22.3 million as a result of our average revenue per square foot increasing by approximately $2.44, contributing approximately $21.6 million, and an approximately $0.7 million increase due to an increase in average occupancy from 92.7% to 92.8%.

Termination Income

Termination income increased by approximately $6.8 million for the three months ended September 30, 2014 compared to 2013.

Termination income for the three months ended September 30, 2014 related to nine tenants across the Same Property Portfolio and totaled approximately $8.2 million of which approximately $7.7 million related to an initial distribution we received from our unsecured creditor claim against Lehman Brothers, Inc. (See Note 7 of the Consolidated Financial Statements).

Termination income for the three months ended September 30, 2013 related to twelve tenants across the Same Property Portfolio and totaled approximately $1.4 million, of which approximately $1.0 million was negotiated termination income from one of our Reston, Virginia properties in order to accommodate growth of another existing tenant.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $9.7 million for the three months ended September 30, 2014 compared to 2013 due primarily to (1) an increase of approximately $7.3 million, or 8.1%, in real estate taxes, which we primarily experienced in our Washington, DC and New York regions, (2) an increase of approximately $2.3 million, or 7.7%, in repairs and maintenance expense, which we primarily experienced in our Boston region and (3) an increase of approximately $0.1 million, or 0.2%, in other operating expenses.

Depreciation and Amortization Expense

Depreciation and amortization expense for the Same Property Portfolio decreased approximately $1.1 million, or 0.7%, for the three months ended September 30, 2014 compared to 2013.

Properties Placed In-Service Portfolio

We placed in-service or partially placed in-service four properties between July 1, 2013 and September 30, 2014. The square footage amount for the four properties is approximately 1.9 million square feet.

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Rental Revenue

Rental revenue from our Properties Placed In-Service Portfolio increased approximately $15.8 million for the three months ended September 30, 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 September 30,
			2014		2013		Change
			(in thousands)
Office
250 West 55th Street	Third Quarter, 2013	Third Quarter, 2014	$	8,030	$	76	$	7,954
680 Folsom Street	Fourth Quarter, 2013	Third Quarter, 2014		6,203		—		6,203
			$	14,233	$	76	$	14,157
Residential
The Avant at Reston Town Center	Fourth Quarter, 2013	First Quarter, 2014	$	1,616	$	—	$	1,616
Total			$	15,849	$	76	$	15,773

Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $6.0 million for the three months ended September 30, 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 September 30,
			2014		2013		Change
			(in thousands)
Office
250 West 55th Street	Third Quarter, 2013	Third Quarter, 2014	$	3,717	$	264	$	3,453
680 Folsom Street	Fourth Quarter, 2013	Third Quarter, 2014		1,674		—		1,674
			$	5,391	$	264	$	5,127
Residential
The Avant at Reston Town Center	Fourth Quarter, 2013	First Quarter, 2014	$	895	$	—	$	895
Total			$	6,286	$	264	$	6,022

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio increased by approximately $5.7 million for the three months ended September 30, 2014 compared to 2013 due to the additional depreciation expense incurred for the three months ended September 30, 2014 associated with 250 West 55th Street, 680 Folsom Street and The Avant at Reston Town Center that were all fully or partially placed in-service during or subsequent to the three months ended September 30, 2013, and, as a result, we were not recognizing depreciation expense for the full three months ended September 30, 2013.

Properties Sold Portfolio

On July 29, 2014, we completed the sale of our Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on

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sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

On August 22, 2014, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

Rental Revenue

Rental revenue from our Properties Sold Portfolio decreased approximately $1.3 million for the three months ended September 30, 2014 compared to 2013, as detailed below:

Property	Date Sold	Rental Revenue for the three months ended September  30,
		2014		2013		Change
		(in thousands)
Mountain View Technology Park	July 29, 2014	$	358	$	1,094	$	(736	)
Mountain View Research Park Building Sixteen	July 29, 2014		226		589		(363	)
Broad Run Business Park land parcel	August 22, 2014		175		366		(191	)
Total		$	759	$	2,049	$	(1,290	)

Real Estate Operating Expenses

Real estate operating expenses from our Properties Sold Portfolio decreased approximately $166,000 for the three months ended September 30, 2014 compared to 2013, as detailed below:

Property	Date Sold	Real Estate Operating Expenses for the three months ended  September 30,
		2014		2013		Change
		(in thousands)
Mountain View Technology Park	July 29, 2014	$	96	$	192	$	(96	)
Mountain View Research Park Building Sixteen	July 29, 2014		60		92		(32	)
Broad Run Business Park land parcel	August 22, 2014		53		91		(38	)
Total		$	209	$	375	$	(166	)

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Sold Portfolio decreased by approximately $0.7 million for the three months ended September 30, 2014 compared to 2013 due to the additional depreciation expense incurred for the three months ended September 30, 2013 associated with Mountain View Technology Park and Mountain View Research Park Building Sixteen that were both sold on July 29, 2014 and Broad Run Business Park, which was sold on August 22, 2014, and, as a result, we were not recognizing depreciation expense for the full three months ended September 30, 2014.

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Other Operating Income and Expense Items

Residential Net Operating Income

Net operating income for our residential properties increased by approximately $0.3 million for the three months ended September 30, 2014 compared to 2013.

The following reflects our occupancy and rate information for The Lofts at Atlantic Wharf, the Residences on The Avenue and The Avant at Reston Town Center for the three months ended September 30, 2014 and 2013.

	The Lofts at Atlantic Wharf									Residences on The Avenue									The Avant at Reston Town Center(1)
	2014			2013			Percentage Change			2014			2013			Percentage Change			2014			2013		Percentage Change
Average Physical Occupancy(2)		96.9	%		98.8	%		(1.9	)%		91.7	%		92.4	%		(0.8	)%		51.3	%		N/A		N/A
Average Economic Occupancy(3)		96.1	%		97.8	%		(1.7	)%		91.0	%		92.0	%		(1.1	)%		46.8	%		N/A		N/A
Average Monthly Rental Rate(4)	$	3,903		$	3,800			2.7	%	$	3,163		$	3,285			(3.7	)%	$	2,268			N/A		N/A
Average Rental Rate Per Occupied Square Foot	$	4.36		$	4.21			3.6	%	$	3.88		$	4.03			(3.7	)%	$	2.47			N/A		N/A

(1) This property was initially placed in-service during the fourth quarter of 2013 and fully placed in-service during the first quarter of 2014. For the operating results refer to “Results of Operations—Properties Placed in-Service Portfolio” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

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

(3) 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.

(4) 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 Boston Marriott Cambridge (formerly Cambridge Center Marriott) hotel property increased by approximately $0.3 million for the three months ended September 30, 2014 compared to 2013.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge (formerly Cambridge Center Marriott) hotel for the three months ended September 30, 2014 and 2013.

	2014			2013			Percentage Change
Occupancy		87.3	%		87.5	%		(0.2	)%
Average daily rate	$	269.91		$	237.30			13.7	%
Revenue per available room, REVPAR	$	235.51		$	207.60			13.4	%

Development and Management Services

Development and management services income increased approximately $1.0 million for the three months ended September 30, 2014 compared to 2013. Management fee and development fee income each increased approximately $0.5 million. The increase in management fees is due primarily to approximately $0.4 million of

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management, leasing and legal fees from properties and leasing transactions in the Boston and Washington, DC regions and approximately $0.1 million related to an increase in service income. The increase in development fees is primarily due to an increase in fees associated with tenant improvement project management in our New York region.

General and Administrative

General and administrative expenses decreased approximately $2.3 million for the three months ended September 30, 2014 compared to 2013 due primarily to the timing of the recognition of expenses under 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. Because Mr. Zuckerman remained employed by us through July 1, 2014, he is 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 vested in three equal installments on each of March 10, 2013, October 1, 2013 and July 1, 2014. As a result, we recognized approximately $2.6 million of compensation expense during the three months ended September 30, 2013. In addition, we had a decrease of approximately $1.2 million in the value of our deferred compensation plan. These decreases were partially offset by an increase of approximately $0.5 million related to the net effect of the termination of the 2011 OPP Awards and the issuance of the 2014 MYLTIP Units (See Note 11 to the Consolidated Financial Statements) and an increase of approximately $1.0 million in other general and administrative expenses, which includes compensation expense.

Wages directly related to the development and leasing of rental properties are not included in our operating results. These costs are capitalized and included in real estate assets or deferred charges on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Capitalized wages for the three months ended September 30, 2014 and 2013 were approximately $3.4 million and $3.1 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

During the three months ended September 30, 2014, we incurred approximately $1.4 million of transaction costs, which related to (1) approximately $0.4 million for the pending sale of Patriots Park in Reston, Virginia (See Note 13 to the Consolidated Financial Statements), (2) approximately $0.3 million for the formation of the joint venture agreement to sell to a third-party a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston, Massachusetts (See Note 13 to the Consolidated Financial Statements) and (3) approximately $0.7 million related to the pursuit or sale of other assets and the formation of joint venture agreements. During the three months ended September 30, 2013, we incurred approximately $0.8 million of transaction costs of which approximately $0.5 million related to costs for transactions in New York City.

Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the three months ended September 30, 2014 compared to 2013, income from unconsolidated joint ventures decreased by approximately $10.3 million due primarily to an approximately $11.3 million decrease in our share of net income from the sale of the Eighth Avenue and 46th Street project in New York City on July 19, 2013 partially offset by an approximately $1.0 million increase in our share of net income from our other unconsolidated joint ventures, which was primarily related to termination income we received in connection with our Metropolitan Square property in Washington, DC.

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

Gains on Consolidation of Joint Ventures

On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from our Value-Added Fund for an aggregate purchase price of approximately $233.5 million. Prior to the acquisition, our ownership interest in the properties was approximately 39.5%. As a result of the acquisition, we own 100% of the properties and account for them on a consolidated basis. During the three months ended September 30, 2013, we recognized an adjustment to the gain on consolidation totaling approximately $2.1 million.

On May 31, 2013, our two joint venture partners in 767 Venture, LLC (the entity that owns 767 Fifth Avenue in New York City) transferred all of their interests in the joint venture to third parties. In connection with the transfer, we and our new joint venture partners modified our relative decision making authority and consent rights with respect to the joint venture’s assets and operations. These changes resulted in us having sufficient financial and operating control over 767 Venture, LLC such that we now account for the assets, liabilities and operations of 767 Venture, LLC on a consolidated basis in our financial statements instead of under the equity method of accounting. Our ownership interest in 767 Venture, LLC remained unchanged at 60%. During the three months ended September 30, 2013, we recognized a downward adjustment of approximately $3.9 million to the non-cash gain on our investment of approximately $363.4 million, therefore resulting in a non cash gain of approximately $359.5 million. The gain on consolidation resulted from us recognizing the assets, liabilities and equity (including noncontrolling interests) of the joint venture at fair value on the date of consolidation resulting in the recognition of a gain on consolidation equal to the difference between the fair value of our equity interest totaling approximately $721.3 million (as reflected in the business combination table appearing on pages 132 and 133 of the Company’s Form 10-K for the fiscal year ended December 31, 2013) and the carrying value of our previously held equity interest totaling approximately $361.8 million. The fair value was determined based on the purchase price paid by the new joint venture partners through a sales process managed by a major New York City sales brokerage firm.

Interest and Other Income

Interest and other income decreased approximately $0.5 million for the three months ended September 30, 2014 compared to 2013 primarily due to a decrease in the average cash balance and interest rates.

Gains (Losses) from Investments in Securities

Gains (losses) from investments in securities for the three months ended September 30, 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 these deferrals based on the performance of specific investments selected by the officer. In order to reduce our market risk relating to this plan, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer. This enables us to generally match our liabilities to our officers under the deferred compensation plan with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains (losses) from investments in securities. During the three months ended September 30, 2014 and 2013, we recognized gains (losses) of approximately

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$(0.3) million and $1.0 million, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $(0.3) million and $0.9 million during the three months ended September 30, 2014 and 2013, respectively, as a result of increases (decreases) in our liability under our deferred compensation plan that were associated with the performance of the specific investments selected by our officers participating in the plan.

Interest Expense

Interest expense decreased approximately $8.9 million for the three months ended September 30, 2014 compared to 2013 as detailed below:

Component	Change in  interest expense for the three months ended September 30, 2014 compared to September 30, 2013
	(in thousands)
Increases to interest expense due to:
Reduction in capitalized interest	$	5,176
Total increases to interest expense	$	5,176
Decreases to interest expense due to:
Repayment of $747.5 million in aggregate principal of our Operating Partnership’s 3.625% exchangeable senior notes due 2014	$	(7,144	)
Interest expense associated with the adjustment for the equity component allocation of our Operating Partnership’s unsecured exchangeable debt		(4,889	)
Repayment of mortgage financings(1)		(899	)
Amortization of finance fees		(871	)
Other interest expense (excluding senior notes)		(238	)
Total decreases to interest expense	$	(14,041	)
Total change in interest expense	$	(8,865	)

(1) Includes the repayment of New Dominion Technology Park Building Two.

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. As properties are placed in-service, we cease capitalizing interest and interest is then expensed. Interest capitalized for the three months ended September 30, 2014 and 2013 was approximately $12.2 million and $17.4 million, respectively. These costs are not included in the interest expense referenced above.

At September 30, 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 September 30, 2014 and September 30, 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 FASB issued 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

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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 September 30, 2013: 10 & 20 Burlington Mall Road, One Preserve Parkway and 1301 New York Avenue. 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 properties 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. Net cash proceeds totaled approximately $121.5 million, resulting in a gain on sale of approximately $86.4 million. 1301 New York Avenue is a Class A office property totaling approximately 201,000 net rentable square feet. The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented.

Gains on Sales of Real Estate

On July 29, 2014, we completed the sale of our Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

On August 20, 2014, a portion of the land parcel at our One Reston Overlook property located in Reston, Virginia was taken by eminent domain. Net cash proceeds totaled approximately $2.6 million, resulting in a gain on sale of real estate totaling approximately $1.2 million.

On August 22, 2014, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

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Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships increased by approximately $8.8 million for the three months ended September 30, 2014 compared to 2013 as detailed below.

Property	Date of Consolidation	Partners’ noncontrolling interest for the three months ended September 30,
		2014			2013			Change
		(in thousands)
505 9th Street	October 1, 2007	$	562		$	773		$	(211	)
Fountain Square	October 4, 2012		2,327			1,472			855
767 Fifth Avenue (the General Motors Building)	May 31, 2013		(3,789	)		(5,524	)		1,735
Times Square Tower	October 9, 2013		6,466			—			6,466
		$	5,566		$	(3,279	)	$	8,845

Noncontrolling interest—Common Units of the Operating Partnership

Noncontrolling interest-common units of the Operating Partnership increased by approximately $6.6 million for the three months ended September 30, 2014 compared to 2013 due to increases in allocable income and 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;

• redeem on December 15, 2014 $550 million aggregate principal amount of our Operating Partnership’s unsecured senior notes that were scheduled to mature in 2015;

• fund possible property acquisitions; and

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

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;

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• 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 September 30, 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
Annapolis Junction Building Seven (50% ownership)(3)	Third Quarter, 2015	Annapolis, MD		1		125,000	$	12,253	$	17,500		100	%
690 Folsom Street	Fourth Quarter, 2015	San Francisco, CA		1		26,270		10,478		17,900		—	%
804 Carnegie Center	First Quarter, 2016	Princeton, NJ		1		130,000		4,182		40,410		100	%
Annapolis Junction Building Eight (50% ownership)(3)	First Quarter, 2016	Annapolis, MD		1		125,000		10,498		18,500		—	%
99 Third Avenue Retail	Second Quarter, 2016	Waltham, MA		1		16,500		8,110		16,900		84	%
535 Mission Street(4)	Third Quarter, 2016	San Francisco, CA		1		307,000		167,590		215,000		36	%
10 CityPoint	Second Quarter, 2017	Waltham, MA		1		245,000		11,318		100,400		62	%
601 Massachusetts Avenue	Fourth Quarter, 2017	Washington, DC		1		478,000		209,717		360,760		83	%
888 Boylston Street	Fourth Quarter, 2017	Boston, MA		1		425,000		27,137		271,500		30	%
Salesforce Tower (95% ownership)	First Quarter, 2019	San Francisco, CA		1		1,400,000		329,417		1,073,500		51	%
Total Properties under Construction				10		3,277,770	$	790,700	$	2,132,370		54	%

(1) Represents our share. Includes net revenue during lease up period, acquisition expenses and approximately $75.9 million of construction cost and leasing commission accruals.

(2) Represents percentage leased as of November 3, 2014, includes leases with future commencement dates.

(3) This project has a construction loan.

(4) On November 1, 2014, this property was partially placed in-service.

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

Material adverse changes in one or more sources of capital may adversely affect our net cash flows. Such changes, in turn, could adversely affect our ability to fund dividends and distributions, debt service payments and

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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 2019, have remaining costs to fund of approximately $1.3 billion. We also have approximately $165 million (of which our share is approximately $45 million) of secured debt that matures in 2015 and our Operating Partnership has elected to redeem on December 15, 2014 the $300 million and $250 million of its unsecured senior notes that were scheduled to mature on April 15, 2015 and June 1, 2015, respectively. We believe that our strong liquidity, including available cash as of November 3, 2014 of approximately $2.6 billion, which includes approximately $1.9 billion of restricted cash which is being held for possible investment in a like-kind exchange in accordance with Section 1031 of the Internal Revenue Code, the approximately $984 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 also have full availability under our $600 million ATM program. 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 (See “—Sales” and “—Application of Recent Regulations” below).

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 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.

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Application of Recent Regulations

In September of 2013, the Internal Revenue Service released final regulations governing when taxpayers like us must capitalize and depreciate costs for acquiring, maintaining, repairing and replacing tangible property and when they can deduct such costs. These final regulations are effective for tax years beginning on or after January 1, 2014. These regulations would permit us to deduct certain types of expenditures, like most tenant improvements, that were previously required to be capitalized by us. They also allow us to make a one-time election to immediately deduct certain amounts that were capitalized in previous years that are not required to be capitalized under the new regulations. We continue to analyze the application of the new regulations to our business. Although such an election would have no impact on our GAAP financial statements or Funds from Operations, it could materially reduce our taxable income and therefore our dividend payout requirements under applicable REIT tax regulations for 2014. It could also have an impact on our dividend payout requirements in future years, as the amounts deducted in 2014 will no longer be depreciated over time, and amounts expended and deducted in future periods will vary, potentially resulting in more variation in our distribution requirement from year to year depending on our annual cost of now-deductible tenant improvements and other expenses that previously would have been capitalized. There can be no assurance that we will make such an election and, if we do, the amount that we will deduct or the impact, if any, on the dividends declared by our Board of Directors in 2014 or in future taxable years.

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 $0.8 billion and $1.6 billion at September 30, 2014 and 2013, respectively, representing a decrease of approximately $0.8 billion. The following table sets forth changes in cash flows:

	Nine months ended September 30,
	2014			2013			Increase (Decrease)
	(in thousands)
Net cash provided by operating activities	$	469,677		$	550,421		$	(80,744	)
Net cash used in investing activities		(488,256	)		(453,445	)		(34,811	)
Net cash provided by (used in) financing activities		(1,499,894	)		502,321			(2,002,215	)

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 6.8 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 nine months ended September 30, 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 and were 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 the distribution of gains occurs in a different period.

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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 nine months ended September 30, 2014 and 2013 consisted primarily of funding our development projects and the proceeds from the sales of real estate and for the nine months ended September 30, 2013 the acquisition of Mountain View Research and Technology Parks, 535 Mission Street and Salesforce Tower (formerly Transbay Tower) and Reston, Virginia land parcels, as detailed below:

	Nine months ended September 30,
	2014			2013
	(in thousands)
Acquisitions of real estate	$	—		$	(522,900	)
Construction in progress		(305,192	)		(279,786	)
Building and other capital improvements		(57,329	)		(46,805	)
Tenant improvements		(80,692	)		(78,462	)
Proceeds from the sales of real estate		103,542			160,815
Proceeds from sales of real estate placed in escrow		(99,917	)		—
Cash recorded upon consolidation		—			79,468
Repayments of notes receivable, net		—			12,491
Capital contributions to unconsolidated joint ventures		(47,767	)		—
Capital distributions from unconsolidated joint ventures		641			223,067
Investments in securities, net		(1,542	)		(1,333	)
Net cash used in investing activities	$	(488,256	)	$	(453,445	)

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.

• On April 10, 2013, we acquired the Mountain View Research Park and Mountain View Technology Park properties from our Value-Added Fund for an aggregate net purchase price of approximately $233.1 million. Mountain View Research Park is a 16-building complex of Office/Technical properties aggregating approximately 604,000 net rentable square feet. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. In conjunction with the acquisition, the Value-Added Fund repaid the Mountain View Research Park and Mountain View Technology Park properties outstanding loans payable to our Operating Partnership totaling approximately $8.6 million and $3.7 million, respectively. On July 29, 2014, we completed the sale of our Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. We have placed in escrow approximately $90.2 million of the proceeds, which are being held for possible investment in a like-kind exchange in accordance with Section 1031 of the Internal Revenue Code.

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• Construction in progress for the nine months ended September 30, 2013 includes expenditures associated with our continued development and redevelopment of The Avant at Reston Town Center, 250 West 55th Street, 680 Folsom Street, 535 Mission Street, 601 Massachusetts Avenue, Salesforce Tower (formerly Transbay Tower) and expenditures associated with Two Patriots Park, 300 Binney Street (formerly Seventeen Cambridge Center) and the Kendall Center Connector (formerly Cambridge Center Connector), which were fully placed in-service during the nine months ended September 30, 2013. Construction in progress for the nine months ended September 30, 2014 includes ongoing expenditures associated with The Avant at Reston Town Center, 250 West 55th Street and 680 Folsom Street which were fully placed in-service during the nine months ended September 30, 2014. In addition, we incurred costs associated with our continued development of 535 Mission Street, 601 Massachusetts Avenue, 804 Carnegie Center, Salesforce Tower (formerly Transbay Tower), 888 Boylston Street, 10 CityPoint, 99 Third Avenue Retail and 690 Folsom Street.

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

• On 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.

• On August 22, 2014, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease. We have placed in escrow approximately $9.7 million of the proceeds, which are being held for possible investment in a like-kind exchange in accordance with Section 1031 of the Internal Revenue Code.

• On August 20, 2014, a portion of the land parcel at our One Reston Overlook property located in Reston, Virginia was taken by eminent domain. Net cash proceeds totaled approximately $2.6 million, resulting in a gain on sale of real estate totaling approximately $1.2 million.

• On May 31, 2013, we recorded approximately $79.5 million of cash upon consolidating the joint venture that owns 767 Fifth Avenue (the General Motors Building).

• Capital contributions to unconsolidated joint ventures increased due to cash contributions of approximately $39.0 million and approximately $5.4 million to our 501 K Street and Annapolis Junction joint ventures, respectively.

• Capital distributions from unconsolidated joint ventures decreased by approximately $222.4 million due to the sale of 125 West 55th Street in New York City and the Value-Added Fund selling to us Mountain View Research and Technology Parks during the nine months ended September 30, 2013.

Cash used in financing activities for the nine months ended September 30, 2014 totaled approximately $1.5 billion. This consisted primarily of the repayment at maturity of $747.5 million of 3.625% exchangeable senior notes due 2014, the payments of regular and special dividends and distributions to our shareholders and unitholders and repayment of secured mortgage debt. Future debt payments are discussed below under the heading “Capitalization-Debt Financing.”

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Capitalization

At September 30, 2014, our total consolidated debt was approximately $10.5 billion. The GAAP weighted-average annual interest rate on our consolidated indebtedness was 4.46% (with a coupon/stated rate of 5.00%) and the weighted-average maturity was approximately 5.0 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 $30.5 billion at September 30, 2014. Our total consolidated market capitalization was calculated using the September 30, 2014 closing stock price of $115.76 per common share and the following: (1) 153,099,786 shares of our common stock, (2) 16,456,297 outstanding common units of partnership interest in our Operating Partnership (excluding common units held by us), (3) an aggregate of 1,505,386 common units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, (4) 40,440 Series Four Preferred Units of partnership interest in our Operating Partnership multiplied by the fixed liquidation preference of $50 per unit, (5) 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 (6) our consolidated debt totaling approximately $10.5 billion. At September 30, 2014, our total consolidated debt, which excludes debt collateralized by our unconsolidated joint ventures represented approximately 34.37% 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 $9.9 billion at September 30, 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 September 30, 2014 our total adjusted debt represented approximately 33.20% 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.

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.”

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Debt Financing

As of September 30, 2014, we had approximately $10.5 billion of outstanding consolidated indebtedness, representing approximately 34.37% of our total consolidated market capitalization as calculated above consisting of approximately (1) $5.837 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) $4.3 billion of property-specific mortgage debt having a GAAP weighted-average interest rate of 4.30% per annum and weighted-average term of 3.5 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 Operating Partnership’s unsecured senior notes and our Operating Partnership’s Unsecured Line of Credit at September 30, 2014 and September 30, 2013:

	September 30,
	2014			2013
	(dollars in thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable	$	4,328,464		$	4,468,069
Unsecured senior notes, net of discount		5,837,172			5,835,424
Unsecured exchangeable senior notes, net of discount and adjustment for the equity component allocation		—			739,536
Unsecured Line of Credit		—			—
Mezzanine notes payable		310,114			311,340
Total	$	10,475,750		$	11,354,369
Percent of total debt:
Fixed rate		100.00	%		100.00	%
Variable rate		—	%		—	%
Total		100.00	%		100.00	%
GAAP Weighted-average interest rate at end of period:
Fixed rate		4.46	%		4.60	%
Variable rate		—	%		—	%
Total		4.46	%		4.60	%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate		5.00	%		4.94	%
Variable rate		—	%		—	%
Total		5.00	%		4.94	%

Unsecured Line of Credit

On July 26, 2013, our Operating Partnership amended and restated the revolving credit agreement governing its Unsecured Line of Credit, which, among other things, (1) increased the total commitment from $750.0 million to $1.0 billion, (2) extended the maturity date from June 24, 2014 to July 26, 2018 and (3) reduced the per annum variable interest rates and other fees. Our Operating Partnership may increase the total commitment to $1.5 billion, subject to syndication of the increase and other conditions. At our Operating Partnership’s option, loans outstanding under the Unsecured Line of Credit will bear interest at a rate per annum equal to (1) in the case of loans denominated in Dollars, Euro or Sterling, LIBOR or, in the case of loans denominated in Canadian Dollars, CDOR, in each case, plus a margin ranging from 0.925% to 1.70% based on our Operating Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Administrative Agent’s prime rate, (b) the Federal Funds rate plus 0.5% or (c) LIBOR for a one month period plus 1.00%, in each case, plus a margin

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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 September 30, 2014, we had no borrowings and outstanding letters of credit totaling approximately $15.8 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $984.2 million. As of November 3, 2014, we had no borrowings and outstanding letters of credit totaling approximately $16.4 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $983.6 million.

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of September 30, 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(3)
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000		June 1, 2015(4)
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								(12,828	)
Total							$	5,837,172

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

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

(3) On November 3, 2014, our Operating Partnership issued a notice to redeem on December 15, 2014 $300.0 million in aggregate principal amount of its 5.625% senior notes due 2015, which were scheduled to mature on April 15, 2015. The redemption price will equal the sum of (a) the present values as of the redemption date of the remaining scheduled payments of principal and interest from the redemption date to maturity (excluding any accrued and unpaid interest) discounted on a semi-annual basis at a rate equal to the yield to maturity of a comparable United States Treasury security plus 0.35%, plus (b) accrued interest to, but excluding, December 15, 2014, as provided in the applicable indenture. The redemption price will be calculated three business days prior to the redemption date and will be payable on December 15, 2014 in accordance with the terms of the indenture.

(4) On November 3, 2014, our Operating Partnership issued a notice to redeem on December 15, 2014 $250.0 million in aggregate principal amount of its 5.000% senior notes due 2015, which were scheduled to mature on June 1, 2015. The redemption price will equal the sum of (a) the present values as of the redemption date of the remaining scheduled payments of principal and interest from the redemption date to maturity (excluding any accrued and unpaid interest) discounted on a semi-annual basis at a rate equal to the yield to maturity of a comparable United States Treasury security plus 0.25%, plus (b) accrued interest to, but excluding, December 15, 2014, as provided in the applicable indenture. The redemption price will be calculated three business days prior to the redemption date and will be payable on December 15, 2014 in accordance with the terms of the indenture.

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 September 30, 2014, we believe we were in compliance with each of these financial restrictions and requirements.

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Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at September 30, 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	$	131,693	$	1,431,693	(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	%		713,813		—		713,813	(6)	April 10, 2022
John Hancock Tower		5.68	%		5.05	%		640,500		9,583		650,083	(4)(7)	January 6, 2017
Embarcadero Center Four		6.10	%		7.02	%		356,075		—		356,075	(8)	December 1, 2016
Fountain Square		5.71	%		2.56	%		211,250		10,516		221,766	(4)(9)	October 11, 2016
505 9th Street		5.73	%		5.87	%		119,542		—		119,542	(9)	November 1, 2017
New Dominion Tech Park, Bldg. One		7.69	%		7.84	%		40,974		—		40,974		January 15, 2021
Kingstowne Two and Retail		5.99	%		5.61	%		31,697		171		31,868		January 1, 2016
University Place		6.94	%		6.99	%		12,650		—		12,650		August 1, 2021
Total							$	4,176,501	$	151,963	$	4,328,464

(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 or consolidation. All adjustments to reflect loans at their fair value upon acquisition or consolidation 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 September 30, 2014, the maximum funding obligation under the guarantee was approximately $14.8 million. We earn a fee from the joint venture for providing the guarantee and have an agreement with our partners to reimburse the joint venture for their share of any payments made under the guarantee.

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

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

(6) On October 30, 2014, this property was owned by a consolidated joint venture in which we have a 55% interest.

(7) In connection with the mortgage financing we have agreed to guarantee approximately $28.8 million related to our obligation to provide funds for certain tenant re-leasing costs.

(8) 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.

(9) 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 September 30, 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	$	4,114	$	310,114	(2)(3)		October 7, 2017

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(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. The adjustment to reflect the loan at its fair value upon consolidation is 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 $122.1 million at September 30, 2014. The remaining notes payable to the outside joint venture partners and related accrued interest payable totaling $180.0 million and approximately $81.4 million as of September 30, 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 $7.1 million and $21.0 million for the three and nine months ended September 30, 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 September 30, 2014, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $753.7 million (of which our proportionate share is approximately $331.8 million). The table below summarizes the outstanding debt of these joint venture properties at September 30, 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	%		1.65	%		1.82	%	$	120,000	(2)(3)	June 5, 2018
Metropolitan Square		51	%		5.75	%		5.81	%		171,969		May 5, 2020
Market Square North		50	%		4.85	%		4.91	%		128,197		October 1, 2020
Annapolis Junction Building One		50	%		1.90	%		2.06	%		40,853	(4)	March 31, 2018
Annapolis Junction Building Six		50	%		1.80	%		1.99	%		13,911	(5)	November 17, 2014
Annapolis Junction Building Seven		50	%		1.81	%		2.37	%		14,041	(2)(6)	April 4, 2016
Annapolis Junction Building Eight		50	%		1.66	%		2.09	%		8,521	(2)(7)	June 23, 2017
500 North Capitol Street		30	%		4.15	%		4.19	%		105,000	(2)	June 6, 2023
901 New York Avenue		25	%		5.19	%		5.27	%		151,200		January 1, 2015
Total										$	753,692

(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.

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(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 option, subject to certain conditions. On October 24, 2014, the joint venture extended the loan. The extended loan has a total commitment amount of $16.4 million, bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on November 17, 2015.

(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.

(7) The construction financing bears interest at a variable rate equal to LIBOR plus 1.50% per annum and matures on June 23, 2017 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 $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. Through June 9, 2014, $1.375 billion of the Terrorism Coverage for 767 Fifth Avenue in excess of $250 million was provided by NYXP, LLC (“NYXP”), as a direct insurer. After June 9, 2014, all of the Terrorism Coverage for 767 Fifth Avenue has been provided by third party insurers. 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

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Coverage for 601 Lexington Avenue will continue to provide Terrorism Coverage through the expiration of the program on March 1, 2015, (ii) the $1.625 billion property insurance program for 767 Fifth Avenue will continue to provide Terrorism Coverage through the expiration of the program on June 9, 2015, (iii) we will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (iv) 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, (v) we may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (vi) we may not be able to obtain future debt financings secured by individual properties and (vii) we may cancel the insurance policies issued by IXP for the NBCR Coverage. 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 is 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 Salesforce Tower (formerly Transbay Tower) and through October 22, 2014 excluding 535 Mission Street) 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 included a $15 million per occurrence and annual aggregate limit of earthquake coverage through October 22, 2014 after which time 535 Mission Street was included in our portfolio earthquake insurance program. In addition, the builders risk policy maintained for the development of Salesforce Tower in San Francisco includes a $60 million per occurrence and annual aggregate limit of earthquake coverage (increased from $15 million on July 29, 2014). 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, acted as a direct insurer with respect to a portion of our Terrorism Coverage for 767 Fifth Avenue through June 9, 2014. NYXP only insured losses which exceeded the program trigger under TRIA and NYXP reinsured with a third-party insurance company any coinsurance payable under TRIA. Insofar as we own IXP and NYXP, we are responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of our consolidated financial statements. In particular, if a loss occurs which is covered by our NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If we experience a loss and IXP or NYXP are required to pay under their insurance policies, we would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, our Operating Partnership has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

The mortgages on our properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. We provide the lenders on a regular basis with the identity of the insurance companies in our insurance programs. The ratings of some of our insurers are below the rating requirements in some of our loan agreements and the lenders for these loans could attempt to claim an event of default has occurred under the loan. We believe we could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future our ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers or

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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.

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.

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The following table presents a reconciliation of net income attributable to Boston Properties, Inc. common shareholders to FFO for the three months ended September 30, 2014 and 2013:

	Three months  ended September 30,
	2014			2013
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	127,724		$	152,677
Add:
Preferred dividends		2,647			2,647
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		—			8,970
Noncontrolling interest—common units of the Operating Partnership		14,963			8,339
Noncontrolling interest—redeemable preferred units of the Operating Partnership		75			1,082
Noncontrolling interests in property partnerships		5,566			(3,279	)
Less:
Gains on sales of real estate		41,937			—
Income from discontinued operations		—			1,677
Gain on sale of real estate from discontinued operations		—			86,448
Income from continuing operations		109,038			82,311
Add:
Real estate depreciation and amortization(1)		162,012			158,274
Income from discontinued operations		—			1,677
Less:
Gains on sales of real estate included within income from unconsolidated joint ventures		—			11,174
Gains on consolidation of joint ventures		—			(1,810	)
Noncontrolling interests in property partnerships’ share of funds from operations		19,150			9,462
Noncontrolling interest—redeemable preferred units of the Operating Partnership		75			1,082
Preferred distributions		2,647			2,647
Funds from operations attributable to the Operating Partnership	$	249,178		$	219,707
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations		25,775			21,848
Funds from Operations attributable to Boston Properties, Inc.	$	223,403		$	197,859
Boston Properties, Inc.’s percentage share of Funds from Operations—basic		89.66	%		90.06	%
Weighted-average shares outstanding—basic		153,120			152,407

(1) Real estate depreciation and amortization consists of depreciation and amortization from the Consolidated Statements of Operations of $157,245 and $153,253, our share of unconsolidated joint venture real estate depreciation and amortization of $5,099 and $4,389 and depreciation and amortization from discontinued operations of $0 and $940, less corporate related depreciation and amortization of $332 and $308 for the three months ended September 30, 2014 and 2013, respectively.

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Reconciliation to Diluted Funds from Operations:

	Three Months Ended September 30, 2014				Three Months Ended September 30, 2013
	Income (Numerator)		Shares (Denominator)		Income (Numerator)		Shares (Denominator)
	(in thousands)
Basic FFO	$	249,178		170,785	$	219,707		169,236
Effect of Dilutive Securities
Convertible Preferred Units		—		—		850		1,307
Stock Based Compensation		—		153		—		285
Diluted FFO	$	249,178		170,938	$	220,557		170,828
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted FFO		25,751		17,665		21,728		16,829
Boston Properties, Inc.’s share of Diluted FFO(1)	$	223,427		153,273	$	198,829		153,999

(1) Our share of diluted Funds from Operations was 89.67% and 90.15% for the quarter ended September 30, 2014 and 2013, respectively.

Contractual Obligations

We have various 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 third quarter of 2014, we paid approximately $45.4 million to fund tenant-related obligations, including tenant improvements and leasing commissions, and incurred approximately $152.3 million of new tenant-related obligations associated with approximately 1.8 million square feet of second generation leases, or approximately $83 per square foot. In addition, we signed leases for approximately 50,000 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 third quarter of 2014, we signed leases for approximately 1.9 million square feet of space and incurred aggregate tenant-related obligations of approximately $157.4 million, or approximately $83 per square foot.

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ITEM 3—Quantitative and Qualitative Disclosures about Market Risk.

As of September 30, 2014, approximately $10.5 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, See 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	$	18,981		$	80,070		$	659,511		$	2,855,942		$	18,633		$	695,327		$	4,328,464		$	4,460,353
Average Interest Rate		5.66	%		5.87	%		5.31	%		3.91	%		5.52	%		4.94	%		4.38	%
Variable Rate		—			—			—			—			—			—			—			—
	Mezzanine debt
Fixed Rate	$	318		$	1,314		$	1,389		$	307,093		$	—		$	—		$	310,114		$	310,141
Average Interest Rate		—			—			—			5.53	%		—			—			5.53	%
Variable Rate		—			—			—			—			—			—			—			—
	Unsecured debt
Fixed Rate	$	(490	)	$	548,314		$	(1,681	)	$	(1,749	)	$	848,226		$	4,444,552		$	5,837,172		$	6,173,499
Average Interest Rate		—			5.47	%		—			—			3.85	%		4.53	%		4.52	%
Variable Rate		—			—			—			—			—			—			—			—
Total Debt	$	18,809		$	629,698		$	659,219		$	3,161,286		$	866,859		$	5,139,879		$	10,475,750		$	10,943,993

At September 30, 2014, the weighted-average coupon/stated rates on our fixed rate debt was 5.00% per annum. The weighted-average coupon/stated rates for our unsecured debt was 4.44% per annum.

At September 30, 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 third 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 September 30, 2014, we issued an aggregate of 3,810 common shares in exchange for 3,810 common units of limited partnership held by certain limited partners of BPLP. Of these shares, 1,170 were issued in reliance on an exemption from registration under Section 4(2) of the Securities Act of 1933, as amended. We relied on the exemption under Section 4(2) based upon factual representations received from the limited partners who received the common shares.

(b) Not applicable.

(c) Issuer Purchases of Equity Securities. None.

ITEM 3—Defaults Upon Senior Securities.

None.

ITEM 4—Mine Safety Disclosures.

None.

ITEM 5—Other Information.

(a) None.

(b) None.

87

ITEM 6—Exhibits.

(a) Exhibits

2.1	—	Purchase and Sale Agreement by and among NBIM Walker 601 Lex NYC LLC, NBIM Walker 100 Fed BOS LLC, NBIM Walker ATW BOS LLC and Boston Properties Limited Partnership, dated September 16, 2014 (incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on September 18, 2014).
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 September 30, 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.

88

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.
November 7, 2014		/s/    MICHAEL E. LABELLE
		Michael E. LaBelle
		Chief Financial Officer
		(duly authorized officer and
		principal financial officer)

89

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 nine months ended September 30, 2014 and the five years ended December 31, 2013 were as follows:

	Nine Months Ended September 30, 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	$	262,626		$	242,583		$	236,378		$	217,054		$	140,698		$	246,723
Gains on sales of real estate		41,937			—			—			—			2,734			11,760
Amortization of interest capitalized		5,707			5,522			5,278			4,188			2,660			2,498
Distributions from unconsolidated joint ventures		3,130			17,600			20,565			22,451			10,733			6,676
Fixed charges (see below)		388,647			528,116			469,083			449,972			423,224			376,059
Subtract:
Interest capitalized		(44,809	)		(68,152	)		(44,278	)		(48,178	)		(40,981	)		(48,816	)
Preferred distributions of consolidated subsidiaries		(1,014	)		(6,046	)		(3,497	)		(3,339	)		(3,343	)		(3,594	)
Noncontrolling interest in income of a subsidiary that has not incurred fixed charges		(19,895	)		(5,818	)		—			—			—			—
Total earnings	$	636,329		$	713,805		$	683,529		$	642,148		$	535,725		$	591,306
Fixed charges:
Interest expensed	$	337,839		$	447,240		$	413,564		$	394,131		$	378,079		$	322,833
Interest capitalized		44,809			68,152			44,278			48,178			40,981			48,816
Portion of rental expense representative of the interest factor		4,985			6,678			7,744			4,324			821			816
Preferred distributions of consolidated subsidiaries		1,014			6,046			3,497			3,339			3,343			3,594
Total fixed charges	$	388,647		$	528,116		$	469,083		$	449,972		$	423,224		$	376,059
Preferred dividends		7,854			8,057			—			—			—			—
Total combined fixed charges and preferred dividends	$	396,501		$	536,173		$	469,083		$	449,972		$	423,224		$	376,059
Ratio of earnings to fixed charges		1.64			1.35			1.46			1.43			1.27			1.57
Ratio of earnings to combined fixed charges and preferred dividends		1.60			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: November 7, 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: November 7, 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 September 30, 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: November 7, 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 September 30, 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: November 7, 2014

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle

Chief Financial Officer

XML

Commitments And Contingencies (Details) (USD $)	2 Months Ended	7 Months Ended	9 Months Ended		5 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Jul. 28, 2014	Sep. 30, 2014	Sep. 18, 2014	Jun. 09, 2014 767 Venture, LLC [Member]	Sep. 30, 2014 767 Venture, LLC [Member]	Sep. 30, 2014 Lehman [Member]	Dec. 31, 2009 Lehman [Member]	Jan. 10, 2014 Lehman [Member]	Sep. 30, 2014 Lehman [Member] Minimum [Member]	Sep. 30, 2014 Lehman [Member] Maximum [Member]	Sep. 30, 2014 John Hancock Tower [Member]	Sep. 30, 2014 601 Lexington Avenue [Member]
Commitments And Contingencies [Line Items]
Letter of credit and performance obligations	$ 19,100,000		$ 19,100,000
Maximum funding obligation						14,800,000
Guarantee Obligation Related To Tenant Re-Leasing Costs												28,800,000
Maturity Date												Jan. 06, 2017
Bankruptcy claim, amount filed by general creditor								45,300,000
Bankruptcy claim amount allowed by court to creditor							37,500,000		45,200,000
Bankruptcy Claims, Amount of Claims Settled				7,700,000
Bankruptcy claim, price on the private market										0.25	0.26
Bankruptcy claim, denominator used to evaluate claim price amount							1.00
Property insurance program per occurrence limits	1,000,000,000		1,000,000,000			1,625,000,000
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP													250,000,000
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
Per occurrence limit for NBCR Coverage			1,000,000,000
Value of program trigger	100,000,000		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 Salesforce Tower	60,000,000	15,000,000
Operating partnership guarantee to cover liabilities of IXP	$ 20,000,000		$ 20,000,000

XML

Subsequent Events subsequent Events (Details) (USD $)	9 Months Ended															0 Months Ended											0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Nov. 01, 2014 535 Mission Street [Member] Subsequent Event [Member] sqft	Oct. 22, 2014 415 Main Street (formerly Seven Cambridge Center) [Member] Subsequent Event [Member] sqft leaseyear	Nov. 06, 2014 425 Main Street [Member] Subsequent Event [Member]	Jun. 11, 2014 Patriots park [Member] Buildings sqft	Oct. 02, 2014 Patriots park [Member] Subsequent Event [Member] sqft Buildings	Oct. 24, 2014 130 Third Avenue [Member] Subsequent Event [Member] sqft	Sep. 30, 2014 Noncontrolling Interests [Member]	Sep. 30, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Jul. 03, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	May 19, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Nov. 05, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member] Subsequent Event [Member]	Oct. 16, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member] Subsequent Event [Member]	Oct. 24, 2014 Annapolis Junction Building Six [Member] Subsequent Event [Member] sqft	Oct. 24, 2014 Construction Loans [Member] Annapolis Junction Building Six [Member] Subsequent Event [Member]	Oct. 23, 2014 Construction Loans [Member] Annapolis Junction Building Six [Member] Subsequent Event [Member]	Oct. 24, 2014 Construction Loans [Member] Annapolis Junction Building Six [Member] Subsequent Event [Member]	Sep. 16, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member]	Oct. 30, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] Subsequent Event [Member]	Sep. 16, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 601 Lexington Avenue [Member] sqft	Oct. 30, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 601 Lexington Avenue [Member] Subsequent Event [Member] sqft	Sep. 16, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] Atlantic Wharf Office [Member] sqft	Oct. 30, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] Atlantic Wharf Office [Member] Subsequent Event [Member] sqft	Sep. 16, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 100 Federal Street [Member] sqft	Oct. 30, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 100 Federal Street [Member] Subsequent Event [Member] sqft	Sep. 16, 2014 Office Tower [Member] Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 601 Lexington Avenue [Member] floor	Oct. 30, 2014 Office Tower [Member] Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 601 Lexington Avenue [Member] Subsequent Event [Member] floor	Sep. 16, 2014 Low Rise [Member] Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 601 Lexington Avenue [Member] floor	Oct. 30, 2014 Low Rise [Member] Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] 601 Lexington Avenue [Member] Subsequent Event [Member] floor	Nov. 03, 2014 Unsecured Debt [Member] Subsequent Event [Member] 5.625% Unsecured Senior Notes [Member]	Nov. 03, 2014 Unsecured Debt [Member] Subsequent Event [Member] 5% Unsecured Senior Notes [Member]
Subsequent Event [Line Items]
Sales price						$ 321,000,000	$ 321,000,000	$ 14,300,000
Ownership Percentage															50.00%
Construction Loan																		13,900,000
Debt Instrument, Basis Spread on Variable Rate																2.25%	1.65%
Construction Loan Facility Borrowing Capacity																		16,400,000
Debt Instrument, Description of Variable Rate Basis																LIBOR	LIBOR
Area of Real Estate Property			307,000	231,000		706,000	706,000	129,000							119,000						1,669,000	1,669,000	791,000	791,000	1,323,000	1,323,000
Series Four Preferred Units Released from Escrow												319,687		27,773
Redemption of Series Four Preferred Units											16,000,000		1,400,000
Series Four Preferred Units (in shares)									40,440	40,440	40,440		12,667
Purchase Option Price for Real Estate Property				106,000,000
Purchase option date (lease year)				11
Repayments of Secured Debt	82,030,000	96,750,000
Coupon/Stated Rate																															5.625%	5.00%
Number of real estate properties						3	3
Ownership Percentage																			45.00%	45.00%
Gross Sales Price Before Deducting Indebtedness																			1,827,000,000	1,827,000,000
Number of floors real estate																											59	59	6	6
Secured Debt Carrying Value																			712,900,000	712,900,000
Debt Instrument, Repurchased Face Amount																															300,000,000	250,000,000
Basis Points Added to US Treasury Security Used in Redemption Price																															0.35%	0.25%
Non-refundable option payment					$ 1,000,000

XML

Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc., Income (Numerator)	$ 127,724	$ 73,522	$ 258,472	$ 553,436
Net income attributable to Boston Properties Inc., Shares (Denominator)	153,120	152,407	153,077	152,000
Inceom (loss) from continuing operations before discontinued operations and allocation of undistributed earnings (dollars per share)	$ 0.83	$ 0.48	$ 1.69	$ 3.64
Discontinued operations attributable to Boston Properties, Inc., Income (Numerator)		79,155		99,425
Discontinued Operations (in shares)		0		0
Discontinued operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share)	$ 0.00	$ 0.52	$ 0.00	$ 0.65
Allocation of undistributed earnings to participating securities	(63)	(586)		(3,762)
Allocation of undistributed earnings to participating securities (in shares)	0	0		0
Allocation of undistributed earnings to participating securities (per shares)	$ 0	$ 0		$ (0.02)
Net Income Loss Available To Common Stockholders After Discontinued Operations and Allocation of undistributed Earnings,Basic	127,661	152,091		649,099
Net income	$ 0.83	$ 1.00	$ 1.69	$ 4.27
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes, Income (Numerator)	0	0	0	0
Stock Based Compensation and Exchangeable Senior Notes, Shares (Denominator)	153	285	151	381
Stock Based Compensation and Exchangeable Senior Notes, Per Share Amount (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Diluted Earnings:
Diluted Earnings: Net income, Income (Numerator)	$ 127,661	$ 152,091	$ 258,472	$ 649,099
Diluted Earnings: Net income, Shares (Denominator)	153,273	152,692	153,228	152,381
Net income	$ 0.83	$ 1.00	$ 1.69	$ 4.26

XML

Noncontrolling Interests Redeemable interest in property partnership (Narrative) (Details) (Fountain Square [Member], Consolidated Properties [Member], Noncontrolling Interests [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Oct. 04, 2012
Fountain Square [Member] | Consolidated Properties [Member] | Noncontrolling Interests [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
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

Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended													9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Square 407 Limited Partnership [Member]	Sep. 30, 2014 The Metropolitan Square Associates LLC [Member]	Sep. 30, 2014 BP/CRF 901 New York Avenue LLC [Member]		Sep. 30, 2014 WP Project Developer LLC [Member]		Sep. 30, 2014 Annapolis Junction NFM, LLC [Member] Land_Parcels Buildings		Sep. 30, 2014 2 GCT Venture LLC [Member]		Sep. 30, 2014 540 Madison Venture LLC [Member]	Sep. 30, 2014 500 North Capitol LLC [Member]	Sep. 30, 2014 Entity Owning Land And Infrastructure Of Project [Member]	Sep. 30, 2014 501 K Street [Member] payments sqft
Schedule of Equity Method Investments [Line Items]
Properties			Market Square North	Metropolitan Square	901 New York Avenue		Wisconsin Place Land and Infrastructure		Annapolis Junction		N/A		540 Madison Avenue	500 North Capitol Street, NW		501 K Street
Ownership Percentage			50.00%	51.00%	25.00%	[1]	33.30%	[2]	50.00%	[3]	60.00%	[4]	60.00%	30.00%	33.30%	50.00%	[5]
Carrying value of the Company's investments in unconsolidated joint ventures	$ 180,149	$ 126,084	$ (8,540)	$ 8,343	$ (1,436)		$ 46,011		$ 24,484		$ 424		$ 70,418	$ (1,467)		$ 41,912
Number of real estate properties									2
Number of buildings under construction									2
Parcels of undeveloped land									2
Potential additonal payments to joint venture partner																2
Minimum square footage to make a potential additional payment to joint venture partner (in sqft)																520,000

[1] The Company’s economic ownership has increased 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 joint venture owns two in-service buildings, two buildings under construction and two undeveloped land parcels.

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

[5] Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

XML

Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2014

Noncontrolling Interest [Abstract]

Schedule Of redeemable preferred units

The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the nine months ended September 30, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	51,312
Net income	1,014
Distributions	(1,014		)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(33,306		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(15,984		)
Balance at September 30, 2014	$	2,022
Balance at January 1, 2013	$	110,876
Net income	3,385
Distributions	(3,385		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(43,070		)
Balance at September 30, 2013	$	67,806

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 nine months ended September 30, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	99,609
Net loss	(519		)
Distributions	(4,300		)
Adjustment to reflect redeemable interest at redemption value	9,315			(1)
Balance at September 30, 2014	$	104,105
Balance at January 1, 2013	$	97,558
Net loss	(1,523		)
Distributions	(3,935		)
Adjustment to reflect redeemable interest at redemption value	6,549
Balance at September 30, 2013	$	98,649

 _______________ 

(1) Includes an out-of-period adjustment totaling approximately $1.9 million (See Note 2).

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

Noncontrolling Interests (Redeemable Preferred Units) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance			$ 51,312
Net Income	75	1,082	1,014	3,385
Redemption of redeemable preferred units (Series Four Preferred Units)			15,984	43,070
Ending Balance	2,022		2,022
Redeemable Preferred Units [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning Balance			51,312	110,876
Net Income			1,014	3,385
Distributions			(1,014)	(3,385)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units			(33,306)
Redemption of redeemable preferred units (Series Four Preferred Units)			(15,984)	(43,070)
Ending Balance	$ 2,022	$ 67,806	$ 2,022	$ 67,806

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Mortgage Notes Payable (Details) (USD $)	9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Mortgages [Member] New Dominion Technology Park, Bldg. Two [Member]	Jul. 01, 2014 Mortgages [Member] New Dominion Technology Park, Bldg. Two [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 82,030,000	$ 96,750,000	$ 63,000,000
Coupon/Stated Rate				5.55%
Maturity Date			Oct. 01, 2014
Penalty For Early Repayment Of Debt			$ 0

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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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 577,731	$ 534,483	$ 1,666,335	$ 1,450,540
Rental Revenue: Office/Technical	15,661	15,378	47,283	40,121
Rental Revenue: Residential	7,018	5,493	18,998	16,555
Rental Revenue: Hotel	11,918	10,652	32,478	30,061
Total revenue	612,328	566,006	1,765,094	1,537,277
Rental Revenue: % of Grand Totals	100.00%	100.00%	100.00%	100.00%
Rental Expenses: Class A Office	206,743	192,267	599,806	525,187
Rental Expenses: Office/Technical	4,273	4,114	12,546	10,711
Rental Expenses: Residential	4,163	2,907	11,861	8,470
Rental Expenses: Hotel	7,585	6,580	21,697	20,959
Rental Expenses: Total	222,764	205,868	645,910	565,327
Rental Expenses: % Of Grand Totals	100.00%	100.00%	100.00%	100.00%
Net operating Income	389,564	360,138	1,119,184	971,950
Net operating Income: % of Grand Totals	100.00%	100.00%	100.00%	100.00%
Boston [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	176,788	170,415	520,857	495,376
Rental Revenue: Office/Technical	6,056	5,662	17,788	16,853
Rental Revenue: Residential	1,137	1,125	3,389	3,257
Rental Revenue: Hotel	11,918	10,652	32,478	30,061
Total revenue	195,899	187,854	574,512	545,547
Rental Revenue: % of Grand Totals	31.99%	33.19%	32.55%	35.49%
Rental Expenses: Class A Office	69,026	67,228	206,242	195,206
Rental Expenses: Office/Technical	1,901	1,763	5,326	5,177
Rental Expenses: Residential	509	466	1,501	1,316
Rental Expenses: Hotel	7,585	6,580	21,697	20,959
Rental Expenses: Total	79,021	76,037	234,766	222,658
Rental Expenses: % Of Grand Totals	35.47%	36.94%	36.35%	39.38%
Net operating Income	116,878	111,817	339,746	322,889
Net operating Income: % of Grand Totals	30.00%	31.05%	30.36%	33.22%
New York
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	243,033	214,086	684,240	510,767
Rental Revenue: Office/Technical	0	0	0	0
Rental Revenue: Residential	0	0	0	0
Rental Revenue: Hotel	0	0	0	0
Total revenue	243,033	214,086	684,240	510,767
Rental Revenue: % of Grand Totals	39.69%	37.83%	38.76%	33.23%
Rental Expenses: Class A Office	82,335	73,355	231,668	177,800
Rental Expenses: Office/Technical	0	0	0	0
Rental Expenses: Residential	0	0	0	0
Rental Expenses: Hotel	0	0	0	0
Rental Expenses: Total	82,335	73,355	231,668	177,800
Rental Expenses: % Of Grand Totals	36.96%	35.63%	35.86%	31.45%
Net operating Income	160,698	140,731	452,572	332,967
Net operating Income: % of Grand Totals	41.25%	39.08%	40.43%	34.26%
San Francisco [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	61,691	53,841	173,749	159,843
Rental Revenue: Office/Technical	5,892	5,839	18,451	11,317
Rental Revenue: Residential	0	0	0	0
Rental Revenue: Hotel	0	0	0	0
Total revenue	67,583	59,680	192,200	171,160
Rental Revenue: % of Grand Totals	11.04%	10.54%	10.89%	11.13%
Rental Expenses: Class A Office	22,484	20,006	63,078	58,036
Rental Expenses: Office/Technical	1,363	1,287	3,885	2,439
Rental Expenses: Residential	0	0	0	0
Rental Expenses: Hotel	0	0	0	0
Rental Expenses: Total	23,847	21,293	66,963	60,475
Rental Expenses: % Of Grand Totals	10.71%	10.34%	10.37%	10.70%
Net operating Income	43,736	38,387	125,237	110,685
Net operating Income: % of Grand Totals	11.23%	10.66%	11.19%	11.39%
Washington, DC
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	96,219	96,141	287,489	284,554
Rental Revenue: Office/Technical	3,713	3,877	11,044	11,951
Rental Revenue: Residential	5,881	4,368	15,609	13,298
Rental Revenue: Hotel	0	0	0	0
Total revenue	105,813	104,386	314,142	309,803
Rental Revenue: % of Grand Totals	17.28%	18.44%	17.80%	20.15%
Rental Expenses: Class A Office	32,898	31,678	98,818	94,145
Rental Expenses: Office/Technical	1,009	1,064	3,335	3,095
Rental Expenses: Residential	3,654	2,441	10,360	7,154
Rental Expenses: Hotel	0	0	0	0
Rental Expenses: Total	37,561	35,183	112,513	104,394
Rental Expenses: % Of Grand Totals	16.86%	17.09%	17.42%	18.47%
Net operating Income	$ 68,252	$ 69,203	$ 201,629	$ 205,409
Net operating Income: % of Grand Totals	17.52%	19.21%	18.02%	21.13%

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Stockholders' Equity (Details) (USD $)	0 Months Ended		9 Months Ended				0 Months Ended			9 Months Ended				0 Months Ended			9 Months Ended			9 Months Ended
	Apr. 30, 2014	Jan. 29, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 11, 2014	Dec. 31, 2013	Jun. 03, 2014 New ATM program [Member] Y	Sep. 30, 2014 New ATM program [Member]	Jun. 02, 2014 Atm Program [Member]	Sep. 30, 2014 Quarter 4 2013 [Member]	Sep. 30, 2014 Quarter 1 2014 [Member]	Sep. 30, 2014 Quarter 2 2014 [Member]	Sep. 30, 2014 Quarter 3 2014 [Member]	Aug. 15, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	May 15, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Feb. 18, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Sep. 30, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Sep. 11, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Sep. 30, 2014 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 1 2014 [Member]	Sep. 30, 2014 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 2 2014 [Member]	Sep. 30, 2014 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 3 2014 [Member]	Sep. 30, 2014 Series B Cumulative Redeemable Preferred Stock [Member] Quarter 4 2014 [Member]	Mar. 27, 2018 Depository shares of Series B Cumulative Redeemable Preferred [Member]	Sep. 30, 2014 Depository shares of Series B Cumulative Redeemable Preferred [Member]	Mar. 27, 2018 Subsequent Event [Member] Series B Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Common stock, shares outstanding			153,099,786			152,983,101
At the market stock offering program, aggregate value of common stock							$ 600,000,000		$ 600,000,000
At Market Stock Offering Program Maximum Length Of Sale In Years							3
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			70,422
Shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees (in shares)			17,124
Dividend payable date										Jan. 29, 2014	Apr. 30, 2014	Jul. 31, 2014	Oct. 31, 2014							Feb. 18, 2014	May 15, 2014	Aug. 15, 2014	Nov. 17, 2014
Dividend paid on common stock (in dollars per share)	$ 0.65	$ 2.90												$ 32.8125	$ 32.8125	$ 32.8125
Dividend shareholder of record date										Dec. 31, 2013	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2014										Nov. 05, 2014
Dividends payable, date declared													Sep. 11, 2014										Sep. 11, 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					$ 25.00	$ 25.00	$ 2,500.00
Proceeds from Issuance of Series B			0	193,623,000
Ratio of depository shares to shares of Series B Preferred Stock																	0.01
Common Stock, Value, Issued			$ 1,531,000			$ 1,530,000		$ 0

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Basis Of Presentation And Summary Of Significant Accounting Policies

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Basis Of Presentation And Summary Of Significant Accounting Policies

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 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. 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 12).

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 September 30, 2014 and December 31, 2013 (in thousands):

	September 30, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,328,464	$	4,460,353	$	4,449,734		$	4,545,283
Mezzanine notes payable	310,114		310,141		311,040			311,064
Unsecured senior notes	5,837,172		6,173,499		5,835,854			6,050,517
Unsecured exchangeable senior notes	—		—		744,880		(1)	750,266
Total	$	10,475,750	$	10,943,993	$	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.

Out-of-Period Adjustment

During the nine months ended September 30, 2014, the Company recorded an allocation of net income to the noncontrolling interest holder in its Fountain Square consolidated joint venture totaling approximately $1.9 million related to the cumulative non-cash adjustment to the accretion of the changes in the redemption value of the noncontrolling interest. This resulted in the overstatement of Noncontrolling Interests in Property Partnerships by approximately $1.9 million during the nine months ended September 30, 2014 and an understatement of Noncontrolling Interests in Property Partnerships in the aggregate amount of approximately $1.9 million in previous periods prior to 2014. Because this adjustment was not material to the prior periods’ consolidated financial statements and the impact of recording the adjustment in 2014 was not material to the Company’s consolidated financial statements, the Company recorded the related adjustment during the nine months ended September 30, 2014. The out of period adjustment was identified and recorded during the second quarter of 2014.

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.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contract with Customers (Topic 606)" ("ASU 2014-09"). The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying ASU 2014-09, companies will perform a five-step analysis of transactions to determine when and how revenue is recognized. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB's Accounting Standards Codification ("ASC"). ASU 2014-09 is effective for annual reporting periods (including interim periods within that reporting period) beginning after December 15, 2016 and shall be applied using either a full retrospective or modified retrospective approach. Early adoption is not permitted. The Company is currently assessing the potential impact that the adoption of ASU 2014-09 will have on its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period” (“ASU 2014-12”). The amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in ASC Topic No. 718, “Compensation - Stock Compensation” (“ASC 718”), as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in ASU 2014-12 either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Company does not expect the adoption of ASU 2014-12 to have a material impact on its consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, "Presentation of Financial Statements - Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern" (“ASU 2014-15”). ASU 2014-15 requires an entity to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or within one year after the financial statements are available to be issued when applicable) and to provide related footnote disclosures in certain circumstances. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter with early adoption permitted. The Company does not expect the adoption of ASU 2014-15 to have a material impact on its consolidated financial statements.

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(Common Units) (Narrative) (Details) (USD $)	0 Months Ended			9 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 29, 2014	Sep. 30, 2014 Y	Sep. 11, 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)				70,422
Redemption of OP units issued on conversion of LTIP Units (in shares)				67,368
Outperformance Awards LTIP Units distribution as percentage of OP Unit distribution prior to measurement date				10.00%
Distributions made to OP and LTIP units per unit (in dollars per share)	$ 0.65	$ 0.65	$ 0.65
Distribution paid to outperformance awards, OPP Units and MYLTIP Units (in dollars per share)	$ 0.065	$ 0.065	$ 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				$ 2,100,000,000
Closing price of common stock (in dollars per share)				$ 115.76
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]
2014 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
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
Quarter 2 2014 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date				Jul. 31, 2014
Quarter 2 2014 [Member] | OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date				Jul. 31, 2014
Holders of record date				Jun. 30, 2014
Quarter 3 2014 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date				Oct. 31, 2014
Dividends payable, date declared				Sep. 11, 2014
Quarter 3 2014 [Member] | OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend payable date				Oct. 31, 2014
Holders of record date				Sep. 30, 2014
Dividends payable, date declared				Sep. 11, 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
OPP Units 2011 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Accelerated compensation expenses related To 2011 OPP Units				$ 1,200,000

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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]
Cumulative non-cash adjustment to the accretion of the changes in the redemption value of the noncontrolling interest	$ 1.9

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Organization (Details) (USD $)	9 Months Ended												9 Months Ended			9 Months Ended
	Sep. 30, 2014 sqft Vehicles acre Y	Sep. 30, 2013	Sep. 30, 2014 Commercial Real Estate Properties [Member] Real_Estate_Properties sqft	Sep. 30, 2014 Total Properties Under Construction [ Member] Real_Estate_Properties sqft	Sep. 30, 2014 Total Office Properties [ Member] Real_Estate_Properties	Sep. 30, 2014 Class A Office Properties [Member] Real_Estate_Properties	Sep. 30, 2014 Office Properties Under Construction [ Member] Real_Estate_Properties	Sep. 30, 2014 Office Technical Properties [Member] Real_Estate_Properties	Sep. 30, 2014 Hotel Property [ Member] Real_Estate_Properties	Sep. 30, 2014 Retail Properties [ Member] Real_Estate_Properties	Sep. 30, 2014 Retail Properties Under Construction [Member] Real_Estate_Properties	Sep. 30, 2014 Residential Properties [Member] Real_Estate_Properties	Sep. 30, 2014 Series B Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2013 Series B Cumulative Redeemable Preferred Stock [Member]	Sep. 30, 2014 Depository shares of Series B Cumulative Redeemable Preferred [Member]	Sep. 30, 2014 Series Four Preferred Units [Member]	Sep. 30, 2014 Series B Preferred Units [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%	89.20%
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	8,000,000		80,000
Series B, Dividend Rate, Percentage													5.25%
Preferred Units Liquidation Preference																$ 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			172	10	163	132	9	31	1	5	1	3
Net Rentable Area (in sf)			46,400,000	3,300,000
Number of vehicles in structured parking	45,835
Area of parking (in square feet)	15,700,000
Area of undeveloped land parcels owned (in acres)	492.1

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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) (USD $)	9 Months Ended			0 Months Ended		9 Months Ended	0 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	May 31, 2013 767 Fifth Avenue (The GM Building) [Member] Consolidated Properties [Member]	Apr. 10, 2014 Salesforece Tower (formerly Transbay Tower) [Member] Consolidated Properties [Member] sqft	Sep. 30, 2013 Noncontrolling Interests [Member]	May 31, 2013 Noncontrolling Interests [Member] Consolidated Properties [Member] partners	Oct. 09, 2013 Noncontrolling Interests [Member] Time Square Tower [Member] Consolidated Properties [Member] sqft	Feb. 26, 2013 Noncontrolling Interests [Member] Salesforece Tower (formerly Transbay Tower) [Member] Consolidated Properties [Member]	Feb. 07, 2014 Noncontrolling Interests [Member] Salesforece Tower (formerly Transbay Tower) [Member] Consolidated Properties [Member]
Noncontrolling Interest [Line Items]
Property partnerships	$ 716,565,000		$ 726,132,000
Partners Joint Venture Ownership Percentage				40.00%
Ownership Percentage								45.00%	5.00%	50.00%
Sales price								684,000,000
Ownership Percentage by Parent					95.00%				95.00%
Number of Joint Venture Partners							2
Noncontrolling interests recorded upon consolidation	0	480,861,000		480,900,000		480,861,000
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%
Proceeds from sale of an interest in a real estate asset								673,100,000
Area of Real Estate Property					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

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Basis Of Presentation And Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	$ 4,328,464,000	$ 4,449,734,000
Mezzanine notes payable	310,114,000	311,040,000
Unsecured senior notes	5,837,172,000	5,835,854,000
Unsecured exchangeable senior notes	0	744,880,000
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	4,460,353,000	4,545,283,000
Mezzanine notes payable	310,141,000	311,064,000
Unsecured senior notes	6,173,499,000	6,050,517,000
Unsecured exchangeable senior notes	0	750,266,000
Total	10,943,993,000	11,657,130,000
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	4,328,464,000	4,449,734,000
Mezzanine notes payable	310,114,000	311,040,000
Unsecured senior notes	5,837,172,000	5,835,854,000
Unsecured exchangeable senior notes	0	744,880,000	[1]
Total	10,475,750,000	11,341,508,000
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.

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Real Estate Activity During the Nine Months Ended September 30, 2014 (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended															0 Months Ended				0 Months Ended							0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 29, 2014 Mountain View Technology Park and Mountain View Research Building Sixteen [Member]	Aug. 20, 2014 Land at One Reston Overlook [Member]	Aug. 22, 2014 Land Parcel Within Broad Run Business Park [Member]	Aug. 22, 2014 Land Parcel Within Broad Run Business Park [Member] acre	Jun. 11, 2014 Patriots park [Member] Buildings sqft	May 20, 2014 10 CityPoint [Member] sqft	May 20, 2014 888 Boylston Street [Member] sqft	Apr. 03, 2014 690 Folsom Street [Member] sqft	Apr. 01, 2014 99 Third Avenue [Member] sqft	Feb. 10, 2014 The Avant at Reston Town Center Residential [Member] apartments sqft	Jul. 29, 2014 Mountain View Technology [Member] Mountain View Technology Park and Mountain View Research Building Sixteen [Member] Buildings sqft	Jul. 29, 2014 Mountain View Research Building Sixteen [Member] Mountain View Technology Park and Mountain View Research Building Sixteen [Member] sqft	Aug. 31, 2014 250 West 55th Street [Member] sqft	Sep. 17, 2014 680 Folsom Street [Member] sqft	Sep. 16, 2014 Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member]	Apr. 10, 2014 Consolidated Properties [Member] Salesforece Tower (formerly Transbay Tower) [Member] sqft floor	Sep. 16, 2014 Consolidated Properties [Member] 601 Lexington Avenue [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] sqft	Sep. 16, 2014 Consolidated Properties [Member] Atlantic Wharf Office [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] sqft	Sep. 16, 2014 Consolidated Properties [Member] 100 Federal Street [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] sqft	Sep. 16, 2014 Consolidated Properties [Member] Low Rise [Member] 601 Lexington Avenue [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] floor	Sep. 16, 2014 Consolidated Properties [Member] Office Tower [Member] 601 Lexington Avenue [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] floor	Oct. 02, 2014 Subsequent Event [Member] Patriots park [Member] sqft Buildings	Oct. 30, 2014 Subsequent Event [Member] Consolidated Properties [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member]	Oct. 30, 2014 Subsequent Event [Member] Consolidated Properties [Member] 601 Lexington Avenue [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] sqft	Oct. 30, 2014 Subsequent Event [Member] Consolidated Properties [Member] Atlantic Wharf Office [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] sqft	Oct. 30, 2014 Subsequent Event [Member] Consolidated Properties [Member] 100 Federal Street [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] sqft	Oct. 30, 2014 Subsequent Event [Member] Consolidated Properties [Member] Low Rise [Member] 601 Lexington Avenue [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] floor	Oct. 30, 2014 Subsequent Event [Member] Consolidated Properties [Member] Office Tower [Member] 601 Lexington Avenue [Member] 601 Lexington Avenue, Atlantic Wharf Office Building and One Hundred Federal Street [Member] floor
Real Estate Properties [Line Items]
Number of real estate properties									3						7											3
Number of apartment units														359
Area of Real Estate Property									706,000	245,000	425,000	26,000	17,000	355,000	135,000	63,000	988,000	525,000		1,400,000	1,669,000	791,000	1,323,000			706,000		1,669,000	791,000	1,323,000
Sales price					$ 92,100,000			$ 9,800,000	$ 321,000,000																	$ 321,000,000
Ownership Percentage by Parent																				95.00%
Ownership Percentage																			45.00%								45.00%
Square Footage Of Signed Lease																				714,000
Number of floors real estate																				61				6	59						6	59
Secured Debt Carrying Value																			712,900,000								712,900,000
Proceeds from the sales of real estate			103,542,000	160,815,000	91,200,000	2,600,000	9,700,000
Gains on sales of real estate	41,937,000	0	41,937,000	0	36,400,000	1,200,000	4,300,000
Area of Land								15.5
Gross Sales Price Before Deducting Indebtedness																			$ 1,827,000,000								$ 1,827,000,000

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Organization

9 Months Ended

Sep. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

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 September 30, 2014 owned an approximate 89.5% (89.2% at September 30, 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 Notes 8 and 11). 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 8 and 11).

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 9).

At September 30, 2014, there were two series of Preferred Units outstanding (i.e., Series Four Preferred Units and Series B Preferred Units).

• The Series Four Preferred Units are not convertible into or exchangeable for any security 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 Notes 8 and 13).

• 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 9).

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 September 30, 2014, the Company owned or had interests in a portfolio of 172 commercial real estate properties (the “Properties”) aggregating approximately 46.4 million net rentable square feet, including ten properties under construction totaling approximately 3.3 million net rentable square feet. In addition, the Company has structured parking for approximately 45,835 vehicles containing approximately 15.7 million square feet. At September 30, 2014, the Properties consist of:

• 163 office properties, including 132 Class A office properties (including nine properties under construction) and 31 Office/Technical properties;

• one hotel;

• five retail properties (including one property under construction); and

• three residential properties.

The Company owns or controls undeveloped land parcels totaling approximately 492.1 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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Real Estate Activity During the Nine Months Ended September 30, 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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	$ 618,803	$ 571,481	$ 1,783,291	$ 1,559,340
Expenses
Depreciation and amortization	157,245	153,253	466,143	406,162
Total expenses	404,000	384,728	1,190,318	1,076,212
Operating income	214,803	186,753	592,973	483,128
Other expense
Interest expense	113,308	122,173	337,839	325,746
Income from discontinued operations	0	1,677	0	7,486
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership	0	(8,970)	0	(11,450)
Income from discontinued operations attributable to Boston Properties, Inc.		79,155		99,425
Gain on sale of real estate from discontinued operations	0	86,448	0	86,448
Gain on forgiveness of debt from discontinued operations	0	0	0	20,182
Impairment loss from discontinued operations	0	0	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				17,962
Expenses
Operating				6,290
Depreciation and amortization				3,826
Total expenses				10,116
Operating income				7,846
Other expense
Interest expense				360
Income from discontinued operations				7,486
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership				(752)
Income from discontinued operations attributable to Boston Properties, Inc.				6,734
Gain on sale of real estate from discontinued operations				86,448
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				(10,698)
Gain on forgiveness of debt and impairment losses from discontinued operations attributable to Boston Properties, Inc.				92,691
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		4,112
Expenses
Operating		1,495
Depreciation and amortization		940
Total expenses		2,435
Operating income		1,677
Other expense
Interest expense		0
Income from discontinued operations		1,677
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership		(167)
Income from discontinued operations attributable to Boston Properties, Inc.		1,510
Gain on sale of real estate from discontinued operations		86,448
Gain on forgiveness of debt from discontinued operations		0
Impairment loss from discontinued operations		0
Noncontrolling interest in gain on forgiveness of debt from discontinued operations - common units of the Operating Partnership		(8,803)
Gain on forgiveness of debt and impairment losses from discontinued operations attributable to Boston Properties, Inc.		$ 77,645

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Noncontrolling Interests (Narrative) (Details)	Sep. 30, 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)	16,456,297
Long-Term Incentive Plan (LTIP) Units (in shares)	1,505,386
Series Four Preferred Units (in shares)	40,440
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]
2014 MYLTIP	483,555

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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Operating Income	$ 214,803	$ 186,753	$ 592,973	$ 483,128
Development and management services income	6,475	5,475	18,197	22,063
Income from unconsolidated joint ventures	4,419	14,736	10,069	72,240
Gains on consolidation of joint ventures	0	(1,810)	0	385,991
Interest and other income	3,421	3,879	6,841	6,646
Gains (losses) from investments in securities	(297)	956	651	1,872
Gains (losses) from early extinguishments of debt	0	(30)	0	122
Gain on sale of real estate from discontinued operations	0	86,448	0	86,448
Gain on forgiveness of debt from discontinued operations	0	0	0	20,182
Gains on sales of real estate	41,937	0	41,937	0
General and administrative expense	22,589	24,841	75,765	94,673
Transaction costs	1,402	766	2,500	1,744
Depreciation and amortization expense	157,245	153,253	466,143	406,162
Interest expense	113,308	122,173	337,839	325,746
Impairment loss	0	0	0	8,306
Impairment loss from discontinued operations	0	0	0	3,241
Noncontrolling interest in property partnerships	5,566	(3,279)	17,473	(924)
Noncontrolling interest-redeemable preferred units of the Operating Partnership	75	1,082	1,014	3,385
Noncontrolling interest-common units of the Operating Partnership	14,963	8,339	29,819	62,945
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	0	8,970	0	11,450
Net income attributable to Boston Properties, Inc.	130,371	155,324	266,326	658,272
Business Intersegment, Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Operating Income	389,564	360,138	1,119,184	971,950
Development and management services income	6,475	5,475	18,197	22,063
Income from unconsolidated joint ventures	4,419	14,736	10,069	72,240
Gains on consolidation of joint ventures	0	(1,810)	0	385,991
Interest and other income	3,421	3,879	6,841	6,646
Gains (losses) from investments in securities	(297)	956	651	1,872
Gains (losses) from early extinguishments of debt	0	(30)	0	122
Income from discontinued operations	0	1,677	0	7,486
Gain on sale of real estate from discontinued operations	0	86,448	0	86,448
Gain on forgiveness of debt from discontinued operations	0	0	0	20,182
Gains on sales of real estate	41,937	0	41,937	0
General and administrative expense	22,589	24,841	75,765	94,673
Transaction costs	1,402	766	2,500	1,744
Depreciation and amortization expense	157,245	153,253	466,143	406,162
Interest expense	113,308	122,173	337,839	325,746
Impairment loss	0	0	0	8,306
Impairment loss from discontinued operations	0	0	0	3,241
Noncontrolling interest in property partnerships	5,566	(3,279)	17,473	(924)
Noncontrolling interest-redeemable preferred units of the Operating Partnership	75	1,082	1,014	3,385
Noncontrolling interest-common units of the Operating Partnership	14,963	8,339	29,819	62,945
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	0	8,970	0	11,450
Net income attributable to Boston Properties, Inc.	$ 130,371	$ 155,324	$ 266,326	$ 658,272

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Real estate, at cost	$ 18,362,993	$ 17,158,210
Construction in progress	715,609	1,523,179
Land held for future development	276,804	297,376
Less: accumulated depreciation	(3,469,130)	(3,161,571)
Total real estate	15,886,276	15,817,194
Cash and cash equivalents	846,664	2,365,137
Cash held in escrows	153,161	57,201
Investments in securities	18,834	16,641
Tenant and other receivables (net of allowance for doubtful accounts of $1,080 and $1,636, respectively)	43,210	59,464
Accrued rental income (net of allowance of $7,397 and $3,636, respectively)	689,885	651,603
Deferred charges, net	837,907	884,450
Prepaid expenses and other assets	219,074	184,477
Investments in unconsolidated joint ventures	180,149	126,084
Total assets	18,875,160	20,162,251
Liabilities:
Mortgage notes payable	4,328,464	4,449,734
Unsecured senior notes (net of discount of $12,828 and $14,146, respectively)	5,837,172	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	310,114	311,040
Outside members' notes payable	180,000	180,000
Accounts payable and accrued expenses	253,600	202,470
Dividends and distributions payable	112,708	497,242
Accrued interest payable	181,954	167,523
Other liabilities	517,428	578,969
Total liabilities	11,721,440	12,967,712
Commitments and contingencies	0	0
Noncontrolling interests:
Redeemable preferred units of the Operating Partnership	2,022	51,312
Redeemable interest in property partnership	104,105	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 $2,500 per share, 92,000 shares authorized, 80,000 shares issued and outstanding at September 30, 2014 and December 31, 2013	200,000	200,000
Common stock, $.01 par value, 250,000,000 shares authorized, 153,178,686 and 153,062,001 issued and 153,099,786 and 152,983,101 outstanding at September 30, 2014 and December 31, 2013, respectively	1,531	1,530
Additional paid-in capital	5,684,649	5,662,453
Dividends in excess of earnings	(148,566)	(108,552)
Treasury common stock at cost, 78,900 shares at September 30, 2014 and December 31, 2013	(2,722)	(2,722)
Accumulated other comprehensive loss	(9,866)	(11,556)
Total stockholders’ equity attributable to Boston Properties, Inc.	5,725,026	5,741,153
Noncontrolling interests:
Common units of the Operating Partnership	606,002	576,333
Property partnerships	716,565	726,132
Total equity	7,047,593	7,043,618
Total liabilities and equity	$ 18,875,160	$ 20,162,251

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Noncontrolling Interests Noncontrolling Redeemable Property Partnerships (Details) (USD $)	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Noncontrolling Interest Redeemable Property Partnership [Abstract]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ (1,900,000)
Beginning Balance	99,609,000		97,558,000
Net Loss for Redeemable interest in Property Partnership	(519,000)		(1,523,000)
Distributions on Redeemable Property Partnership	(4,300,000)		(3,935,000)
Adjustment to Reflect Redeemable Interest at Redemption Value	9,315,000	[1]	6,549,000
Ending Balance	$ 104,105,000		$ 98,649,000

[1] Includes an out-of-period adjustment totaling approximately $1.9 million (See Note 2).

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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]
Redemption of operating partnership units to Common Stock, shares		337,000
Redemption of operating partnership units to Common Stock, value	0	4		10,402				(10,406)
Conversions of redeemable preferred units to common units	0
Allocated net income for the year	726,717				658,272			68,445
Dividends/distributions declared	(336,037)				(302,081)
Dividends/distributions declared								(33,956)
Issuance of 5.25% Series B cumulative redeemable preferred stock	193,623		200,000	(6,377)
Sale of common stock, net of offering costs		0
Sale of common stock, net of offering costs		0
Shares issued in connection with exchange of Exchangeable Senior Notes, shares		419,000
Shares issued in connection with exchange of Exchangeable Senior Notes, value	43,834	4		43,830
Equity component of exchange of Exchangeable Senior Notes	(43,869)			(43,869)
Shares issued pursuant to stock purchase plan, shares		6,000
Shares issued pursuant to stock purchase plan, value	681			681
Net activity from stock option and incentive plan, shares		28,000
Net activity from stock option and incentive plan, value	30,632	0		6,510				24,122
Noncontrolling interests in property partnerships recorded upon consolidation	480,861							480,861
Contributions from noncontrolling interests in property partnerships	10,932							10,932
Distributions to noncontrolling interests in property partnerships	(2,250)							(2,250)
Amortization of interest rate contracts	1,884						1,695	189
Reallocation of noncontrolling interest	0			16,924				(16,924)
Equity, value at Sep. 30, 2013	6,741,862	1,524	200,000	5,250,174	246,206	(2,722)	(12,122)	1,058,802
Equity, shares at Sep. 30, 2013		152,391,000
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]
Redemption of operating partnership units to Common Stock, shares		70,000
Redemption of operating partnership units to Common Stock, value		1		2,367				(2,368)
Conversions of redeemable preferred units to common units	33,306							33,306
Allocated net income for the year	304,822				266,326			38,496
Dividends/distributions declared	(340,766)				(306,340)
Dividends/distributions declared								(34,426)
Shares issued in connection with exchange of Exchangeable Senior Notes, value	0
Shares issued pursuant to stock purchase plan, shares		7,000
Shares issued pursuant to stock purchase plan, value	761			761
Net activity from stock option and incentive plan, shares		40,000
Net activity from stock option and incentive plan, value	22,215			5,177				17,038
Noncontrolling interests in property partnerships recorded upon consolidation	0
Contributions from noncontrolling interests in property partnerships	2,980							2,980
Distributions to noncontrolling interests in property partnerships	(21,224)							(21,224)
Amortization of interest rate contracts	1,881						1,690	191
Reallocation of noncontrolling interest				13,891				(13,891)
Equity, value at Sep. 30, 2014	$ 7,047,593	$ 1,531	$ 200,000	$ 5,684,649	$ (148,566)	$ (2,722)	$ (9,866)	$ 1,322,567
Equity, shares at Sep. 30, 2014	153,099,786	153,100,000

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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 618,803,000		$ 571,481,000		$ 1,783,291,000		$ 1,559,340,000
Expenses
Depreciation and amortization	157,245,000		153,253,000		466,143,000		406,162,000
Total expenses	404,000,000		384,728,000		1,190,318,000		1,076,212,000
Operating income	214,803,000		186,753,000		592,973,000		483,128,000
Other expense
Interest expense	113,308,000		122,173,000		337,839,000		325,746,000
Losses on Extinguishment of Debt	0		30,000		0		(122,000)
Income from continuing operations	109,038,000		82,311,000		272,695,000		624,253,000
Net income	150,975,000		170,436,000		314,632,000		735,128,000
Income from unconsolidated joint ventures	4,419,000		14,736,000		10,069,000		72,240,000
Gains on consolidation of joint ventures	0		(1,810,000)		0		385,991,000
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	41,958,000	[1]	37,983,000	[1]	118,429,000	[1]	273,464,000	[1]
Expenses
Operating	15,516,000		14,963,000		46,441,000		89,826,000
Depreciation and amortization	9,429,000		9,784,000		27,688,000		76,202,000
Total expenses	24,945,000		24,747,000		74,129,000		166,028,000
Operating income	17,013,000		13,236,000		44,300,000		107,436,000
Other expense
Interest expense	7,950,000		8,148,000		23,946,000		104,436,000
Losses on Extinguishment of Debt	0		0		0		1,677,000
Income from continuing operations	9,063,000		5,088,000		20,354,000		1,323,000
Gain on sale or real estate	0		12,441,000		0		14,207,000
Net income	9,063,000		17,529,000		20,354,000		15,530,000
Company's share of net income (loss)	4,200,000		3,149,000		9,403,000		1,974,000
Gain on sale of real estate	0		11,174,000		0		54,501,000
Basis differential	219,000		413,000		666,000		(1,213,000)
Elimination of inter-entity interest on partner loan	0		0		0		16,978,000
Income from unconsolidated joint ventures	4,419,000		14,736,000		10,069,000		72,240,000
Gains on consolidation of joint ventures	0		(1,810,000)		0		385,991,000
Straight-line rent adjustments	200,000		600,000		1,100,000		7,600,000
"Above" and "below" market rent adjustments, net	$ (100,000)		$ (100,000)		$ (100,000)		$ 33,900,000

[1] Includes straight-line rent adjustments of $0.2 million and $0.6 million for the three months ended September 30, 2014 and 2013, respectively, and $1.1 million and $7.6 million for the nine months ended September 30, 2014 and 2013, respectively. Includes net below-market rent adjustments of $(0.1) million and $(0.1) million for the three months ended September 30, 2014 and 2013, respectively, and $(0.1) million and $33.9 million for the nine months ended September 30, 2014 and 2013, respectively.

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

9 Months Ended

Sep. 30, 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 September 30, 2014 and December 31, 2013 (in thousands):

	September 30, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,328,464	$	4,460,353	$	4,449,734		$	4,545,283
Mezzanine notes payable	310,114		310,141		311,040			311,064
Unsecured senior notes	5,837,172		6,173,499		5,835,854			6,050,517
Unsecured exchangeable senior notes	—		—		744,880		(1)	750,266
Total	$	10,475,750	$	10,943,993	$	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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Investments in Unconsolidated Joint Ventures investment in Unconsolidated Joint Ventures (Narrative) (Details) (USD $)	9 Months Ended		0 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Apr. 10, 2014 501 K Street [Member] sqft	Sep. 30, 2014 501 K Street [Member] payments sqft		Jun. 23, 2014 Annapolis Junction Building Eight [Member] Y	Apr. 30, 2014 Annapolis Junction Building Eight [Member] sqft	Apr. 10, 2014 joint venture partner [Member] 501 K Street [Member]	Apr. 10, 2014 Company [Member] 501 K Street [Member]	Apr. 30, 2014 Company [Member] Annapolis Junction Building Eight [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis						LIBOR plus 1.50%
Capital contributions to unconsolidated joint ventures	$ 47,767,000	$ 0	$ 39,000,000				$ 5,400,000
Ownership Percentage				50.00%	[1]			50.00%	50.00%	50.00%
Net Rentable Area (in sf)			520,000				125,000
Construction Loan Facility Borrowing Capacity						$ 26,000,000
Debt Instrument, Basis Spread on Variable Rate						1.50%
Maturity Date						Jun. 23, 2017
Number of extensions						2
Extension Option (in years)						1
Potential additonal payments to joint venture partner				2
Minimum square footage to make a potential additional payment to joint venture partner (in sqft)				520,000

[1] Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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Investments in Unconsolidated Joint Ventures (Tables)

9 Months Ended

Sep. 30, 2014

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at September 30, 2014:

Entity	Properties	Nominal % Ownership			Carrying Value of Investment
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.0	%		$	(8,540	)
The Metropolitan Square Associates LLC	Metropolitan Square	51.0	%		8,343
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0	%	(1)	(1,436		)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3	%	(2)	46,011
Annapolis Junction NFM, LLC	Annapolis Junction	50.0	%	(3)	24,484
2 GCT Venture LLC	N/A	60.0	%	(4)	424
540 Madison Venture LLC	540 Madison Avenue	60.0	%		70,418
500 North Capitol LLC	500 North Capitol Street, NW	30.0	%		(1,467		)
501 K Street LLC	501 K Street	50.0	%	(5)	41,912
					$	180,149

 _______________

(1) The Company’s economic ownership has increased 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 joint venture owns two in-service buildings, two buildings under construction and two undeveloped land parcels.

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

(5) Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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:

	September 30, 2014			December 31, 2013
	(in thousands)
ASSETS
Real estate and development in process, net	$	1,014,663		$	924,297
Other assets	182,905			163,149
Total assets	$	1,197,568		$	1,087,446
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	753,692		$	749,732
Other liabilities	23,180			28,830
Members’/Partners’ equity	420,696			308,884
Total liabilities and members’/partners’ equity	$	1,197,568		$	1,087,446
Company’s share of equity	$	208,125		$	154,726
Basis differentials (1)	(27,976		)	(28,642		)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	180,149		$	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 September 30,					For the nine months ended September 30,
	2014		2013			2014		2013
	(in thousands)
Total revenue (1)	$	41,958	$	37,983		$	118,429	$	273,464
Expenses
Operating	15,516		14,963			46,441		89,826
Depreciation and amortization	9,429		9,784			27,688		76,202
Total expenses	24,945		24,747			74,129		166,028
Operating income	17,013		13,236			44,300		107,436
Other expense
Interest expense	7,950		8,148			23,946		104,436
Losses from early extinguishment of debt	—		—			—		1,677
Income from continuing operations	9,063		5,088			20,354		1,323
Gains on sales of real estate	—		12,441			—		14,207
Net income	$	9,063	$	17,529		$	20,354	$	15,530
Company’s share of net income	$	4,200	$	3,149		$	9,403	$	1,974
Gains on sales of real estate	—		11,174			—		54,501
Basis differential	219		413			666		(1,213		)
Elimination of inter-entity interest on partner loan	—		—			—		16,978
Income from unconsolidated joint ventures	$	4,419	$	14,736		$	10,069	$	72,240
Gains on consolidation of joint ventures	$	—	$	(1,810	)	$	—	$	385,991

 _______________ 

(1) Includes straight-line rent adjustments of $0.2 million and $0.6 million for the three months ended September 30, 2014 and 2013, respectively, and $1.1 million and $7.6 million for the nine months ended September 30, 2014 and 2013, respectively. Includes net below-market rent adjustments of $(0.1) million and $(0.1) million for the three months ended September 30, 2014 and 2013, respectively, and $(0.1) million and $33.9 million for the nine months ended September 30, 2014 and 2013, respectively.

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 314,632	$ 735,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	466,143	409,988
Non-cash compensation expense	22,708	39,001
Impairment loss	0	8,306
Income from unconsolidated joint ventures	(10,069)	(72,240)
Gains on consolidation of joint ventures	0	(385,991)
Distributions of net cash flow from operations of unconsolidated joint ventures	3,130	29,607
Gains from investments in securities	(651)	(1,872)
Non-cash portion of interest expense	(28,753)	29,149
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes	(92,979)	(56,532)
Gains from early extinguishments of debt	0	(264)
Gains on sales of real estate	(41,937)	0
Gain on sale of real estate from discontinued operations	0	(86,448)
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	3,957	4,017
Tenant and other receivables, net	16,254	3,628
Accrued rental income, net	(42,180)	(44,636)
Prepaid expenses and other assets	(34,804)	(41,245)
Accounts payable and accrued expenses	4,237	9,179
Accrued interest payable	14,431	35,089
Other liabilities	(60,795)	(9,352)
Tenant leasing costs	(63,647)	(37,150)
Total adjustments	155,045	(184,707)
Net cash provided by operating activities	469,677	550,421
Cash flows from investing activities:
Acquisitions of real estate	0	(522,900)
Construction in progress	(305,192)	(279,786)
Building and other capital improvements	(57,329)	(46,805)
Tenant improvements	(80,692)	(78,462)
Proceeds from the sales of real estate	103,542	160,815
Proceeds from sales of real estate placed in escrow	(99,917)	0
Cash recorded upon consolidation	0	79,468
Repayments of notes receivable, net	0	12,491
Capital contributions to unconsolidated joint ventures	(47,767)	0
Capital distributions from unconsolidated joint ventures	641	223,067
Investments in securities, net	(1,542)	(1,333)
Net cash used in investing activities	(488,256)	(453,445)
Cash flows from financing activities:
Repayments of mortgage notes payable	(82,030)	(96,750)
Proceeds from unsecured senior notes	0	1,194,753
Repayment/redemption of unsecured exchangeable senior notes	(654,521)	(393,468)
Deferred financing costs	(31)	(15,180)
Net proceeds from preferred stock issuance	0	193,623
Net proceeds from equity transactions	1,530	(348)
Redemption of preferred units	(15,984)	(43,070)
Dividends and distributions	(726,314)	(337,440)
Contributions from noncontrolling interests in property partnerships	2,980	6,386
Distributions to noncontrolling interests in property partnerships	(25,524)	(6,185)
Net cash provided by (used in) financing activities	(1,499,894)	502,321
Net increase (decrease) in cash and cash equivalents	(1,518,473)	599,297
Cash and cash equivalents, beginning of period	2,365,137	1,041,978
Cash and cash equivalents, end of period	846,664	1,641,275
Supplemental disclosures:
Cash paid for interest	489,949	368,652
Interest capitalized	44,809	50,252
Non-cash investing and financing activities:
Additions to real estate included in accounts payable and accrued expenses	20,016	6,397
Real estate and related intangibles recorded upon consolidation	0	3,356,000
Debt recorded upon consolidation	0	2,056,000
Working capital recorded upon consolidation	0	170,748
Noncontrolling interests recorded upon consolidation	0	480,861
Investment in unconsolidated joint venture eliminated upon consolidation	0	361,808
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	112,708	112,470
Issuance of common stock in connection with the exchange of exchangeable senior notes	0	43,834
Conversions of noncontrolling interests to stockholders’ equity	2,368	10,406
Conversions of redeemable preferred units to common units	33,306	0
Issuance of restricted securities to employees	$ 27,445	$ 30,077

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Tenant and other receivables, allowance for doubtful accounts	$ 1,080	$ 1,636
Accrued rental income, allowance	7,397	3,636
Unsecured senior notes, discount	12,828	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	153,178,686	153,062,001
Common stock, shares outstanding	153,099,786	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	$ 0.01
Preferred stock, shares authorized	92,000	92,000
Series B Dividend Rate Percentage	5.25%	5.25%
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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Earnings Per Share

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Earnings Per Share

10. 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 September 30, 2014
	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.	$	127,724		153,120	$	0.83
Allocation of undistributed earnings to participating securities	(63		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	127,661		153,120	$	0.83
Effect of Dilutive Securities:
Stock Based Compensation	—			153	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	127,661		153,273	$	0.83
	For the three months ended September 30, 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.	$	73,522		152,407	$	0.48
Discontinued operations attributable to Boston Properties, Inc.	79,155			—	0.52
Allocation of undistributed earnings to participating securities	(586		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	152,091		152,407	$	1.00
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			285	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	152,091		152,692	$	1.00
	For the nine months ended September 30, 2014
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	258,472		153,077	$	1.69
Effect of Dilutive Securities:
Stock Based Compensation	—			151	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	258,472		153,228	$	1.69
	For the nine months ended September 30, 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.	$	553,436		152,000	$	3.64
Discontinued operations attributable to Boston Properties, Inc.	99,425			—	0.65
Allocation of undistributed earnings to participating securities	(3,762		)	—	(0.02		)
Net income attributable to Boston Properties, Inc. common shareholders	$	649,099		152,000	$	4.27
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			381	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	649,099		152,381	$	4.26

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Document And Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 03, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
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		153,099,786

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Stock Option and Incentive Plan

9 Months Ended

Sep. 30, 2014

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

Stock Option and Incentive Plan

11. 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 FASB's 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. As a result, the Company accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million during the nine months ended September 30, 2014. Accordingly, all 2011 OPP Unit awards were automatically forfeited.

During the nine months ended September 30, 2014, the Company issued 23,968 shares of restricted common stock, no non-qualified stock options, 127,094 LTIP Units and 485,459 2014 MYLTIP Units to employees and non-employee directors under the 2012 Plan. Employees and non-employee directors 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 nine months ended September 30, 2014 were valued at approximately $2.6 million ($109.27 per share weighted-average). The LTIP Units granted were valued at approximately $12.8 million ($100.61 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 $5.0 million and $6.2 million for the three months ended September 30, 2014 and 2013, respectively, and approximately $21.0 million and $38.1 million for the nine months ended September 30, 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 and nine months ended September 30, 2013, stock-based compensation expense includes approximately $1.6 million and $20.2 million, respectively, 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 September 30, 2014, there was $19.7 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $16.5 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 2.9 years.

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue
Base rent	$ 484,071	$ 449,636	$ 1,402,328	$ 1,221,874
Recoveries from tenants	90,103	80,718	253,419	213,358
Parking and other	26,236	25,000	76,869	71,984
Total rental revenue	600,410	555,354	1,732,616	1,507,216
Hotel revenue	11,918	10,652	32,478	30,061
Development and management services	6,475	5,475	18,197	22,063
Total revenue	618,803	571,481	1,783,291	1,559,340
Expenses
Rental	215,179	199,288	624,213	544,368
Hotel	7,585	6,580	21,697	20,959
General and administrative	22,589	24,841	75,765	94,673
Transaction costs	1,402	766	2,500	1,744
Impairment loss	0	0	0	8,306
Depreciation and amortization	157,245	153,253	466,143	406,162
Total expenses	404,000	384,728	1,190,318	1,076,212
Operating income	214,803	186,753	592,973	483,128
Other income (expense)
Income from unconsolidated joint ventures	4,419	14,736	10,069	72,240
Gains on consolidation of joint ventures	0	(1,810)	0	385,991
Interest and other income	3,421	3,879	6,841	6,646
Gains (losses) from investments in securities	(297)	956	651	1,872
Gains (losses) from early extinguishments of debt	0	(30)	0	122
Interest expense	(113,308)	(122,173)	(337,839)	(325,746)
Income from continuing operations	109,038	82,311	272,695	624,253
Discontinued operations
Income from discontinued operations	0	1,677	0	7,486
Gain on sale of real estate from discontinued operations	0	86,448	0	86,448
Gain on forgiveness of debt from discontinued operations	0	0	0	20,182
Impairment loss from discontinued operations	0	0	0	(3,241)
Income before gains on sales of real estate	109,038	170,436	272,695	735,128
Gains on sales of real estate	41,937	0	41,937	0
Net income	150,975	170,436	314,632	735,128
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(5,566)	3,279	(17,473)	924
Noncontrolling interest—redeemable preferred units of the Operating Partnership	(75)	(1,082)	(1,014)	(3,385)
Noncontrolling interest—redeemable preferred units of the Operating Partnership	(14,963)	(8,339)	(29,819)	(62,945)
Noncontrolling interest—common units of the Operating Partnership	0	(8,970)	0	(11,450)
Net income attributable to Boston Properties, Inc.	130,371	155,324	266,326	658,272
Preferred dividends	(2,647)	(2,647)	(7,854)	(5,411)
Net income attributable to Boston Properties, Inc. common shareholders	$ 127,724	$ 152,677	$ 258,472	$ 652,861
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$ 0.83	$ 0.48	$ 1.69	$ 3.62
Discontinued operations	$ 0.00	$ 0.52	$ 0.00	$ 0.65
Net income	$ 0.83	$ 1.00	$ 1.69	$ 4.27
Weighted average number of common shares outstanding	153,120	152,407	153,077	152,000
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Income from continuing operations	$ 0.83	$ 0.48	$ 1.69	$ 3.61
Discontinued operations	$ 0.00	$ 0.52	$ 0.00	$ 0.65
Net income	$ 0.83	$ 1.00	$ 1.69	$ 4.26
Weighted average number of common and common equivalent shares outstanding	153,273	152,692	153,228	152,381

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Mortgage Notes Payable (Notes)

9 Months Ended

Sep. 30, 2014

Mortgage Notes Payable [Abstract]

Mortgage Notes Payable Disclosure [Text Block]

5. Mortgage Notes Payable

On July 1, 2014, the Company used available cash to repay the mortgage loan collateralized by its New Dominion Technology Park Building Two property located in Herndon, Virginia totaling $63.0 million. The mortgage loan bore interest at a fixed rate of 5.55% per annum and was scheduled to mature on October 1, 2014. There was no prepayment penalty.

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Investments in Unconsolidated Joint Ventures

9 Months Ended

Sep. 30, 2014

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

4. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at September 30, 2014:

Entity	Properties	Nominal % Ownership			Carrying Value of Investment
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.0	%		$	(8,540	)
The Metropolitan Square Associates LLC	Metropolitan Square	51.0	%		8,343
BP/CRF 901 New York Avenue LLC	901 New York Avenue	25.0	%	(1)	(1,436		)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.3	%	(2)	46,011
Annapolis Junction NFM, LLC	Annapolis Junction	50.0	%	(3)	24,484
2 GCT Venture LLC	N/A	60.0	%	(4)	424
540 Madison Venture LLC	540 Madison Avenue	60.0	%		70,418
500 North Capitol LLC	500 North Capitol Street, NW	30.0	%		(1,467		)
501 K Street LLC	501 K Street	50.0	%	(5)	41,912
					$	180,149

 _______________

(1) The Company’s economic ownership has increased 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 joint venture owns two in-service buildings, two buildings under construction and two undeveloped land parcels.

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

(5) Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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:

	September 30, 2014			December 31, 2013
	(in thousands)
ASSETS
Real estate and development in process, net	$	1,014,663		$	924,297
Other assets	182,905			163,149
Total assets	$	1,197,568		$	1,087,446
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	753,692		$	749,732
Other liabilities	23,180			28,830
Members’/Partners’ equity	420,696			308,884
Total liabilities and members’/partners’ equity	$	1,197,568		$	1,087,446
Company’s share of equity	$	208,125		$	154,726
Basis differentials (1)	(27,976		)	(28,642		)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	180,149		$	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 September 30,					For the nine months ended September 30,
	2014		2013			2014		2013
	(in thousands)
Total revenue (1)	$	41,958	$	37,983		$	118,429	$	273,464
Expenses
Operating	15,516		14,963			46,441		89,826
Depreciation and amortization	9,429		9,784			27,688		76,202
Total expenses	24,945		24,747			74,129		166,028
Operating income	17,013		13,236			44,300		107,436
Other expense
Interest expense	7,950		8,148			23,946		104,436
Losses from early extinguishment of debt	—		—			—		1,677
Income from continuing operations	9,063		5,088			20,354		1,323
Gains on sales of real estate	—		12,441			—		14,207
Net income	$	9,063	$	17,529		$	20,354	$	15,530
Company’s share of net income	$	4,200	$	3,149		$	9,403	$	1,974
Gains on sales of real estate	—		11,174			—		54,501
Basis differential	219		413			666		(1,213		)
Elimination of inter-entity interest on partner loan	—		—			—		16,978
Income from unconsolidated joint ventures	$	4,419	$	14,736		$	10,069	$	72,240
Gains on consolidation of joint ventures	$	—	$	(1,810	)	$	—	$	385,991

 _______________ 

(1) Includes straight-line rent adjustments of $0.2 million and $0.6 million for the three months ended September 30, 2014 and 2013, respectively, and $1.1 million and $7.6 million for the nine months ended September 30, 2014 and 2013, respectively. Includes net below-market rent adjustments of $(0.1) million and $(0.1) million for the three months ended September 30, 2014 and 2013, respectively, and $(0.1) million and $33.9 million for the nine months ended September 30, 2014 and 2013, respectively.

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 a 50% interest in the joint venture and the Company contributed cash of approximately $39.0 million for its 50% interest. Under the joint venture agreement, the partner will be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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 to the joint venture. 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. In addition, on June 23, 2014, the joint venture obtained construction financing collateralized by the development project totaling $26.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.50% per annum and matures on June 23, 2017, with two, one-year extension options, subject to certain conditions.

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Real Estate Activity During the Nine Months Ended September 30, 2014 (Tables)

9 Months Ended

Sep. 30, 2014

Real Estate [Abstract]

Summary of the Discontinued Operations Related To Montvale Center, 303 Almaden Blvd, 1301 New York Avenue, 10 & 20 Burlington Mall Road, One Preserve Parkway and Bedford Business Par

The following table summarizes the income from discontinued operations for the three and nine months ended September 30, 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 sale of real estate, gain on forgiveness of debt and impairment loss:

	For the three months ended September 30,			For the nine months ended September 30,
	2013			2013
	(in thousands)
Total revenue	$	4,112		$	17,962
Expenses
Operating	1,495			6,290
Depreciation and amortization	940			3,826
Total expenses	2,435			10,116
Operating income	1,677			7,846
Other expense
Interest expense	—			360
Income from discontinued operations	$	1,677		$	7,486
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership	(167		)	(752		)
Income from discontinued operations attributable to Boston Properties, Inc.	$	1,510		$	6,734
Gain on sale of real estate from discontinued operations	$	86,448		$	86,448
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	(8,803		)	(10,698		)
Gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	77,645		$	92,691

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Segment Information

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Segment Information

12. 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. Therefore, the operations for the Princeton region have been included in the New York region. Accordingly, amounts reflected below for the New York region have been adjusted to reflect the Company's retrospective inclusion of the Princeton region 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 (losses) from investments in securities, gains (losses) from early extinguishments of debt, income from unconsolidated joint ventures, gains on consolidation of joint ventures, discontinued operations, gains on sales of real estate 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. The Company's management also uses Net Operating Income to evaluate regional property level performance and to make decisions about resource allocations. Further, the Company believes Net Operating Income is useful to investors as a performance measure because, when compared across periods, Net Operating Income 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.

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 September 30, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	176,788		$	243,033		$	61,691		$	96,219		$	577,731
Office/Technical	6,056			—			5,892			3,713			15,661
Residential	1,137			—			—			5,881			7,018
Hotel	11,918			—			—			—			11,918
Total	195,899			243,033			67,583			105,813			612,328
% of Grand Totals	31.99		%	39.69		%	11.04		%	17.28		%	100.00		%
Rental Expenses:
Class A Office	69,026			82,335			22,484			32,898			206,743
Office/Technical	1,901			—			1,363			1,009			4,273
Residential	509			—			—			3,654			4,163
Hotel	7,585			—			—			—			7,585
Total	79,021			82,335			23,847			37,561			222,764
% of Grand Totals	35.47		%	36.96		%	10.71		%	16.86		%	100.00		%
Net operating income	$	116,878		$	160,698		$	43,736		$	68,252		$	389,564
% of Grand Totals	30.00		%	41.25		%	11.23		%	17.52		%	100.00		%

For the three months ended September 30, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	170,415		$	214,086		$	53,841		$	96,141		$	534,483
Office/Technical	5,662			—			5,839			3,877			15,378
Residential	1,125			—			—			4,368			5,493
Hotel	10,652			—			—			—			10,652
Total	187,854			214,086			59,680			104,386			566,006
% of Grand Totals	33.19		%	37.83		%	10.54		%	18.44		%	100.00		%
Rental Expenses:
Class A Office	67,228			73,355			20,006			31,678			192,267
Office/Technical	1,763			—			1,287			1,064			4,114
Residential	466			—			—			2,441			2,907
Hotel	6,580			—			—			—			6,580
Total	76,037			73,355			21,293			35,183			205,868
% of Grand Totals	36.94		%	35.63		%	10.34		%	17.09		%	100.00		%
Net operating income	$	111,817		$	140,731		$	38,387		$	69,203		$	360,138
% of Grand Totals	31.05		%	39.08		%	10.66		%	19.21		%	100.00		%

For the nine months ended September 30, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	520,857		$	684,240		$	173,749		$	287,489		$	1,666,335
Office/Technical	17,788			—			18,451			11,044			47,283
Residential	3,389			—			—			15,609			18,998
Hotel	32,478			—			—			—			32,478
Total	574,512			684,240			192,200			314,142			1,765,094
% of Grand Totals	32.55		%	38.76		%	10.89		%	17.80		%	100.00		%
Rental Expenses:
Class A Office	206,242			231,668			63,078			98,818			599,806
Office/Technical	5,326			—			3,885			3,335			12,546
Residential	1,501			—			—			10,360			11,861
Hotel	21,697			—			—			—			21,697
Total	234,766			231,668			66,963			112,513			645,910
% of Grand Totals	36.35		%	35.86		%	10.37		%	17.42		%	100.00		%
Net operating income	$	339,746		$	452,572		$	125,237		$	201,629		$	1,119,184
% of Grand Totals	30.36		%	40.43		%	11.19		%	18.02		%	100.00		%

For the nine months ended September 30, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	495,376		$	510,767		$	159,843		$	284,554		$	1,450,540
Office/Technical	16,853			—			11,317			11,951			40,121
Residential	3,257			—			—			13,298			16,555
Hotel	30,061			—			—			—			30,061
Total	545,547			510,767			171,160			309,803			1,537,277
% of Grand Totals	35.49		%	33.23		%	11.13		%	20.15		%	100.00		%
Rental Expenses:
Class A Office	195,206			177,800			58,036			94,145			525,187
Office/Technical	5,177			—			2,439			3,095			10,711
Residential	1,316			—			—			7,154			8,470
Hotel	20,959			—			—			—			20,959
Total	222,658			177,800			60,475			104,394			565,327
% of Grand Totals	39.38		%	31.45		%	10.70		%	18.47		%	100.00		%
Net operating income	$	322,889		$	332,967		$	110,685		$	205,409		$	971,950
% of Grand Totals	33.22		%	34.26		%	11.39		%	21.13		%	100.00		%

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

	Three months ended September 30,						Nine months ended September 30,
	2014			2013			2014		2013
	(in thousands)
Net Operating Income	$	389,564		$	360,138		$	1,119,184	$	971,950
Add:
Development and management services income	6,475			5,475			18,197		22,063
Income from unconsolidated joint ventures	4,419			14,736			10,069		72,240
Gains on consolidation of joint ventures	—			(1,810		)	—		385,991
Interest and other income	3,421			3,879			6,841		6,646
Gains (losses) from investments in securities	(297		)	956			651		1,872
Gains (losses) from early extinguishments of debt	—			(30		)	—		122
Income from discontinued operations	—			1,677			—		7,486
Gain on sale of real estate from discontinued operations	—			86,448			—		86,448
Gain on forgiveness of debt from discontinued operations	—			—			—		20,182
Gains on sales of real estate	41,937			—			41,937		—
Less:
General and administrative expense	22,589			24,841			75,765		94,673
Transaction costs	1,402			766			2,500		1,744
Depreciation and amortization expense	157,245			153,253			466,143		406,162
Interest expense	113,308			122,173			337,839		325,746
Impairment loss	—			—			—		8,306
Impairment loss from discontinued operations	—			—			—		3,241
Noncontrolling interest in property partnerships	5,566			(3,279		)	17,473		(924		)
Noncontrolling interest—redeemable preferred units of the Operating Partnership	75			1,082			1,014		3,385
Noncontrolling interest—common units of the Operating Partnership	14,963			8,339			29,819		62,945
Noncontrolling interest in discontinued operations—common units of the Operating Partnership	—			8,970			—		11,450
Net income attributable to Boston Properties, Inc.	$	130,371		$	155,324		$	266,326	$	658,272

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Noncontrolling Interests

9 Months Ended

Sep. 30, 2014

Noncontrolling Interest [Abstract]

Noncontrolling Interests

8. 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 September 30, 2014, the noncontrolling interests in the Operating Partnership consisted of 16,456,297 OP Units, 1,505,386 LTIP Units, 394,590 2012 OPP Units, 314,974 2013 MYLTIP Units, 483,555 2014 MYLTIP Units and 40,440 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

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 elected to convert such units into 1.312336 OP Units, or an aggregate of 874,168 OP Units, on or before May 12, 2014. As of May 12, 2014, the holders of all remaining 666,116 Series Two Preferred Units converted such units into an aggregate of 874,168 OP Units. The Series Two Preferred Units bore 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 were convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). In connection with the conversion of the remaining Series Two Preferred Units in May 2014, the Operating Partnership paid accrued and unpaid distributions which included the special cash distribution on an as-converted basis. On February 18, 2014, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.85302 per unit. Due to the holders' redemption option existing outside the control of the Company, the Series Two Preferred Units were presented outside of permanent equity in the Company's Consolidated Balance Sheets.

The Preferred Units at September 30, 2014 consisted of 40,440 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. 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. In order to secure the performance of certain post-issuance obligations by the holders, all of such outstanding Series Four Preferred Units were subject to forfeiture pursuant to the terms of a pledge agreement and not eligible for redemption until and unless such security interest is released. On May 19, 2014, the Company's Operating Partnership released to the holders 319,687 Series Four Preferred Units that were previously subject to the security interest. On July 3, 2014, the Company's Operating Partnership redeemed such units for cash totaling approximately $16.0 million, plus accrued and unpaid distributions. An aggregate of 40,440 Series Four Preferred Units remain outstanding and subject to the security interest under the pledge agreement (See Note 13). 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. On May 15, 2014, the Operating Partnership paid a distribution on its outstanding Series Four Preferred Units of $0.25 per unit. On August 15, 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 nine months ended September 30, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	51,312
Net income	1,014
Distributions	(1,014		)
Conversion of redeemable preferred units (Series Two Preferred Units) to common units	(33,306		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(15,984		)
Balance at September 30, 2014	$	2,022
Balance at January 1, 2013	$	110,876
Net income	3,385
Distributions	(3,385		)
Redemption of redeemable preferred units (Series Four Preferred Units)	(43,070		)
Balance at September 30, 2013	$	67,806

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 nine months ended September 30, 2014 and 2013 (in thousands):

Balance at January 1, 2014	$	99,609
Net loss	(519		)
Distributions	(4,300		)
Adjustment to reflect redeemable interest at redemption value	9,315			(1)
Balance at September 30, 2014	$	104,105
Balance at January 1, 2013	$	97,558
Net loss	(1,523		)
Distributions	(3,935		)
Adjustment to reflect redeemable interest at redemption value	6,549
Balance at September 30, 2013	$	98,649

 _______________ 

(1) Includes an out-of-period adjustment totaling approximately $1.9 million (See Note 2).

Noncontrolling Interest—Common Units of the Operating Partnership

During the nine months ended September 30, 2014, 70,422 OP Units were presented by the holders for redemption (including 67,368 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 September 30, 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. As a result, the Company accelerated the then remaining unrecognized compensation expense totaling approximately $1.2 million during the nine months ended September 30, 2014. 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 quarterly cash distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a regular quarterly 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. On April 30, 2014, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on March 31, 2014. On July 31, 2014, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.65 per unit, and a distribution on the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units in the amount of $0.065 per unit, to holders of record as of the close of business on June 30, 2014. On September 11, 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 October 31, 2014 to holders of record as of the close of business on September 30, 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) had all of such units been redeemed at September 30, 2014 was approximately $2.1 billion based on the closing price of the Company’s common stock of $115.76 per share on September 30, 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 $716.6 million at September 30, 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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Unsecured Exchangeable Senior Notes Unsecured Exchangeable Senior Notes

9 Months Ended

Sep. 30, 2014

Unsecured Exchangeable Senior Notes [Abstract]

Unsecured Exchangeable Senior Notes

6. 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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Commitments And Contingencies

9 Months Ended

Sep. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

7. 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 $19.1 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 8). Under certain of the Company's joint venture agreements, if certain return thresholds are achieved the partners will be entitled to an additional promoted interest or payments.

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 September 30, 2014, the maximum funding obligation under the guarantee was approximately $14.8 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 $28.8 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 approximately $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 the business of Lehman Brothers allowed the Company’s claim in the amount of approximately $45.2 million. On September 18, 2014, the Company received an initial distribution totaling approximately $7.7 million, which is included in Base Rent in the accompanying Consolidated Statements of Operations for the three and nine months ended September 30, 2014, leaving a remaining claim of approximately $37.5 million. Recently, claims of similar priority to that of the Company's remaining claim were quoted privately within a range of $0.25 to $0.26 per $1.00. The Company will continue to evaluate whether to attempt to sell the remaining claim or wait until the trustee distributes proceeds from the Lehman estate. Given the inherent uncertainties in bankruptcy proceedings, there can be no assurance as to the timing or amount of proceeds, if any, that the Company may ultimately realize on the remaining claim, whether by sale to a third party or by one or more distributions from the trustee. Accordingly, the Company has not recorded any estimated recoveries associated with this gain contingency within its consolidated financial statements at September 30, 2014.

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. Through June 9, 2014, $1.375 billion of the Terrorism Coverage for 767 Fifth Avenue in excess of $250 million was provided by NYXP, LLC (“NYXP”), as a direct insurer. After June 9, 2014, all of the Terrorism Coverage for 767 Fifth Avenue has been provided by third party insurers. 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 $1.625 billion property insurance program for 767 Fifth Avenue will continue to provide Terrorism Coverage through the expiration of the program on June 9, 2015, (iii) the Company will evaluate alternative approaches to secure coverage for acts of terrorism thereby potentially increasing our overall cost of insurance, (iv) 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, (v) the Company may not satisfy the insurance requirements under existing or future debt financings secured by individual properties, (vi) the Company may not be able to obtain future debt financings secured by individual properties and (vii) the Company may cancel the insurance policies issued by IXP for the NBCR Coverage. 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 is 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 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 Salesforce Tower in San Francisco includes a $60 million per occurrence and annual aggregate limit of earthquake coverage (increased from $15 million on July 29, 2014). 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, acted as a direct insurer with respect to a portion of the Company’s Terrorism Coverage for 767 Fifth Avenue through June 9, 2014. NYXP only insured losses which exceeded the program trigger under TRIA and NYXP reinsured 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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Stockholders' Equity

9 Months Ended

Sep. 30, 2014

Equity [Abstract]

Stockholders' Equity

9. Stockholders’ Equity

As of September 30, 2014, the Company had 153,099,786 shares of Common Stock outstanding.

On June 3, 2014, the Company established a new “at the market” (ATM) stock offering program through which it may sell from time to time up to an aggregate of $600.0 million of its common stock through sales agents over a three-year period. This program replaced the Company’s prior $600.0 million ATM stock offering program that expired on June 2, 2014 with approximately $305.3 million of unsold common stock. The Company intends to use the net proceeds from any offering for general business purposes, which may include investment opportunities and debt reduction. No shares of common stock have been issued under this new ATM stock offering program.

During the nine months ended September 30, 2014, the Company issued 70,422 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from third parties.

During the nine months ended September 30, 2014, the Company issued 17,124 shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees.

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 April 30, 2014, the Company paid a dividend of $0.65 per share of Common Stock to shareholders of record as of the close of business on March 31, 2014. On July 31, 2014, the Company paid a dividend of $0.65 per share of Common Stock to shareholders of record as of the close of business on June 30, 2014. On September 11, 2014, the Company's Board of Directors declared a dividend of $0.65 per share of Common Stock payable on October 31, 2014 to shareholders of record as of the close of business on September 30, 2014.

As of September 30, 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 pays 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 May 15, 2014, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On August 15, 2014, the Company paid a dividend on its outstanding Series B Preferred Stock of $32.8125 per share. On September 11, 2014, the Company's Board of Directors declared a dividend of $32.8125 per share of Series B Preferred Stock payable on November 17, 2014 to shareholders of record as of the close of business on November 5, 2014.

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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Real estate and development in process, net	$ 15,886,276		$ 15,817,194
Mortgage and notes payable	4,328,464		4,449,734
Other liabilities	517,428		578,969
Total liabilities and equity	18,875,160		20,162,251
Carrying value of the Company's investments in unconsolidated joint ventures	180,149		126,084
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Real estate and development in process, net	1,014,663		924,297
Other assets	182,905		163,149
Total assets	1,197,568		1,087,446
Mortgage and notes payable	753,692		749,732
Other liabilities	23,180		28,830
Members'/Partners' equity	420,696		308,884
Total liabilities and equity	1,197,568		1,087,446
Company's share of equity	208,125		154,726
Basis differentials	(27,976)	[1]	(28,642)	[1]
Carrying value of the Company's investments in unconsolidated joint ventures	$ 180,149		$ 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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Segment Information Segment Information (narrative) (Details) (767 Fifth Avenue (The GM Building) [Member], Consolidated Properties [Member])	0 Months Ended
	May 31, 2013 partners
767 Fifth Avenue (The GM Building) [Member] | Consolidated Properties [Member]
Segment Reporting Information [Line Items]
Number of Joint Venture Partners	2

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

9 Months Ended

Sep. 30, 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.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contract with Customers (Topic 606)" ("ASU 2014-09"). The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying ASU 2014-09, companies will perform a five-step analysis of transactions to determine when and how revenue is recognized. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB's Accounting Standards Codification ("ASC"). ASU 2014-09 is effective for annual reporting periods (including interim periods within that reporting period) beginning after December 15, 2016 and shall be applied using either a full retrospective or modified retrospective approach. Early adoption is not permitted. The Company is currently assessing the potential impact that the adoption of ASU 2014-09 will have on its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period” (“ASU 2014-12”). The amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in ASC Topic No. 718, “Compensation - Stock Compensation” (“ASC 718”), as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in ASU 2014-12 either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Company does not expect the adoption of ASU 2014-12 to have a material impact on its consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, "Presentation of Financial Statements - Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern" (“ASU 2014-15”). ASU 2014-15 requires an entity to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or within one year after the financial statements are available to be issued when applicable) and to provide related footnote disclosures in certain circumstances. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter with early adoption permitted. The Company does not expect the adoption of ASU 2014-15 to have a material impact on its consolidated financial statements.

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Share

	For the three months ended September 30, 2014
	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.	$	127,724		153,120	$	0.83
Allocation of undistributed earnings to participating securities	(63		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	127,661		153,120	$	0.83
Effect of Dilutive Securities:
Stock Based Compensation	—			153	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	127,661		153,273	$	0.83
	For the three months ended September 30, 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.	$	73,522		152,407	$	0.48
Discontinued operations attributable to Boston Properties, Inc.	79,155			—	0.52
Allocation of undistributed earnings to participating securities	(586		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	152,091		152,407	$	1.00
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			285	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	152,091		152,692	$	1.00
	For the nine months ended September 30, 2014
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	258,472		153,077	$	1.69
Effect of Dilutive Securities:
Stock Based Compensation	—			151	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	258,472		153,228	$	1.69
	For the nine months ended September 30, 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.	$	553,436		152,000	$	3.64
Discontinued operations attributable to Boston Properties, Inc.	99,425			—	0.65
Allocation of undistributed earnings to participating securities	(3,762		)	—	(0.02		)
Net income attributable to Boston Properties, Inc. common shareholders	$	649,099		152,000	$	4.27
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes	—			381	(0.01		)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	649,099		152,381	$	4.26

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Stock Option and Incentive Plan (Restricted Stock) (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	153,178,686		153,178,686		153,062,001
Stock based Compensation Expense	$ 5,000,000	$ 6,200,000	$ 21,000,000	$ 38,100,000
Common Stock, Value, Issued	1,531,000		1,531,000		1,530,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	23,968		23,968
Employee and director payment per share (in dollars per share)			$ 0.01
Common Stock, Value, Issued	2,600,000		2,600,000
Employee's weighted average cost per share (in dollars per share)	$ 109.27		$ 109.27
LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units issued (in shares)	127,094		127,094
Value of LTIP units issued			12,800,000
Per unit fair value weighted-average (in dollars per share)	$ 100.61		$ 100.61
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 2011 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		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	19,700,000		19,700,000
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 2012 OPP Units and 2013 and 2014 MYLTIPS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses	16,500,000		16,500,000
Weighted-average period (years)	2 years 10 months 24 days
Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based Compensation Expense		$ 1,600,000		$ 20,200,000

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Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified		0 Months Ended	4 Months Ended		9 Months Ended
	Sep. 30, 2014 Noncontrolling Interests [Member]	Mar. 11, 2014 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	May 12, 2014 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Feb. 18, 2014 Series Two Preferred Units [Member] Noncontrolling Interests [Member]	Sep. 30, 2014 Series Four Preferred Units [Member]	Sep. 30, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Aug. 15, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Jul. 03, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	May 19, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	May 15, 2014 Series Four Preferred Units [Member] Noncontrolling Interests [Member]	Feb. 18, 2014 Series Four 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		$ 50.00	$ 50.00
Series Four Preferred Units Released from Escrow									319,687
Redemption of Series Four Preferred Units								$ 16.0
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	874,168
Distributions to Series Two Preferred Units (in dollars per share)				$ 0.85302			$ 0.25			$ 0.25	$ 0.25
Series Four Preferred Units (in shares)	40,440					40,440		40,440
Series Four Preferred Units Annual Dividend Payable Rate					2.00%	2.00%

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 150,975		$ 170,436		$ 314,632		$ 735,128
Other comprehensive income:
Amortization of interest rate contracts (1)	628	[1]	629	[1]	1,881	[1]	1,884	[1]
Other comprehensive income	628		629		1,881		1,884
Comprehensive income	151,603		171,065		316,513		737,012
Net income attributable to noncontrolling interests	(20,604)		(15,112)		(48,306)		(76,856)
Other comprehensive income attributable to noncontrolling interests	(65)		(62)		(191)		(189)
Comprehensive income attributable to Boston Properties, Inc.	$ 130,934		$ 155,891		$ 268,016		$ 659,967

[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 Nine Months Ended September 30, 2014

9 Months Ended

Sep. 30, 2014

Real Estate [Abstract]

Real Estate Activity During the Nine Months Ended September 30, 2014

3. Real Estate Activity During the Nine Months Ended September 30, 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.

On April 1, 2014, the Company commenced construction of its 99 Third Avenue development project totaling approximately 17,000 net rentable square feet of retail space located in Waltham, Massachusetts.

On April 3, 2014, the Company commenced construction of its 690 Folsom Street development project totaling approximately 26,000 net rentable square feet of office and retail space located in San Francisco, California.

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 commenced construction of the building.

On May 20, 2014, the Company commenced construction of its 888 Boylston Street development project totaling approximately 425,000 net rentable square feet of Class A office space located in Boston, Massachusetts.

On May 20, 2014, the Company commenced construction of its 10 CityPoint development project totaling approximately 245,000 net rentable square feet of Class A office space located in Waltham, Massachusetts.

On August 31, 2014, the Company completed and fully placed in-service 250 West 55th Street, a Class A office project with approximately 988,000 net rentable square feet located in New York City.

On September 17, 2014, the Company completed and fully placed in-service 680 Folsom Street, a Class A office project with approximately 525,000 net rentable square feet located in San Francisco, California.

Dispositions

On June 11, 2014, the Company entered into a contract for the sale of its Patriots Park properties located in Reston, Virginia for a sale price of $321.0 million, which exceeds the carrying value at September 30, 2014. Patriots Park consists of three Class A office properties aggregating approximately 706,000 net rentable square feet (See Note 13).

On July 29, 2014, the Company completed the sale of its Mountain View Technology Park properties and Mountain View Research Park Building Sixteen property located in Mountain View, California for an aggregate sale price of approximately $92.1 million. Net cash proceeds totaled approximately $91.2 million, resulting in a gain on sale of real estate totaling approximately $36.4 million. Mountain View Technology Park is a seven-building complex of Office/Technical properties aggregating approximately 135,000 net rentable square feet. Mountain View Research Park Building Sixteen is an Office/Technical property with approximately 63,000 net rentable square feet.

On August 20, 2014, a portion of the land parcel at the Company’s One Reston Overlook property located in Reston, Virginia was taken by eminent domain. Net cash proceeds totaled approximately $2.6 million, resulting in a gain on sale of real estate totaling approximately $1.2 million.

On August 22, 2014, the Company completed the sale of a parcel of land within its Broad Run Business Park property located in Loudoun County, Virginia for a sale price of approximately $9.8 million. Net cash proceeds totaled approximately $9.7 million, resulting in a gain on sale of real estate totaling approximately $4.3 million. The parcel is an approximately 15.5 acre land parcel subject to a ground lease that was scheduled to expire on October 31, 2048 with a tenant that exercised its purchase option under the ground lease.

On September 16, 2014, the Company entered into a binding purchase and sale agreement to sell a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston for an aggregate gross sales price of approximately $1.827 billion in cash, less the partner’s pro rata share of the indebtedness secured by 601 Lexington Avenue, subject to certain prorations and adjustments. In connection with the sale, the Company will form a joint venture for each property with the buyer and provide customary property management and leasing services to the joint ventures. 601 Lexington Avenue is a 1,669,000 square foot Class A office complex located in Midtown Manhattan. The property consists of a 59-story tower as well as a six-story low-rise office and retail building. The property is subject to existing mortgage indebtedness of approximately $712.9 million. The Atlantic Wharf Office Building is a 791,000 square foot Class A office tower located on Boston's Waterfront. 100 Federal Street is a 1,323,000 square foot Class A office tower located in Boston's Financial District. The transaction will not qualify as a sale of real estate for financial reporting purposes as the Company will continue to control the joint ventures and will therefore continue to account for the properties on a consolidated basis in its financial statements (See Note 13).

The Company did not have any dispositions during the three and nine months ended September 30, 2014 that qualified for discontinued operations presentation. The following table summarizes the income from discontinued operations for the three and nine months ended September 30, 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 sale of real estate, gain on forgiveness of debt and impairment loss:

	For the three months ended September 30,			For the nine months ended September 30,
	2013			2013
	(in thousands)
Total revenue	$	4,112		$	17,962
Expenses
Operating	1,495			6,290
Depreciation and amortization	940			3,826
Total expenses	2,435			10,116
Operating income	1,677			7,846
Other expense
Interest expense	—			360
Income from discontinued operations	$	1,677		$	7,486
Noncontrolling interest in income from discontinued operations – common units of the Operating Partnership	(167		)	(752		)
Income from discontinued operations attributable to Boston Properties, Inc.	$	1,510		$	6,734
Gain on sale of real estate from discontinued operations	$	86,448		$	86,448
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	(8,803		)	(10,698		)
Gain on forgiveness of debt and impairment loss from discontinued operations attributable to Boston Properties, Inc.	$	77,645		$	92,691

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Segment Information (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	176,788		$	243,033		$	61,691		$	96,219		$	577,731
Office/Technical	6,056			—			5,892			3,713			15,661
Residential	1,137			—			—			5,881			7,018
Hotel	11,918			—			—			—			11,918
Total	195,899			243,033			67,583			105,813			612,328
% of Grand Totals	31.99		%	39.69		%	11.04		%	17.28		%	100.00		%
Rental Expenses:
Class A Office	69,026			82,335			22,484			32,898			206,743
Office/Technical	1,901			—			1,363			1,009			4,273
Residential	509			—			—			3,654			4,163
Hotel	7,585			—			—			—			7,585
Total	79,021			82,335			23,847			37,561			222,764
% of Grand Totals	35.47		%	36.96		%	10.71		%	16.86		%	100.00		%
Net operating income	$	116,878		$	160,698		$	43,736		$	68,252		$	389,564
% of Grand Totals	30.00		%	41.25		%	11.23		%	17.52		%	100.00		%

For the three months ended September 30, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	170,415		$	214,086		$	53,841		$	96,141		$	534,483
Office/Technical	5,662			—			5,839			3,877			15,378
Residential	1,125			—			—			4,368			5,493
Hotel	10,652			—			—			—			10,652
Total	187,854			214,086			59,680			104,386			566,006
% of Grand Totals	33.19		%	37.83		%	10.54		%	18.44		%	100.00		%
Rental Expenses:
Class A Office	67,228			73,355			20,006			31,678			192,267
Office/Technical	1,763			—			1,287			1,064			4,114
Residential	466			—			—			2,441			2,907
Hotel	6,580			—			—			—			6,580
Total	76,037			73,355			21,293			35,183			205,868
% of Grand Totals	36.94		%	35.63		%	10.34		%	17.09		%	100.00		%
Net operating income	$	111,817		$	140,731		$	38,387		$	69,203		$	360,138
% of Grand Totals	31.05		%	39.08		%	10.66		%	19.21		%	100.00		%

For the nine months ended September 30, 2014:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	520,857		$	684,240		$	173,749		$	287,489		$	1,666,335
Office/Technical	17,788			—			18,451			11,044			47,283
Residential	3,389			—			—			15,609			18,998
Hotel	32,478			—			—			—			32,478
Total	574,512			684,240			192,200			314,142			1,765,094
% of Grand Totals	32.55		%	38.76		%	10.89		%	17.80		%	100.00		%
Rental Expenses:
Class A Office	206,242			231,668			63,078			98,818			599,806
Office/Technical	5,326			—			3,885			3,335			12,546
Residential	1,501			—			—			10,360			11,861
Hotel	21,697			—			—			—			21,697
Total	234,766			231,668			66,963			112,513			645,910
% of Grand Totals	36.35		%	35.86		%	10.37		%	17.42		%	100.00		%
Net operating income	$	339,746		$	452,572		$	125,237		$	201,629		$	1,119,184
% of Grand Totals	30.36		%	40.43		%	11.19		%	18.02		%	100.00		%

For the nine months ended September 30, 2013:

	Boston			New York			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	495,376		$	510,767		$	159,843		$	284,554		$	1,450,540
Office/Technical	16,853			—			11,317			11,951			40,121
Residential	3,257			—			—			13,298			16,555
Hotel	30,061			—			—			—			30,061
Total	545,547			510,767			171,160			309,803			1,537,277
% of Grand Totals	35.49		%	33.23		%	11.13		%	20.15		%	100.00		%
Rental Expenses:
Class A Office	195,206			177,800			58,036			94,145			525,187
Office/Technical	5,177			—			2,439			3,095			10,711
Residential	1,316			—			—			7,154			8,470
Hotel	20,959			—			—			—			20,959
Total	222,658			177,800			60,475			104,394			565,327
% of Grand Totals	39.38		%	31.45		%	10.70		%	18.47		%	100.00		%
Net operating income	$	322,889		$	332,967		$	110,685		$	205,409		$	971,950
% of Grand Totals	33.22		%	34.26		%	11.39		%	21.13		%	100.00		%

Schedule Of Reconciliation Of Net Operating Income To Net Income

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

	Three months ended September 30,						Nine months ended September 30,
	2014			2013			2014		2013
	(in thousands)
Net Operating Income	$	389,564		$	360,138		$	1,119,184	$	971,950
Add:
Development and management services income	6,475			5,475			18,197		22,063
Income from unconsolidated joint ventures	4,419			14,736			10,069		72,240
Gains on consolidation of joint ventures	—			(1,810		)	—		385,991
Interest and other income	3,421			3,879			6,841		6,646
Gains (losses) from investments in securities	(297		)	956			651		1,872
Gains (losses) from early extinguishments of debt	—			(30		)	—		122
Income from discontinued operations	—			1,677			—		7,486
Gain on sale of real estate from discontinued operations	—			86,448			—		86,448
Gain on forgiveness of debt from discontinued operations	—			—			—		20,182
Gains on sales of real estate	41,937			—			41,937		—
Less:
General and administrative expense	22,589			24,841			75,765		94,673
Transaction costs	1,402			766			2,500		1,744
Depreciation and amortization expense	157,245			153,253			466,143		406,162
Interest expense	113,308			122,173			337,839		325,746
Impairment loss	—			—			—		8,306
Impairment loss from discontinued operations	—			—			—		3,241
Noncontrolling interest in property partnerships	5,566			(3,279		)	17,473		(924		)
Noncontrolling interest—redeemable preferred units of the Operating Partnership	75			1,082			1,014		3,385
Noncontrolling interest—common units of the Operating Partnership	14,963			8,339			29,819		62,945
Noncontrolling interest in discontinued operations—common units of the Operating Partnership	—			8,970			—		11,450
Net income attributable to Boston Properties, Inc.	$	130,371		$	155,324		$	266,326	$	658,272

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Unsecured Exchangeable Senior Notes Unsecured Exchangeable Senior Notes (Narrative) (details) (Unsecured Debt [Member], 3.625% exchangeable senior notes [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Feb. 18, 2014
Unsecured Debt [Member] | 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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Subsequent Events

9 Months Ended

Sep. 30, 2014

Subsequent Events [Abstract]

Subsequent Events

13. Subsequent Events

On October 2, 2014, the Company completed the sale of its Patriots Park properties located in Reston, Virginia for a gross sale price of $321.0 million, which exceeded the carrying value of the properties. Patriots Park consists of three Class A office properties aggregating approximately 706,000 net rentable square feet.

On October 16, 2014, the Company's Operating Partnership released to the holders 27,773 Series Four Preferred Units that were previously subject to a security interest under a pledge agreement (See Note 8). On November 5, 2014, the Company's Operating Partnership redeemed such units for cash totaling approximately $1.4 million. An aggregate of 12,667 Series Four Preferred Units remain outstanding and subject to the security interest under the pledge agreement.

On October 22, 2014, MIT exercised its right to purchase the Company’s 415 Main Street property (formerly Seven Cambridge Center) located in Cambridge, Massachusetts on February 1, 2016 for approximately $106 million.  As part of its lease signed on July 14, 2004, MIT was granted a fixed price option to purchase the building at the beginning of the 11th lease year. 415 Main Street is an Office/Technical property with approximately 231,000 net rentable square feet occupied by the Broad Institute.  The sale is subject to the satisfaction of customary closing conditions and there can be no assurance that the sale will be consummated on the terms currently contemplated or at all.

On October 24, 2014, the Company completed the sale of a parcel of land at 130 Third Avenue in Waltham, Massachusetts that is permitted for 129,000 square feet for a sale price of approximately $14.3 million, which exceeded the carrying value of the property.

On October 24, 2014, a joint venture in which the Company has a 50% interest extended the loan collateralized by its Annapolis Junction Building Six property. At the time of the extension, the outstanding balance of the construction loan totaled approximately $13.9 million and bore interest at a variable rate equal to LIBOR plus 1.65% per annum and was scheduled to mature on November 17, 2014. The extended loan has a total commitment amount of $16.4 million, bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on November 17, 2015. Annapolis Junction Building Six is a Class A office property with approximately 119,000 net rentable square feet located in Annapolis, Maryland.

On October 30, 2014, the Company completed the sale of a 45% interest in each of 601 Lexington Avenue in New York City and Atlantic Wharf Office Building and 100 Federal Street in Boston for an aggregate gross sales price of approximately $1.827 billion in cash, less the partner’s pro rata share of the indebtedness secured by 601 Lexington Avenue, subject to certain prorations and adjustments. In connection with the sale, the Company formed a joint venture for each property with the buyer and will provide customary property management and leasing services to the joint ventures. 601 Lexington Avenue is a 1,669,000 square foot Class A office complex located in Midtown Manhattan. The property consists of a 59-story tower as well as a six-story low-rise office and retail building. The property is subject to existing mortgage indebtedness of approximately $712.9 million. The Atlantic Wharf Office Building is a 791,000 square foot Class A office tower located on Boston's Waterfront. 100 Federal Street is a 1,323,000 square foot Class A office tower located in Boston's Financial District. The transaction did not qualify as a sale of real estate for financial reporting purposes as the Company continues to control the joint ventures and will therefore continue to account for the properties on a consolidated basis in its financial statements.

On November 1, 2014, the Company partially placed in-service 535 Mission Street, a Class A office project with approximately 307,000 net rentable square feet located in San Francisco, California.

On November 3, 2014, the Company's Operating Partnership issued notices to redeem on December 15, 2014 (i) $300.0 million in aggregate principal amount of its 5.625% senior notes due 2015, which were scheduled to mature on April 15, 2015 (the “5.625% Notes”), and (ii) $250.0 million in aggregate principal amount of its 5.000% senior notes due 2015, which were scheduled to mature on June 1, 2015 (the “5.000% Notes”). The redemption price for each series of notes will equal the sum of (a) the present values as of the redemption date of the remaining scheduled payments of principal and interest from the redemption date to maturity (excluding any accrued and unpaid interest) discounted on a semi-annual basis at a rate equal to the yield to maturity of a comparable United States Treasury security plus (i) in the case of the 5.625% Notes, 0.35%, or (ii) in the case of the 5.000% Notes, 0.25%, plus (b) accrued interest to, but excluding, December 15, 2014, as provided in the applicable indenture. The redemption price for each series of notes will be calculated three business days prior to the redemption date and will be payable on December 15, 2014 in accordance with the terms of the applicable indentures.

On November 6, 2014, the Company entered into an option agreement pursuant to which the Company has been granted an option to purchase real property located at 425 Fourth Street in San Francisco, California.  In connection with the execution of the agreement, the Company paid a non-refundable option payment to the current owner of $1.0 million.   The Company intends to pursue the entitlements necessary to develop the property.  The purchase price has not been determined and is dependent on the entitlements obtained.   There can be no assurance that the Company will be successful in obtaining the desired entitlements or that it will ultimately determine to exercise the option.