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 June 30, 2012

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

For the transition period from            to            

Commission File Number: 1-13087

BOSTON PROPERTIES, INC.

(Exact name of Registrant as specified in its charter)

Delaware	04-2473675
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

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

(Address of principal executive offices) (Zip Code)

(617) 236-3300

(Registrant’s telephone number, including area code)

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

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

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

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

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

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

Common Stock, par value $.01 per share	150,762,982
(Class)	(Outstanding on August 2, 2012)

BOSTON PROPERTIES, INC.

FORM 10-Q

for the quarter ended June 30, 2012

TABLE OF CONTENTS

		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements (unaudited)		1
	a) Consolidated Balance Sheets as of June 30, 2012 and December 31, 2011		1
	b) Consolidated Statements of Operations for the three and six months ended June 30, 2012 and 2011		2
	c) Consolidated Statements of Comprehensive Income for the three and six months ended June  30, 2012 and 2011		3
	d) Consolidated Statements of Stockholders’ Equity for the six months ended June  30, 2012 and 2011		4
	e) Consolidated Statements of Cash Flows for the six months ended June 30, 2012 and 2011		5
	f) Notes to the Consolidated Financial Statements		7
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		30
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk		72
ITEM 4.	Controls and Procedures		73
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings		74
ITEM 1A.	Risk Factors		74
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds		74
ITEM 3.	Defaults Upon Senior Securities		74
ITEM 4.	Mine Safety Disclosures		74
ITEM 5.	Other Information		74
ITEM 6.	Exhibits		75
SIGNATURES			76

PART 1. FINANCIAL INFORMATION

ITEM 1—Financial Statements.

BOSTON PROPERTIES, INC.

CONSOLIDATED BALANCE SHEETS

(Unaudited)

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

	June 30, 2012			December 31, 2011
ASSETS
Real estate, at cost	$	13,143,487		$	12,303,965
Construction in progress		732,734			818,685
Land held for future development		270,169			266,822
Less: accumulated depreciation		(2,781,218	)		(2,642,986	)
Total real estate		11,365,172			10,746,486
Cash and cash equivalents		1,671,997			1,823,208
Cash held in escrows		31,381			40,332
Investments in securities		11,036			9,548
Tenant and other receivables (net of allowance for doubtful accounts of $1,834 and $1,766, respectively)		43,507			79,838
Related party notes receivable		282,416			280,442
Interest receivable from related party notes receivable		98,866			89,854
Accrued rental income (net of allowance of $2,693 and $2,515, respectively)		559,646			522,675
Deferred charges, net		504,475			445,403
Prepaid expenses and other assets		41,480			75,458
Investments in unconsolidated joint ventures		670,653			669,722
Total assets	$	15,280,629		$	14,782,966
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable	$	2,877,125		$	3,123,267
Unsecured senior notes (net of discount of $11,587 and $9,814, respectively)		4,863,413			3,865,186
Unsecured exchangeable senior notes (net of discount of $2,368 and $3,462, respectively)		1,155,669			1,715,685
Unsecured line of credit		—			—
Accounts payable and accrued expenses		163,496			155,139
Dividends and distributions payable		93,353			91,901
Accrued interest payable		61,947			69,105
Other liabilities		308,354			293,515
Total liabilities		9,523,357			9,313,798
Commitments and contingencies		—			—
Noncontrolling interest:
Redeemable preferred units of the Operating Partnership		51,537			55,652
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, none issued or outstanding		—			—
Common stock, $.01 par value, 250,000,000 shares authorized, 150,794,602 and 148,186,511 issued and 150,715,702 and 148,107,611 outstanding at June 30, 2012 and December 31, 2011, respectively		1,507			1,481
Additional paid-in capital		5,184,710			4,936,457
Dividends in excess of earnings		(34,463	)		(53,080	)
Treasury common stock at cost, 78,900 shares at June 30, 2012 and December 31, 2011		(2,722	)		(2,722	)
Accumulated other comprehensive loss		(14,978	)		(16,138	)
Total stockholders’ equity attributable to Boston Properties, Inc.		5,134,054			4,865,998
Noncontrolling interests:
Common units of the Operating Partnership		573,241			548,581
Property partnerships		(1,560	)		(1,063	)
Total equity		5,705,735			5,413,516
Total liabilities and equity	$	15,280,629		$	14,782,966

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

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BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
	2012			2011			2012			2011
	(in thousands, except for per share amounts)
Revenue
Rental
Base rent	$	372,285		$	346,515		$	728,376		$	684,122
Recoveries from tenants		57,475			48,255			109,222			93,495
Parking and other		23,524			21,098			45,951			40,159
Total rental revenue		453,284			415,868			883,549			817,776
Hotel revenue		10,049			8,904			16,865			14,852
Development and management services		9,564			9,095			17,710			16,521
Total revenue		472,897			433,867			918,124			849,149
Expenses
Operating
Rental		161,853			143,633			318,299			282,524
Hotel		6,616			6,281			12,715			12,020
General and administrative		19,066			18,721			46,685			43,364
Transaction costs		8			1,361			2,112			1,433
Depreciation and amortization		111,643			110,259			220,583			218,852
Total expenses		299,186			280,255			600,394			558,193
Operating income		173,711			153,612			317,730			290,956
Other income (expense)
Income from unconsolidated joint ventures		21,191			8,882			32,912			16,858
Interest and other income		2,382			1,953			4,028			2,927
Gains (losses) from investments in securities		(186	)		6			615			379
Gains from early extinguishments of debt		274			—			1,041			—
Interest expense		(99,901	)		(94,583	)		(203,138	)		(193,108	)
Income from continuing operations		97,471			69,870			153,188			118,012
Discontinued operations
Income (loss) from discontinued operations		398			(132	)		884			(80	)
Gain on sale of real estate from discontinued operations		36,877			—			36,877			—
Gain on forgiveness of debt from discontinued operations		—			—			17,807			—
Net income		134,746			69,738			208,756			117,932
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnership		(457	)		(503	)		(1,003	)		(1,032	)
Noncontrolling interest—redeemable preferred units of the Operating Partnership		(765	)		(842	)		(1,566	)		(1,665	)
Noncontrolling interest—common units of the Operating Partnership		(10,360	)		(8,194	)		(16,400	)		(14,296	)
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		(4,094	)		15			(6,115	)		10
Net income attributable to Boston Properties, Inc.	$	119,070		$	60,214		$	183,672		$	100,949
Basic earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations	$	0.57		$	0.41		$	0.90		$	0.70
Discontinued operations		0.22			—			0.33			—
Net income	$	0.79		$	0.41		$	1.23		$	0.70
Weighted average number of common shares outstanding		150,312			145,864			149,328			143,990
Diluted earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations	$	0.57		$	0.41		$	0.90		$	0.70
Discontinued operations		0.22			—			0.33			—
Net income	$	0.79		$	0.41		$	1.23		$	0.70
Weighted average number of common and common equivalent shares outstanding		150,694			146,695			149,720			144,610

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

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BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three months ended June  30,						Six months ended June  30,
	2012			2011			2012			2011
	(in thousands)
Net income	$	134,746		$	69,738		$	208,756		$	117,932
Other comprehensive income:
Amortization of interest rate contracts		648			648			1,297			1,297
Other comprehensive income		648			648			1,297			1,297
Comprehensive income		135,394			70,386			210,053			119,229
Net income attributable to noncontrolling interests		(15,676	)		(9,524	)		(25,084	)		(16,983	)
Other comprehensive income attributable to noncontrolling interests		(68	)		(75	)		(137	)		(155	)
Comprehensive income attributable to Boston Properties, Inc.	$	119,650		$	60,787		$	184,832		$	102,091

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

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BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited and in thousands)

	Common 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, 2011		148,108	$	1,481	$	4,936,457		$	(53,080	)	$	(2,722	)	$	(16,138	)	$	547,518		$	5,413,516
Conversion of operating partnership units to Common Stock		227		2		6,829			—			—			—			(6,831	)		—
Conversion of redeemable preferred units to common units		—		—		—			—			—			—			4,115			4,115
Allocated net income for the year		—		—		—			183,672			—			—			23,518			207,190
Dividends/distributions declared		—		—		—			(165,055	)		—			—			(20,100	)		(185,155	)
Sale of common stock, net of offering costs		2,348		24		247,162			—			—			—			—			247,186
Shares issued pursuant to stock purchase plan		4		—		381			—			—			—			—			381
Net activity from stock option and incentive plan		29		—		4,032			—			—			—			14,673			18,705
Distributions to noncontrolling interests in property partnerships		—		—		—			—			—			—			(1,500	)		(1,500	)
Amortization of interest rate contracts		—		—		—			—			—			1,160			137			1,297
Reallocation of noncontrolling interest		—		—		(10,151	)		—			—			—			10,151			—
Equity, June 30, 2012		150,716	$	1,507	$	5,184,710		$	(34,463	)	$	(2,722	)	$	(14,978	)	$	571,681		$	5,705,735
Equity, December 31, 2010		140,199	$	1,402	$	4,417,162		$	(24,763	)	$	(2,722	)	$	(18,436	)	$	591,550		$	4,964,193
Conversion of operating partnership units to Common Stock		1,650		17		47,534			—			—			—			(47,551	)		—
Allocated net income for the year		—		—		—			100,949			—			—			15,318			116,267
Dividends/distributions declared		—		—		—			(145,723	)		—			—			(19,780	)		(165,503	)
Sale of common stock, net of offering costs		4,229		42		394,675			—			—			—			—			394,717
Shares issued pursuant to stock purchase plan		4		—		312			—			—			—			—			312
Net activity from stock option and incentive plan		305		3		12,950			—			—			—			13,307			26,260
Distributions to noncontrolling interests in property partnerships		—		—		—			—			—			—			(1,000	)		(1,000	)
Amortization of interest rate contracts		—		—		—			—			—			1,142			155			1,297
Reallocation of noncontrolling interest		—		—		(26,630	)		—			—			—			26,630			—
Equity, June 30, 2011		146,387	$	1,464	$	4,846,003		$	(69,537	)	$	(2,722	)	$	(17,294	)	$	578,629		$	5,336,543

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

4

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the six months ended June 30,
	2012			2011
	(in thousands)
Cash flows from operating activities:
Net income	$	208,756		$	117,932
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		221,623			220,508
Non-cash compensation expense		18,113			17,765
Income from unconsolidated joint ventures		(32,912	)		(16,858	)
Distributions of net cash flow from operations of unconsolidated joint ventures		20,190			17,442
Gains from investments in securities		(615	)		(379	)
Non-cash portion of interest expense		21,881			27,014
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes		(68,760	)		—
Gains from early extinguishments of debt		(1,196	)		—
Gain on sale of real estate from discontinued operations		(36,877	)		—
Gain on forgiveness of debt from discontinued operations		(17,807	)		—
Change in assets and liabilities:
Cash held in escrows		8,675			(4,408	)
Tenant and other receivables, net		30,120			16,346
Accrued rental income, net		(39,598	)		(49,195	)
Prepaid expenses and other assets		38,618			(6,505	)
Accounts payable and accrued expenses		(2,710	)		169
Accrued interest payable		(4,977	)		(281	)
Other liabilities		(7,589	)		(28,517	)
Tenant leasing costs		(23,855	)		(20,932	)
Total adjustments		122,324			172,169
Net cash provided by operating activities		331,080			290,101
Cash flows from investing activities:
Acquisitions of real estate		(621,359	)		(41,100	)
Construction in progress		(152,548	)		(137,258	)
Building and other capital improvements		(21,569	)		(13,390	)
Tenant improvements		(72,786	)		(28,290	)
Proceeds from the sale of real estate		61,963			—
Proceeds from land transaction		—			43,887
Deposit on real estate released from escrow		—			10,000
Issuance of notes receivable		(1,974	)		(6,375	)
Capital contributions to unconsolidated joint ventures		(325	)		(16,716	)
Capital distributions from unconsolidated joint ventures		3,057			—
Investments in securities, net		(873	)		(864	)
Net cash used in investing activities		(806,414	)		(190,106	)

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

5

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the six months ended June 30,
	2012			2011
	(in thousands)
Cash flows from financing activities:
Proceeds from mortgage notes payable		—			453,306
Repayments of mortgage notes payable		(219,865	)		(468,639	)
Proceeds from unsecured senior notes		997,790			—
Redemption/repurchase of unsecured exchangeable senior notes		(507,434	)		—
Deposit on mortgage loan financing		—			(14,500	)
Deferred financing costs		(7,758	)		(6,220	)
Net proceeds from ATM stock issuances		247,186			394,717
Net proceeds from equity transactions		973			8,807
Dividends and distributions		(185,269	)		(164,830	)
Distributions to noncontrolling interest in property partnership		(1,500	)		(1,000	)
Net cash provided by financing activities		324,123			201,641
Net increase (decrease) in cash and cash equivalents		(151,211	)		301,636
Cash and cash equivalents, beginning of period		1,823,208			478,948
Cash and cash equivalents, end of period	$	1,671,997		$	780,584
Supplemental disclosures:
Cash paid for interest	$	276,494		$	190,851
Interest capitalized	$	21,278		$	23,197
Non-cash investing and financing activities:
Additions to real estate included in accounts payable	$	3,225		$	19,154
Mortgage note payable assumed in connection with the acquisition of real estate	$	—		$	143,900
Mortgage note payable extinguished through foreclosure	$	25,000		$	—
Real estate transferred upon foreclosure	$	8,198		$	—
Dividends and distributions declared but not paid	$	93,353		$	83,369
Conversions of noncontrolling interests to stockholders’ equity	$	6,831		$	47,551
Conversion of redeemable preferred units to common units	$	4,115		$	—
Issuance of restricted securities to employees and directors	$	25,955		$	25,087

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 June 30, 2012 owned an approximate 88.5% (87.5% at June 30, 2011) 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 2008, February 2011 and February 2012, the Company issued LTIP Units in connection with the granting to employees of outperformance awards (also referred to as “2008 OPP Units,” “2011 OPP Units” and “2012 OPP Units,” respectively, and collectively as “OPP Units”). Because the rights, preferences and privileges of OPP 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. On February 5, 2011, the measurement period for the Company’s 2008 OPP Unit awards expired and the Company’s total return to shareholders was not sufficient for employees to earn and therefore become eligible to vest in any of the 2008 OPP Unit awards. Accordingly, all 2008 OPP Unit awards were automatically forfeited (See Notes 9 and 12).

Unless specifically noted otherwise, all references to OP Units exclude units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership is obligated to redeem such OP Unit for cash equal to the value of a share of common stock of the Company (“Common Stock”) at such time. In lieu of a cash redemption, the Company may elect to acquire such OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that the Company owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock. An LTIP Unit is generally the economic equivalent of a share of restricted common stock of the Company. LTIP Units, whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Note 12).

At June 30, 2012, there was one series of Preferred Units outstanding (i.e., Series Two Preferred Units). The Series Two Preferred Units bear a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be converted into OP Units or redeemed for cash at the election of the holder thereof or the Operating Partnership in accordance with the terms and conditions set forth in the applicable amendment to the partnership agreement (See Note 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 June 30, 2012, the Company owned or had interests in a portfolio of 150 commercial real estate properties (the “Properties”) aggregating approximately 42.8 million net rentable square feet, including six properties under construction totaling approximately 2.2 million net rentable square feet. In addition, the Company has structured parking for approximately 44,703 vehicles containing approximately 15.2 million square feet. At June 30, 2012, the Properties consist of:

• 143 office properties, including 126 Class A office properties (including five properties under construction) and 17 Office/Technical properties;

7

• one hotel;

• three retail properties; and

• three residential properties (including one property under construction).

The Company owns or controls undeveloped land parcels totaling approximately 510.5 acres. In addition, the Company has a noncontrolling interest in the Boston Properties Office Value-Added Fund, L.P. (the “Value-Added Fund”), which is a strategic partnership with two institutional investors through which the Company has pursued the acquisition of value-added investments in assets within its existing markets. The Company’s investments through the Value-Added Fund are not included in its portfolio information or any other portfolio level statistics. At June 30, 2012, the Value-Added Fund had investments in 24 buildings comprised of an office property in Chelmsford, Massachusetts and office complexes in Mountain View, California.

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., executes all significant business relationships. All majority-owned subsidiaries and affiliates 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, 2011. Certain prior year amounts have been reclassified to conform to the current year presentation.

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 fair value of the Company’s unsecured senior notes and unsecured exchangeable senior notes is categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company uses quoted market rates to value these instruments. However, the fair value could be categorized at a level 2 basis if trading volumes

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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 fair value of the Company’s mortgage notes payable is 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 June 30, 2012 and December 31, 2011 (in thousands):

	June 30, 2012					December 31, 2011
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	2,877,125		$	2,985,393	$	3,123,267		$	3,297,903
Unsecured senior notes		4,863,413			5,236,475		3,865,186			4,148,461
Unsecured exchangeable senior notes		1,155,669	(1)		1,328,569		1,715,685	(1)		1,904,115
Total	$	8,896,207		$	9,550,437	$	8,704,138		$	9,350,479

(1) Includes the net impact of Accounting Standards Codification (“ASC”) ASC 470-20 totaling approximately $39.5 million and $54.5 million at June 30, 2012 and December 31, 2011, respectively.

Out-of-Period Adjustment

During the six months ended June 30, 2012, the Company recorded additional real estate operating expenses totaling approximately $3.2 million related to the cumulative non-cash straight-line adjustment to the ground rent expense of certain ground leases that were not previously recognized on a straight-line basis. This resulted in the overstatement of real estate operating expenses by approximately $3.2 million during the six months ended June 30, 2012 and in the understatement of real estate operating expenses in the aggregate amount of approximately $3.2 million in previous periods. Because this adjustment was not material to the prior years’ consolidated financial statements and the impact of recording the adjustment in the current period is not material to the Company’s consolidated financial statements, the Company recorded the related adjustment during the six months ended June 30, 2012.

3. Real Estate Activity During the Six Months Ended June 30, 2012

Acquisitions

On March 1, 2012, the Company acquired 453 Ravendale Drive located in Mountain View, California for a purchase price of approximately $6.7 million in cash. 453 Ravendale Drive is an approximately 30,000 net rentable square foot Office/Technical property. The following table summarizes the allocation of the aggregate purchase price of 453 Ravendale Drive at the date of acquisition (in thousands).

Land	$	5,477
Building and improvements		974
Tenant improvements		116
In-place lease intangibles		223
Below-market rents		(140	)
Net assets acquired	$	6,650

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On March 13, 2012, the Company acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash. In connection with the transaction, the Company entered into a long-term lease with an affiliate of Bank of America for approximately 735,000 square feet. 100 Federal Street is an approximately 1,264,000 net rentable square foot, 37-story Class A office tower located in Boston, Massachusetts. The following table summarizes the allocation of the aggregate purchase price of 100 Federal Street at the date of acquisition (in thousands).

Land	$	131,067
Building and improvements		387,321
Tenant improvements		48,633
In-place lease intangibles		69,530
Above-market rents		81
Other assets		4,800
Below-market rents		(22,515	)
Accounts payable and accrued expenses		(3,917	)
Net assets acquired	$	615,000

The following table summarizes the estimated amortization of the acquired in-place lease intangibles and the acquired net below-market lease intangibles for 453 Ravendale Drive and 100 Federal Street, collectively, for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles		Acquired Net  Below- Market Lease Intangibles
Period from July 1, 2012 through December 31, 2012	$	5,080	$	1,864
2013		10,084		3,709
2014		7,869		3,374
2015		5,927		2,885
2016		5,199		2,512

100 Federal Street contributed approximately $19.5 million of revenue and approximately $3.3 million of earnings to the Company for the period from March 13, 2012 through June 30, 2012. 453 Ravendale Drive contributed approximately $0.2 million of revenue and approximately $40,000 of earnings to the Company for the period from March 1, 2012 through June 30, 2012.

The accompanying pro forma information for the six months ended June 30, 2012 and 2011 is presented as if the acquisitions of (1) 453 Ravendale Drive on March 1, 2012 and (2) 100 Federal Street on March 13, 2012, had occurred on January 1, 2011. This pro forma information is based upon the historical consolidated financial statements and should be read in conjunction with the consolidated financial statements and notes thereto. This pro forma information does not purport to represent what the actual results of operations of the Company would have been had the above occurred, nor do they purport to predict the results of operations of future periods.

Pro Forma	Six months ended June 30,
(in thousands, except per share data)	2012		2011
Total revenue	$	932,251	$	882,090
Income from continuing operations	$	155,514	$	122,989
Net income attributable to Boston Properties, Inc.	$	185,751	$	105,242
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	1.24	$	0.73
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	1.24	$	0.73

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Developments

On January 3, 2012, the Company commenced the redevelopment of Two Patriots Park, a Class A office project with approximately 256,000 net rentable square feet located in Reston, Virginia. The Company will capitalize incremental costs during the redevelopment.

On April 30, 2012, the Company fully placed in-service 510 Madison Avenue, a Class A office project with approximately 356,000 net rentable square feet located in New York City.

On May 4, 2012, the Company completed and fully placed in-service One Patriots Park, a Class A office redevelopment project with approximately 268,000 net rentable square feet located in Reston, Virginia.

Dispositions

On January 31, 2012, the servicer of the non-recourse mortgage loan collateralized by the Company’s Montvale Center property located in Gaithersburg, Maryland foreclosed on the property. During 2011, the Company had notified the master servicer of the non-recourse mortgage loan that the cash flows generated from the property were insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and that the Company was not prepared to fund any cash shortfalls. The Company was not current on making debt service payments and was accruing interest at the default interest rate of 9.93% per annum. The loan was originally scheduled to mature on June 6, 2012. As a result of the foreclosure, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate and working capital to the servicer. The Company no longer has any equitable or economic ownership interest in the property. The transaction resulted in a gain on forgiveness of debt of approximately $17.8 million. The operating results of the property through the date of foreclosure have been classified as discontinued operations on a historical basis for all periods presented.

On May 17, 2012, the Company completed the sale of its Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash. Net cash proceeds totaled approximately $62.0 million, resulting in a gain on sale of approximately $36.9 million. Bedford Business Park is comprised of two Office/Technical buildings and one Class A office building aggregating approximately 470,000 net rentable square feet.

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The following table summarizes the income (loss) from discontinued operations related to Montvale Center and Bedford Business Park and the related gain on sale of real estate and gain on forgiveness of debt for the three and six months ended June 30, 2012 and 2011:

	For the three months ended June 30,						For the six months ended June 30,
	2012			2011			2012			2011
	(in thousands)
Total revenue	$	1,091		$	2,584		$	3,748		$	5,177
Expenses
Operating		450			1,242			1,602			2,322
Depreciation and amortization		243			821			1,040			1,656
Total expenses		693			2,063			2,642			3,978
Operating income		398			521			1,106			1,199
Other expense
Interest expense		—			(653	)		(222	)		(1,279	)
Income (loss) from discontinued operations	$	398		$	(132	)	$	884		$	(80	)
Noncontrolling interest in income (loss) from discontinued operations – common units of the Operating Partnership		(42	)		15			(94	)		10
Income (loss) from discontinued operations attributable to Boston Properties, Inc.	$	356		$	(117	)	$	790		$	(70	)
Gain on sale of real estate from discontinued operations	$	36,877		$	—		$	36,877		$	—
Gain on forgiveness of debt from discontinued operations		—			—			17,807			—
Noncontrolling interest in gain on sale of real estate and gain on forgiveness of debt from discontinued operations – common units of the Operating Partnership		(4,052	)		—			(6,021	)		—
Gain on sale of real estate and gain on forgiveness of debt from discontinued operations attributable to Boston Properties, Inc.	$	32,825		$	—		$	48,663		$	—

4. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at June 30, 2012:

Entity	Properties	Nominal % Ownership
Square 407 Limited Partnership	Market Square North		50.0	%
The Metropolitan Square Associates LLC	Metropolitan Square		51.0	%
BP/CRF 901 New York Avenue LLC	901 New York Avenue		25.0	%(1)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure		33.3	%(2)
RBP Joint Venture LLC	Eighth Avenue and 46th Street		50.0	%(3)
Boston Properties Office Value-Added Fund, L.P.	300 Billerica Road and Mountain View Research and Technology Parks		37.6	%(1)(4)
Annapolis Junction NFM, LLC	Annapolis Junction		50.0	%(5)
767 Venture, LLC	The General Motors Building		60.0	%
2 GCT Venture LLC	Two Grand Central Tower		60.0	%(6)
540 Madison Venture LLC	540 Madison Avenue		60.0	%
125 West 55th Street Venture LLC	125 West 55th Street		60.0	%
500 North Capitol LLC	500 North Capitol Street, NW		30.0	%(7)

(1) The Company’s economic ownership can increase based on the achievement of certain return thresholds.

(2) The Company’s wholly-owned entity that owns the office component of the project owns a 33.3% interest in the entity owning the land and infrastructure of the project.

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(3) This property is not in operation and consists of assembled land.

(4) Represents the Company’s effective ownership interest. The Company has a 25.0% interest in the 300 Billerica Road property and a 39.5% interest in the Mountain View Research and Technology Park properties.

(5) Comprised of one building, one building under construction and two undeveloped land parcels.

(6) The property was sold on October 25, 2011. As of June 30, 2012, the investment is comprised of working capital and a portion of the sale proceeds.

(7) This property is under construction.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures at an agreed upon fair value. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

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

	June 30, 2012			December 31, 2011
	(in thousands)
ASSETS
Real estate and development in process, net	$	4,519,909		$	4,542,594
Other assets		675,191			668,113
Total assets	$	5,195,100		$	5,210,707
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	3,018,423		$	2,988,894
Other liabilities		822,672			854,257
Members’/Partners’ equity		1,354,005			1,367,556
Total liabilities and members’/partners’ equity	$	5,195,100		$	5,210,707
Company’s share of equity	$	799,513		$	799,479
Basis differentials(1)		(128,860	)		(129,757	)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	670,653		$	669,722

(1) This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.

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The combined summarized statements of operations of the joint ventures are as follows:

	For the three months ended June 30,					For the six months  ended June 30,
	2012		2011			2012		2011
	(in thousands)
Total revenue(1)	$	156,035	$	144,987		$	295,135	$	290,632
Expenses
Operating		39,261		42,272			78,153		85,114
Depreciation and amortization		42,679		48,243			84,578		98,880
Total expenses		81,940		90,515			162,731		183,994
Operating income		74,095		54,472			132,404		106,638
Other expense
Interest expense		55,909		57,007			111,271		114,768
Net income (loss)	$	18,186	$	(2,535	)	$	21,133	$	(8,130	)
Company’s share of net income (loss)	$	10,641	$	(2,284	)	$	12,012	$	(5,339	)
Basis differential		431		1,759			897		3,515
Elimination of inter-entity interest on partner loan		10,119		9,407			20,003		18,682
Income from unconsolidated joint ventures	$	21,191	$	8,882		$	32,912	$	16,858

(1) Includes straight-line rent adjustments of $2.8 million and $4.0 million for the three months ended June 30, 2012 and 2011, respectively, and $7.1 million and $8.1 million for the six months ended June 30, 2012 and 2011, respectively. Includes net below-market rent adjustments of $23.2 million and $29.2 million for the three months ended June 30, 2012 and 2011, respectively, and $48.5 million and $58.7 million for the six months ended June 30, 2012 and 2011, respectively. Total revenue for the three and six months ended June 30, 2012 includes termination income totaling approximately $19.6 million (of which the Company’s share is approximately $11.8 million) related to a lease termination with a tenant at the General Motors Building.

5. Mortgage Notes Payable

On January 31, 2012, the servicer of the non-recourse mortgage loan collateralized by the Company’s Montvale Center property located in Gaithersburg, Maryland foreclosed on the property. During 2011, the Company had notified the master servicer of the non-recourse mortgage loan that the cash flows generated from the property were insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and that the Company was not prepared to fund any cash shortfalls. The Company was not current on making debt service payments and was accruing interest at the default interest rate of 9.93% per annum. The loan was originally scheduled to mature on June 6, 2012. As a result of the foreclosure, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate and working capital to the servicer. The Company no longer has any equitable or economic ownership interest in the property. The transaction resulted in a gain on forgiveness of debt of approximately $17.8 million. The operating results of the property through the date of foreclosure have been classified as discontinued operations on a historical basis for all periods presented (See Note 3).

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

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

6. Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Principal Amount			Maturity Date(2)
10 Year Unsecured Senior Notes		6.250	%		6.381	%	$	182,432		January 15, 2013(3)
10 Year Unsecured Senior Notes		6.250	%		6.291	%		42,568		January 15, 2013(3)
12 Year Unsecured Senior Notes		5.625	%		5.693	%		300,000		April 15, 2015
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000		June 1, 2015
10 Year Unsecured Senior Notes		5.875	%		5.967	%		700,000		October 15, 2019
10 Year Unsecured Senior Notes		5.625	%		5.708	%		700,000		November 15, 2020
10 Year Unsecured Senior Notes		4.125	%		4.289	%		850,000		May 15, 2021
7 Year Unsecured Senior Notes		3.700	%		3.853	%		850,000		November 15, 2018
11 Year Unsecured Senior Notes		3.850	%		3.954	%		1,000,000		February 1, 2023
Total principal								4,875,000
Net unamortized discount								(11,587	)
Total							$	4,863,413

(1) Yield on issuance date including the effects of discounts on the notes.

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

(3) On July 25, 2012, the Company’s Operating Partnership issued notice to redeem these notes on August 24, 2012 (See Note 14).

On June 11, 2012, the Company’s Operating Partnership completed a public offering of $1.0 billion in aggregate principal amount of its 3.850% senior unsecured notes due 2023. The notes were priced at 99.779% of the principal amount to yield an effective rate (including financing fees) of 3.954% to maturity. The notes will mature on February 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $989.4 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At June 30, 2012, the Company was in compliance with each of these financial restrictions and requirements.

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7. Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Exchange Rate			Principal Amount			First Optional Redemption Date by the Company			Maturity Date
3.625% Exchangeable Senior Notes		3.625	%		4.037	%		8.5051	(2)	$	747,500			N/A		February 15, 2014
3.750% Exchangeable Senior Notes		3.750	%		3.787	%		10.0066	(3)		450,000			May 18, 2013	(4)	May 15, 2036
Total principal											1,197,500
Net unamortized discount											(2,368	)
Adjustment for the equity component allocation, net of accumulated amortization											(39,463	)
Total										$	1,155,669

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

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustment), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. As of June 30, 2012, the effective exchange price was $134.94 per share.

(3) In connection with the special distribution of $5.98 per share of Boston Properties, Inc.’s common stock declared on December 17, 2007, the exchange rate was adjusted from 9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately$99.93 per share of Boston Properties, Inc.’s common stock.

(4) Holders may require the Operating Partnership to repurchase the notes for cash on May 18, 2013 and on May 15 of 2016, 2021, 2026 and 2031 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to 100% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date.

On January 10, 2012, the Company announced that holders of the 2.875% Exchangeable Senior Notes due 2037 (the “Notes”) issued by its Operating Partnership had the right to surrender their Notes for purchase by the Operating Partnership (the “Put Right”) on February 15, 2012. The opportunity to exercise the Put Right expired at 5:00 p.m., New York City time, on February 8, 2012. On January 10, 2012, the Company also announced that the Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on February 20, 2012 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the redemption, holders of the Notes had the right to exchange their Notes prior to 5:00 p.m., New York City time, on February 16, 2012. Notes with respect to which the Put Right was not exercised (or with respect to which the Put Right was exercised and subsequently withdrawn prior to the withdrawal deadline) and that were not surrendered for exchange prior to 5:00 p.m., New York City time, on February 16, 2012, were redeemed by the

16

Operating Partnership on the Redemption Date 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. Holders of an aggregate of $242,735,000 of the Notes exercised the Put Right and the Operating Partnership repurchased such Notes on February 15, 2012. On February 20, 2012, the Operating Partnership redeemed the remaining $333,459,000 of outstanding Notes at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon.

8. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence.

The Company has letter of credit and performance obligations of approximately $16.4 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. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

In connection with the assumption of the General Motors Building’s secured loan by the Company’s unconsolidated joint venture, 767 Venture, LLC, the Company guaranteed the unconsolidated joint venture’s obligation to fund various escrows, including tenant improvements, taxes and insurance in lieu of cash deposits. As of June 30, 2012, the maximum funding obligation under the guarantee was approximately $20.2 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.

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.

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”). Currently, the Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism certified under TRIA other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billion of coverage in the Company’s property insurance program which is provided by IXP, LLC (“IXP”) as a direct insurer. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage, with $1.375 billion of Terrorism Coverage in excess of $250 million being provided by

NYXP, LLC (“NYXP”), as a direct insurer. The Company also currently carries nuclear, biological, chemical

17

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 the properties owned by the Company’s Value-Added Fund and certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the additional Terrorism Coverage provided by IXP for 601 Lexington Avenue, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $100.0 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that the Company believes are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically, the Company currently carries earthquake insurance which covers its San Francisco region 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 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 on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.

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

The mortgages on the Company’s properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identity of the insurance companies in the Company’s insurance programs. The ratings of some of the Company’s insurers are below the rating requirements in some of the Company’s loan agreements and the lenders for these loans could attempt to claim an event of default has occurred under the loan. The Company

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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 or the presence of mold at the Company’s properties, 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.

9. Noncontrolling Interests

Noncontrolling interests relate to the interests in the Operating Partnership not owned by the Company and interests in property partnerships not wholly-owned by the Company. As of June 30, 2012, the noncontrolling interests consisted of 16,514,469 OP Units, 1,683,214 LTIP Units, 400,000 2011 OPP Units, 400,000 2012 OPP Units and 1,030,748 Series Two Preferred Units (or 1,352,688 OP Units on an as converted basis) held by parties other than the Company.

Noncontrolling Interest—Redeemable Preferred Units of the Operating Partnership

The Preferred Units at June 30, 2012 consisted solely of 1,030,748 Series Two Preferred Units, which bear a preferred distribution equal to the greater of (1) the distribution which would have been paid in respect of the Series Two Preferred Unit had such Series Two Preferred Unit been converted into an OP Unit (including both regular and special distributions) or (2) 6.00% per annum on a liquidation preference of $50.00 per unit, and are convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). The holders of Series Two Preferred Units have the right to require the Operating Partnership to redeem their units for cash at the redemption price of $50.00 per unit on May 14, 2013 and May 12, 2014. The maximum number of units that may be required to be redeemed from all holders on each of these dates is 1,007,662, which is one-sixth of the number of Series Two Preferred Units that were originally issued. The holders also had the right to have their Series Two Preferred Units redeemed for cash on May 12, 2009, May 12, 2010, May 12, 2011 and May 14, 2012, although no holder exercised such right. The Company also has the right, subject to certain conditions, to redeem Series Two Preferred Units for cash or to convert into OP Units any Series Two Preferred Units that are not redeemed when they are eligible for redemption.

On February 5, 2012, 82,296 Series Two Preferred Units of the Operating Partnership were converted by the holders into 108,000 OP Units. In addition, the Company paid the accrued preferred distributions due to the holders of Preferred Units that were converted.

On February 15, 2012, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.75616 per unit. On May 15, 2012, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.73151 per unit.

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The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the six months ended June 30, 2012 and 2011 (in thousands):

Balance at January 1, 2012	$	55,652
Net income		1,566
Distributions		(1,566	)
Conversion of redeemable preferred units to common units		(4,115	)
Balance at June 30, 2012	$	51,537
Balance at January 1, 2011	$	55,652
Net income		1,665
Distributions		(1,665	)
Balance at June 30, 2011	$	55,652

Noncontrolling Interest—Common Units of the Operating Partnership

During the six months ended June 30, 2012, 225,835 OP Units were presented by the holders for redemption (including 108,000 OP Units issued upon conversion of Series Two Preferred Units and 67,256 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 June 30, 2012, the Company had outstanding 400,000 2011 OPP Units and 400,000 2012 OPP Units (See Note 12). Prior to the measurement date (January 31, 2014 for 2011 OPP Units and February 6, 2015 for 2012 OPP Units), holders of OPP 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, both vested and unvested, that OPP award recipients have earned, if any, based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit.

On January 27, 2012, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.55 per unit, and a distribution on the 2011 OPP Units in the amount of $0.055 per unit, to holders of record as of the close of business on December 31, 2011. On April 30, 2012, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.55 per unit, and a distribution on the 2011 OPP Units and 2012 OPP Units in the amount of $0.055 per unit, to holders of record as of the close of business on March 30, 2012. On June 15, 2012, Boston Properties, Inc., as general partner of the Operating Partnership, declared a distribution on the OP Units and LTIP Units in the amount of $0.55 per unit and a distribution on the 2011 OPP Units and 2012 OPP Units in the amount of $0.055 per unit, in each case payable on July 31, 2012 to holders of record as of the close of business on June 29, 2012.

The Series Two Preferred Units may be converted into OP Units at the election of the holder thereof at any time. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit for cash equal to the then value of a share of common stock of the Company. The Company may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (not owned by the Company and including LTIP Units assuming that all conditions had been met for the conversion thereof) and Series Two Preferred Units (on an as converted basis) had all of such units been redeemed at June 30, 2012 was approximately $1.97 billion and $146.6 million, respectively, based on the closing price of the Company’s common stock of $108.37 per share on June 30, 2012.

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Noncontrolling Interest—Property Partnerships

The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $(1.6) million at June 30, 2012 and approximately $(1.1) million at December 31, 2011, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

10. Stockholders’ Equity

As of June 30, 2012, the Company had 150,715,702 shares of Common Stock outstanding.

During the six months ended June 30, 2012, the Company utilized its $600 million “at the market” (“ATM”) stock offering program to issue an aggregate of 2,347,500 shares of Common Stock for gross proceeds of approximately $249.8 million and net proceeds of approximately $247.2 million. As of June 30, 2012, approximately $305.3 million remained available for issuance under this ATM program.

During the six months ended June 30, 2012, the Company issued 22,823 shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees.

During the six months ended June 30, 2012, the Company issued 225,835 shares of Common Stock in connection with the redemption of an equal number of OP Units.

On January 27, 2012, the Company paid a dividend in the amount of $0.55 per share of Common Stock to shareholders of record as of the close of business on December 31, 2011. On April 30, 2012, the Company paid a dividend in the amount of $0.55 per share of Common Stock to shareholders of record as of the close of business on March 30, 2012. On June 15, 2012, the Company’s Board of Directors declared a dividend in the amount of $0.55 per share of Common Stock payable on July 31, 2012 to shareholders of record as of the close of business on June 29, 2012.

11. 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. As a result, the Series Two Preferred Units are considered participating securities and are included in the computation of basic and diluted earnings per share of the Company if the effect of applying the if-converted method is dilutive. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of EPS pursuant to the two-class method. As a result, unvested restricted common stock of the Company, LTIP Units and OPP Units are considered participating securities and are included in the computation of basic and diluted earnings per share of the Company if the effect of applying the if-converted method is dilutive. Because the OPP 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

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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 June 30, 2012
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	85,889		150,312	$	0.57
Discontinued operations attributable to Boston Properties, Inc.		33,181		—		0.22
Net income attributable to Boston Properties, Inc.	$	119,070		150,312	$	0.79
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		382		—
Diluted Earnings:
Net income	$	119,070		150,694	$	0.79

	For the Three Months Ended June 30, 2011
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	60,331			145,864	$	0.41
Discontinued operations attributable to Boston Properties, Inc.		(117	)		—		—
Net income attributable to Boston Properties, Inc.	$	60,214			145,864	$	0.41
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			831		—
Diluted Earnings:
Net income	$	60,214			146,695	$	0.41

	For the six months ended June 30, 2012
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	134,219		149,328	$	0.90
Discontinued operations attributable to Boston Properties, Inc.		49,453		—		0.33
Net income attributable to Boston Properties, Inc.	$	183,672		149,328	$	1.23
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		392		—
Diluted Earnings:
Net income	$	183,672		149,720	$	1.23

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	For the Six Months Ended June 30, 2011
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	101,019			143,990	$	0.70
Discontinued operations attributable to Boston Properties, Inc.		(70	)		—		—
Net income attributable to Boston Properties, Inc.	$	100,949			143,990	$	0.70
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			620		—
Diluted Earnings:
Net income	$	100,949			144,610	$	0.70

12. Stock Option and Incentive Plan

On January 25, 2012, the Compensation Committee of the Board of Directors of the Company approved outperformance awards under the Company’s 1997 Stock Option and Incentive Plan (the “1997 Plan”) to certain officers of the Company. These awards (the “2012 OPP Awards”) are part of a broad-based, long-term incentive compensation program designed to provide the Company’s management team with the potential to earn equity awards subject to the Company “outperforming” and creating shareholder value in a pay-for-performance structure. 2012 OPP Awards utilize total return to shareholders (“TRS”) over a three-year measurement period as the performance metric and include two years of time-based vesting after the end of the performance measurement period (subject to acceleration in certain events) as a retention tool. Recipients of 2012 OPP Awards will share in an outperformance pool if the Company’s TRS, including both share appreciation and dividends, exceeds absolute and relative hurdles over a three-year measurement period from February 7, 2012 to February 6, 2015, based on the average closing price of a share of the Company’s common stock of $106.69 for the five trading days prior to and including February 7, 2012. The aggregate reward that recipients of all 2012 OPP Awards can earn, as measured by the outperformance pool, is subject to a maximum cap of $40.0 million.

The outperformance pool will consist of (i) two percent (2%) of the excess total return above a cumulative absolute TRS hurdle of 24% over the full three-year measurement period (equivalent to 8% per annum) (the “Absolute TRS Component”) and (ii) two percent (2%) of the excess or deficient excess total return above or below a relative TRS hurdle equal to the total return of the SNL Equity REIT Index over the three-year measurement period (the “Relative TRS Component”). In the event that the Relative TRS Component is potentially positive because the Company’s TRS is greater than the total return of the SNL Equity REIT Index, but the Company achieves a cumulative absolute TRS below 24% over the three-year measurement period (equivalent to 8% per annum), the actual contribution to the outperformance pool from the Relative TRS Component will be subject to a sliding scale factor as follows: (i) 100% of the potential Relative TRS Component will be earned if the Company’s TRS is equal to or greater than a cumulative 24% over three years, (ii) 0% will be earned if the Company’s TRS is 0% or less, and (iii) a percentage from 0% to 100% calculated by linear interpolation will be earned if the Company’s cumulative TRS over three years is between 0% and 24%. For example, if the Company achieves a cumulative absolute TRS of 18% over the full three-year measurement period (equivalent to a 6% absolute annual TRS), the potential Relative TRS Component would be prorated by 75%. The potential Relative TRS Component before application of the sliding scale factor will be capped at $40.0 million. In the event that the Relative TRS Component is negative because the Company’s TRS is less than the total return of the SNL Equity REIT Index, any outperformance reward potentially earned under the Absolute TRS Component will be reduced dollar for dollar, provided that the potential Absolute TRS Component before reduction for any negative Relative TRS Component will be capped at $40.0 million. The algebraic sum of the Absolute TRS Component and the Relative TRS Component determined as described above will never exceed $40.0 million.

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Each employee’s 2012 OPP Award was designated as a specified percentage of the aggregate outperformance pool. Assuming the applicable absolute and/or relative TRS thresholds are achieved at the end of the measurement period, the algebraic sum of the Absolute TRS Component and the Relative TRS Component will be calculated and then allocated among the 2012 OPP Award recipients in accordance with each individual’s percentage. If there is a change of control prior to February 6, 2015, the measurement period will end on the change of control date and both the Absolute TRS Component (using a prorated absolute TRS hurdle) and the Relative TRS Component will be calculated and, assuming the applicable absolute and/or relative TRS thresholds are achieved over the shorter measurement period, allocated among the 2012 OPP Award recipients as of that date.

Rewards earned with respect to 2012 OPP Awards (if any) will vest 25% on February 7, 2015, 25% on February 7, 2016 and 50% on February 7, 2017, based on continued employment. Vesting will be accelerated in the event of a change in control of the Company, termination of employment without cause, termination of employment by the award recipient for good reason, death, disability or retirement, although restrictions on transfer will continue to apply in certain of these situations. All determinations, interpretations and assumptions relating to the calculation of performance and vesting relating to 2012 OPP Awards will be made by the Compensation Committee. 2012 OPP Awards will be in the form of LTIP Units. LTIP Units will be issued prior to the determination of the outperformance pool, but will remain subject to forfeiture depending on the extent of rewards earned with respect to 2012 OPP Awards. The number of LTIP Units issued initially to recipients of the 2012 OPP Awards is an estimate of the maximum number of LTIP Units that they could earn, based on certain assumptions. The number of LTIP Units actually earned by each award recipient will be determined at the end of the performance measurement period by dividing his or her share of the outperformance pool by the average closing price of a REIT Share for the 15 trading days immediately preceding the measurement date. Total return for the Company and for the SNL Equity REIT Index over the three-year measurement period and other circumstances will determine how many LTIP Units are earned by each recipient; if they are fewer than the number issued initially, the balance will be forfeited as of the performance measurement date. Prior to the measurement date, LTIP units issued on account of 2012 OPP Awards 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 LTIP Units, both vested and unvested, which 2012 OPP Award recipients have earned based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit. LTIP Units are designed to qualify as “profits interests” in the Operating Partnership for federal income tax purposes. As a general matter, the profits interests characteristics of the LTIP Units mean that initially they will not be economically equivalent in value to an OP Unit. If and when events specified by applicable tax regulations occur, LTIP Units can over time increase in value up to the point where they are equivalent to OP Units on a one-for-one basis. After LTIP Units are fully vested, and to the extent the special tax rules applicable to profits interests have allowed them to become equivalent in value to OP Units, LTIP Units may be converted on a one-for-one basis into OP Units. OP Units in turn have a one-for-one relationship in value with Boston Properties, Inc. common stock, and are exchangeable on such one-for-one basis for cash or, at the election of the Company, Boston Properties, Inc. common stock.

The 2012 OPP Units were valued, in accordance with ASC 718 “Compensation—Stock Compensation,” at an aggregate of approximately $7.7 million utilizing a Monte Carlo simulation to estimate the probability of the performance vesting conditions being satisfied. The Monte Carlo simulation used a statistical formula underlying the Black-Scholes and binomial formulas and such simulation was run approximately 100,000 times. For each simulation, the payoff is calculated at the settlement date, which is then discounted to the award date at a risk-free interest rate. The average of the values over all simulations is the expected value of the unit on the award date. Assumptions used in the valuations included (1) factors associated with the underlying performance of the Company’s stock price and total shareholder return over the term of the performance awards including total stock return volatility and risk-free interest and (2) factors associated with the relative performance of the Company’s stock price and total shareholder return when compared to the SNL Equity REIT Index. The valuation was performed in a risk-neutral framework, so no assumption was made with respect to an equity risk premium. The

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fair value of the 2012 OPP Units is based on the sum of: (1) the present value of the expected payoff to the OPP Award on the measurement date, if the TRS over the applicable measurement period exceeds performance hurdles of the Absolute and the Relative Components; and (2) the present value of the distributions payable on the 2012 OPP Units. The ultimate reward realized on account of the OPP Award by the holders of the 2012 OPP Units is contingent on the TRS achieved on the measurement date, both in absolute terms and relative to the TRS of the SNL Equity REIT Index. The per unit fair value of each 2012 OPP Unit was estimated on the date of grant using the following assumptions in the Monte Carlo valuation: expected price volatility for the Company and the SNL Equity REIT index of 31% and 30%, respectively; a risk free rate of 0.35%; and total dividend payments over the measurement period of $7.28 per share.

On February 13, 2012, E. Mitchell Norville announced that he would resign as Executive Vice President, Chief Operating Officer of the Company effective on February 29, 2012. In connection with his resignation, Mr. Norville entered into a separation agreement (the “Separation Agreement”) with the Company. Under the Separation Agreement, the Company agreed to pay Mr. Norville cash payments totaling approximately $1,533,333 (less applicable deductions) in addition to his cash bonus for 2011, which was $950,000. In addition, Mr. Norville agreed to provide consulting services to the Company for at least two months following the effective date of his resignation for which he received $20,000 per month. Under the Separation Agreement, Mr. Norville is entitled to accelerated vesting with respect to 23,502 LTIP units in the Operating Partnership and stock options to purchase 4,464 shares of common stock at an exercise price of $92.71 and 5,117 shares of common stock at an exercise price of $104.47. Mr. Norville will also retain approximately 36% of his 2011 outperformance award, which will remain subject to the performance-based vesting criteria originally established for the 2011 outperformance awards. Mr. Norville agreed to one-year non-competition, non-solicitation and non-interference provisions, and provided the Company with a general release of claims. The Company recognized approximately $4.5 million of expense during the six months ended June 30, 2012 in connection with Mr. Norville’s resignation.

At the Company’s 2012 annual meeting of stockholders held on May 15, 2012, the stockholders of the Company approved the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”). The 2012 Plan replaces the 1997 Plan. The material terms of the 2012 Plan include, among other things: (1) the maximum number of shares of common stock reserved and available for issuance under the 2012 Plan is the sum of (i) 13,000,000 newly authorized shares, plus (ii) the number of shares available for grant under the 1997 Stock Plan immediately prior to the effective date of the 2012 Plan, plus (iii) any shares underlying grants under the 1997 Plan that are forfeited, cancelled or are terminated (other than by exercise) in the future; (2) “full-value” awards (i.e., awards other than stock options) are multiplied by a 2.32 conversion ratio to calculate the number of shares available under the 2012 Plan that are used for each full-value award, as opposed to a 1.0 conversion ratio for each stock option awarded under the 2012 Plan; (3) shares tendered or held back for taxes will not be added back to the reserved pool under the 2012 Plan; (4) stock options may not be re-priced without stockholder approval; and (5) the term of the 2012 Plan is for ten years from the date of stockholder approval.

During the six months ended June 30, 2012, the Company issued 20,756 shares of restricted common stock, 186,007 non-qualified stock options, 174,650 LTIP Units and 400,000 2012 OPP Units to employees and non-employee directors under the 1997 Plan and 2012 Plan. Employees and directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and OPP 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 six months ended June 30, 2012 were valued at approximately $2.2 million ($107.31 per share weighted-average). The non-qualified stock options granted during the six months ended June 30, 2012 had a weighted-average fair value on the date of grant of $19.50 per option, which was computed using the Black-Scholes

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option-pricing model utilizing the following weighted-average assumptions: an expected life of 5.4 years, a risk-free interest rate of 0.92%, an expected price volatility of 28.4% and an expected dividend yield of 2.9%. The weighted-average exercise price of the options is $107.23, which was the weighted-average closing price of the Company’s common stock on the date of grant. The LTIP Units granted during the six months ended June 30, 2012 were valued at approximately $17.3 million ($98.83 per unit fair value weighted-average) using a Monte Carlo simulation method model. The weighted-average per unit fair value of each LTIP Unit granted was estimated on the date of grant using the following assumptions: an expected life of 5.8 years, a risk-free interest rate of 0.94% and an expected price volatility of 29.1%. As the 2011 OPP Awards and 2012 OPP Awards are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2011 OPP Awards and 2012 OPP Awards under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in the Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, non-qualified stock options, LTIP Units, 2008 OPP Units, 2011 OPP Units and 2012 OPP Units was approximately $6.4 million and $5.6 million for the three months ended June 30, 2012 and 2011, respectively, and approximately $17.4 million and $17.2 million for the six months ended June 30, 2012 and 2011, respectively. For the six months ended June 30, 2012, stock-based compensation expense includes approximately $2.7 million consisting of the acceleration of vesting of the Company’s Chief Operating Officer’s stock-based compensation awards associated with his resignation. Upon the conclusion of the three-year measurement period in February 2011, the 2008 OPP Awards were not earned, the program was terminated and the Company accelerated the then remaining unrecognized compensation expense totaling approximately $4.3 million during the six months ended June 30, 2011. At June 30, 2012, there was $29.4 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $10.4 million of unrecognized compensation expense related to unvested 2011 OPP Units and 2012 OPP Units that is expected to be recognized over a weighted-average period of approximately 2.8 years.

13. Segment Information

The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by both geographic area and property type. The Company’s segments by geographic area are Boston, New York, Princeton, San Francisco and Washington, DC. Segments by property type include: Class A Office, Office/Technical, Residential and Hotel.

Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Interest and other income, development and management services, general and administrative expenses, transaction costs, interest expense, depreciation and amortization expense, gains (losses) from investments in securities, gains from early extinguishments of debt, income from unconsolidated joint ventures, discontinued operations and noncontrolling interests are not included in Net Operating Income as internal reporting addresses these items on a corporate level.

Net Operating Income is not a measure of operating results or cash flows from operating activities as measured by accounting principles generally accepted in the United States of America, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity. All companies may not calculate Net Operating Income in the same manner. The Company considers Net Operating Income to be an appropriate supplemental measure to net income because it helps both investors and management to understand the core operations of the Company’s properties.

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Information by geographic area and property type (dollars in thousands):

For the three months ended June 30, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	157,642		$	122,657		$	15,617		$	53,650		$	88,740		$	438,306
Office/Technical		5,744			—			—			144			4,054			9,942
Residential		1,013			—			—			—			4,023			5,036
Hotel		10,049			—			—			—			—			10,049
Total		174,448			122,657			15,617			53,794			96,817			463,333
% of Grand Totals		37.65	%		26.47	%		3.37	%		11.61	%		20.90	%		100.0	%
Rental Expenses:
Class A Office		60,504			38,936			7,691			21,188			28,306			156,625
Office/Technical		1,652			—			—			38			964			2,654
Residential		367			—			—			—			2,207			2,574
Hotel		6,616			—			—			—			—			6,616
Total		69,139			38,936			7,691			21,226			31,477			168,469
% of Grand Totals		41.04	%		23.11	%		4.57	%		12.60	%		18.68	%		100.0	%
Net operating income	$	105,309		$	83,721		$	7,926		$	32,568		$	65,340		$	294,864
% of Grand Totals		35.71	%		28.39	%		2.69	%		11.05	%		22.16	%		100.0	%

For the three months ended June 30, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	135,505		$	113,407		$	15,811		$	54,168		$	86,114		$	405,005
Office/Technical		6,337			—			—			—			3,950			10,287
Residential		—			—			—			—			576			576
Hotel		8,904			—			—			—			—			8,904
Total		150,746			113,407			15,811			54,168			90,640			424,772
% of Grand Totals		35.49	%		26.70	%		3.72	%		12.75	%		21.34	%		100.0	%
Rental Expenses:
Class A Office		50,772			37,378			7,487			20,118			24,365			140,120
Office/Technical		1,779			—			—			—			1,011			2,790
Residential		—			—			—			—			723			723
Hotel		6,281			—			—			—			—			6,281
Total		58,832			37,378			7,487			20,118			26,099			149,914
% of Grand Totals		39.25	%		24.93	%		4.99	%		13.42	%		17.41	%		100.0	%
Net operating income	$	91,914		$	76,029		$	8,324		$	34,050		$	64,541		$	274,858
% of Grand Totals		33.44	%		27.66	%		3.03	%		12.39	%		23.48	%		100.0	%

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For the six months ended June 30, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	298,650		$	240,246		$	30,467		$	105,847		$	179,137		$	854,347
Office/Technical		11,343			—			—			196			8,146			19,685
Residential		1,896			—			—			—			7,621			9,517
Hotel		16,865			—			—			—			—			16,865
Total		328,754			240,246			30,467			106,043			194,904			900,414
% of Grand Totals		36.51	%		26.68	%		3.38	%		11.78	%		21.65	%		100.0	%
Rental Expenses:
Class A Office		118,337			77,443			15,049			41,209			55,747			307,785
Office/Technical		3,152			—			—			62			2,011			5,225
Residential		757			—			—			—			4,532			5,289
Hotel		12,715			—			—			—			—			12,715
Total		134,961			77,443			15,049			41,271			62,290			331,014
% of Grand Totals		40.77	%		23.39	%		4.55	%		12.47	%		18.82	%		100.0	%
Net operating income	$	193,793		$	162,803		$	15,418		$	64,772		$	132,614		$	569,400
% of Grand Totals		34.03	%		28.59	%		2.71	%		11.38	%		23.29	%		100.0	%

For the six months ended June 30, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	262,302		$	226,414		$	32,090		$	107,061		$	168,795		$	796,662
Office/Technical		12,596			—			—			—			7,942			20,538
Residential		—			—			—			—			576			576
Hotel		14,852			—			—			—			—			14,852
Total		289,750			226,414			32,090			107,061			177,313			832,628
% of Grand Totals		34.80	%		27.19	%		3.85	%		12.86	%		21.30	%		100.0	%
Rental Expenses:
Class A Office		98,542			75,092			15,402			39,452			47,533			276,021
Office/Technical		3,647			—			—			—			2,133			5,780
Residential		—			—			—			—			723			723
Hotel		12,020			—			—			—			—			12,020
Total		114,209			75,092			15,402			39,452			50,389			294,544
% of Grand Totals		38.77	%		25.50	%		5.23	%		13.39	%		17.11	%		100.0	%
Net operating income	$	175,541		$	151,322		$	16,688		$	67,609		$	126,924		$	538,084
% of Grand Totals		32.62	%		28.12	%		3.10	%		12.57	%		23.59	%		100.0	%

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

	Three months ended June 30,					Six months ended June 30,
	2012		2011			2012			2011
Net Operating Income	$	294,864	$	274,858		$	569,400		$	538,084
Add:
Development and management services income		9,564		9,095			17,710			16,521
Income from unconsolidated joint ventures		21,191		8,882			32,912			16,858
Interest and other income		2,382		1,953			4,028			2,927
Gains from early extinguishments of debt		274		—			1,041			—
Income (loss) from discontinued operations		398		(132	)		884			(80	)
Gain on sale of real estate from discontinued operations		36,877		—			36,877			—
Gain on forgiveness of debt from discontinued operations		—		—			17,807			—
Less:
General and administrative expense		19,066		18,721			46,685			43,364
Transaction costs		8		1,361			2,112			1,433
Depreciation and amortization expense		111,643		110,259			220,583			218,852
Interest expense		99,901		94,583			203,138			193,108
Losses (gains) from investments in securities		186		(6	)		(615	)		(379	)
Noncontrolling interest in property partnerships		457		503			1,003			1,032
Noncontrolling interest—redeemable preferred units of the Operating Partnership		765		842			1,566			1,665
Noncontrolling interest—common units of the Operating Partnership		10,360		8,194			16,400			14,296
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		4,094		(15	)		6,115			(10	)
Net income attributable to Boston Properties, Inc.	$	119,070	$	60,214		$	183,672		$	100,949

14. Subsequent Events

On July 13, 2012, the Company executed an agreement to form a joint venture, which upon closing will own and operate Fountain Square, an approximately 811,000 net rentable square foot office and retail complex located in Reston, Virginia, adjacent to the Company’s other Reston properties. The joint venture partner will contribute the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a 50% interest in the joint venture. The Company expects to contribute cash totaling approximately $87.0 million for its 50% interest, which cash will be distributed to the joint venture partner. The Company expects to consolidate this joint venture. The mortgage loan bears interest at fixed rate of 5.71% per annum and matures on October 11, 2016. Pursuant to the joint venture agreement (i) the Company has rights to acquire the partner’s 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.

On July 25, 2012, the Company’s Operating Partnership issued notice to redeem the remaining $225.0 million in aggregate principal amount of its 6.25% senior notes due 2013 on August 24, 2012. The Company expects to fund this redemption using available cash. The redemption price will equal the sum of (i) 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 (ii) accrued interest to, but excluding, August 24, 2012, 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 August 24, 2012 in accordance with the terms of the applicable indenture.

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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 impact of high unemployment and other macroeconomic trends, which is 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, dependence on tenants’ financial condition, and competition from other developers, owners and operators of real estate);

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

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

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

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

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

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• 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 five markets-Boston, New York, Princeton, San Francisco and Washington, DC. We generate revenue and cash primarily by leasing our 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, 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 operate in supply-constrained markets with high barriers to entry and to focus on executing long-term leases with financially strong tenants. Historically, this combination has tended to reduce our exposure in down cycles and enhance revenues as market conditions improve. To be successful in the current leasing environment, we believe all aspects of the tenant-landlord relationship must be considered. In this regard, we believe that our understanding of tenants’ short- and long-term space needs in the local markets, our relationships with local brokers, our reputation as a premier owner and operator of Class A office properties, our financial strength and our ability to maintain high building standards provide us with a competitive advantage

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in an increasingly fragmented office market. We expect tenants in our markets to continue to take advantage of the ability to upgrade to high-quality space like ours, particularly those who value our operational expertise and financial stability when making their leasing decisions.

After several strong quarters, leasing velocity slowed during the second quarter in Cambridge, Massachusetts and the Central Business District (CBD) and suburban submarkets of San Francisco. Overall trends in these markets are still positive with higher rental rates, which suggest that there are sectors of the economy driven by innovation that are growing despite the uncertain and challenging macroeconomic issues. In the midtown Manhattan market, leasing activity in the second quarter was less than recent historical averages and the availability rate increased slightly. We continued to see activity in our portfolio as we signed leases for approximately 589,000 square feet during the quarter, including a long-term extension with an existing 487,000 square foot tenant. In Washington, DC, the leasing activity continues to be slow and public sector demand has been adversely impacted by the federal budgetary uncertainty, potential sequestration and the reductions in discretionary spending programs. Our assets in the Boston CBD continue to experience demand with tenants committing to space two to three years in advance of their space needs, while the general market has a vacancy percentage rate in the mid-teens most of which is in low-rise space. During the second quarter absorption was positive and the vacancy rate is modestly improving. The suburbs of Boston along Route 128, where the majority of our suburban assets are located, are also improving modestly with new business creation and technology tenant expansion partially offset by corporate mergers and headcount reductions.

In the second quarter of 2012, leases for approximately 1.0 million square feet of space commenced revenue recognition, including leases for approximately 926,000 square feet of second generation space and leases for approximately 68,000 square feet of first generation space, stemming mostly from completion of development projects. Of the approximately 1.0 million square feet, leases for approximately 196,000 square feet were signed during the second quarter of 2012 and leases for the remainder of this space were signed in prior periods. The second generation leases that commenced revenue recognition in the second quarter of 2012 had an average lease term of approximately 87 months and included an average of approximately 81 days of free rent and total transaction costs, including tenant improvements and leasing commissions, of approximately $40 per square foot. The starting gross rents for the approximately 786,000 square feet of second generation leases that had been occupied within the prior 12 months increased on average by approximately 0.36% compared to the ending gross rents from the previous leases for this space. Lease terms are highly dependent on location (i.e., whether the property is in a CBD or suburban location), whether the lease is a renewal or with a new tenant, and the length of the lease term.

As of June 30, 2012, leases representing approximately 2.8% of the space at our properties expire through December 31, 2012. While rental rates in our markets have stabilized, as leases expire in 2012, assuming no further change in current market rental rates, we expect that the rental rates we are likely to achieve on new leases will generally be slightly less than the rates currently being paid, thereby generally resulting in less revenue from the same space.

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 2015. In 2012, we fully placed in-service 510 Madison Avenue in New York City and One Patriots Park in Reston, Virginia and expect to partially or fully place in-service Annapolis Junction Building Six in Annapolis, Maryland and 500 North Capitol Street, NW in Washington, DC with an aggregate estimated investment of approximately $493 million, which represents our share. In aggregate, these assets are currently 71% leased.

We also continue to actively explore acquisition opportunities. In July 2012, we executed an agreement to form a joint venture to own 50% of and to operate Fountain Square, an approximately 811,000 net rentable square foot office and retail complex located in Reston, Virginia, for an aggregate asset value of $385 million (see Note 14 to the Consolidated Financial Statements). We believe acquisition opportunities will continue to present themselves; however, with the combination of relatively low interest rates and an abundance of capital,

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seeking high-quality assets may have a dampening effect on return expectations. While we are primarily focused on opportunities in our existing markets, we are open to investments in new markets both in the United States and possibly outside the United States. We are primarily interested in investing in markets that share common traits with our existing core markets, namely 24-hour world class cities with highly educated work forces, high barriers to entry and a diverse and strong international tenant base, and in which we would expect to establish an operating platform over time. We intend to carefully evaluate the risks inherent in investing in any new markets and maintain our disciplined investment strategy, which focuses on high-quality assets in supply-constrained markets that have historically provided long-term value creation. In addition, we believe that our existing cash balance, availability under our Operating Partnership’s Unsecured Line of Credit and access to a wide range of debt and equity financing alternatives provide us with ample capital to pursue acquisition opportunities.

We continue to review our portfolio for the possible sale of non-core assets where the leasing profile provides an opportunity to maximize value. On May 17, 2012, we completed the sale of our Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash, which was structured for tax purposes as a Like-Kind Exchange.

Transactions during the three months ended June 30, 2012 included the following:

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

• On April 30, 2012, we fully placed in-service 510 Madison Avenue, a Class A office project with approximately 356,000 net rentable square feet located in New York City. The property is currently 55% leased.

• On May 4, 2012, we completed and fully placed in-service One Patriots Park (formerly known as 12310 Sunrise Valley Drive), a Class A office redevelopment project with approximately 268,000 net rentable square feet located in Reston, Virginia. The property is 100% leased.

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

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

• On June 11, 2012, our Operating Partnership completed a public offering of $1.0 billion in aggregate principal amount of its 3.850% senior unsecured notes due 2023. The notes were priced at 99.779% of the principal amount to yield an effective rate (including financing fees) of 3.954% to maturity. The notes will mature on February 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $989.4 million after deducting underwriting discounts and transaction expenses.

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• During the second quarter of 2012, we utilized our $600 million “at the market” (“ATM”) stock offering program to issue an aggregate of 1,298,700 shares of our common stock for gross proceeds of approximately $139.2 million and net proceeds of approximately $137.9 million. We intend to use the net proceeds from the sales for general business purposes, which may include investment opportunities and debt reduction. As of June 30, 2012, approximately $305.3 million remained available for issuance under this ATM program.

Transactions completed subsequent to June 30, 2012:

• On July 13, 2012, we executed an agreement to form a joint venture, which upon closing will own and operate Fountain Square, an approximately 811,000 net rentable square foot office and retail complex located in Reston, Virginia, adjacent to our other Reston properties. The joint venture partner will contribute the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a 50% interest in the joint venture. We expect to contribute cash totaling approximately $87.0 million for our 50% interest, which cash will be distributed to the joint venture partner. We expect to consolidate this joint venture. The mortgage loan bears interest at fixed rate of 5.71% per annum and matures on October 11, 2016. Pursuant to the joint venture agreement (i) we have rights to acquire the partner’s 50% interest and (ii) the partner has the right to cause us to acquire the partner’s interest on January 4, 2016, in each case at a fixed price totaling approximately $102.0 million in cash. The fixed price option rights expire on January 31, 2016. We expect to complete the formation of the joint venture by the end of the third quarter of 2012; however, there can be no assurance that the transaction will close on the terms currently contemplated or at all.

• On July 25, 2012, our Operating Partnership issued notice to redeem the remaining $225.0 million in aggregate principal amount of its 6.25% senior notes due 2013 on August 24, 2012. Our Operating Partnership expects to fund this redemption using available cash. The redemption price will equal the sum of (i) 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 (ii) accrued interest to, but excluding, August 24, 2012, 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 August 24, 2012 in accordance with the terms of the applicable indenture. In connection with the redemption, we expect (1) to recognize a loss on extinguishment of debt in the third quarter of 2012 of approximately $5.3 million as a result of the redemption premium and (2) a reduction in future interest payments from the redemption date through the stated maturity date of January 15, 2013 of approximately $5.7 million.

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.

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Real Estate

Upon acquisitions of real estate, we assess the fair value of acquired tangible and intangible assets, including land, buildings, tenant improvements, “above-” and “below-market” leases, 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 at appraised value 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. Other intangible assets acquired include amounts for in-place lease values that are based on our evaluation of the specific characteristics of each tenant’s lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, we consider leasing commissions, legal and other related expenses.

Management reviews its long-lived assets used in operations 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. Because 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 impairment has occurred, the affected assets must be reduced to their fair value.

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

35

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.

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. Beginning January 1, 2009, we are required to expense costs the acquirer incurs to effect a business combination such as legal, due diligence and other closing related costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for occupancy and capitalization must cease, involves a degree of judgment. Our capitalization policy on development properties is guided by guidance in ASC 835-20 “Capitalization of Interest” and ASC 970 “Real Estate—General.” The costs of land and buildings under development include specifically identifiable costs.

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

Investments in Unconsolidated Joint Ventures

Except for ownership interests in VIEs for which we are the primary beneficiary, we account for our investments in joint ventures under the equity method of accounting because we exercise significant influence over, but do not control, these entities. Our judgment with respect to our level of influence or control of an entity and whether we are the primary beneficiary of a VIE 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.

These investments are recorded initially at cost, as Investments in Unconsolidated Joint Ventures, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on our 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 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. For ownership interests in VIEs, we consolidate those in which we are the primary beneficiary. 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 value below the carrying values have occurred and such decline is other-than-temporary. The ultimate realization of our investment in unconsolidated joint ventures is dependent on a number of factors, including the performance of each investment and market

36

conditions. We will record an impairment charge if we determine that a decline in the 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. 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

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

For the three and six months ended June 30, 2012, the impact of the net adjustments of rents from “above-” and “below-market” leases increased rental revenue by approximately $3.8 million and $6.8 million, respectively. For the three and six months ended June 30, 2012, the impact of the straight-line rent adjustment increased rental revenue by approximately $20.3 million and $39.3 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) low risk tenants;

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

• require a security deposit; and/or

• reduce upfront tenant improvement investments; or

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

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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 7.1 years as of June 30, 2012. 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 hotel revenues are derived from room rentals and other sources such as charges to guests for long-distance telephone service, fax machine use, 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. 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 criteria for the full accrual method are not met, we defer some or all of the gain recognition and account for the continued operations of the property by applying the finance, leasing, profit sharing, deposit, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Depreciation and Amortization

We compute depreciation and amortization on our properties using the straight-line method based on estimated useful asset lives. We allocate the acquisition cost of real estate to land, building, tenant improvements,

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acquired “above-” and “below-market” leases, origination costs and acquired in-place leases based on an assessment of their fair value 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

For purposes of disclosure, we calculate the fair value of our mortgage notes payable and unsecured senior notes. We discount the spread between the future contractual interest payments and hypothetical future interest payments on our mortgage debt and unsecured notes based on a current market rate. In determining the current market rate, we add our estimate of a market spread to the quoted yields on federal government treasury securities with similar maturity dates to our own debt. Because our valuations of our financial instruments are based on these types of estimates, the actual fair value of our financial instruments may differ materially if our estimates do not prove to be accurate.

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.

Results of Operations

The following discussion is based on our Consolidated Financial Statements for the three and six months ended June 30, 2012 and 2011.

At June 30, 2012 and June 30, 2011, we owned or had interests in a portfolio of 150 and 152 properties, respectively (in each case, the “Total Property Portfolio”). As a result of changes within our Total Property Portfolio, the financial data presented below shows significant changes in revenue and expenses from period-to-period. Accordingly, we do not believe that our period-to-period financial data with respect to the Total Property Portfolio are necessarily meaningful. Therefore, the comparison of operating results for the three and six months ended June 30, 2012 and 2011 show separately the changes attributable to the properties that were owned by us and in service throughout each period compared (the “Same Property Portfolio”) and the changes attributable to the properties included in the Placed In-Service, Acquired or Development or Redevelopment Portfolios.

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

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

39

and management services revenue. We use NOI internally as a performance measure and believe NOI provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. Therefore, we believe NOI is a useful measure for evaluating the operating performance of our real estate assets.

Our management also uses NOI to evaluate regional property level performance and to make decisions about resource allocations. Further, we believe NOI is useful to investors as a performance measure because, when compared across periods, NOI reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. NOI excludes certain components from net income attributable to Boston Properties, Inc. in order to provide results that are more closely related to 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 13 to the Consolidated Financial Statements.

Comparison of the six months ended June 30, 2012 to the six months ended June 30, 2011.

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 124 properties totaling approximately 31.6 million net rentable square feet of space, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to January 1, 2011 and owned and in service through June 30, 2012. The Total Property Portfolio includes the effects of the other properties either placed in-service, acquired or in development or redevelopment after January 1, 2011 or disposed of on or prior to June 30, 2012. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the six months ended June 30, 2012 and 2011 with respect to the properties which were placed in-service, acquired or in development or redevelopment.

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	Same Property Portfolio										Properties Acquired Portfolio					Properties Placed In-Service Portfolio					Properties in  Development or Redevelopment Portfolio						Total Property Portfolio
(dollars in thousands)	2012		2011		Increase/ (Decrease)			% Change			2012		2011			2012		2011			2012			2011			2012			2011			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	784,132	$	775,540	$	8,592			1.11	%	$	33,797	$	8,919		$	58,511	$	25,844		$	(34	)	$	5,259		$	876,406		$	815,562		$	60,844			7.46	%
Termination Income		4,398		2,214		2,184			98.64	%		174		—			—		—			2,571			—			7,143			2,214			4,929			222.63	%
Total Rental Revenue		788,530		777,754		10,776			1.39	%		33,971		8,919			58,511		25,844			2,537			5,259			883,549			817,776			65,773			8.04	%
Real Estate Operating Expenses		278,332		266,538		11,794			4.42	%		15,455		5,229			24,498		9,004			14			1,753			318,299			282,524			35,775			12.66	%
Net Operating Income, excluding hotel		510,198		511,216		(1,018	)		(0.20	)%		18,516		3,690			34,013		16,840			2,523			3,506			565,250			535,252			29,998			5.60	%
Hotel Net Operating Income(1)		4,150		2,832		1,318			46.54	%		—		—			—		—			—			—			4,150			2,832			1,318			46.54	%
Consolidated Net Operating Income(1)		514,348		514,048		300			0.06	%		18,516		3,690			34,013		16,840			2,523			3,506			569,400			538,084			31,316			5.82	%
Other Revenue:
Development and management services		—		—		—			—			—		—			—		—			—			—			17,710			16,521			1,189			7.20	%
Other Expenses:
General and administrative expense		—		—		—			—			—		—			—		—			—			—			46,685			43,364			3,321			7.66	%
Transaction costs		—		—		—			—			—		—			—		—			—			—			2,112			1,433			679			47.38	%
Depreciation and amortization		185,486		182,135		3,351			1.84	%		15,991		6,212			17,223		23,191			1,883			7,314			220,583			218,852			1,731			0.79	%
Total Other Expenses		185,486		182,135		3,351			1.84	%		15,991		6,212			17,223		23,191			1,883			7,314			269,380			263,649			5,731			2.17	%
Operating Income		328,862		331,913		(3,051	)		(0.92	)%		2,525		(2,522	)		16,790		(6,351	)		640			(3,808	)		317,730			290,956			26,774			9.20	%
Other Income:
Income from unconsolidated joint ventures																												32,912			16,858			16,054			95.23	%
Interest and other income																												4,028			2,927			1,101			37.62	%
Gains from investments in securities																												615			379			236			62.27	%
Gains from early extinguishments of debt																												1,041			—			1,041			100.00	%
Other Expenses:
Interest expense																												203,138			193,108			10,030			5.19	%
Income from continuing operations																												153,188			118,012			35,176			29.81	%
Discontinued operations:
Income (loss) from discontinued operations																												884			(80	)		964			1,205.00	%
Gain on sale of real estate from discontinued operations																												36,877			—			36,877			100.00	%
Gain on forgiveness of debt from discontinued operations																												17,807			—			17,807			100.00	%
Net income																												208,756			117,932			90,824			77.01	%
Net income attributable to noncontrolling interests:
Noncontrolling interests in property partnerships																												(1,003	)		(1,032	)		29			2.81	%
Noncontrolling interest—redeemable preferred units of the Operating Partnership																												(1,566	)		(1,665	)		99			5.95	%
Noncontrolling interest—common units of the Operating Partnership																												(16,400	)		(14,296	)		(2,104	)		(14.72	)%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																												(6,115	)		10			(6,125	)		(61,250.00	)%
Net Income attributable to Boston Properties, Inc.																											$	183,672		$	100,949		$	82,723			81.95	%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 39. Hotel Net Operating Income for the six months ended June 30, 2012 and 2011 are comprised of Hotel Revenue of $16,865 and $14,852 less Hotel Expenses of $12,715 and $12,020, 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 $8.6 million for the six months ended June 30, 2012 compared to 2011. The increase was primarily the result of an increase of approximately $3.6 million in rental revenue from our leases, an increase in parking and other revenue of approximately $3.7 million, which was mainly due to an increase in transient parking and an increase in other recoveries of approximately $1.3 million. The increase in rental revenue from our leases of approximately $3.6 million is the result of our average revenue increasing by approximately $0.41 per square foot, contributing approximately $5.9 million, offset by an approximately $2.3 million decrease due to a decline in average occupancy from 92.7% to 92.2%.

We expect rental revenue for the remainder of 2012 from the Same Property Portfolio to continue to be impacted by the transitionary revenue declines associated with the expiration of leases at Gateway Center in South San Francisco, Three Patriots Park in Reston, Virginia where the full-building user vacated on May 31, 2012, and the expiration of an approximately 150,000 square foot lease at 399 Park Avenue in New York City in July 2012. Although we have re-leased a portion of the 399 Park Avenue space, there will be an interruption in rental revenue as rent has yet to commence for a portion of the space. We expect our occupancy to be between 91% and 92% for 2012. However, we expect the aforementioned vacancies will result in a decrease of approximately 0.5% to 1% in Same Property Portfolio net operating income in 2012 compared to the comparable periods of 2011.

Termination Income

Termination income increased by approximately $2.2 million for the six months ended June 30, 2012 compared to 2011.

Termination income for the six months ended June 30, 2012 related to eleven tenants across the Same Property Portfolio and totaled approximately $4.4 million of which approximately $3.6 million was from the settlement of a bankruptcy claim against a former tenant that rejected our lease in 2009.

Termination income for the six months ended June 30, 2011 related to six tenants across the Same Property Portfolio and totaled approximately $2.2 million, which included approximately $1.8 million of termination income related to a default by a 30,000 square foot law firm tenant in one of our New York City assets.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $11.8 million for the six months ended June 30, 2012 compared to 2011. This increase was primarily due to (1) an increase of approximately $6.2 million in real estate taxes, which was primarily in our Boston and Washington, DC regions, (2) an approximately $3.2 million cumulative non-cash straight-line adjustment for ground rent expense (refer to Note 2 to the Consolidated Financial Statements) and (3) an approximately $2.4 million increase in other property operating expenses.

Depreciation and Amortization Expense

Depreciation and amortization expense for the Same Property Portfolio increased approximately $3.4 million, or 1.8%, for the six months ended June 30, 2012 compared to 2011.

Properties Acquired Portfolio

On February 1, 2011, we completed the acquisition of Bay Colony Corporate Center in Waltham, Massachusetts for an aggregate purchase price of approximately $185.0 million. Bay Colony Corporate Center is

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an approximately 985,000 net rentable square foot, four-building Class A office park situated on a 58-acre site in Waltham, Massachusetts.

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

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

On March 13, 2012, we acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash. In connection with the transaction, we entered into a long-term lease with an affiliate of Bank of America for approximately 735,000 square feet. 100 Federal Street is an approximately 1,264,000 net rentable square foot, 37-story Class A office tower.

Rental Revenue

Rental revenue from our Properties Acquired Portfolio increased approximately $25.1 million for the six months ended June 30, 2012 compared to 2011, as detailed below:

Property	Date Acquired	Rental Revenue for the six months ended June 30,
		2012		2011		Change
		(in thousands)
Bay Colony Corporate Center	February 1, 2011	$	10,259	$	8,919	$	1,340
2440 West El Camino Real	November 22, 2011		3,969		—		3,969
453 Ravendale Drive	March 1, 2012		196		—		196
100 Federal Street	March 13, 2012		19,547		—		19,547
Total		$	33,971	$	8,919	$	25,052

Real Estate Operating Expenses

Real estate operating expenses from our Properties Acquired Portfolio increased approximately $10.2 million for the six months ended June 30, 2012 compared to 2011, as detailed below:

Property	Date Acquired	Real Estate Operating Expenses for the six months ended June 30,
		2012		2011		Change
		(in thousands)
Bay Colony Corporate Center	February 1, 2011	$	6,122	$	5,229	$	893
2440 West El Camino Real	November 22, 2011		1,189		—		1,189
453 Ravendale Drive	March 1, 2012		62		—		62
100 Federal Street	March 13, 2012		8,082		—		8,082
Total		$	15,455	$	5,229	$	10,226

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Acquired Portfolio increased by approximately $9.8 million for the six months ended June 30, 2012 compared to 2011 as a result of the acquisition of properties after June 30, 2011, as well as the additional depreciation expense incurred for the six months ended June 30, 2012 associated with Bay Colony Corporate Center that was acquired on February 1, 2011 and, as a result, was not recognizing depreciation expense for the full six months ended June 30, 2011.

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Properties Placed In-Service Portfolio

At June 30, 2012, we had six additional properties totaling approximately 2,290,000 square feet that were placed in-service or partially placed in-service between January 1, 2011 and June 30, 2012.

Rental Revenue

Rental revenue from our Properties Placed In-Service Portfolio increased approximately $32.7 million for the six months ended June 30, 2012 compared to 2011, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Rental Revenue for the six months ended June 30,
			2012		2011		Change
			(in thousands)
2200 Pennsylvania Avenue	First Quarter, 2011	Third Quarter, 2011	$	15,010	$	3,938	$	11,072
Residences on The Avenue	Second Quarter, 2011	Third Quarter, 2011		7,621		576		7,045
The Lofts at Atlantic Wharf	Third Quarter, 2011	Third Quarter, 2011		1,896		—		1,896
Atlantic Wharf—Office	First Quarter, 2011	Fourth Quarter, 2011		23,762		14,617		9,145
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012		8,864		1,260		7,604
One Patriots Park (formerly known as 12310 Sunrise Valley Drive)	Second Quarter, 2012	Second Quarter, 2012		1,358		5,453		(4,095	)
Total			$	58,511	$	25,844	$	32,667

Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $15.5 million for the six months ended June 30, 2012 compared to 2011, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service	Real Estate Operating Expenses for the six months ended June 30,
			2012		2011		Change
			(in thousands)
2200 Pennsylvania Avenue	First Quarter, 2011	Third Quarter, 2011	$	9,205	$	2,619	$	6,586
Residences on The Avenue	Second Quarter, 2011	Third Quarter, 2011		4,532		723		3,809
The Lofts at Atlantic Wharf	Third Quarter, 2011	Third Quarter, 2011		757		—		757
Atlantic Wharf—Office	First Quarter, 2011	Fourth Quarter, 2011		7,141		4,083		3,058
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012		2,561		608		1,953
One Patriots Park (formerly known as 12310 Sunrise Valley Drive)	Second Quarter, 2012	Second Quarter, 2012		302		971		(669	)
Total			$	24,498	$	9,004	$	15,494

Real estate operating expenses for 2200 Pennsylvania Avenue and the Residences on The Avenue include ground rent expense, which includes the non-cash straight-lining of the ground rent expense of approximately $5.5 million and $2.6 million, respectively, for the six months ended June 30, 2012 and $1.3 million and $0.3 million, respectively, for the six months ended June 30, 2011.

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio decreased by approximately $6.0 million for the six months ended June 30, 2012 compared to 2011. This decrease was due to an approximately $16.0 million decrease in depreciation expense for One Patriots Park as the result of the acceleration of depreciation expense during the six months ended June 30, 2011 in conjunction with the redevelopment of this building partially offset by an approximately $10.0 million increase in depreciation expense at the other buildings that were placed in-service.

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Properties in Development or Redevelopment Portfolio

At June 30, 2012 and 2011, the Properties in Development or Redevelopment Portfolio consisted primarily of our 250 West 55th Street development project located in New York City and our Two Patriots Park (formerly known as 12300 Sunrise Valley Drive) property located in Reston, Virginia.

On February 6, 2009, we announced that we were suspending construction on our 989,000 square foot office project at 250 West 55^th Street in New York City. During December 2009, we completed the construction of foundations and steel/deck to grade to facilitate a restart of construction in the future and as a result ceased interest capitalization on the project. During the six months ended June 30, 2011, we recognized approximately $0.8 million of additional costs associated with the suspension and ongoing maintenance of the development project. On May 24, 2011, we signed a lease with the law firm of Morrison & Foerster LLP for approximately 184,000 square feet at 250 West 55^th Street and construction of the project has resumed. As a result of our decision to resume development, in May 2011 we began interest capitalization and are no longer expensing costs associated with this project.

On July 1, 2011, we entered into lease amendments with the existing tenant at our three-building complex on Sunrise Valley Drive in Reston, Virginia, which will be redeveloped as the headquarters for the Defense Intelligence Agency. Under the agreements, the existing tenant terminated early its leases for approximately 523,000 square feet at the complex and was responsible for certain payments to us aggregating approximately $14.8 million. We recognized approximately $12.2 million of such termination income during 2011 and the remaining approximately $2.6 million during the six months ended June 30, 2012. On January 3, 2012, we commenced the redevelopment of our Two Patriots Park property at the complex, which is expected to be completed during the second quarter of 2013. During the six months ended June 30, 2011, this building had revenue, excluding termination income, of approximately $5.3 million and operating expenses of approximately $0.9 million. During the six months ended June 30, 2012, excluding termination income, this building had de- minimis revenue and operating expenses. In addition, the decrease in depreciation of approximately $5.4 million is the result of the acceleration of depreciation expense during the six months ended June 30, 2011 in conjunction with the redevelopment of this building.

Other Operating Income and Expense Items

Hotel Net Operating Income

Net operating income for the Cambridge Center Marriott hotel property increased by approximately $1.3 million for the six months ended June 30, 2012 compared to 2011. We expect our hotel net operating income for fiscal 2012 to be between $9.0 million and $10.0 million.

The following reflects our occupancy and rate information for the Cambridge Center Marriott hotel for the six months ended June 30, 2012 and 2011.

	2012			2011			Percentage Change
Occupancy		80.4	%		77.4	%		3.9	%
Average daily rate	$	214.57		$	201.17			6.7	%
Revenue per available room, REVPAR	$	172.51		$	155.61			10.9	%

Development and Management Services

Development and management services income increased approximately $1.2 million for the six months ended June 30, 2012 compared to 2011. The increase was primarily due to an increase in development fee income of approximately $2.5 million partially offset by a decrease in management fee income of approximately $1.3 million. The increase in development fees is primarily due to an increase in fees associated with tenant

45

improvement project management. The decrease in management fees is due to a decrease in leasing fees earned from our joint venture properties. We expect fee income for fiscal 2012 to be between $30 million and $34 million.

General and Administrative

General and administrative expenses increased approximately $3.3 million for the six months ended June 30, 2012 compared to 2011. We recognized approximately $4.5 million of expense during the first quarter of 2012 in connection with the resignation or E. Mitchell Norville, our Chief Operating Officer, on February 29, 2012. This increase was partially offset by the acceleration of the remaining unrecognized compensation expense totaling approximately $4.3 million associated with the termination of the 2008 OPP Awards during the first quarter of 2011, which did not recur in 2012. The remaining increase was primarily due to (1) an approximately $1.7 million increase related to the issuance of the 2012 OPP Awards and non-qualified stock options, (2) an approximately $0.5 million increase in taxes, (3) an approximately $0.3 million increase in professional fees and (4) an approximately $0.6 million increase in other general and administrative expenses, which includes compensation expense. Refer to Note 12 of the Consolidated Financial Statements for additional information regarding Mr. Norville’s resignation and the issuance of the 2012 OPP Awards and non-qualified stock options. We expect general and administrative expense for fiscal 2012 to be between $85 million and $87 million.

Wages directly related to the development of rental properties are not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Capitalized wages for the six months ended June 30, 2012 and 2011 were approximately $6.0 million and $5.5 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

During the six months ended June 30, 2012, we incurred approximately $2.1 million of transaction costs of which approximately $0.5 million related to the acquisition of 100 Federal Street in Boston, Massachusetts and $1.6 million related to the pursuit of other transactions. During the six months ended June 30, 2011, we incurred approximately $1.4 million of transaction pursuit costs.

Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the six months ended June 30, 2012 compared to 2011, income from unconsolidated joint ventures increased by approximately $16.1 million. On May 14, 2012, an unconsolidated joint venture in which we have a 60% interest entered into a lease termination agreement with an existing tenant at its General Motors Building in New York City. Under the agreement, the tenant terminated early its lease for approximately 36,000 square feet at the building and is responsible for certain payments to the unconsolidated joint venture aggregating approximately $28.4 million through May 1, 2014 (of which our share is approximately $17.0 million). As a result of the termination, we recognized termination income totaling approximately $11.8 million (which is net of the write-off of the accrued straight-line rent balance) during the second quarter of 2012. In addition, our other unconsolidated joint ventures contributed approximately $4.3 million of the increase. Refer to Note 4 of the Consolidated Financial Statements for additional details regarding the operating results of our unconsolidated joint ventures. For fiscal 2012, we expect the income from our unconsolidated joint ventures to decrease by approximately $37 million to $42 million (our share) compared to fiscal 2011 due to (1) the sale of Two Grand Central Tower on October 25, 2011, located in New York City, which contributed a gain on sale of approximately $28 million (our share) and income from operations of approximately $5 million (our share) in 2011, (2) a net decrease of approximately $15 million (our share) of “above-“ and “below-market” rent adjustments under ASC 805 “Business Combinations” and (4) an overall decrease in revenues of approximately

46

$1 million to $6 million (our share) at our New York City joint ventures due to downtime from lease terminations and expirations. These decreases are offset by termination income of approximately $12 million (our share) recognized during the second quarter of 2012.

Interest and Other Income

Interest and other income increased approximately $1.1 million for the six months ended June 30, 2012 compared to 2011. Interest income for the six months ended June 30, 2012 compared to 2011 increased approximately $0.8 million due to an increase in the average cash balance partially offset by overall lower interest rates. The average daily cash balances for the six months ended June 30, 2012 and June 30, 2011 were approximately $1.1 billion and $0.9 billion, respectively.

Other income for the six months ended June 30, 2012 compared to 2011 increased by approximately $0.3 million of which $1.1 million was related to an insurance claim that we received during 2012. On June 6, 2006, we sold 280 Park Avenue in New York City. In connection with the sale, in lieu of a closing adjustment in favor of the buyer for certain unfunded tenant improvements, we retained the obligation to pay for the improvements, subject to the tenant initiating the request for reimbursement. The total amount of unfunded tenant improvements at closing was approximately $1.0 million and has yet to be requested by the tenants. During the six months ended June 30, 2011, a tenant’s lease expired for which we had unfunded tenant improvement liabilities of approximately $0.8 million, resulting in the recognition of other income in that amount.

Gains from Investments in Securities

Gains from investments in securities for the six months ended June 30, 2012 and 2011 related to investments that we have made to reduce our market risk relating to a deferred compensation plan that we maintain for our officers. Under this deferred compensation plan, each officer who is eligible to participate is permitted to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. In order to reduce our market risk relating to this plan, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer. This enables us to generally match our liabilities to our officers under the deferred compensation plan with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains from investments in securities. During the six months ended June 30, 2012 and 2011, we recognized gains of approximately $0.6 million and $0.4 million, respectively, on these investments. By comparison, our general and administrative expense increased by approximately $0.5 million and $0.4 million during the six months ended June 30, 2012 and 2011, 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 2, 2012, we used available cash to repay the mortgage loan collateralized by our One Freedom Square property located in Reston, Virginia totaling $65.1 million. The mortgage financing bore interest at a fixed rate of 7.75% per annum and was scheduled to mature on June 30, 2012. There was no prepayment penalty. We recognized a gain on early extinguishment of debt totaling approximately $0.3 million related to the acceleration of the remaining balance of the historical fair value debt adjustment.

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

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

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Interest Expense

Interest expense for the Total Property Portfolio increased approximately $10.0 million for the six months ended June 30, 2012 compared to 2011 as detailed below:

Component	Change in  interest expense for the six months ended June 30, 2012 compared to June 30, 2011
	(in thousands)
Increases to interest expense due to:
New mortgage/properties placed in-service financings	$	14,918
Issuance by our Operating Partnership of $1.0 billion in aggregate principal of 3.850% senior notes due 2023 on June 11, 2012		2,156
Issuance by our Operating Partnership of $850 million in aggregate principal of 3.700% senior notes due 2018 on November 10, 2011		15,851
Decrease in capitalized interest		1,918
Other interest expense (excluding senior notes) partially offset by principal amortization of continuing debt		137
Total increases to interest expense	$	34,980
Decreases to interest expense due to:
Repayment of mortgage financings	$	(13,240	)
Repurchases/redemption of $576.2 million in aggregate principal of 2.875% exchangeable senior notes due 2037		(7,631	)
Interest expense associated with the adjustment for the equity component allocation of our unsecured exchangeable debt		(4,079	)
Total decreases to interest expense	$	(24,950	)
Total change in interest expense	$	10,030

The following properties are included in the new mortgages/properties placed in-service financings line item: Bay Colony Corporate Center and 601 Lexington Avenue. The following properties are included in the repayment of mortgage financings line item: 601 Lexington Avenue, Reservoir Place, Atlantic Wharf, 510 Madison Avenue, Bay Colony Corporate Center and One Freedom Square. As properties are placed in-service, we cease capitalizing interest and interest is then expensed.

Interest expense directly related to the development of rental properties is not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Interest capitalized for the six months ended June 30, 2012 and 2011 was approximately $21.3 million and $23.2 million, respectively. These costs are not included in the interest expense referenced above.

We anticipate net interest expense for fiscal 2012 will be between $408 million and $412 million. This estimate assumes $40 million to $45 million of capitalized interest, the early redemption of our Operating Partnership’s $225 million unsecured notes due on August 24, 2012 and the repayment of $23.6 million of mortgage indebtedness secured by our Sumner Square project in Washington, DC. This estimate assumes that we will not incur any additional indebtedness, make additional prepayments or repurchase of existing indebtedness, and that there will not be any fluctuations in interest rates or any changes in our development activity.

At June 30, 2012, our variable rate debt consisted of our Operating Partnership’s $750.0 million Unsecured Line of Credit. For a summary of our consolidated debt as of June 30, 2012 and June 30, 2011 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.”

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Discontinued Operations

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

On January 31, 2012, the servicer of the non-recourse mortgage loan collateralized by our Montvale Center property located in Gaithersburg, Maryland foreclosed on the property. During 2011, we had notified the master servicer of the non-recourse mortgage loan that the cash flows generated from the property were insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and that we were not prepared to fund any cash shortfalls. We were not current on making debt service payments and were accruing interest at the default interest rate of 9.93% per annum. The loan was originally scheduled to mature on June 6, 2012. As a result of the foreclosure, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate and working capital to the servicer. We no longer have any equitable or economic ownership interest in the property. The transaction resulted in a gain on forgiveness of debt of approximately $17.8 million. The operating results of the property through the date of foreclosure have been classified as discontinued operations on a historical basis for all periods presented. Refer to Note 3 of the Consolidated Financial Statements for additional details regarding the foreclosure and operating results of the property.

Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships consisted of the outside owner’s equity interest in the income from our 505 9^th Street property.

Noncontrolling Interest-Common Units of the Operating Partnership

Noncontrolling interest-common units of the Operating Partnership increased by approximately $2.1 million for the six months ended June 30, 2012 compared to 2011 due to an increase in allocable income partially offset by a decrease in the noncontrolling interest’s ownership percentage.

Comparison of the three months ended June 30, 2012 to the three months ended June 30, 2011.

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 128 properties totaling approximately 32.6 million net rentable square feet of space, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to April 1, 2011 and owned and in service through June 30, 2012. The Total Property Portfolio includes the effects of the other properties either placed in-service, acquired or in development or redevelopment after April 1, 2011 or disposed of on or prior to June 30, 2012. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the three months ended June 30, 2012 and 2011 with respect to the properties which were placed in-service, acquired or in development or redevelopment.

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	Same Property Portfolio									Properties Acquired Portfolio				Properties Placed In-Service Portfolio					Properties in  Development or Redevelopment Portfolio					Total Property Portfolio
(dollars in thousands)	2012		2011		Increase/ (Decrease)		% Change			2012		2011		2012		2011			2012		2011			2012			2011			Increase/ (Decrease)			% Change
Rental Revenue:
Rental Revenue	$	399,763	$	396,840	$	2,923		0.74	%	$	18,291	$	—	$	31,144	$	16,204		$	—	$	2,602		$	449,198		$	415,646		$	33,552			8.07	%
Termination Income		3,939		222		3,717		1,674.32	%		147		—		—		—			—		—			4,086			222			3,864			1,740.54	%
Total Rental Revenue		403,702		397,062		6,640		1.67	%		18,438		—		31,144		16,204			—		2,602			453,284			415,868			37,416			9.00	%
Real Estate Operating Expenses		141,839		136,525		5,314		3.89	%		7,328		—		12,686		6,190			—		918			161,853			143,633			18,220			12.69	%
Net Operating Income, excluding hotel		261,863		260,537		1,326		0.51	%		11,110		—		18,458		10,014			—		1,684			291,431			272,235			19,196			7.05	%
Hotel Net Operating Income(1)		3,433		2,623		810		30.88	%		—		—		—		—			—		—			3,433			2,623			810			30.88	%
Consolidated Net Operating Income(1)		265,296		263,160		2,136		0.81	%		11,110		—		18,458		10,014			—		1,684			294,864			274,858			20,006			7.28	%
Other Revenue:
Development and management services		—		—		—		—			—		—		—		—			—		—			9,564			9,095			469			5.16	%
Other Expenses:
General and administrative expense		—		—		—		—			—		—		—		—			—		—			19,066			18,721			345			1.84	%
Transaction costs		—		—		—		—			—		—		—		—			—		—			8			1,361			(1,353	)		(99.41	)%
Depreciation and amortization		95,201		94,223		978		1.04	%		7,273		—		9,169		12,399			—		3,637			111,643			110,259			1,384			1.26	%
Total Other Expenses		95,201		94,223		978		1.04	%		7,273		—		9,169		12,399			—		3,637			130,717			130,341			376			0.29	%
Operating Income		170,095		168,937		1,158		0.69	%		3,837		—		9,289		(2,385	)		—		(1,953	)		173,711			153,612			20,099			13.08	%
Other Income:
Income from unconsolidated joint ventures																									21,191			8,882			12,309			138.58	%
Interest and other income																									2,382			1,953			429			21.97	%
Gains (losses) from investments in securities																									(186	)		6			(192	)		(3,200.00	)%
Gains from early extinguishments of debt																									274			—			274			100.00	%
Other Expenses:
Interest expense																									99,901			94,583			5,318			5.62	%
Income from continuing operations																									97,471			69,870			27,601			39.50	%
Discontinued operations:
Income (loss) from discontinued operations																									398			(132	)		530			401.52	%
Gain on sale of real estate from discontinued operations																									36,877			—			36,877			100.00	%
Net income																									134,746			69,738			65,008			93.22	%
Net income attributable to noncontrolling interests:
Noncontrolling interests in property partnerships																									(457	)		(503	)		46			9.15	%
Noncontrolling interest—redeemable preferred units of the Operating Partnership																									(765	)		(842	)		77			9.14	%
Noncontrolling interest—common units of the Operating Partnership																									(10,360	)		(8,194	)		(2,166	)		(26.43	)%
Noncontrolling interest in discontinued operations—common units of the Operating Partnership																									(4,094	)		15			(4,109	)		27,393.33	%
Net Income attributable to Boston Properties, Inc.																								$	119,070		$	60,214		$	58,856			97.74	%

(1) For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 39. Hotel Net Operating Income for the three months ended June 30, 2012 and 2011 are comprised of Hotel Revenue of $10,049 and $8,904 less Hotel Expenses of $6,616 and $6,281, 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 $2.9 million for the three months ended June 30, 2012 compared to 2011. The increase was primarily the result of an increase of approximately $1.9 million in revenue from our leases and an increase in parking and other revenue of approximately $1.5 million, which was mainly due to an increase in transient parking, partially offset by a decrease in other recoveries of approximately $0.5 million. The increase in rental revenue from our leases of approximately $1.9 million is the result of our average revenue increasing by approximately $0.27 per square foot, contributing approximately $1.9 million. No portion of the increase in revenue was related to occupancy as both time periods had an average occupancy of 91.4%.

Termination Income

Termination income increased by approximately $3.7 million for the three months ended June 30, 2012 compared to 2011.

Termination income for the three months ended June 30, 2012 related to seven tenants across the Same Property Portfolio and totaled approximately $3.9 million, of which approximately $3.6 million was from the settlement of a bankruptcy claim against a former tenant that rejected our lease in 2009.

Termination income for the three months ended June 30, 2011 related to two tenants across the Same Property Portfolio and totaled approximately $0.2 million.

Real Estate Operating Expenses

Operating expenses from the Same Property Portfolio increased approximately $5.3 million for the three months ended June 30, 2012 compared to 2011 due primarily to (1) an increase of approximately $2.8 million, or 4.7%, in real estate taxes, which was primarily in our Boston and Washington, DC regions and (2) an increase of approximately $2.5 million in in other operating expenses.

Depreciation and Amortization Expense

Depreciation and amortization expense for the Same Property Portfolio increased approximately $1.0 million for the three months ended June 30, 2012 compared to 2011.

Properties Acquired Portfolio

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

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

On March 13, 2012, we acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash. In connection with the transaction, we entered into a long-term lease with an affiliate of Bank of America for approximately 735,000 square feet. 100 Federal Street is an approximately 1,264,000 net rentable square foot, 37-story Class A office tower.

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Rental Revenue

Rental revenue from our Properties Acquired Portfolio increased approximately $18.4 million for the three months ended June 30, 2012 compared to 2011, as detailed below:

Property	Date Acquired	Rental Revenue for the three months ended June 30,
		2012		2011		Change
		(in thousands)
2440 West El Camino Real	November 22, 2011	$	2,053	$	—	$	2,053
453 Ravendale Drive	March 1, 2012		144		—		144
100 Federal Street	March 13, 2012		16,241		—		16,241
Total		$	18,438	$	—	$	18,438

Real Estate Operating Expenses

Real estate operating expenses from our Properties Acquired Portfolio increased approximately $7.3 million for the three months ended June 30, 2012 compared to 2011, as detailed below:

Property	Date Acquired	Real Estate Operating Expenses for the three months ended June 30,
		2012		2011		Change
		(in thousands)
2440 West El Camino Real	November 22, 2011	$	616	$	—	$	616
453 Ravendale Drive	March 1, 2012		38		—		38
100 Federal Street	March 13, 2012		6,674		—		6,674
Total		$	7,328	$	—	$	7,328

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Acquired Portfolio increased by approximately $7.3 million for the three months ended June 30, 2012 compared to 2011 as a result of the acquisition of properties after June 30, 2011.

Properties Placed In-Service Portfolio

At June 30, 2012, we had six additional properties totaling approximately 2,290,000 square feet that were placed in-service or partially placed in-service between April 1, 2011 and June 30, 2012.

Rental Revenue

Rental revenue from our Properties Placed In-Service Portfolio increased approximately $14.9 million for the three months ended June 30, 2012 compared to 2011, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully  Placed In-Service	Rental Revenue for the three months ended June 30,
			2012		2011		Change
			(in thousands)
2200 Pennsylvania Avenue	First Quarter, 2011	Third Quarter, 2011	$	7,705	$	3,575	$	4,130
Residences on The Avenue	Second Quarter, 2011	Third Quarter, 2011		4,023		576		3,447
The Lofts at Atlantic Wharf	Third Quarter, 2011	Third Quarter, 2011		1,013		—		1,013
Atlantic Wharf—Office	First Quarter, 2011	Fourth Quarter, 2011		12,379		8,095		4,284
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012		4,666		1,260		3,406
One Patriots Park (formerly known as 12310 Sunrise Valley Drive)	Second Quarter, 2012	Second Quarter, 2012		1,358		2,698		(1,340	)
Total			$	31,144	$	16,204	$	14,940

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Real Estate Operating Expenses

Real estate operating expenses from our Properties Placed In-Service Portfolio increased approximately $6.5 million for the three months ended June 30, 2012 compared to 2011, as detailed below:

Property	Quarter Initially Placed In-Service	Quarter Fully  Placed In-Service	Real Estate Operating Expenses for the three months ended June 30,
			2012		2011		Change
			(in thousands)
2200 Pennsylvania Avenue	First Quarter, 2011	Third Quarter, 2011	$	4,641	$	2,247	$	2,394
Residences on The Avenue	Second Quarter, 2011	Third Quarter, 2011		2,207		723		1,484
The Lofts at Atlantic Wharf	Third Quarter, 2011	Third Quarter, 2011		367		—		367
Atlantic Wharf—Office	First Quarter, 2011	Fourth Quarter, 2011		3,598		2,154		1,444
510 Madison Avenue	Second Quarter, 2011	Second Quarter, 2012		1,571		608		963
One Patriots Park (formerly known as 12310 Sunrise Valley Drive)	Second Quarter, 2012	Second Quarter, 2012		302		458		(156	)
Total			$	12,686	$	6,190	$	6,496

Real estate operating expenses for 2200 Pennsylvania Avenue and the Residences on The Avenue include ground rent expense, which includes the non-cash straight-lining of the ground rent expense of approximately $2.8 million and $1.3 million, respectively, for the three months ended June 30, 2012 and $1.2 million and $0.3 million, respectively, for the three months ended June 30, 2011.

Depreciation and Amortization Expense

Depreciation and amortization expense for our Properties Placed In-Service Portfolio decreased by approximately $3.2 million for the three months ended June 30, 2012 compared to 2011. This decrease was due to an approximately $7.8 million decrease in depreciation expense for One Patriots Park as the result of the acceleration of depreciation expense during the three months ended June 30, 2011 in conjunction with the redevelopment of this building partially offset by an approximately $4.6 million increase in depreciation expense at the other buildings that were placed in-service.

Properties in Development or Redevelopment Portfolio

At June 30, 2012 and 2011, the Properties in Development or Redevelopment Portfolio consisted primarily of our 250 West 55th Street development project located in New York City and our Two Patriots Park (formerly known as 12300 Sunrise Valley Drive) property located in Reston, Virginia.

On February 6, 2009, we announced that we were suspending construction on our 989,000 square foot office project at 250 West 55^th Street in New York City. During December 2009, we completed the construction of foundations and steel/deck to grade to facilitate a restart of construction in the future and as a result ceased interest capitalization on the project. During the three months ended June 30, 2011, we recognized approximately $0.4 million of additional costs associated with the suspension and ongoing maintenance of the development project. On May 24, 2011, we signed a lease with the law firm of Morrison & Foerster LLP for approximately 184,000 square feet at 250 West 55^th Street and construction of the project has resumed. As a result of our decision to resume development, in May 2011 we began interest capitalization and are no longer expensing costs associated with this project.

On January 3, 2012, we commenced the redevelopment of our Two Patriots Park property at the complex, which is expected to be completed during the second quarter of 2013. During the three months ended June 30, 2011, this building had revenue, excluding termination income, of approximately $2.6 million and operating

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expenses of approximately $0.4 million. As the building is currently under redevelopment, it did not have any operating results for the three months ended June 30, 2012. In addition, the decrease in depreciation of approximately $3.6 million is the result of the acceleration of depreciation expense during the three months ended June 30, 2011 in conjunction with the redevelopment of this building.

Other Operating Income and Expense Items

Hotel Net Operating Income

Net operating income for the Cambridge Center Marriott hotel property increased by approximately $0.8 million for the three months ended June 30, 2012 compared to 2011.

The following reflects our occupancy and rate information for the Cambridge Center Marriott hotel for the three months ended June 30, 2012 and 2011.

	2012			2011			Percentage Change
Occupancy		85.5	%		85.5	%		—	%
Average daily rate	$	242.69		$	223.11			8.8	%
Revenue per available room, REVPAR	$	207.43		$	190.78			8.7	%

Development and Management Services

Development and management services income increased approximately $0.5 million for the three months ended June 30, 2012 compared to 2011. The increase was primarily due to an increase in development fee income of approximately $1.1 million partially offset by a decrease in management fee income of approximately $0.6 million. The increase in development fees is primarily due to an increase in fees associated with tenant improvement project management partially offset by a decrease in the development fees related to 75 Ames Street in Cambridge, Massachusetts as a result of us recognizing in 2011 approximately $1.5 million of fees related to us achieving certain approval milestones that did not recur in 2012. The decrease in management fees is due to a decrease in leasing fees earned from our joint venture properties.

General and Administrative

General and administrative expenses increased approximately $0.3 million for the three months ended June 30, 2012 compared to 2011. The increase was due to minor increases in overall general and administrative expenses.

Wages directly related to the development of rental properties are not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Capitalized wages for the three months ended June 30, 2012 and 2011 were approximately $3.3 million and $2.9 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

During the three months ended June 30, 2012 and 2011, we incurred approximately $8,000 and $1.4 million, respectively of transaction pursuit costs.

Other Income and Expense Items

Income from Unconsolidated Joint Ventures

For the three months ended June 30, 2012 compared to 2011, income from unconsolidated joint ventures increased by approximately $12.3 million. On May 14, 2012, an unconsolidated joint venture in which we have a

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60% interest entered into a lease termination agreement with an existing tenant at its General Motors Building in New York City. Under the agreement, the tenant terminated early its lease for approximately 36,000 square feet at the building and is responsible for certain payments to the unconsolidated joint venture aggregating approximately $28.4 million through May 1, 2014 (of which our share is approximately $17.0 million). As a result of the termination, we recognized termination income totaling approximately $11.8 million (which is net of the write-off of the accrued straight-line rent balance) during the second quarter of 2012. In addition, our other unconsolidated joint ventures contributed approximately $0.5 million of the increase.

Interest and Other Income

Interest and other income increased approximately $0.4 million for the three months ended June 30, 2012 compared to 2011. During the three months ended June 30, 2012 compared to 2011, interest income increased by approximately $0.1 million.

During the three months ended June 30, 2012 compared to 2011, other income increased by approximately $0.3 million of which $1.1 million was related to an insurance claim that we received during 2012. On June 6, 2006, we sold 280 Park Avenue in New York City. In connection with the sale, in lieu of a closing adjustment in favor of the buyer for certain unfunded tenant improvements, we retained the obligation to pay for the improvements, subject to the tenant initiating the request for reimbursement. The total amount of unfunded tenant improvements at closing was approximately $1.0 million and has yet to be requested by the tenants. During the three months ended June 30, 2011, a tenant’s lease expired for which we had unfunded tenant improvement liabilities of approximately $0.8 million, resulting in the recognition of other income in that amount.

Gains (losses) from Investments in Securities

Gains (losses) from investments in securities for the three months ended June 30, 2012 and 2011 related to investments that we have made to reduce our market risk relating to a deferred compensation plan that we maintain for our officers. Under this deferred compensation plan, each officer who is eligible to participate is permitted to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. In order to reduce our market risk relating to this plan, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer. This enables us to generally match our liabilities to our officers under the deferred compensation plan with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains (losses) from investments in securities. During the three months ended June 30, 2012 and 2011, we recognized gains (losses) of approximately $(0.2) million and $6,000, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $(0.3) million and $23,000 during the three months ended June 30, 2012 and 2011, respectively, as a result of increases (decreases) in our liability under our deferred compensation plan that were associated with the performance of the specific investments selected by our officers participating in the plan.

Gains from Early Extinguishments of Debt

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

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Interest Expense

Interest expense for the Total Property Portfolio increased approximately $5.3 million for the three months ended June 30, 2012 compared to 2011 as detailed below:

Component	Change in  interest expense for the three months ended June 30, 2012 compared to June 30, 2011
	(in thousands)
Increases to interest expense due to:
New mortgage/properties placed in-service financings	$	8,690
Issuance by our Operating Partnership of $1.0 million in aggregate principal of 3.850% senior notes due 2023 on June 11, 2012		2,156
Issuance by our Operating Partnership of $850 million in aggregate principal of 3.700% senior notes due 2018 on November 10, 2011		7,925
Decrease in capitalized interest		1,881
Total increases to interest expense	$	20,652
Decreases to interest expense due to:
Repayment of mortgage financings	$	(6,830	)
Repurchases/redemption of $576.2 million in aggregate principal of 2.875% exchangeable senior notes due 2037		(5,345	)
Interest expense associated with the adjustment for the equity component allocation of our unsecured exchangeable debt		(2,838	)
Principal amortization of continuing debt and other (excluding senior notes)		(321	)
Total decreases to interest expense	$	(15,334	)
Total change in interest expense	$	5,318

The following properties are included in the new mortgages/properties placed in-service financings line item: 601 Lexington Avenue. The following properties are included in the repayment of mortgage financings line item: 601 Lexington Avenue, Reservoir Place, Atlantic Wharf, 510 Madison Avenue, Bay Colony Corporate Center and One Freedom Square. As properties are placed in-service, we cease capitalizing interest and interest is then expensed.

Interest expense directly related to the development of rental properties is not included in our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate. Interest capitalized for the three months ended June 30, 2012 and 2011 was approximately $10.1 million and $12.0 million, respectively. These costs are not included in the interest expense referenced above.

At June 30, 2012, our variable rate debt consisted of our Operating Partnership’s $750.0 million Unsecured Line of Credit. For a summary of our consolidated debt as of June 30, 2012 and June 30, 2011 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 May 17, 2012, we completed the sale of our Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash. Net cash proceeds totaled approximately $62.0 million, resulting in a gain on sale of approximately $36.9 million. Bedford Business Park is comprised of two Office/Technical buildings and one Class A office building aggregating approximately 470,000 net rentable square feet.

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The operating results of the property through the date of sale have been classified as discontinued operations on a historical basis for all periods presented. Refer to Note 3 of the Consolidated Financial Statements for additional details regarding the sale and operating results.

On January 31, 2012, the servicer of the non-recourse mortgage loan collateralized by our Montvale Center property located in Gaithersburg, Maryland foreclosed on the property. During 2011, we had notified the master servicer of the non-recourse mortgage loan that the cash flows generated from the property were insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and that we were not prepared to fund any cash shortfalls. We were not current on making debt service payments and were accruing interest at the default interest rate of 9.93% per annum. The loan was originally scheduled to mature on June 6, 2012. As a result of the foreclosure, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate and working capital to the servicer. We no longer have any equitable or economic ownership interest in the property. The operating results of the property through the date of foreclosure have been classified as discontinued operations on a historical basis for all periods presented. Refer to Note 3 of the Consolidated Financial Statements for additional details regarding the foreclosure and operating results of the property.

Noncontrolling interests in property partnerships

Noncontrolling interests in property partnerships consisted of the outside owner’s equity interest in the income from our 505 9^th Street property.

Noncontrolling Interest-Common Units of the Operating Partnership

Noncontrolling interest-common units of the Operating Partnership increased by approximately $2.2 million for the six months ended June 30, 2012 compared to 2011 due to an increase in allocable income partially offset by a decrease in the noncontrolling interest’s ownership percentage.

Liquidity and Capital Resources

General

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

• fund normal recurring expenses;

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

• redeem on August 24, 2012 the $225 million aggregate principal amount of 6.25% senior notes due 2013 for which our Operating Partnership issued notice to redeem on July 25, 2012 (see Note 14 to the Consolidated Financial Statements);

• redeem or meet repurchase obligations that may be elected in May 2013 by our Operating Partnership or holders, respectively, with respect to our Operating Partnership’s 3.750% exchangeable senior notes due 2036;

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

• fund development costs;

• fund possible property acquisitions; and

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

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

• cash flow from operations;

• distribution of cash flows from joint ventures;

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• cash and cash equivalent balances;

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

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

• construction loans;

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

• sales of real estate.

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

The following table presents information on properties under construction as of June 30, 2012 (dollars in thousands):

Construction Properties	Estimated Stabilization Date	Location	# of Buildings		Square feet		Investment to Date(1)		Estimated  Total Investment(1)		Percentage Leased(2)
Office
Annapolis Junction Building Six (50% ownership)(3)	Third Quarter, 2013	Annapolis, MD		1		120,000	$	11,475	$	14,000		49	%
500 North Capitol Street, NW (30% ownership)(3)	Fourth Quarter, 2013	Washington, DC		1		232,000		25,031		36,540		75	%
Two Patriots Park (formerly known as 12300 Sunrise Valley Drive)(4)	Second Quarter, 2013	Reston, VA		1		255,951		28,936		64,000		100	%
Seventeen Cambridge Center	Third Quarter, 2013	Cambridge, MA		1		195,191		33,942		86,300		100	%
Cambridge Center Connector(5)	Third Quarter, 2013	Cambridge, MA		—		42,500		924		28,765		100	%
250 West 55th Street(6)	Fourth Quarter, 2015	New York, NY		1		989,000		644,282		1,050,000		21	%
Total Office Properties under Construction				5		1,834,642	$	744,590	$	1,279,605		51	%
Residential
The Avant at Reston Town Center	Fourth Quarter, 2015	Reston, VA		1		355,668	$	35,446	$	137,250		N/A
Total Properties under Construction				6		2,190,310	$	780,036	$	1,416,855		51	%

(1) Represents our share. Includes net revenue during lease up period, acquisition expenses and approximately $56.3 million of construction cost and leasing commission accruals.

(2) Represents percentage leased as of August 2, 2012 and excludes residential space.

(3) This development project has a construction loan.

(4) Project costs include the incremental costs related to redevelopment and excludes original investment in the asset.

(5) This project is part of a lease expansion and extension for a tenant at Cambridge Center.

(6) Investment to Date excludes approximately $24.8 million of costs that were expensed in prior periods in connection with the suspension of development activities. Estimated Total Investment includes approximately $230 million of interest capitalization.

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

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maintaining quality standards for our properties that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling operating expenses. Our sources of revenue also include third-party fees generated by our property management, leasing, and development and construction businesses, as well as the sale of assets from time to time. We believe our revenue, together with our cash balances and proceeds from financing activities, will continue to provide the necessary funds for our short-term liquidity needs.

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

Since January 1, 2012, we issued an aggregate of 2,347,500 shares of our common stock under our ATM program for gross proceeds of approximately $249.8 million and net proceeds of approximately $247.2 million. As of August 6, 2012, we have approximately $305.3 million remaining under this ATM program. We intend to use the net proceeds from the sales for general business purposes, which may include investment opportunities and debt reduction. Pending such uses, we may invest the net proceeds in short-term, interest-bearing securities.

Since January 1, 2012, we repurchased and redeemed the remaining $576.2 million of our Operating Partnership’s 2.875% exchangeable senior notes due 2037. In addition, we repaid an aggregate of $209.0 million of secured debt. After completing these transactions, we have satisfied all of our 2012 debt maturities. In anticipation of funding our capital commitments from development and repayment of debt through 2013 our Operating Partnership issued $1.0 billion of senior unsecured notes due 2023 at an effective yield of 3.954%. On July 25, 2012, our Operating Partnership issued notice to redeem the remaining $225 million of 6.25% senior notes due 2013 on August 24, 2012 and we notified the lender of our intention to repay in the third quarter 2012 our approximately $23 million mortgage loan secured by our Sumner Square property located in Washington, DC, which is scheduled to mature on September 1, 2013. After these repayments we have secured and unsecured debt maturities in 2013 aggregating approximately $645 million, of which our share is approximately $591 million, which will need to be redeemed, repaid or refinanced. The completion of our ongoing development through late 2015 has remaining costs to fund of $639 million and is expected to be fully funded by cash and available draws from construction loans. We believe that our strong liquidity, including available cash as of August 2, 2012 of approximately $1.5 billion, and the approximately $740 million available under our Operating Partnership’s Unsecured Line of Credit, 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 attractive additional investment opportunities. Given the relatively low interest rates currently available to us in the debt markets, we may seek to enhance our liquidity in the future, which may result in us carrying additional cash and cash equivalents pending our Operating Partnership’s use of the proceeds. In order to reduce future cash interest payments, as well as future amounts due at maturity or upon redemption, we may, from time to time, purchase unsecured senior notes and unsecured exchangeable senior notes for cash in open market purchases or privately negotiated transactions, or both. We will evaluate any such potential transactions in light of then-existing market conditions, taking into account the trading prices of the notes, our current liquidity and prospects for future access to capital.

REIT Tax Distribution Considerations

Dividend

As a REIT we are subject to a number of organizational and operational requirements, including a requirement that we currently distribute at least 90% of our annual taxable income. Our policy is to distribute at least 100% of our taxable income to avoid paying federal tax. In December 2011, our Board of Directors increased our quarterly dividend from $0.50 per common share to $0.55 per common share. Our Board of

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Directors will continue to evaluate this current dividend rate in light of our actual and projected taxable income, liquidity requirements and other circumstances, and there can be no assurance that the future dividends declared by our Board of Directors will not differ materially.

Sales

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

Cash Flow Summary

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

Cash and cash equivalents were approximately $1.7 billion and $0.8 billion at June 30, 2012 and 2011, respectively, representing an increase of approximately $0.9 billion. The following table sets forth changes in cash flows:

	Six months ended June 30,
	2012			2011			Increase (Decrease)
	(in thousands)
Net cash provided by operating activities	$	331,080		$	290,101		$	40,979
Net cash used in investing activities		(806,414	)		(190,106	)		(616,308	)
Net cash provided by financing activities		324,123			201,641			122,482

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 7.1 years with occupancy rates historically in the range of 91% to 94%. Our properties generate a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service and fund quarterly dividend and distribution payment requirements. In addition, over the past several years, we have raised capital through the sale of some of our properties, secured and unsecured borrowings and equity offerings.

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

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months ended June 30, 2012 and 2011 consisted primarily of funding our development projects and the acquisition of Bay Colony Corporate Center and 100 Federal Street, as detailed below:

	Six months ended June 30,
	2012			2011
	(in thousands)
Acquisitions of real estate	$	(621,359	)	$	(41,100	)
Construction in progress		(152,548	)		(137,258	)
Building and other capital improvements		(21,569	)		(13,390	)
Tenant improvements		(72,786	)		(28,290	)
Proceeds from the sale of real estate		61,963			—
Proceeds from land transaction		—			43,887
Deposit on real estate released from escrow		—			10,000
Issuance of notes receivable		(1,974	)		(6,375	)
Capital contributions to unconsolidated joint ventures		(325	)		(16,716	)
Capital distributions from unconsolidated joint ventures		3,057			—
Investments in securities, net		(873	)		(864	)
Net cash used in investing activities	$	(806,414	)	$	(190,106	)

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

• On February 1, 2011, we completed the acquisition of Bay Colony Corporate Center in Waltham, Massachusetts for an aggregate purchase price of approximately $185.0 million. The purchase price consisted of approximately $41.1 million of cash and the assumption of approximately $143.9 million of indebtedness. In connection with this transaction, we deposited $10.0 million in escrow, which was returned to us at closing.

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

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

• Construction in progress for the six months ended June 30, 2011 includes ongoing expenditures associated with our Atlantic Wharf Office, 2200 Pennsylvania Avenue, the Residences on The Avenue and 510 Madison Avenue developments, which were partially placed in-service during the six months ended June 30, 2011. In addition, for the six months ended June 30, 2011, we also incurred costs associated with the continued development of The Lofts at Atlantic Wharf and 250 West 55th Street. Construction in progress for the six months ended June 30, 2012 includes expenditures associated with our 510 Madison Avenue and One Patriots Park developments, which were fully placed in-service during the six months ended June 30, 2012. In addition, we incurred costs associated with the continued development and redevelopment of Two Patriots Park, Seventeen Cambridge Center, The Avant at Reston Town Center, the Cambridge Center Connector and 250 West 55th Street. The completion of our ongoing developments, including our share of our unconsolidated joint venture developments, through 2015 is expected to be fully funded by cash and available draws from construction loans. We estimate our future funding requirement to complete our developments, which includes our share of our unconsolidated joint venture developments, to be approximately $639 million.

• Tenant improvement costs increased by approximately $44.5 million due to the start of large tenant projects in 2012.

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

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• Proceeds from land transaction relates to the portion of the payment received by us for our 75 Ames Street land parcel from a third-party which we estimate will relate to the ultimate conveyance of a condominium interest to the third-party upon the anticipated completion of the development of the property and does not include the portion attributable to rental of the land during the period of development.

Cash provided by financing activities for the six months ended June 30, 2012 totaled approximately $324.1 million. This consisted primarily of the issuance of $1.0 billion of our Operating Partnership’s 3.850% senior notes due 2023 and the net proceeds from the issuance of shares of our common stock under our ATM stock offering program, partially offset by the repurchase / redemption of all of our Operating Partnership’s outstanding 2.875% exchangeable senior notes due 2037, the payments of dividends and distributions to our shareholders and the unitholders of our Operating Partnership and the repayment of mortgage notes payable. Future debt payments are discussed below under the heading “Capitalization-Debt Financing.”

Capitalization

At June 30, 2012, our total consolidated debt was approximately $8.9 billion. The GAAP weighted-average annual interest rate on our consolidated indebtedness was 5.22% (with a coupon/stated rate of 4.90%) and the weighted-average maturity was approximately 6.1 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 $27.3 billion at June 30, 2012. Total consolidated market capitalization was calculated using the June 30, 2012 closing stock price of $108.37 per common share and the following: (1) 150,715,702 shares of our common stock, (2) 16,514,469 outstanding common units of partnership interest in Boston Properties Limited Partnership (excluding common units held by Boston Properties, Inc.), (3) an aggregate of 1,352,688 common units issuable upon conversion of all outstanding Series Two Preferred Units of partnership interest in Boston Properties Limited Partnership, (4) an aggregate of 1,683,214 common units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, and (5) our consolidated debt totaling approximately $8.9 billion. The calculation of total consolidated market capitalization does not include 400,000 2011 OPP Units and 400,000 2012 OPP Units because, unlike other LTIP Units, they are not earned until certain return thresholds are achieved. Our total consolidated debt, which excludes debt collateralized by our unconsolidated joint ventures, at June 30, 2012, represented approximately 32.53% of our total consolidated market capitalization. This percentage 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 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.”

Debt Financing

As of June 30, 2012, we had approximately $8.9 billion of outstanding consolidated indebtedness, representing approximately 32.53% of our total consolidated market capitalization as calculated above consisting of approximately (1) $4.863 billion (net of discount) in publicly traded unsecured senior notes (excluding exchangeable senior notes) having a weighted-average interest rate of 4.82% per annum and maturities in 2013, 2015, 2018, 2019, 2020, 2021 and 2023; (2) $441.6 million (net of adjustment for the equity component

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allocation) of exchangeable senior notes having a GAAP interest rate of 5.958% per annum (an effective rate of 3.787% per annum, excluding the effect of the adjustment for the equity component allocation), an initial optional redemption date in 2013 and maturity in 2036; (3) $714.1 million (net of discount and the adjustment for the equity component allocation ) of exchangeable senior notes having a GAAP interest rate of 6.555% per annum (an effective rate of 4.037%, excluding the effect of the adjustment for the equity component allocation) and maturing in 2014; and (4) $2.9 billion of property-specific mortgage debt having a GAAP weighted-average interest rate of 5.47% per annum and weighted-average term of 5.8 years. On July 25, 2012, our Operating Partnership issued notice to redeem the remaining $225 million aggregate principal amount of our Operating Partnership’s 6.25% senior notes due 2013 on August 24, 2012. The table below summarizes our mortgage notes payable, our unsecured senior notes and our Unsecured Line of Credit at June 30, 2012 and June 30, 2011:

	2012			2011
	(Dollars in Thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable	$	2,877,125		$	2,410,663
Variable rate mortgage notes payable		—			770,806	(1)
Unsecured senior notes, net of discount		4,863,413			3,016,837
Unsecured exchangeable senior notes, net of discount and adjustment for the equity component allocation		1,155,669			1,743,337
Unsecured Line of Credit		—			—
Total	$	8,896,207		$	7,941,643
Percent of total debt:
Fixed rate		100.00	%		90.29	%
Variable rate		—	%		9.71	%
Total		100.00	%		100.00	%
GAAP Weighted-average interest rate at end of period:
Fixed rate		5.22	%		5.63	%
Variable rate		—	%		1.60	%
Total		5.22	%		5.24	%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate		4.90	%		5.16	%
Variable rate		—	%		0.77	%
Total		4.90	%		4.73	%

(1) On May 11, 2011, we refinanced at maturity the mortgage loan collateralized by our 601 Lexington Avenue property located in New York City totaling approximately $453.3 million utilizing the proceeds of a draw under our Operating Partnership’s Unsecured Line of Credit, which borrowing was secured by a mortgage on the property and this amount is included in Variable rate mortgage notes payable. On August 19, 2011, we obtained mortgage financing totaling $725.0 million collateralized by our 601 Lexington Avenue property. Proceeds from the mortgage financing were used to repay the borrowing under our Operating Partnership’s Unsecured Line of Credit.

Unsecured Line of Credit

On June 24, 2011, our Operating Partnership amended and restated the revolving credit agreement governing our Operating Partnership’s Unsecured Line of Credit, which (1) reduced the total commitment from $1.0 billion to $750.0 million, (2) extended the maturity date from August 3, 2011 to June 24, 2014, with a provision for a one-year extension at the Operating Partnership’s option, subject to certain conditions and the payment of an extension fee equal to 0.20% of the total commitment then in effect, and (3) increased the per

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annum variable interest rates available, which resulted in an increase of the per annum variable interest rate on outstanding balances from Eurodollar plus 0.475% per annum to Eurodollar plus 1.225% per annum. Under the amended Unsecured Line of Credit, the Operating Partnership may increase the total commitment to $1.0 billion, subject to syndication of the increase. In addition, a facility fee currently equal to an aggregate of 0.225% per annum of the total commitment is payable in equal quarterly installments. The interest rate and facility fee are subject to adjustment in the event of a change in the Operating Partnership’s unsecured debt ratings. The amended Unsecured Line of Credit also contains a competitive bid option that allows banks that are part of the lender consortium to bid to make loan advances to the Operating Partnership at a reduced interest rate. Our ability to borrow under our 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;

• a minimum net worth requirement of $3.5 billion;

• 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 June 30, 2012, we had no borrowings and outstanding letters of credit totaling approximately $13.1 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $736.9 million. As of August 2, 2012, we had no borrowings and outstanding letters of credit totaling approximately $9.6 million outstanding under the Unsecured Line of Credit, with the ability to borrow approximately $740.4 million.

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Principal Amount			Maturity Date(2)
10 Year Unsecured Senior Notes		6.250	%		6.381	%	$	182,432		January 15, 2013(3)
10 Year Unsecured Senior Notes		6.250	%		6.291	%		42,568		January 15, 2013(3)
12 Year Unsecured Senior Notes		5.625	%		5.693	%		300,000		April 15, 2015
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000		June 1, 2015
10 Year Unsecured Senior Notes		5.875	%		5.967	%		700,000		October 15, 2019
10 Year Unsecured Senior Notes		5.625	%		5.708	%		700,000		November 15, 2020
10 Year Unsecured Senior Notes		4.125	%		4.289	%		850,000		May 15, 2021
7 Year Unsecured Senior Notes		3.700	%		3.853	%		850,000		November 15, 2018
11 Year Unsecured Senior Notes		3.850	%		3.954	%		1,000,000		February 1, 2023
Total principal								4,875,000
Net unamortized discount								(11,587	)
Total							$	4,863,413

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(1) Yield on issuance date including the effects of discounts on the notes.

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

(3) On July 25, 2012, our Operating Partnership issued notice to redeem the remaining $225 million aggregate principal amount of our Operating Partnership’s 6.25% senior notes due 2013 on August 24, 2012.

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 25 basis points in the case of the $250 million of notes that mature on June 1, 2015, 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 1.5, and (4) unencumbered asset value to be no less than 150% of our unsecured debt. As of June 30, 2012, we believe we were in compliance with each of these financial restrictions and requirements.

On June 11, 2012, our Operating Partnership completed a public offering of $1.0 billion in aggregate principal amount of its 3.850% senior unsecured notes due 2023. The notes were priced at 99.779% of the principal amount to yield an effective rate (including financing fees) of 3.954% to maturity. The notes will mature on February 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $989.4 million after deducting underwriting discounts and transaction expenses.

Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Exchange Rate			Principal Amount			First Optional Redemption  Date by Company	Maturity Date
3.625% Exchangeable Senior Notes		3.625	%		4.037	%		8.5051	(2)	$	747,500		N/A	February 15, 2014
3.750% Exchangeable Senior Notes		3.750	%		3.787	%		10.0066	(3)		450,000		May 18, 2013(4)	May 15, 2036
Total principal											1,197,500
Net unamortized discount											(2,368	)
Adjustment for the equity component allocation, net of accumulated amortization											(39,463	)
Total										$	1,155,669

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

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of our common stock). In addition, we entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were expected to have the effect of

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increasing the effective exchange price to us of the notes from $117.58 to approximately $137.17 per share (subject to adjustment), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of our common stock. The net cost of the capped call transactions was approximately $44.4 million. As of June 30, 2012, the effective exchange price was $134.94 per share.

(3) In connection with the special dividend of $5.98 per share of common stock declared on December 17, 2007, the exchange rate was adjusted from 9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately $99.93 per share of our common stock.

(4) Holders may require our Operating Partnership to repurchase the notes for cash on May 18, 2013 and on May 15 of 2016, 2021, 2026 and 2031 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to 100% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date.

Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at June 30, 2012:

Properties	Stated Interest  Rate			GAAP Interest  Rate(1)			Stated Principal Amount		Historical Fair Value Adjustment		Carrying Amount			Maturity Date
	(Dollars in thousands)
599 Lexington Avenue		5.57	%		5.41	%	$	750,000	$	—	$	750,000	(2)(3)	March 1, 2017
601 Lexington Avenue		4.75	%		4.79	%		725,000		—		725,000		April 10, 2022
John Hancock Tower		5.68	%		5.05	%		640,500		17,824		658,324	(1)(3)	January 6, 2017
Embarcadero Center Four		6.10	%		7.02	%		367,714		—		367,714	(4)	December 1, 2016
505 9th Street		5.73	%		5.87	%		124,770		—		124,770	(5)	November 1, 2017
New Dominion Tech Park, Bldg. Two		5.55	%		5.58	%		63,000		—		63,000	(3)	October 1, 2014
140 Kendrick Street		7.51	%		5.25	%		48,471		867		49,338	(1)	July 1, 2013
New Dominion Tech Park, Bldg. One		7.69	%		7.84	%		46,430		—		46,430		January 15, 2021
Kingstowne Two and Retail		5.99	%		5.61	%		35,622		478		36,100	(1)	January 1, 2016
Sumner Square		7.35	%		7.54	%		23,370		—		23,370		September 1, 2013
Kingstowne One		5.96	%		5.68	%		17,394		64		17,458	(1)	May 5, 2013
University Place		6.94	%		6.99	%		15,621		—		15,621		August 1, 2021
Total							$	2,857,892	$	19,233	$	2,877,125

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

(2) 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.

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

(4) On November 13, 2008, we closed on an eight-year, $375.0 million mortgage loan collateralized by this property. The mortgage loan bears interest at a fixed rate of 6.10% per annum. Under our interest rate hedging program, we are reclassifying into earnings over the eight-year term of the loan as an increase in

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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.

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

Off-Balance Sheet Arrangements—Joint Venture Indebtedness

We have investments in twelve unconsolidated joint ventures (including our investment in the Value-Added Fund) with our effective ownership interests ranging from 25% to 60%. Nine 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 June 30, 2012, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $3.0 billion (of which our proportionate share is approximately $1.4 billion). The table below summarizes the outstanding debt of these joint venture properties at June 30, 2012. In addition to other guarantees specifically noted in the table, we have agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) on certain of the loans.

Properties	Venture Ownership %			Stated Interest Rate			GAAP Interest Rate(1)			Stated Principal Amount		Historical Fair  Value Adjustment			Carrying Amount			Maturity Date
	(Dollars in thousands)
General Motors Building:
Secured 1st Mortgage		60	%		5.95	%		6.50	%	$	1,300,000	$	(35,872	)	$	1,264,128	(1)(2)(3)	October 7, 2017
Mezzanine Loan		60	%		6.02	%		8.00	%		306,000		(29,340	)		276,660	(1)(2)(4)	October 7, 2017
Partner Loans		60	%		11.00	%		11.00	%		450,000		—			450,000	(5)	June 9, 2017
125 West 55th Street		60	%		6.09	%		6.15	%		201,386		—			201,386		March 10, 2020
540 Madison Avenue		60	%		5.20	%		6.75	%		118,400		(1,792	)		116,608	(1)(6)	July 11, 2013
Metropolitan Square		51	%		5.75	%		5.81	%		175,000		—			175,000		May 5, 2020
Market Square North		50	%		4.85	%		4.91	%		130,000		—			130,000		October 1, 2020
Annapolis Junction		50	%		1.99	%		2.15	%		42,110		—			42,110	(7)	March 31, 2018
Annapolis Junction Building Six		50	%		1.89	%		2.56	%		12,297		—			12,297	(2)(8)	November 17, 2013
Mountain View Tech. Park:
Secured 1st Mortgage		39.5	%		2.75	%		3.33	%		20,000		—			20,000	(2)(9)(10)	November 22, 2014
BPLP loan		39.5	%		10.00	%		10.00	%		4,018		—			4,018	(2)(11)	November 22, 2014
Mountain View Research Park:
Secured 1st Mortgage		39.5	%		2.24	%		2.44	%		90,933		—			90,933	(9)(12)	May 31, 2014
BPLP loan		39.5	%		10.00	%		10.00	%		7,995					7,995	(2)(13)	May 31, 2014
500 North Capitol Street		30	%		1.89	%		2.57	%		61,103		—			61,103	(2)(14)	October 14, 2014
901 New York Avenue		25	%		5.19	%		5.27	%		158,283		—			158,283		January 1, 2015
300 Billerica Road:
Secured 1st Mortgage		25	%		5.69	%		6.04	%		7,500		—			7,500	(2)(9)	January 1, 2016
BPLP Loan		25	%		10.00	%		10.00	%		402					402	(15)	December 15, 2012
Total										$	3,085,427	$	(67,004	)	$	3,018,423

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

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

(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 June 30, 2012, the maximum funding obligation under the guarantee was approximately $20.2 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) Principal amount does not include the assumed mezzanine loan with an aggregate principal amount of $294.0 million and a stated rate of 6.02% per annum, as the venture acquired the lenders’ interest in this loan for a purchase price of approximately $263.1 million in cash.

(5) In connection with the capitalization of the joint venture, loans totaling $450.0 million were funded by the venture’s partners on a pro-rata basis. Our share of the partner loans totaling $270.0 million has been reflected in Related Party Note Receivable on our Consolidated Balance Sheets.

(6) In connection with the assumption of the loan, we guaranteed the joint venture’s obligation to fund tenant improvements and leasing commissions.

(7) 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.

(8) The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on November 17, 2013 with two, one-year extension options, subject to certain conditions.

(9) This property is owned by the Value-Added Fund.

(10) The mortgage loan bears interest at a variable rate equal to LIBOR plus 2.50% per annum.

(11) In conjunction with the mortgage loan modification our Operating Partnership agreed to lend up to $6.0 million to the Value-Added Fund, of which approximately $4.0 million had been advanced as of June 30, 2012. The loan from our Operating Partnership bears interest at a fixed rate of 10.0% per annum and matures on November 22, 2014. This loan has been reflected in Related Party Notes Receivable on our Consolidated Balance Sheets.

(12) The mortgage loan bears interest at a variable rate equal to LIBOR plus 2.00% per annum.

(13) In conjunction with the mortgage loan modification, our Operating Partnership agreed to lend up to $12.0 million to our Value-Added Fund, of which approximately $8.0 million has been advanced as of June 30, 2012. The loan from our Operating Partnership bears interest at a fixed rate of 10.0% per annum and matures on May 31, 2014. This loan has been reflected in Related Party Notes Receivable on our Consolidated Balance Sheets.

(14) The construction financing bears interest at a variable rate equal to LIBOR plus 1.65% per annum and matures on October 14, 2014 with two, one-year extension options, subject to certain conditions.

(15) On June 6, 2012, our Operating Partnership agreed to lend up to $2.3 million to our Value-Added Fund, of which approximately $0.4 million has been advanced as of June 30, 2012. The loan from our Operating Partnership bears interest at a fixed rate of 10.0% per annum and matures on December 15, 2012. This loan has been reflected in Related Party Notes Receivable on our Consolidated Balance Sheets.

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.

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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”). Currently, the per occurrence limits of our portfolio property insurance program are $1.0 billion, including coverage for acts of terrorism certified under TRIA other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). We also carry $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billion of Terrorism Coverage in our property insurance program which is provided by IXP, LLC (“IXP”) as a direct insurer. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage, with $1.375 billion of Terrorism Coverage in excess of $250 million being provided by NYXP, LLC, (“NYXP”) as a direct insurer. We also currently carry nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIA (“NBCR Coverage”), which is provided by IXP, as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding the properties owned by our Value-Added Fund and certain other properties owned in joint ventures with third parties or which we manage. The per occurrence limit for NBCR Coverage is $1 billion. Under TRIA, after the payment of the required deductible and coinsurance, the additional Terrorism Coverage provided by IXP for 601 Lexington Avenue, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $100 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. We may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in our portfolio or for any other reason. We intend to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.

We also currently carry earthquake insurance on our properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that we believe are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically, we currently carry earthquake insurance which covers our San Francisco region 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 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 on some or all of our properties in the future if the premiums exceed our estimation of the value of the coverage.

IXP, a captive insurance company which is a wholly-owned subsidiary, acts as a direct insurer with respect to a portion of our earthquake insurance coverage for our Greater San Francisco properties, the additional Terrorism Coverage for 601 Lexington Avenue and our NBCR Coverage. The additional Terrorism Coverage provided by IXP for 601 Lexington Avenue only applies to losses which exceed the program trigger under TRIA. NYXP, a captive insurance company which is a wholly-owned subsidiary, acts as a direct insurer with respect to a portion of our Terrorism Coverage for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program trigger under TRIA and NYXP reinsures with a third-party insurance company any coinsurance payable under TRIA. Insofar as we own IXP and NYXP, we are responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of our consolidated financial statements. In particular, if a

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loss occurs which is covered by our NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If we experience a loss and IXP or NYXP are required to pay under their insurance policies, we would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, our Operating Partnership has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

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

We continue to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but we cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars or the presence of mold at our properties, 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. (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

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

The following table presents a reconciliation of net income attributable to Boston Properties, Inc. to FFO for the three months ended June 30, 2012 and 2011:

	Three months ended June 30,
	2012			2011
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	119,070		$	60,214
Add:
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		4,094			(15	)
Noncontrolling interest—common units of the Operating Partnership		10,360			8,194
Noncontrolling interest—redeemable preferred units of the Operating Partnership		765			842
Noncontrolling interests in property partnerships		457			503
Less:
Income (loss) from discontinued operations		398			(132	)
Gain on sale of real estate from discontinued operations		36,877			—
Income from continuing operations		97,471			69,870
Add:
Real estate depreciation and amortization(1)		135,030			137,495
Income (loss) from discontinued operations		398			(132	)
Less:
Noncontrolling interests in property partnerships’ share of funds from operations		956			966
Noncontrolling interest—redeemable preferred units of the Operating Partnership		765			842
Funds from operations attributable to the Operating Partnership	$	231,178		$	205,425
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations		24,361			23,856
Funds from Operations attributable to Boston Properties, Inc.	$	206,817		$	181,569
Boston Properties, Inc.’s percentage share of Funds from Operations—basic		89.46	%		88.39	%
Weighted-average shares outstanding—basic		150,312			145,864

(1) Real estate depreciation and amortization consists of depreciation and amortization from the Consolidated Statements of Operations of $111,643 and $110,259, our share of unconsolidated joint venture real estate depreciation and amortization of $23,513 and $26,680 and depreciation and amortization from discontinued operations of $243 and $821, less corporate related depreciation and amortization of $369 and $265 for the three months ended June 30, 2012 and 2011, respectively.

71

Reconciliation to Diluted Funds from Operations:

	Three Months Ended June 30, 2012				Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Income (Numerator)		Shares (Denominator)
	(in thousands)				(in thousands)
Basic FFO	$	231,178		168,018	$	205,425		165,029
Effect of Dilutive Securities
Convertible Preferred Units		765		1,353		842		1,461
Stock Based Compensation and Exchangeable Notes		—		382		—		831
Diluted FFO	$	231,943		169,753	$	206,267		167,321
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted FFO		24,192		17,706		23,625		19,165
Boston Properties, Inc.’s share of Diluted FFO(1)	$	207,751		152,047	$	182,642		148,156

(1) Our share of diluted Funds from Operations was 89.57% and 88.55% for the quarter ended June 30, 2012 and 2011, respectively.

Contractual Obligations

We have various standing or renewable service contracts with vendors related to our property management. In addition, we have certain other utility contracts we enter into in the ordinary course of business which may extend beyond one year, which vary based on usage. These contracts include terms that provide for cancellation with insignificant or no cancellation penalties. Contract terms are generally one year or less.

During the second quarter of 2012, we paid approximately $53.8 million to fund tenant-related obligations, including tenant improvements and leasing commissions, and incurred approximately $66.0 million of new tenant-related obligations associated with approximately 1,417,000 square feet of second generation leases, or approximately $47 per square foot. In addition, we signed leases for approximately 39,000 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 second quarter of 2012, we signed leases for approximately 1,456,000 square feet of space and incurred aggregate tenant-related obligations of approximately $69.8 million, or approximately $48 per square foot.

ITEM 3—Quantitative and Qualitative Disclosures about Market Risk.

As of June 30, 2012, approximately $8.9 billion of our consolidated borrowings bore interest at fixed rates and none of our consolidated borrowings bore interest at variable rates. The fair value of these instruments is affected by changes in market interest rates. The table below does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, refer to Note 4 to the Consolidated

72

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.”

	2012			2013			2014			2015			2016			2017+			Total			Estimated Fair  Value
	(dollars in thousands)
	Secured debt
Fixed Rate	$	9,660		$	107,480		$	91,719		$	30,339		$	401,855		$	2,236,072		$	2,877,125		$	2,985,393
Average Interest Rate		6.55	%		5.99	%		5.66	%		5.87	%		6.84	%		5.18	%		5.47	%
Variable Rate		—			—			—			—			—			—			—			—
	Unsecured debt
Fixed Rate	$	—		$	224,952		$	—		$	549,408			—		$	4,089,053		$	4,863,413		$	5,236,475
Average Interest Rate		—			6.36	%		—			5.47	%		—			4.65	%		4.82	%
Variable Rate		—			—			—			—			—			—			—			—
	Unsecured exchangeable debt
Fixed Rate(1)	$	—		$	450,000		$	745,132		$	—		$	—		$	—		$	1,195,132		$	1,328,569
Adjustment for the equity component allocation		(13,973	)		(23,052	)		(2,438	)		—			—			—			(39,463	)
Total Fixed Rate		(13,973	)		426,948			742,694			—			—			—			1,155,669
Average Interest Rate		—			5.96	%		6.56	%		—			—			—			6.33	%
Variable Rate		—			—			—			—			—			—			—			—
Total Debt	$	(4,313	)	$	759,380		$	834,413		$	579,747		$	401,855		$	6,325,125		$	8,896,207		$	9,550,437

(1) Amounts are included in the year in which the first optional redemption date occurs (or, in the case of the exchangeable notes due 2014, the year of maturity).

At June 30, 2012, the weighted-average coupon/stated rates on all of our fixed and variable rate debt were 4.90% per annum and 0.00% per annum, respectively. The weighted-average coupon/stated rates for our unsecured debt and unsecured exchangeable debt were 4.73% per annum and 3.80% per annum, respectively.

At June 30, 2012, 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 and Chief 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 second quarter of our fiscal year ending December 31, 2012 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

73

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, 2011.

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

(a) During the three months ended June 30, 2012, we issued an aggregate of 26,309 common shares in exchange for 26,309 common units of limited partnership held by certain limited partners of BPLP. Of these shares, 7,384 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.

74

ITEM 6—Exhibits.

(a) Exhibits

4.1		Supplemental Indenture No. 12, dated as of June 11, 2012, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on June 11, 2012).
4.2		Form of 3.85% Senior Notes due 2023 (attached as Exhibit A to Supplemental Indenture No. 12 filed as Exhibit 4.1 hereto) (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on June 11, 2012).
10.1		Boston Properties, Inc. 2012 Stock Option and Incentive Plan (incorporated by reference to Exhibit A to Boston Properties, Inc.’s Proxy Statement on Schedule 14A filed on March 30, 2012).
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 June 30, 2012 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. As provided in Rule 406T of Regulation S-T, this information is filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.

75

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.
August 8, 2012		/s/    MICHAEL E. LABELLE
		Michael E. LaBelle
		Chief Financial Officer
		(duly authorized officer and
		principal financial officer)

76

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 six months ended June 30, 2012 and the five years ended December 31, 2011 were as follows:

	Six Months Ended  June 30, 2012			Year Ended December 31,
				2011			2010			2009			2008			2007
	(dollars in thousands)
Earnings:
Add:
Income from continuing operations before income (loss) from unconsolidated joint ventures	$	120,276		$	227,930		$	150,819		$	250,681		$	279,401		$	336,375
Gains on sales of real estate		—			—			2,734			11,760			33,340			929,785
Amortization of interest capitalized		2,593			4,188			2,660			2,498			2,315			2,394
Distributions from unconsolidated joint ventures		8,791			22,451			10,733			6,676			5,988			7,157
Fixed charges (see below)		225,982			445,648			422,403			375,243			345,834			346,731
Subtract:
Interest capitalized		(21,278	)		(48,178	)		(40,981	)		(48,816	)		(46,286	)		(33,322	)
Preferred distributions of consolidated subsidiaries		(1,566	)		(3,339	)		(3,343	)		(3,594	)		(4,226	)		(10,429	)
Total earnings	$	334,798		$	648,700		$	545,025		$	594,448		$	616,366		$	1,578,691
Fixed charges:
Interest expensed	$	203,138		$	394,131		$	378,079		$	322,833		$	295,322		$	302,980
Interest capitalized		21,278			48,178			40,981			48,816			46,286			33,322
Preferred distributions of consolidated subsidiaries		1,566			3,339			3,343			3,594			4,226			10,429
Total fixed charges	$	225,982		$	445,648		$	422,403		$	375,243		$	345,834		$	346,731
Preferred dividends		—			—			—			—			—			—
Total combined fixed charges and preferred dividends	$	225,982		$	445,648		$	422,403		$	375,243		$	345,834		$	346,731
Ratio of earnings to fixed charges		1.48			1.46			1.29			1.58			1.78			4.55
Ratio of earnings to combined fixed charges and preferred dividends		1.48			1.46			1.29			1.58			1.78			4.55

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Mortimer B. Zuckerman, 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: August 8, 2012

/s/    MORTIMER B. ZUCKERMAN        

Mortimer B. Zuckerman

Chairman of the Board and 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: August 8, 2012

/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 June 30, 2012 (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: August 8, 2012

/s/    MORTIMER B. ZUCKERMAN        

Mortimer B. Zuckerman

Chairman of the Board and 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 June 30, 2012 (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: August 8, 2012

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle

Chief Financial Officer

XML

Investments In Unconsolidated Joint Ventures (Balance Sheets Of The Unconsolidated Joint Ventures) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
ASSETS
Real estate and development in process, net	$ 11,365,172		$ 10,746,486
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable	2,877,125		3,123,267
Other liabilities	308,354		293,515
Total liabilities and members'/partners' equity	15,280,629		14,782,966
Carrying value of the Company's investments in unconsolidated joint ventures	670,653		669,722
Unconsolidated Joint Ventures [Member]
ASSETS
Real estate and development in process, net	4,519,909		4,542,594
Other assets	675,191		668,113
Total assets	5,195,100		5,210,707
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable	3,018,423		2,988,894
Other liabilities	822,672		854,257
Members'/Partners' equity	1,354,005		1,367,556
Total liabilities and members'/partners' equity	5,195,100		5,210,707
Company's share of equity	799,513		799,479
Basis differentials	(128,860)	[1]	(129,757)	[1]
Carrying value of the Company's investments in unconsolidated joint ventures	$ 670,653		$ 669,722

[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.

XML

Stock Option And Incentive Plan (Narrative) (Detail) (USD $)	6 Months Ended	0 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended
	Jun. 30, 2012	Feb. 13, 2012 Executive Vice President [Member] Month Year	Jun. 30, 2012 Executive Vice President [Member]	Feb. 13, 2012 2011 Outperformance Award [Member] Executive Vice President [Member]	Feb. 07, 2012 OPP Units 2012 [Member] Day	Jan. 25, 2012 OPP Units 2012 [Member] Year	Jun. 30, 2012 OPP Units 2012 [Member] Day Year	Jun. 30, 2012 OPP Units 2012 [Member] OPP Awards Vesting 2015 [Member]	Jun. 30, 2012 OPP Units 2012 [Member] OPP Awards Vesting 2016 [Member]	Jun. 30, 2012 OPP Units 2012 [Member] Opp Awards Vesting 2017 [Member]	Jun. 30, 2012 TRS Component Sliding Scale One [Member] Year	Jun. 30, 2012 TRS Component Sliding Scale Two [Member]	Jun. 30, 2012 TRS Component Sliding Scale Three [Member] Year	Jun. 30, 2012 TRS Component Sliding Scale Three [Member] Minimum [Member]	Jun. 30, 2012 TRS Component Sliding Scale Three [Member] Maximum [Member]	Jun. 30, 2012 TRS Component Hypothetical Situation [Member] Year	Jun. 30, 2012 2012 Stock Option And Incentive Plan [Member] Year
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
TRS measurement, years						3					3		3			3
Award additional vesting period, years						2
Trading days prior to and including February 7, 2012					5
Measurement Period For Outperformance Awards							February 7, 2012 to February 6, 2015
Start of the measurement period							Feb. 07, 2012
End of the measurement period							Feb. 06, 2015
Average closing price of common stock for five trading days prior and including February 7, 2012					$ 106.69
Aggregate rewards of OPP awards, maximum cap							$ 40,000,000
Excess total return above a cumulative absolute TRS hurdle							2.00%
Cumulative absolute TRS hurdle							24.00%				24.00%			0.00%	24.00%	18.00%
Cumulative absolute TRS hurdle,annum							8.00%					0.00%				6.00%
Measurement period for cumulative absolute TRS hurdle (years)							3
Excess or deficient total return of relative TRS hurdle equal to total return of REIT Index							2.00%
Percentage of the potential relative TRS component earned if the Company's TRS is equal to or greater than a cumulative 24% over three years											100.00%
Percentage earned if the Company's TRS is 0%												0.00%
Percentage calculated by linear interpolation earned if the company's cumulative TRS over three years is between 0% and 24%, minimum													0.00%
Percentage calculated by linear interpolation earned if the company's cumulative TRS over three years is between 0% and 24%, maximum													100.00%
Potential relative TRS component proration percentage																75.00%
Vesting Percentage								25.00%	25.00%	50.00%
Vesting Date								Feb. 07, 2015	Feb. 07, 2016	Feb. 07, 2017
Performance measurement period, days							15
Distributions percent before measurement date							10.00%
LTIP And Common Units Equivalency Ratio	One-for-one
Cash payment related to resignation		1,533,333
Cash bonus for 2011 as part of resignation agreement		950,000
Consulting period, months		2
Consulting fee, per month		20,000
Accelerated share vesting with respect to LTIP units		23,502
Common shares received due to accelerated share vesting with respect to stock options		4,464
Accelerated share vesting with respect to common stock		5,117
Common stock exercise price per share for stock options		$ 92.71
Common stock exercise price per share for common stock		$ 104.47
Percentage of outperformance award retained				36.00%
Non-compete agreement, years		1
Expense recognized upon resignation			$ 4,500,000
Maximum number of shares of common stock, Authorized shares																	13,000,000
Other than stock options awards conversion ratio																	2.32
Stock option awards conversion ratio																	1.0
Stock option and incentive plan term period																	10

XML

Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Detail) (USD $)	1 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended
	Feb. 05, 2012 Series Two Preferred Units [Member]	Jun. 30, 2012 Redemption Year Two Thousand Thirteen [Member]	Jun. 30, 2012 Redemption Year Two Thousand Fourteen [Member]	Feb. 05, 2012 OP Units [Member]	Jun. 30, 2012 Noncontrolling Interest [Member]	Jun. 30, 2012 Noncontrolling Interest [Member] Series Two Preferred Units [Member]	May 15, 2012 Noncontrolling Interest [Member] Series Two Preferred Units [Member]	Feb. 15, 2012 Noncontrolling Interest [Member] Series Two Preferred Units [Member]	Dec. 31, 2011 Noncontrolling Interest [Member] Series Two Preferred Units [Member]	Dec. 31, 2010 Noncontrolling Interest [Member] Series Two Preferred Units [Member]	Dec. 31, 2009 Noncontrolling Interest [Member] Series Two Preferred Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Series Two Preferred Units					1,030,748	1,030,748
Liquidation preference percentage						6.00%
Preferred units liquidation preference						$ 50.00
Operating units liquidation preference						$ 38.10
OP Units for each preferred unit						1.312336
Maximum redeemable Preferred Units		1,007,662	1,007,662
Dates Series Two Preferred holders can require Operating Partnership to redeem their units for cash		May 14, 2013	May 12, 2014
Series Two Preferred Units redemption price per unit		$ 50.00	$ 50.00
Maximum portion that may be required for redemption of total		0.166666666667	0.166666666667
Number of holders exercising redemption rights						0			0	0	0
Units converted	82,296			108,000
Distributions to Series Two Preferred Units							$ 0.73151	$ 0.75616

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Stock Option And Incentive Plan (Restricted Stock) (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Shares issued	150,794,602		150,794,602		148,186,511
Value of shares of common stock	$ 1,507,000		$ 1,507,000		$ 1,481,000
Stock-based compensation expense associated with restricted stock, LTIP Units, 2008 OPP Units, 2011 OPP Units and 2012 OPP Units	6,400,000	5,600,000	17,400,000	17,200,000
Accelerated Compensation Expenses Related To 2008 Opp Units				4,300,000
Executive Vice President [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Stock-based compensation expense associated with restricted stock, LTIP Units, 2008 OPP Units, 2011 OPP Units and 2012 OPP Units			2,700,000
OPP Units 2012 [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Opp Units Value	7,700,000		7,700,000
Method of valuation			The Monte Carlo simulation used a statistical formula underlying the Black-Scholes and binomial formulas and such simulation was run approximately 100,000 times.
Expected price volatility			31.00%
Risk-free rate			0.35%
Estimated dividend payments, per share			7.28
2012 OPP Units issued	400,000		400,000
OPP Units 2012 [Member] | SNL Equity REIT [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Expected price volatility			30.00%
Non Qualified Stock Options [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Method of valuation			The non-qualified stock options granted during the six months ended June 30, 2012 had a weighted-average fair value on the date of grant of $19.50 per option, which was computed using the Black-Scholes option-pricing model utilizing the following weighted-average assumptions an expected life of 5.4 years, a risk-free interest rate of 0.92%, an expected price volatility of 28.4% and an expected dividend yield of 2.9%.
Expected price volatility			28.40%
Risk-free rate			0.92%
Non-qualified stock options issued	186,007		186,007
Weighted-average grant date fair value			$ 19.50
Expected life assumed to calculate per unit fair value per LTIP unit (years)			5 years 4 months
Expected dividend rate			2.90%
Weighted-average exercise price			$ 107.23
LTIP Units [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Expected price volatility			29.10%
Risk-free rate			0.94%
LTIP Units issued	174,650		174,650
Expected life assumed to calculate per unit fair value per LTIP unit (years)			5 years 9 months 18 days
Value of LTIP Units issued			17,300,000
Per unit fair value weighted-average	$ 98.83		$ 98.83
LTIPs And Restricted Stock [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Vesting annual installments			4
Unrecognized compensation expenses	29,400,000		29,400,000
Unvested 2011 and 2012 OPP Units [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Unrecognized compensation expenses	10,400,000		10,400,000
Weighted-average period (years)			2 years 9 months 18 days
Restricted Stock [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Shares issued	20,756		20,756
Employee and director payment per share			$ 0.01
Value of shares of common stock	$ 2,200,000		$ 2,200,000
Employee's weighted average cost per share	$ 107.31		$ 107.31
LTIPs and OPP Awards [Member]
Stock Option And Incentive Plan And Stock Purchase Plan [Line Items]
Employee and director payment per share			$ 0.25

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Commitments And Contingencies (Narrative) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012
Commitments And Contingencies Disclosure [Line Items]
Letter of credit and performance obligations	$ 16,400,000
Property insurance program per occurrence limits	1,000,000,000
Per occurrence limit for NBCR Coverage	1,000,000,000
Value of program trigger	100,000,000
Coinsurance of program trigger	15.00%
Deductible in insurance as a percentage of the value of the affected property, San Francisco	5.00%
Per occurrence limit of the earthquake insurance which covers San Francisco region	120,000,000
Annual aggregate limit of the earthquake insurance which covers San Francisco region	120,000,000
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco	20,000,000
Operating partnership guarantee to cover liabilities of IXP	20,000,000
601 Lexington Avenue [Member]
Commitments And Contingencies Disclosure [Line Items]
Coverage for acts of Terrorism certified under TRIA in excess of amount provided by NYIXP, LLC, as a direct insurer	250,000,000
767 Venture, LLC [Member]
Commitments And Contingencies Disclosure [Line Items]
Maximum funding obligation	20,200,000
Property insurance program per occurrence limits	1,625,000,000
Coverage for acts of Terrorism certified under TRIA in excess of amount provided by NYIXP, LLC, as a direct insurer	1,375,000,000
Terrorism Coverage	$ 250,000,000

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Real Estate Activity During The Six Months Ended June 30, 2012 (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended										4 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Montvale Center [Member]	Jun. 30, 2012 Bedford Business Park [Member]	May 17, 2012 Bedford Business Park [Member] sqft	May 17, 2012 Office/Technical Properties [ Member] Bedford Business Park [Member] Property	May 17, 2012 Class A Office Properties [ Member] Bedford Business Park [Member] Property	Jan. 03, 2012 Two Patriots Park [Member] sqft	May 04, 2012 One Patriots Park [Member] sqft	Apr. 30, 2012 510 Madison Avenue [Member] sqft	Jun. 30, 2012 453 Ravendale Drive [Member]	Jun. 30, 2012 453 Ravendale Drive [Member]	Mar. 01, 2012 453 Ravendale Drive [Member] sqft	Jun. 30, 2012 100 Federal Street [Member] sqft	Jun. 30, 2012 100 Federal Street [Member] Floors sqft	Mar. 13, 2012 100 Federal Street [Member]
Acquisition date														Mar. 01, 2012			Mar. 13, 2012
Acquisition aggregate purchase price															$ 6,700,000			$ 615,000,000
Square footage of real estate property							470,000			256,000	268,000	356,000			30,000	1,264,000	1,264,000
Square footage of signed lease																	735,000
Number of floors in building																	37
Total revenues	472,897,000	433,867,000	918,124,000	849,149,000									200,000			19,500,000
Operating income	173,711,000	153,612,000	317,730,000	290,956,000									40,000			3,300,000
Debt default, accrued interest rate					9.93%
Amount of debt extinguished					25,000,000
Maturity Date					Jun. 06, 2012
Discontinued operations Gain			17,807,000		17,807,000
Disposition price						62,800,000
Net cash proceeds from sale of real estate properties						62,000,000
Gain on sale of real estate properties	$ 36,877,000		$ 36,877,000			$ 36,900,000
Number of real estate properties								2	1

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Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Add:	$ 173,711,000	$ 153,612,000	$ 317,730,000	$ 290,956,000
Development and management services income	9,564,000	9,095,000	17,710,000	16,521,000
Income from unconsolidated joint ventures	21,191,000	8,882,000	32,912,000	16,858,000
Interest and other income	2,382,000	1,953,000	4,028,000	2,927,000
Gains from early extinguishments of debt	(186,000)	6,000	615,000	379,000
Income (loss) from discontinued operations	274,000		1,041,000
Gain on sale of real estate from discontinued operations	36,877,000		36,877,000
Gain on forgiveness of debt from discontinued operations			17,807,000
General and administrative expense	19,066,000	18,721,000	46,685,000	43,364,000
Transaction costs	8,000	1,361,000	2,112,000	1,433,000
Depreciation and amortization expense	111,643,000	110,259,000	220,583,000	218,852,000
Interest expense	99,901,000	94,583,000	203,138,000	193,108,000
Losses (gains) from investments in securities	398,000	(132,000)	884,000	(80,000)
Noncontrolling interest in property partnerships	457,000	503,000	1,003,000	1,032,000
Noncontrolling interest-redeemable preferred units of the Operating Partnership	765,000	842,000	1,566,000	1,665,000
Noncontrolling interest-common units of the Operating Partnership	10,360,000	8,194,000	16,400,000	14,296,000
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	4,094,000	(15,000)	6,115,000	(10,000)
Net income attributable to Boston Properties, Inc.	119,070,000	60,214,000	183,672,000	100,949,000
Business Intersegment, Eliminations [Member]
Add:	294,864,000	274,858,000	569,400,000	538,084,000
Development and management services income	9,564,000	9,095,000	17,710,000	16,521,000
Income from unconsolidated joint ventures	21,191,000	8,882,000	32,912,000	16,858,000
Interest and other income	2,382,000	1,953,000	4,028,000	2,927,000
Gains from early extinguishments of debt	274,000		1,041,000
Income (loss) from discontinued operations	398,000	(132,000)	884,000	(80,000)
Gain on sale of real estate from discontinued operations	36,877,000		36,877,000
Gain on forgiveness of debt from discontinued operations			17,807,000
General and administrative expense	19,066,000	18,721,000	46,685,000	43,364,000
Transaction costs	8,000	1,361,000	2,112,000	1,433,000
Depreciation and amortization expense	111,643,000	110,259,000	220,583,000	218,852,000
Interest expense	99,901,000	94,583,000	203,138,000	193,108,000
Losses (gains) from investments in securities	186,000	(6,000)	(615,000)	(379,000)
Noncontrolling interest in property partnerships	457,000	503,000	1,003,000	1,032,000
Noncontrolling interest-redeemable preferred units of the Operating Partnership	765,000	842,000	1,566,000	1,665,000
Noncontrolling interest-common units of the Operating Partnership	10,360,000	8,194,000	16,400,000	14,296,000
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	4,094,000	(15,000)	6,115,000	(10,000)
Net income attributable to Boston Properties, Inc.	$ 119,070,000	$ 60,214,000	$ 183,672,000	$ 100,949,000

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Unsecured Senior Notes (Tables)

6 Months Ended

Jun. 30, 2012

unsecured senior notes outstanding

The following summarizes the unsecured senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Principal Amount			Maturity Date(2)
10 Year Unsecured Senior Notes		6.250	%		6.381	%	$	182,432		January 15, 2013(3)
10 Year Unsecured Senior Notes		6.250	%		6.291	%		42,568		January 15, 2013(3)
12 Year Unsecured Senior Notes		5.625	%		5.693	%		300,000		April 15, 2015
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000		June 1, 2015
10 Year Unsecured Senior Notes		5.875	%		5.967	%		700,000		October 15, 2019
10 Year Unsecured Senior Notes		5.625	%		5.708	%		700,000		November 15, 2020
10 Year Unsecured Senior Notes		4.125	%		4.289	%		850,000		May 15, 2021
7 Year Unsecured Senior Notes		3.700	%		3.853	%		850,000		November 15, 2018
11 Year Unsecured Senior Notes		3.850	%		3.954	%		1,000,000		February 1, 2023
Total principal								4,875,000
Net unamortized discount								(11,587	)
Total							$	4,863,413

(1) Yield on issuance date including the effects of discounts on the notes.

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

(3) On July 25, 2012, the Company’s Operating Partnership issued notice to redeem these notes on August 24, 2012 (See Note 14).

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Noncontrolling Interests (Common Units) (Narrative) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012 Year	Jun. 15, 2012	Apr. 30, 2012	Jan. 27, 2012
Quarter 4 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividends payable	Jan. 27, 2012
Distribution, record date	Dec. 31, 2011
Quarter 1 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividends payable	Apr. 30, 2012
Distribution, record date	Mar. 30, 2012
Quarter Two [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Dividend declared date	Jun. 15, 2012
Dividends payable	Jul. 31, 2012
Distribution, record date	Jun. 29, 2012
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption	225,835
Redemption of OP units issued on conversion of Series Two Preferred Units	108,000
Redemption Of OP Units Issued On Conversion Of LTIP Units	67,256
Outperformance Awards LTIP Units distribution as percentage of OP Unit distribution prior to measurement date	10.00%
Distributions declared to OP and LTIP units per unit			$ 0.55	$ 0.55
Distributions made to outperformance awards long term incentive plan Units Per Unit			$ 0.055	$ 0.055
Distributions declared to OP and LTIP units per unit		$ 0.55
Distributions made to outperformance awards long term incentive plan Units Per Unit		$ 0.055
Restriction On Redemption	1
Op Unit Equivalence To Common Stock	1
Common units of operating partnership if converted value	$ 1,970,000,000
Value Of Series Two Preferred Units If Converted To Common Stock	$ 146,600,000
Closing price of common stock	$ 108.37
OPP Units 2011 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units	400,000
OPP Units 2012 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units	400,000

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Unsecured Senior Notes (Unsecured Senior Notes Outstanding) (Detail) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 10 Year Unsecured Senior Notes, 6.381% [Member]		Jun. 30, 2012 10 Year Unsecured Senior Notes, 6.291% [Member]		Jun. 30, 2012 12 Year Unsecured Senior Notes, 5.693% [Member]		Jun. 30, 2012 12 Year Unsecured Senior Notes, 5.194% [Member]		Jun. 30, 2012 10 Year Unsecured Senior Notes, 5.967% [Member]		Jun. 30, 2012 10 Year Unsecured Senior Notes, 5.708% [Member]		Jun. 30, 2012 10 Year Unsecured Senior Notes, 4.289% [Member]		Jun. 30, 2012 7 Year Unsecured Senior Notes, 3.853% [Member]		Jun. 30, 2012 Eleven Year Unsecured Senior Notes Three Point Nine Five Four Percent [Member]		Jun. 30, 2012 Senior Notes [Member]	Jun. 30, 2012 Unsecured Senior Notes [Member]
Debt [Line Items]
Coupon/Stated Rate			6.25%		6.25%		5.625%		5.00%		5.875%		5.625%		4.125%		3.70%		3.85%
Effective Rate			6.381%	[1]	6.291%	[1]	5.693%	[1]	5.194%	[1]	5.967%	[1]	5.708%	[1]	4.289%	[1]	3.853%	[1]	3.954%	[1]
Principal Amount	$ 1,197,500		$ 182,432		$ 42,568		$ 300,000		$ 250,000		$ 700,000		$ 700,000		$ 850,000		$ 850,000		$ 1,000,000		$ 4,875,000
Net unamortized discount	(11,587)	(9,814)																				(11,587)
Unsecured senior notes	$ 4,863,413	$ 3,865,186
Maturity Date			Jan. 15, 2013	[2],[3]	Jan. 15, 2013	[2],[3]	Aug. 15, 2015	[2]	Jun. 01, 2015	[2]	Oct. 15, 2019	[2]	Nov. 15, 2020	[2]	May 15, 2021	[2]	Nov. 15, 2018	[2]	Feb. 01, 2023	[2]

[1] Yield on issuance date including the effects of discounts on the notes.

[2] No principal amounts are due prior to maturity.

[3] On July 25, 2012, the Company's Operating Partnership issued notice to redeem these notes on August 24, 2012 (See Note 14).

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Real Estate Activity During The Six Months Ended June 30, 2012 (Summary Of The Discontinued Operations Related To Montvale Center And Bedford Business Park) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	$ 472,897,000	$ 433,867,000	$ 918,124,000	$ 849,149,000
Expenses
Depreciation and amortization	111,643,000	110,259,000	220,583,000	218,852,000
Total expenses	299,186,000	280,255,000	600,394,000	558,193,000
Operating income	173,711,000	153,612,000	317,730,000	290,956,000
Other expense
Interest expense	99,901,000	94,583,000	203,138,000	193,108,000
Income (loss) from discontinued operations	398,000	(132,000)	884,000	(80,000)
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership	4,094,000	(15,000)	6,115,000	(10,000)
Income (loss) from discontinued operations attributable to Boston Properties, Inc.	33,181,000	(117,000)	49,453,000	(70,000)
Gain on sale of real estate from discontinued operations	36,877,000		36,877,000
Gain on forgiveness of debt from discontinued operations			17,807,000
Montvale Center and Bedford Business Park [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	1,091,000	2,584,000	3,748,000	5,177,000
Expenses
Operating	450,000	1,242,000	1,602,000	2,322,000
Depreciation and amortization	243,000	821,000	1,040,000	1,656,000
Total expenses	693,000	2,063,000	2,642,000	3,978,000
Operating income	398,000	521,000	1,106,000	1,199,000
Other expense
Interest expense		(653,000)	(222,000)	(1,279,000)
Income (loss) from discontinued operations	398,000	(132,000)	884,000	(80,000)
Noncontrolling interest in income (loss) from discontinued operations - common units of the Operating Partnership	(42,000)	15,000	(94,000)	10,000
Income (loss) from discontinued operations attributable to Boston Properties, Inc.	356,000	(117,000)	790,000	(70,000)
Gain on sale of real estate from discontinued operations	36,877,000		36,877,000
Gain on forgiveness of debt from discontinued operations			17,807,000
Noncontrolling interest in gain on sale of real estate and gain on forgiveness of debt from discontinued operations - common units of the Operating Partnership	(4,052,000)		(6,021,000)
Gain on sale of real estate and gain on forgiveness of debt from discontinued operations attributable to Boston Properties, Inc.	$ 32,825,000		$ 48,663,000

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Stockholders' Equity (Narrative) (Detail) (USD $)	1 Months Ended			6 Months Ended
	Jun. 15, 2012	Apr. 30, 2012	Jan. 27, 2012	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Class of Stock [Line Items]
Common stock, shares outstanding				150,715,702		148,107,611
At the market stock offering program, shares issued				150,794,602		148,186,511
At the market stock offering program, net proceeds				$ 247,186,000	$ 394,717,000
Shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees				22,823
Shares of its Common Stock in connection with the redemption of an equal number of OP Units				225,835
Dividend paid on common stock		$ 0.55	$ 0.55
Dividend declared on common stock	$ 0.55
Quarter 4 [Member]
Class of Stock [Line Items]
Dividend record date				Dec. 31, 2011
Dividend payable date				Jan. 27, 2012
Quarter 1 [Member]
Class of Stock [Line Items]
Dividend record date				Mar. 30, 2012
Dividend payable date				Apr. 30, 2012
Quarter Two [Member]
Class of Stock [Line Items]
Dividend record date				Jun. 29, 2012
Dividend payable date				Jul. 31, 2012
Dividend declared date				Jun. 15, 2012
Atm Program [Member]
Class of Stock [Line Items]
At the market stock offering program, aggregate value of common stock				600,000,000
At the market stock offering program, shares issued				2,347,500
At the market stock offering program, net proceeds				249,800,000
At the market stock offering program, net proceeds				247,200,000
At the market stock offering program remaining amount available for issuance				$ 305,300,000

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Noncontrolling Interests (Narrative) (Detail)	Jun. 30, 2012
Noncontrolling Interest [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Operating Partnership (OP) Units	16,514,469
Long-Term Incentive Plan (LTIP) Units	1,683,214
Series Two Preferred Units	1,030,748
Convertible Operating Partnership (OP) Units	1,352,688
OPP Units 2011 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units	400,000
OPP Units 2012 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Outperformance awards in LTIP Units	400,000

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Basis Of Presentation And Summary Of Significant Accounting Policies

6 Months Ended

Jun. 30, 2012

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., executes all significant business relationships. All majority-owned subsidiaries and affiliates 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, 2011. Certain prior year amounts have been reclassified to conform to the current year presentation.

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 fair value of the Company’s unsecured senior notes and unsecured exchangeable senior notes is categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company uses quoted market rates to value these instruments. However, the fair value could be categorized at a level 2 basis if trading volumes are low. The Company determines the fair value of its mortgage notes payable using discounted cash flow analyses by discounting the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt based on current market rates for similar securities. In determining the current market rates, the Company adds its estimates of market spreads to the quoted yields on federal government treasury securities with similar maturity dates to its debt. The fair value of the Company’s mortgage notes payable is 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 June 30, 2012 and December 31, 2011 (in thousands):

	June 30, 2012					December 31, 2011
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	2,877,125		$	2,985,393	$	3,123,267		$	3,297,903
Unsecured senior notes		4,863,413			5,236,475		3,865,186			4,148,461
Unsecured exchangeable senior notes		1,155,669	(1)		1,328,569		1,715,685	(1)		1,904,115
Total	$	8,896,207		$	9,550,437	$	8,704,138		$	9,350,479

(1) Includes the net impact of Accounting Standards Codification (“ASC”) ASC 470-20 totaling approximately $39.5 million and $54.5 million at June 30, 2012 and December 31, 2011, respectively.

Out-of-Period Adjustment

During the six months ended June 30, 2012, the Company recorded additional real estate operating expenses totaling approximately $3.2 million related to the cumulative non-cash straight-line adjustment to the ground rent expense of certain ground leases that were not previously recognized on a straight-line basis. This resulted in the overstatement of real estate operating expenses by approximately $3.2 million during the six months ended June 30, 2012 and in the understatement of real estate operating expenses in the aggregate amount of approximately $3.2 million in previous periods. Because this adjustment was not material to the prior years’ consolidated financial statements and the impact of recording the adjustment in the current period is not material to the Company’s consolidated financial statements, the Company recorded the related adjustment during the six months ended June 30, 2012.

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Unsecured Senior Notes (Narrative) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012
Proceeds from unsecured senior notes	$ 997,790,000
Eleven Year Unsecured Senior Notes Three Point Nine Five Four Percent [Member]
Public offering date	Jun. 11, 2012
Aggregate principal amount	1,000,000,000
Interest at a fixed rate	3.85%
Note price,percentage of principal amount	99.779%
Effective interest rate	3.954%	[1]
Maturity Date	Feb. 01, 2023	[2]
Proceeds from unsecured senior notes	$ 989,400,000
Senior Notes [Member]
Maximum leverage ratio	60.00%
Maximum secured debt leverage ratio	50.00%
Maximum interest coverage ratio	1.50
Minimum unencumbered asset value percentage of unsecured debt	150.00%

[1] Yield on issuance date including the effects of discounts on the notes.

[2] No principal amounts are due prior to maturity.

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Schedule Of Segment Information By Geographic Area And Property Type

For the three months ended June 30, 2012:
	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	157,642		$	122,657		$	15,617		$	53,650		$	88,740		$	438,306
Office/Technical		5,744			—			—			144			4,054			9,942
Residential		1,013			—			—			—			4,023			5,036
Hotel		10,049			—			—			—			—			10,049
Total		174,448			122,657			15,617			53,794			96,817			463,333
% of Grand Totals		37.65	%		26.47	%		3.37	%		11.61	%		20.90	%		100.0	%
Rental Expenses:
Class A Office		60,504			38,936			7,691			21,188			28,306			156,625
Office/Technical		1,652			—			—			38			964			2,654
Residential		367			—			—			—			2,207			2,574
Hotel		6,616			—			—			—			—			6,616
Total		69,139			38,936			7,691			21,226			31,477			168,469
% of Grand Totals		41.04	%		23.11	%		4.57	%		12.60	%		18.68	%		100.0	%
Net operating income	$	105,309		$	83,721		$	7,926		$	32,568		$	65,340		$	294,864
% of Grand Totals		35.71	%		28.39	%		2.69	%		11.05	%		22.16	%		100.0	%

For the three months ended June 30, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	135,505		$	113,407		$	15,811		$	54,168		$	86,114		$	405,005
Office/Technical		6,337			—			—			—			3,950			10,287
Residential		—			—			—			—			576			576
Hotel		8,904			—			—			—			—			8,904
Total		150,746			113,407			15,811			54,168			90,640			424,772
% of Grand Totals		35.49	%		26.70	%		3.72	%		12.75	%		21.34	%		100.0	%
Rental Expenses:
Class A Office		50,772			37,378			7,487			20,118			24,365			140,120
Office/Technical		1,779			—			—			—			1,011			2,790
Residential		—			—			—			—			723			723
Hotel		6,281			—			—			—			—			6,281
Total		58,832			37,378			7,487			20,118			26,099			149,914
% of Grand Totals		39.25	%		24.93	%		4.99	%		13.42	%		17.41	%		100.0	%
Net operating income	$	91,914		$	76,029		$	8,324		$	34,050		$	64,541		$	274,858
% of Grand Totals		33.44	%		27.66	%		3.03	%		12.39	%		23.48	%		100.0	%

For the six months ended June 30, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	298,650		$	240,246		$	30,467		$	105,847		$	179,137		$	854,347
Office/Technical		11,343			—			—			196			8,146			19,685
Residential		1,896			—			—			—			7,621			9,517
Hotel		16,865			—			—			—			—			16,865
Total		328,754			240,246			30,467			106,043			194,904			900,414
% of Grand Totals		36.51	%		26.68	%		3.38	%		11.78	%		21.65	%		100.0	%
Rental Expenses:
Class A Office		118,337			77,443			15,049			41,209			55,747			307,785
Office/Technical		3,152			—			—			62			2,011			5,225
Residential		757			—			—			—			4,532			5,289
Hotel		12,715			—			—			—			—			12,715
Total		134,961			77,443			15,049			41,271			62,290			331,014
% of Grand Totals		40.77	%		23.39	%		4.55	%		12.47	%		18.82	%		100.0	%
Net operating income	$	193,793		$	162,803		$	15,418		$	64,772		$	132,614		$	569,400
% of Grand Totals		34.03	%		28.59	%		2.71	%		11.38	%		23.29	%		100.0	%

For the six months ended June 30, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	262,302		$	226,414		$	32,090		$	107,061		$	168,795		$	796,662
Office/Technical		12,596			—			—			—			7,942			20,538
Residential		—			—			—			—			576			576
Hotel		14,852			—			—			—			—			14,852
Total		289,750			226,414			32,090			107,061			177,313			832,628
% of Grand Totals		34.80	%		27.19	%		3.85	%		12.86	%		21.30	%		100.0	%
Rental Expenses:
Class A Office		98,542			75,092			15,402			39,452			47,533			276,021
Office/Technical		3,647			—			—			—			2,133			5,780
Residential		—			—			—			—			723			723
Hotel		12,020			—			—			—			—			12,020
Total		114,209			75,092			15,402			39,452			50,389			294,544
% of Grand Totals		38.77	%		25.50	%		5.23	%		13.39	%		17.11	%		100.0	%
Net operating income	$	175,541		$	151,322		$	16,688		$	67,609		$	126,924		$	538,084
% of Grand Totals		32.62	%		28.12	%		3.10	%		12.57	%		23.59	%		100.0	%

Schedule Of Reconciliation Of Net Operating Income To Net Income

	Three months ended June 30,					Six months ended June 30,
	2012		2011			2012			2011
Net Operating Income	$	294,864	$	274,858		$	569,400		$	538,084
Add:
Development and management services income		9,564		9,095			17,710			16,521
Income from unconsolidated joint ventures		21,191		8,882			32,912			16,858
Interest and other income		2,382		1,953			4,028			2,927
Gains from early extinguishments of debt		274		—			1,041			—
Income (loss) from discontinued operations		398		(132	)		884			(80	)
Gain on sale of real estate from discontinued operations		36,877		—			36,877			—
Gain on forgiveness of debt from discontinued operations		—		—			17,807			—
Less:
General and administrative expense		19,066		18,721			46,685			43,364
Transaction costs		8		1,361			2,112			1,433
Depreciation and amortization expense		111,643		110,259			220,583			218,852
Interest expense		99,901		94,583			203,138			193,108
Losses (gains) from investments in securities		186		(6	)		(615	)		(379	)
Noncontrolling interest in property partnerships		457		503			1,003			1,032
Noncontrolling interest—redeemable preferred units of the Operating Partnership		765		842			1,566			1,665
Noncontrolling interest—common units of the Operating Partnership		10,360		8,194			16,400			14,296
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		4,094		(15	)		6,115			(10	)
Net income attributable to Boston Properties, Inc.	$	119,070	$	60,214		$	183,672		$	100,949

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Computation Of Basic And Diluted Earnings Per Share

	For the Three Months Ended June 30, 2012
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	85,889		150,312	$	0.57
Discontinued operations attributable to Boston Properties, Inc.		33,181		—		0.22
Net income attributable to Boston Properties, Inc.	$	119,070		150,312	$	0.79
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		382		—
Diluted Earnings:
Net income	$	119,070		150,694	$	0.79

	For the Three Months Ended June 30, 2011
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	60,331			145,864	$	0.41
Discontinued operations attributable to Boston Properties, Inc.		(117	)		—		—
Net income attributable to Boston Properties, Inc.	$	60,214			145,864	$	0.41
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			831		—
Diluted Earnings:
Net income	$	60,214			146,695	$	0.41

	For the six months ended June 30, 2012
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	134,219		149,328	$	0.90
Discontinued operations attributable to Boston Properties, Inc.		49,453		—		0.33
Net income attributable to Boston Properties, Inc.	$	183,672		149,328	$	1.23
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		392		—
Diluted Earnings:
Net income	$	183,672		149,720	$	1.23

	For the Six Months Ended June 30, 2011
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	101,019			143,990	$	0.70
Discontinued operations attributable to Boston Properties, Inc.		(70	)		—		—
Net income attributable to Boston Properties, Inc.	$	100,949			143,990	$	0.70
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			620		—
Diluted Earnings:
Net income	$	100,949			144,610	$	0.70

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Segment Reporting (Schedule Of Segment Reporting By Geographic Area And Property Type) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Class A Office	$ 438,306	$ 405,005	$ 854,347	$ 796,662
Office/Technical	9,942	10,287	19,685	20,538
Residential	5,036	576	9,517	576
Hotel	10,049	8,904	16,865	14,852
Total	463,333	424,772	900,414	832,628
% of Grand Totals	100.00%	100.00%	100.00%	100.00%
Class A Office	156,625	140,120	307,785	276,021
Office/Technical	2,654	2,790	5,225	5,780
Residential	2,574	723	5,289	723
Hotel	6,616	6,281	12,715	12,020
Total	168,469	149,914	331,014	294,544
% of Grand Totals	100.00%	100.00%	100.00%	100.00%
Net operating income	294,864		569,400
% of Grand Totals	100.00%	100.00%	100.00%	100.00%
Segment, Continuing Operations [Member]
Net operating income		274,858		538,084
Boston [Member]
Class A Office	157,642	135,505	298,650	262,302
Office/Technical	5,744	6,337	11,343	12,596
Residential	1,013		1,896
Hotel	10,049	8,904	16,865	14,852
Total	174,448	150,746	328,754	289,750
% of Grand Totals	37.65%	35.49%	36.51%	34.80%
Class A Office	60,504	50,772	118,337	98,542
Office/Technical	1,652	1,779	3,152	3,647
Residential	367		757
Hotel	6,616	6,281	12,715	12,020
Total	69,139	58,832	134,961	114,209
% of Grand Totals	41.04%	39.25%	40.77%	38.77%
Net operating income	105,309	91,914	193,793	175,541
% of Grand Totals	35.71%	33.44%	34.03%	32.62%
New York [Member]
Class A Office	122,657		240,246	226,414
Total	122,657	113,407	240,246	226,414
% of Grand Totals	26.47%	26.70%	26.68%	27.19%
Class A Office	38,936	37,378	77,443	75,092
Total	38,936	37,378	77,443	75,092
% of Grand Totals	23.11%	24.93%	23.39%	25.50%
Net operating income	83,721		162,803	151,322
% of Grand Totals	28.39%	27.66%	28.59%	28.12%
Princeton [Member]
Class A Office	15,617	15,811	30,467	32,090
Total	15,617	15,811	30,467	32,090
% of Grand Totals	3.37%	3.72%	3.38%	3.85%
Class A Office	7,691	7,487	15,049	15,402
Total	7,691	7,487	15,049	15,402
% of Grand Totals	4.57%	4.99%	4.55%	5.23%
Net operating income	7,926	8,324	15,418	16,688
% of Grand Totals	2.69%	3.03%	2.71%	3.10%
San Francisco [Member]
Class A Office	53,650	54,168	105,847	107,061
Office/Technical	144		196
Total	53,794	54,168	106,043	107,061
% of Grand Totals	11.61%	12.75%	11.78%	12.86%
Class A Office	21,188	20,118	41,209	39,452
Office/Technical	38		62
Total	21,226	20,118	41,271	39,452
% of Grand Totals	12.60%	13.42%	12.47%	13.39%
Net operating income	32,568	34,050	64,772	67,609
% of Grand Totals	11.05%	12.39%	11.38%	12.57%
Washington, DC [Member]
Class A Office	88,740	86,114	179,137	168,795
Office/Technical	4,054	3,950	8,146	7,942
Residential	4,023	576	7,621	576
Total	96,817	90,640	194,904	177,313
% of Grand Totals	20.90%	21.34%	21.65%	21.30%
Class A Office	28,306	24,365	55,747	47,533
Office/Technical	964	1,011	2,011	2,133
Residential	2,207	723	4,532	723
Total	31,477	26,099	62,290	50,389
% of Grand Totals	18.68%	17.41%	18.82%	17.11%
Net operating income	$ 65,340	$ 64,541	$ 132,614	$ 126,924
% of Grand Totals	22.16%	23.48%	23.29%	23.59%

XML

Unsecured Exchangeable Senior Notes (Schedule of Unsecured Exchangeable Senior Notes) (Detail) (USD $)			6 Months Ended			0 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 3.625% Exchangeable Senior Notes [Member]		Aug. 13, 2008 3.625% Exchangeable Senior Notes [Member]	Dec. 17, 2007 3.750% Exchangeable Senior Notes [Member]	Jun. 30, 2012 3.750% Exchangeable Senior Notes [Member]		Dec. 31, 2007 3.750% Exchangeable Senior Notes [Member]
Coupon/ Stated Rate			3.625%				3.75%
Effective Rate			4.037%	[1]			3.787%	[1]
Exchange Rate			8.5051	[2]			10.0066	[3]
First Optional Redemption Date by Company							May 18, 2013	[4]
Maturity Date			Feb. 15, 2014				Mar. 15, 2036
3.625% Exchangeable Senior Notes	$ 1,197,500,000		$ 747,500,000				$ 450,000,000
Net unamortized discount	(2,368,000)	(3,462,000)
Adjustment for the equity component allocation, net of accumulated amortization	(39,463,000)
Total	1,155,669,000	1,715,685,000
Initial exchange on principal amount of note			1,000						1,000
Initial exchange price per share			$ 117.58
Initial exchange rate			8.5051						9.3900
Revised exchange price due to capped call transaction			$ 137.17
Premium over closing price			40.00%
Closing price per share of common stock					$ 97.98
Effective exchange price			$ 134.94
Net cost of capped call transaction			$ 44,400,000
Special distribution per share common stock						$ 5.98
Revised exchange rate									10.0066
Revised exchange price resulting from special distribution									$ 99.93
Repurchase price of the notes							100.00%

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

[2] The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.'s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustment), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.'s common stock. The net cost of the capped call transactions was approximately $44.4 million. As of June 30, 2012, the effective exchange price was $134.94 per share.

[3] In connection with the special distribution of $5.98 per share of Boston Properties, Inc.'s common stock declared on December 17, 2007, the exchange rate was adjusted from 9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately$99.93 per share of Boston Properties, Inc.'s common stock.

[4] Holders may require the Operating Partnership to repurchase the notes for cash on May 18, 2013 and on May 15 of 2016, 2021, 2026 and 2031 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to 100% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date.

XML

Organization (Narrative) (Detail)	6 Months Ended
	Jun. 30, 2012 Year acre Vehicle sqft	Jun. 30, 2011
Real Estate Properties [Line Items]
General and limited partnership interest in the operating partnership	88.50%	87.50%
Restriction on redemption of OP units from date of issuance (years)	1
One OP unit is equivalent to one share of Common Stock	1
Number of series of preferred units outstanding	1
OP unit conversion rate	1
Square footage of real estate property	44,703
Area of parking in square feet	15,200,000
Area of undeveloped land parcels owned in acres	510.5
Value-added fund institutional investors	2
Commercial Real Estate Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	150
Number of real estate properties	42,800,000
Total Properties Under Construction [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	6
Number of real estate properties	2,200,000
Hotel Property [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
Retail Properties [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	3
Residential Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	3
Residential Properties Under Construction [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
Investments Through Value-Added Fund [Member]
Real Estate Properties [Line Items]
Number of real estate properties	24
Total Office Properties [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	143
Class A Office Properties [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	126
Office Properties Under Construction [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	5
Office/Technical Properties [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	17

XML

Basis Of Presentation And Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	$ 2,877,125		$ 3,123,267
Unsecured senior notes	4,863,413		3,865,186
Unsecured exchangeable senior notes	1,155,669		1,715,685
Net of the adjustment for the equity component allocation	39,463
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	2,877,125		3,123,267
Unsecured senior notes	4,863,413		3,865,186
Unsecured exchangeable senior notes	1,155,669	[1]	1,715,685	[1]
Total	8,896,207		8,704,138
Estimate of Fair Value, Fair Value Disclosure [Member]
Summary Of Significant Accounting Policies [Line Items]
Mortgage notes payable	2,985,393		3,297,903
Unsecured senior notes	5,236,475		4,148,461
Unsecured exchangeable senior notes	1,328,569		1,904,115
Total	9,550,437		9,350,479
ASC 470-20 Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Net of the adjustment for the equity component allocation	$ 39,500		$ 54,500

[1] Includes the net impact of Accounting Standards Codification ("ASC") ASC 470-20 totaling approximately $39.5 million and $54.5 million at June 30, 2012 and December 31, 2011, respectively.

XML

Organization

6 Months Ended

Jun. 30, 2012

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 June 30, 2012 owned an approximate 88.5% (87.5% at June 30, 2011) 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 2008, February 2011 and February 2012, the Company issued LTIP Units in connection with the granting to employees of outperformance awards (also referred to as “2008 OPP Units,” “2011 OPP Units” and “2012 OPP Units,” respectively, and collectively as “OPP Units”). Because the rights, preferences and privileges of OPP 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. On February 5, 2011, the measurement period for the Company’s 2008 OPP Unit awards expired and the Company’s total return to shareholders was not sufficient for employees to earn and therefore become eligible to vest in any of the 2008 OPP Unit awards. Accordingly, all 2008 OPP Unit awards were automatically forfeited (See Notes 9 and 12).

Unless specifically noted otherwise, all references to OP Units exclude units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership is obligated to redeem such OP Unit for cash equal to the value of a share of common stock of the Company (“Common Stock”) at such time. In lieu of a cash redemption, the Company may elect to acquire such OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that the Company owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock. An LTIP Unit is generally the economic equivalent of a share of restricted common stock of the Company. LTIP Units, whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Note 12).

At June 30, 2012, there was one series of Preferred Units outstanding (i.e., Series Two Preferred Units). The Series Two Preferred Units bear a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be converted into OP Units or redeemed for cash at the election of the holder thereof or the Operating Partnership in accordance with the terms and conditions set forth in the applicable amendment to the partnership agreement (See Note 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 June 30, 2012, the Company owned or had interests in a portfolio of 150 commercial real estate properties (the “Properties”) aggregating approximately 42.8 million net rentable square feet, including six properties under construction totaling approximately 2.2 million net rentable square feet. In addition, the Company has structured parking for approximately 44,703 vehicles containing approximately 15.2 million square feet. At June 30, 2012, the Properties consist of:

• 143 office properties, including 126 Class A office properties (including five properties under construction) and 17 Office/Technical properties;

• one hotel;

• three retail properties; and

• three residential properties (including one property under construction).

The Company owns or controls undeveloped land parcels totaling approximately 510.5 acres. In addition, the Company has a noncontrolling interest in the Boston Properties Office Value-Added Fund, L.P. (the “Value-Added Fund”), which is a strategic partnership with two institutional investors through which the Company has pursued the acquisition of value-added investments in assets within its existing markets. The Company’s investments through the Value-Added Fund are not included in its portfolio information or any other portfolio level statistics. At June 30, 2012, the Value-Added Fund had investments in 24 buildings comprised of an office property in Chelmsford, Massachusetts and office complexes in Mountain View, California.

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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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Misstatement of real estate operating expense	$ 3.2

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Investments In Unconsolidated Joint Ventures (Statement Of Operations Of The Joint Ventures) (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 472,897,000		$ 433,867,000		$ 918,124,000		$ 849,149,000
Expenses
Depreciation and amortization	(111,643,000)		(110,259,000)		(220,583,000)		(218,852,000)
Total expenses	(299,186,000)		(280,255,000)		(600,394,000)		(558,193,000)
Operating income	173,711,000		153,612,000		317,730,000		290,956,000
Other expense
Interest expense	(99,901,000)		(94,583,000)		(203,138,000)		(193,108,000)
Net income (loss)	134,746,000		69,738,000		208,756,000		117,932,000
Income from unconsolidated joint ventures	21,191,000		8,882,000		32,912,000		16,858,000
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues	156,035,000	[1]	144,987,000	[1]	295,135,000	[1]	290,632,000	[1]
Expenses
Operating	39,261,000		42,272,000		78,153,000		85,114,000
Depreciation and amortization	42,679,000		48,243,000		84,578,000		98,880,000
Total expenses	81,940,000		90,515,000		162,731,000		183,994,000
Operating income	74,095,000		54,472,000		132,404,000		106,638,000
Other expense
Interest expense	55,909,000		57,007,000		111,271,000		114,768,000
Net income (loss)	18,186,000		(2,535,000)		21,133,000		(8,130,000)
Company's share of net income (loss)	10,641,000		(2,284,000)		12,012,000		(5,339,000)
Basis differential	431,000		1,759,000		897,000		3,515,000
Elimination of inter-entity interest on partner loan	10,119,000		9,407,000		20,003,000		18,682,000
Income from unconsolidated joint ventures	21,191,000		8,882,000		32,912,000		16,858,000
Straight-line rent adjustments	2,800,000		4,000,000		7,100,000		8,100,000
"Above" and "below" market rent adjustments, net	23,200,000		29,200,000		48,500,000		58,700,000
Termination income	19,600,000				19,600,000
Company's share of termiantion income	$ 11,800,000				$ 11,800,000

[1] Includes straight-line rent adjustments of $2.8 million and $4.0 million for the three months ended June 30, 2012 and 2011, respectively, and $7.1 million and $8.1 million for the six months ended June 30, 2012 and 2011, respectively. Includes net below-market rent adjustments of $23.2 million and $29.2 million for the three months ended June 30, 2012 and 2011, respectively, and $48.5 million and $58.7 million for the six months ended June 30, 2012 and 2011, respectively. Total revenue for the three and six months ended June 30, 2012 includes termination income totaling approximately $19.6 million (of which the Company's share is approximately $11.8 million) related to a lease termination with a tenant at the General Motors Building.

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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share ) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Line Items]
Income from continuing operations attributable to Boston Properties, Inc.	$ 85,889	$ 60,331	$ 134,219	$ 101,019
Discontinued operations attributable to Boston Properties, Inc.	33,181	(117)	49,453	(70)
Net income attributable to Boston Properties, Inc.	119,070	60,214	183,672	100,949
Stock Based Compensation and Exchangeable Senior Notes
Net income	$ 119,070	$ 60,214	$ 183,672	$ 100,949
Net income attributable to Boston Properties, Inc.	150,312	145,864	149,328	143,990
Stock Based Compensation and Exchangeable Senior Notes	382	831	392	620
Net income	150,694	146,695	149,720	144,610
Income from continuing operations attributable to Boston Properties, Inc.	$ 0.57	$ 0.41	$ 0.90	$ 0.70
Discontinued operations attributable to Boston Properties, Inc.	$ 0.22		$ 0.33
Net income attributable to Boston Properties, Inc.	$ 0.79	$ 0.41	$ 1.23	$ 0.70
Stock Based Compensation and Exchangeable Senior Notes
Net income	$ 0.79	$ 0.41	$ 1.23	$ 0.70

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Real estate, at cost	$ 13,143,487	$ 12,303,965
Construction in progress	732,734	818,685
Land held for future development	270,169	266,822
Less: accumulated depreciation	(2,781,218)	(2,642,986)
Total real estate	11,365,172	10,746,486
Cash and cash equivalents	1,671,997	1,823,208
Cash held in escrows	31,381	40,332
Investments in securities	11,036	9,548
Tenant and other receivables (net of allowance for doubtful accounts of $1,834 and $1,766, respectively)	43,507	79,838
Related party notes receivable	282,416	280,442
Interest receivable from related party notes receivable	98,866	89,854
Accrued rental income (net of allowance of $2,693 and $2,515, respectively)	559,646	522,675
Deferred charges, net	504,475	445,403
Prepaid expenses and other assets	41,480	75,458
Investments in unconsolidated joint ventures	670,653	669,722
Total assets	15,280,629	14,782,966
Liabilities:
Mortgage notes payable	2,877,125	3,123,267
Unsecured senior notes (net of discount of $11,587 and $9,814, respectively)	4,863,413	3,865,186
Unsecured exchangeable senior notes (net of discount of $2,368 and $3,462, respectively)	1,155,669	1,715,685
Unsecured line of credit
Accounts payable and accrued expenses	163,496	155,139
Dividends and distributions payable	93,353	91,901
Accrued interest payable	61,947	69,105
Other liabilities	308,354	293,515
Total liabilities	9,523,357	9,313,798
Commitments and contingencies
Noncontrolling interest:
Redeemable preferred units of the Operating Partnership	51,537	55,652
Noncontrolling interests:
Common units of the Operating Partnership	573,241	548,581
Property partnerships	(1,560)	(1,063)
Total equity	5,705,735	5,413,516
Excess stock, $.01 par value, 150,000,000 shares authorized, none issued or outstanding
Preferred stock, $.01 par value, 50,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value, 250,000,000 shares authorized, 150,794,602 and 148,186,511 issued and 150,715,702 and 148,107,611 outstanding at June 30, 2012 and December 31, 2011, respectively	1,507	1,481
Additional paid-in capital	5,184,710	4,936,457
Dividends in excess of earnings	(34,463)	(53,080)
Treasury common stock at cost, 78,900 shares at June 30, 2012 and December 31, 2011	(2,722)	(2,722)
Accumulated other comprehensive loss	(14,978)	(16,138)
Total stockholders' equity attributable to Boston Properties, Inc.	5,134,054	4,865,998
Total liabilities and equity	$ 15,280,629	$ 14,782,966

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Unsecured Exchangeable Senior Notes (Narrative) (Detail) (2.875% Exchangeable Senior Notes [Member], USD $)	1 Months Ended			6 Months Ended
	Feb. 15, 2012	Feb. 16, 2012	Feb. 20, 2012	Jun. 30, 2012	Jan. 10, 2012
2.875% Exchangeable Senior Notes [Member]
Coupon/Stated Rate					2.875%
Debt instrument repurchase date by company				Feb. 15, 2012
Put Right expiration date				Feb. 08, 2012
Notes redemption date				Feb. 20, 2012
Debt instrument in connection with redemption last day to exchange notes				Feb. 16, 2012
Debt instrument redemption price percentage of principal		100.00%	100.00%
Amount paid for repurchase	$ 242,735,000		$ 333,459,000

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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Dividends in Excess of Earnings [Member]	Treasury Stock, at Cost [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Equity, value at Dec. 31, 2010	$ 4,964,193	$ 1,402	$ 4,417,162	$ (24,763)	$ (2,722)	$ (18,436)	$ 591,550
Equity, shares at Dec. 31, 2010		140,199,000
Conversion of operating partnership units to Common Stock, shares		1,650,000
Conversion of operating partnership units to Common Stock, value		17	47,534				(47,551)
Allocated net income for the year	116,267			100,949			15,318
Dividends/distributions declared	(165,503)			(145,723)			(19,780)
Sale of common stock, net of offering costs, shares		4,229,000
Sale of common stock, net of offering costs, value	394,717	42	394,675
Shares issued pursuant to stock purchase plan, shares		4,000
Shares issued pursuant to stock purchase plan, value	312		312
Net activity from stock option and incentive plan, shares		305,000
Net activity from stock option and incentive plan, value	26,260	3	12,950				13,307
Distributions to noncontrolling interests in property partnerships	(1,000)						(1,000)
Amortization of interest rate contracts	1,297					1,142	155
Reallocation of noncontrolling interest			(26,630)				26,630
Equity, value at Jun. 30, 2011	5,336,543	1,464	4,846,003	(69,537)	(2,722)	(17,294)	578,629
Equity, shares at Jun. 30, 2011		146,387,000
Equity, value at Dec. 31, 2011	5,413,516	1,481	4,936,457	(53,080)	(2,722)	(16,138)	547,518
Equity, shares at Dec. 31, 2011	148,107,611	148,108,000
Conversion of operating partnership units to Common Stock, shares		227,000
Conversion of operating partnership units to Common Stock, value		2	6,829				(6,831)
Conversion of redeemable preferred units to common units	4,115						4,115
Allocated net income for the year	207,190			183,672			23,518
Dividends/distributions declared	(185,155)			(165,055)			(20,100)
Sale of common stock, net of offering costs, shares		2,348,000
Sale of common stock, net of offering costs, value	247,186	24	247,162
Shares issued pursuant to stock purchase plan, shares		4,000
Shares issued pursuant to stock purchase plan, value	381		381
Net activity from stock option and incentive plan, shares		29,000
Net activity from stock option and incentive plan, value	18,705		4,032				14,673
Distributions to noncontrolling interests in property partnerships	(1,500)						(1,500)
Amortization of interest rate contracts	1,297					1,160	137
Reallocation of noncontrolling interest			(10,151)				10,151
Equity, value at Jun. 30, 2012	$ 5,705,735	$ 1,507	$ 5,184,710	$ (34,463)	$ (2,722)	$ (14,978)	$ 571,681
Equity, shares at Jun. 30, 2012	150,715,702	150,716,000

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Real Estate Activity During The Six Months Ended June 30, 2012 (Summary Of Estimated Amortization Of The Acquired Above Market Leases (Net Of Acquired Below Market Leases) And The Acquired In-Place Lease Intangibles) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Acquired In-Place Lease Intangibles [Member]
Restructuring Cost and Reserve [Line Items]
Period from July 1, 2012 through December 31, 2012	$ 5,080
2013	10,084
2014	7,869
2015	5,927
2016	5,199
Acquired Net Below-Market Lease Intangibles [Member]
Restructuring Cost and Reserve [Line Items]
Period from July 1, 2012 through December 31, 2012	1,864
2013	3,709
2014	3,374
2015	2,885
2016	$ 2,512

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

6 Months Ended

Jun. 30, 2012

Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value

	June 30, 2012					December 31, 2011
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	2,877,125		$	2,985,393	$	3,123,267		$	3,297,903
Unsecured senior notes		4,863,413			5,236,475		3,865,186			4,148,461
Unsecured exchangeable senior notes		1,155,669	(1)		1,328,569		1,715,685	(1)		1,904,115
Total	$	8,896,207		$	9,550,437	$	8,704,138		$	9,350,479

(1) Includes the net impact of Accounting Standards Codification (“ASC”) ASC 470-20 totaling approximately $39.5 million and $54.5 million at June 30, 2012 and December 31, 2011, respectively.

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Real Estate Activity During The Six Months Ended June 30, 2012 (Pro Forma In Connection With Acquisition) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Total revenue	$ 932,251	$ 882,090
Income from continuing operations	155,514	122,989
Net income attributable to Boston Properties, Inc.	$ 185,751	$ 105,242
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$ 1.24	$ 0.73
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$ 1.24	$ 0.73

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Investments in Unconsolidated Joint Ventures (Tables)

6 Months Ended

Jun. 30, 2012

Investments In Unconsolidated Joint Ventures

Entity	Properties	Nominal % Ownership
Square 407 Limited Partnership	Market Square North		50.0	%
The Metropolitan Square Associates LLC	Metropolitan Square		51.0	%
BP/CRF 901 New York Avenue LLC	901 New York Avenue		25.0	%(1)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure		33.3	%(2)
RBP Joint Venture LLC	Eighth Avenue and 46th Street		50.0	%(3)
Boston Properties Office Value-Added Fund, L.P.	300 Billerica Road and Mountain View Research and Technology Parks		37.6	%(1)(4)
Annapolis Junction NFM, LLC	Annapolis Junction		50.0	%(5)
767 Venture, LLC	The General Motors Building		60.0	%
2 GCT Venture LLC	Two Grand Central Tower		60.0	%(6)
540 Madison Venture LLC	540 Madison Avenue		60.0	%
125 West 55th Street Venture LLC	125 West 55th Street		60.0	%
500 North Capitol LLC	500 North Capitol Street, NW		30.0	%(7)

(1) The Company’s economic ownership can increase based on the achievement of certain return thresholds.

(2) The Company’s wholly-owned entity that owns the office component of the project owns a 33.3% interest in the entity owning the land and infrastructure of the project.

(3) This property is not in operation and consists of assembled land.

(4) Represents the Company’s effective ownership interest. The Company has a 25.0% interest in the 300 Billerica Road property and a 39.5% interest in the Mountain View Research and Technology Park properties.

(5) Comprised of one building, one building under construction and two undeveloped land parcels.

(6) The property was sold on October 25, 2011. As of June 30, 2012, the investment is comprised of working capital and a portion of the sale proceeds.

(7) This property is under construction.

Balance Sheets Of The Unconsolidated Joint Ventures

	June 30, 2012			December 31, 2011
	(in thousands)
ASSETS
Real estate and development in process, net	$	4,519,909		$	4,542,594
Other assets		675,191			668,113
Total assets	$	5,195,100		$	5,210,707
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	3,018,423		$	2,988,894
Other liabilities		822,672			854,257
Members’/Partners’ equity		1,354,005			1,367,556
Total liabilities and members’/partners’ equity	$	5,195,100		$	5,210,707
Company’s share of equity	$	799,513		$	799,479
Basis differentials(1)		(128,860	)		(129,757	)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	670,653		$	669,722

(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

	For the three months ended June 30,					For the six months  ended June 30,
	2012		2011			2012		2011
	(in thousands)
Total revenue(1)	$	156,035	$	144,987		$	295,135	$	290,632
Expenses
Operating		39,261		42,272			78,153		85,114
Depreciation and amortization		42,679		48,243			84,578		98,880
Total expenses		81,940		90,515			162,731		183,994
Operating income		74,095		54,472			132,404		106,638
Other expense
Interest expense		55,909		57,007			111,271		114,768
Net income (loss)	$	18,186	$	(2,535	)	$	21,133	$	(8,130	)
Company’s share of net income (loss)	$	10,641	$	(2,284	)	$	12,012	$	(5,339	)
Basis differential		431		1,759			897		3,515
Elimination of inter-entity interest on partner loan		10,119		9,407			20,003		18,682
Income from unconsolidated joint ventures	$	21,191	$	8,882		$	32,912	$	16,858

(1) Includes straight-line rent adjustments of $2.8 million and $4.0 million for the three months ended June 30, 2012 and 2011, respectively, and $7.1 million and $8.1 million for the six months ended June 30, 2012 and 2011, respectively. Includes net below-market rent adjustments of $23.2 million and $29.2 million for the three months ended June 30, 2012 and 2011, respectively, and $48.5 million and $58.7 million for the six months ended June 30, 2012 and 2011, respectively. Total revenue for the three and six months ended June 30, 2012 includes termination income totaling approximately $19.6 million (of which the Company’s share is approximately $11.8 million) related to a lease termination with a tenant at the General Motors Building.

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 208,756	$ 117,932
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	221,623	220,508
Non-cash compensation expense	18,113	17,765
Income from unconsolidated joint ventures	(32,912)	(16,858)
Distributions of net cash flow from operations of unconsolidated joint ventures	20,190	17,442
Gains from investments in securities	(615)	(379)
Non-cash portion of interest expense	21,881	27,014
Settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes	(68,760)
Gains from early extinguishments of debt	(1,196)
Gain on sale of real estate from discontinued operations	(36,877)
Gain on forgiveness of debt from discontinued operations	(17,807)
Change in assets and liabilities:
Cash held in escrows	8,675	(4,408)
Tenant and other receivables, net	30,120	16,346
Accrued rental income, net	(39,598)	(49,195)
Prepaid expenses and other assets	38,618	(6,505)
Accounts payable and accrued expenses	(2,710)	169
Accrued interest payable	(4,977)	(281)
Other liabilities	(7,589)	(28,517)
Tenant leasing costs	(23,855)	(20,932)
Total adjustments	122,324	172,169
Net cash provided by operating activities	331,080	290,101
Cash flows from investing activities:
Acquisitions of real estate	(621,359)	(41,100)
Construction in progress	(152,548)	(137,258)
Building and other capital improvements	(21,569)	(13,390)
Tenant improvements	(72,786)	(28,290)
Proceeds from the sale of real estate	61,963
Proceeds from land transaction		43,887
Deposit on real estate released from escrow		10,000
Issuance of notes receivable	(1,974)	(6,375)
Capital contributions to unconsolidated joint ventures	(325)	(16,716)
Capital distributions from unconsolidated joint ventures	3,057
Investments in securities, net	(873)	(864)
Net cash used in investing activities	(806,414)	(190,106)
Cash flows from financing activities:
Proceeds from mortgage notes payable		453,306
Repayments of mortgage notes payable	(219,865)	(468,639)
Proceeds from unsecured senior notes	997,790
Redemption/repurchase of unsecured exchangeable senior notes	(507,434)
Deposit on mortgage loan financing		(14,500)
Deferred financing costs	(7,758)	(6,220)
Net proceeds from ATM stock issuances	247,186	394,717
Net proceeds from equity transactions	973	8,807
Dividends and distributions	(185,269)	(164,830)
Distributions to noncontrolling interest in property partnership	(1,500)	(1,000)
Net cash provided by financing activities	324,123	201,641
Net increase (decrease) in cash and cash equivalents	(151,211)	301,636
Cash and cash equivalents, beginning of period	1,823,208	478,948
Cash and cash equivalents, end of period	1,671,997	780,584
Supplemental disclosures:
Cash paid for interest	276,494	190,851
Interest capitalized	21,278	23,197
Non-cash investing and financing activities:
Additions to real estate included in accounts payable	3,225	19,154
Mortgage note payable assumed in connection with the acquisition of real estate		143,900
Mortgage note payable extinguished through foreclosure	25,000
Real estate transferred upon foreclosure	8,198
Dividends and distributions declared but not paid	93,353	83,369
Conversions of noncontrolling interests to stockholders' equity	6,831	47,551
Conversion of redeemable preferred units to common units	4,115
Issuance of restricted securities to employees and directors	$ 25,955	$ 25,087

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Tenant and other receivables, allowance for doubtful accounts	$ 1,834	$ 1,766
Accrued rental income, allowance	2,693	2,515
Unsecured senior notes, discount	11,587	9,814
Unsecured exchangeable senior notes, discount	$ 2,368	$ 3,462
Excess stock, par value	$ 0.01	$ 0.01
Excess stock, shares authorized	150,000,000	150,000,000
Excess stock, shares issued	0	0
Excess stock, shares outstanding	0	0
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	150,794,602	148,186,511
Common stock, shares outstanding	150,715,702	148,107,611
Treasury common stock at cost, shares	78,900	78,900

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Stockholders' Equity

6 Months Ended

Jun. 30, 2012

Stockholders' Equity

10. Stockholders’ Equity

As of June 30, 2012, the Company had 150,715,702 shares of Common Stock outstanding.

During the six months ended June 30, 2012, the Company utilized its $600 million “at the market” (“ATM”) stock offering program to issue an aggregate of 2,347,500 shares of Common Stock for gross proceeds of approximately $249.8 million and net proceeds of approximately $247.2 million. As of June 30, 2012, approximately $305.3 million remained available for issuance under this ATM program.

During the six months ended June 30, 2012, the Company issued 22,823 shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees.

During the six months ended June 30, 2012, the Company issued 225,835 shares of Common Stock in connection with the redemption of an equal number of OP Units.

On January 27, 2012, the Company paid a dividend in the amount of $0.55 per share of Common Stock to shareholders of record as of the close of business on December 31, 2011. On April 30, 2012, the Company paid a dividend in the amount of $0.55 per share of Common Stock to shareholders of record as of the close of business on March 30, 2012. On June 15, 2012, the Company’s Board of Directors declared a dividend in the amount of $0.55 per share of Common Stock payable on July 31, 2012 to shareholders of record as of the close of business on June 29, 2012.

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Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Aug. 02, 2012
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Trading Symbol	BXP
Entity Registrant Name	BOSTON PROPERTIES INC
Entity Central Index Key	0001037540
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		150,762,982

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Earnings Per Share

6 Months Ended

Jun. 30, 2012

Earnings Per Share

11. 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. As a result, the Series Two Preferred Units are considered participating securities and are included in the computation of basic and diluted earnings per share of the Company if the effect of applying the if-converted method is dilutive. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of EPS pursuant to the two-class method. As a result, unvested restricted common stock of the Company, LTIP Units and OPP Units are considered participating securities and are included in the computation of basic and diluted earnings per share of the Company if the effect of applying the if-converted method is dilutive. Because the OPP 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 June 30, 2012
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	85,889		150,312	$	0.57
Discontinued operations attributable to Boston Properties, Inc.		33,181		—		0.22
Net income attributable to Boston Properties, Inc.	$	119,070		150,312	$	0.79
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		382		—
Diluted Earnings:
Net income	$	119,070		150,694	$	0.79

	For the Three Months Ended June 30, 2011
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	60,331			145,864	$	0.41
Discontinued operations attributable to Boston Properties, Inc.		(117	)		—		—
Net income attributable to Boston Properties, Inc.	$	60,214			145,864	$	0.41
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			831		—
Diluted Earnings:
Net income	$	60,214			146,695	$	0.41

	For the six months ended June 30, 2012
	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	134,219		149,328	$	0.90
Discontinued operations attributable to Boston Properties, Inc.		49,453		—		0.33
Net income attributable to Boston Properties, Inc.	$	183,672		149,328	$	1.23
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—		392		—
Diluted Earnings:
Net income	$	183,672		149,720	$	1.23

	For the Six Months Ended June 30, 2011
	Income (Numerator)			Shares (Denominator)		Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Income from continuing operations attributable to Boston Properties, Inc.	$	101,019			143,990	$	0.70
Discontinued operations attributable to Boston Properties, Inc.		(70	)		—		—
Net income attributable to Boston Properties, Inc.	$	100,949			143,990	$	0.70
Effect of Dilutive Securities:
Stock Based Compensation and Exchangeable Senior Notes		—			620		—
Diluted Earnings:
Net income	$	100,949			144,610	$	0.70

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue
Base rent	$ 372,285	$ 346,515	$ 728,376	$ 684,122
Recoveries from tenants	57,475	48,255	109,222	93,495
Parking and other	23,524	21,098	45,951	40,159
Total rental revenue	453,284	415,868	883,549	817,776
Hotel revenue	10,049	8,904	16,865	14,852
Development and management services	9,564	9,095	17,710	16,521
Total revenue	472,897	433,867	918,124	849,149
Expenses
Rental	161,853	143,633	318,299	282,524
Hotel	6,616	6,281	12,715	12,020
General and administrative	19,066	18,721	46,685	43,364
Transaction costs	8	1,361	2,112	1,433
Depreciation and amortization	111,643	110,259	220,583	218,852
Total expenses	299,186	280,255	600,394	558,193
Operating income	173,711	153,612	317,730	290,956
Other income (expense)
Income from unconsolidated joint ventures	21,191	8,882	32,912	16,858
Interest and other income	2,382	1,953	4,028	2,927
Gains (losses) from investments in securities	(186)	6	615	379
Gains from early extinguishments of debt	274		1,041
Interest expense	(99,901)	(94,583)	(203,138)	(193,108)
Income from continuing operations	97,471	69,870	153,188	118,012
Discontinued operations
Income (loss) from discontinued operations	398	(132)	884	(80)
Gain on sale of real estate from discontinued operations	36,877		36,877
Gain on forgiveness of debt from discontinued operations			17,807
Net income	134,746	69,738	208,756	117,932
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnership	(457)	(503)	(1,003)	(1,032)
Noncontrolling interest-redeemable preferred units of the Operating Partnership	(765)	(842)	(1,566)	(1,665)
Noncontrolling interest-common units of the Operating Partnership	(10,360)	(8,194)	(16,400)	(14,296)
Noncontrolling interest in discontinued operations-common units of the Operating Partnership	(4,094)	15	(6,115)	10
Net income attributable to Boston Properties, Inc.	$ 119,070	$ 60,214	$ 183,672	$ 100,949
Basic earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations	$ 0.57	$ 0.41	$ 0.90	$ 0.70
Discontinued operations	$ 0.22		$ 0.33
Net income	$ 0.79	$ 0.41	$ 1.23	$ 0.70
Weighted average number of common shares outstanding	150,312	145,864	149,328	143,990
Diluted earnings per common share attributable to Boston Properties, Inc.:
Income from continuing operations	$ 0.57	$ 0.41	$ 0.90	$ 0.70
Discontinued operations	$ 0.22		$ 0.33
Net income	$ 0.79	$ 0.41	$ 1.23	$ 0.70
Weighted average number of common and common equivalent shares outstanding	150,694	146,695	149,720	144,610

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Mortgage Notes Payable

6 Months Ended

Jun. 30, 2012

Mortgage Notes Payable

5. Mortgage Notes Payable

On January 31, 2012, the servicer of the non-recourse mortgage loan collateralized by the Company’s Montvale Center property located in Gaithersburg, Maryland foreclosed on the property. During 2011, the Company had notified the master servicer of the non-recourse mortgage loan that the cash flows generated from the property were insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and that the Company was not prepared to fund any cash shortfalls. The Company was not current on making debt service payments and was accruing interest at the default interest rate of 9.93% per annum. The loan was originally scheduled to mature on June 6, 2012. As a result of the foreclosure, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate and working capital to the servicer. The Company no longer has any equitable or economic ownership interest in the property. The transaction resulted in a gain on forgiveness of debt of approximately $17.8 million. The operating results of the property through the date of foreclosure have been classified as discontinued operations on a historical basis for all periods presented (See Note 3).

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

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

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Investments in Unconsolidated Joint Ventures

6 Months Ended

Jun. 30, 2012

Investments in Unconsolidated Joint Ventures

4. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at June 30, 2012:

Entity	Properties	Nominal % Ownership
Square 407 Limited Partnership	Market Square North		50.0	%
The Metropolitan Square Associates LLC	Metropolitan Square		51.0	%
BP/CRF 901 New York Avenue LLC	901 New York Avenue		25.0	%(1)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure		33.3	%(2)
RBP Joint Venture LLC	Eighth Avenue and 46th Street		50.0	%(3)
Boston Properties Office Value-Added Fund, L.P.	300 Billerica Road and Mountain View Research and Technology Parks		37.6	%(1)(4)
Annapolis Junction NFM, LLC	Annapolis Junction		50.0	%(5)
767 Venture, LLC	The General Motors Building		60.0	%
2 GCT Venture LLC	Two Grand Central Tower		60.0	%(6)
540 Madison Venture LLC	540 Madison Avenue		60.0	%
125 West 55th Street Venture LLC	125 West 55th Street		60.0	%
500 North Capitol LLC	500 North Capitol Street, NW		30.0	%(7)

(1) The Company’s economic ownership can increase based on the achievement of certain return thresholds.

(2) The Company’s wholly-owned entity that owns the office component of the project owns a 33.3% interest in the entity owning the land and infrastructure of the project.

(3) This property is not in operation and consists of assembled land.

(4) Represents the Company’s effective ownership interest. The Company has a 25.0% interest in the 300 Billerica Road property and a 39.5% interest in the Mountain View Research and Technology Park properties.

(5) Comprised of one building, one building under construction and two undeveloped land parcels.

(6) The property was sold on October 25, 2011. As of June 30, 2012, the investment is comprised of working capital and a portion of the sale proceeds.

(7) This property is under construction.

Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures at an agreed upon fair value. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

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

	June 30, 2012			December 31, 2011
	(in thousands)
ASSETS
Real estate and development in process, net	$	4,519,909		$	4,542,594
Other assets		675,191			668,113
Total assets	$	5,195,100		$	5,210,707
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable	$	3,018,423		$	2,988,894
Other liabilities		822,672			854,257
Members’/Partners’ equity		1,354,005			1,367,556
Total liabilities and members’/partners’ equity	$	5,195,100		$	5,210,707
Company’s share of equity	$	799,513		$	799,479
Basis differentials(1)		(128,860	)		(129,757	)
Carrying value of the Company’s investments in unconsolidated joint ventures	$	670,653		$	669,722

(1) This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.

The combined summarized statements of operations of the joint ventures are as follows:

	For the three months ended June 30,					For the six months  ended June 30,
	2012		2011			2012		2011
	(in thousands)
Total revenue(1)	$	156,035	$	144,987		$	295,135	$	290,632
Expenses
Operating		39,261		42,272			78,153		85,114
Depreciation and amortization		42,679		48,243			84,578		98,880
Total expenses		81,940		90,515			162,731		183,994
Operating income		74,095		54,472			132,404		106,638
Other expense
Interest expense		55,909		57,007			111,271		114,768
Net income (loss)	$	18,186	$	(2,535	)	$	21,133	$	(8,130	)
Company’s share of net income (loss)	$	10,641	$	(2,284	)	$	12,012	$	(5,339	)
Basis differential		431		1,759			897		3,515
Elimination of inter-entity interest on partner loan		10,119		9,407			20,003		18,682
Income from unconsolidated joint ventures	$	21,191	$	8,882		$	32,912	$	16,858

(1) Includes straight-line rent adjustments of $2.8 million and $4.0 million for the three months ended June 30, 2012 and 2011, respectively, and $7.1 million and $8.1 million for the six months ended June 30, 2012 and 2011, respectively. Includes net below-market rent adjustments of $23.2 million and $29.2 million for the three months ended June 30, 2012 and 2011, respectively, and $48.5 million and $58.7 million for the six months ended June 30, 2012 and 2011, respectively. Total revenue for the three and six months ended June 30, 2012 includes termination income totaling approximately $19.6 million (of which the Company’s share is approximately $11.8 million) related to a lease termination with a tenant at the General Motors Building.

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Real Estate Activity During the Six Months Ended June 30, 2012 (Tables)

6 Months Ended

Jun. 30, 2012

Estimated Amortization Of The Acquired Above-Market Leases (Net Of Acquired Below-Market Leases) And The Acquired In-Place Lease Intangibles

	Acquired In-Place Lease Intangibles		Acquired Net  Below- Market Lease Intangibles
Period from July 1, 2012 through December 31, 2012	$	5,080	$	1,864
2013		10,084		3,709
2014		7,869		3,374
2015		5,927		2,885
2016		5,199		2,512

Pro Forma In Connection With Acquisition

Pro Forma	Six months ended June 30,
(in thousands, except per share data)	2012		2011
Total revenue	$	932,251	$	882,090
Income from continuing operations	$	155,514	$	122,989
Net income attributable to Boston Properties, Inc.	$	185,751	$	105,242
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	1.24	$	0.73
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	1.24	$	0.73

Summary Of The Discontinued Operations Related To Montvale And Bedford Office Park

	For the three months ended June 30,						For the six months ended June 30,
	2012			2011			2012			2011
	(in thousands)
Total revenue	$	1,091		$	2,584		$	3,748		$	5,177
Expenses
Operating		450			1,242			1,602			2,322
Depreciation and amortization		243			821			1,040			1,656
Total expenses		693			2,063			2,642			3,978
Operating income		398			521			1,106			1,199
Other expense
Interest expense		—			(653	)		(222	)		(1,279	)
Income (loss) from discontinued operations	$	398		$	(132	)	$	884		$	(80	)
Noncontrolling interest in income (loss) from discontinued operations – common units of the Operating Partnership		(42	)		15			(94	)		10
Income (loss) from discontinued operations attributable to Boston Properties, Inc.	$	356		$	(117	)	$	790		$	(70	)
Gain on sale of real estate from discontinued operations	$	36,877		$	—		$	36,877		$	—
Gain on forgiveness of debt from discontinued operations		—			—			17,807			—
Noncontrolling interest in gain on sale of real estate and gain on forgiveness of debt from discontinued operations – common units of the Operating Partnership		(4,052	)		—			(6,021	)		—
Gain on sale of real estate and gain on forgiveness of debt from discontinued operations attributable to Boston Properties, Inc.	$	32,825		$	—		$	48,663		$	—

453 Ravendale Drive [Member]

Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition

Land	$	5,477
Building and improvements		974
Tenant improvements		116
In-place lease intangibles		223
Below-market rents		(140	)
Net assets acquired	$	6,650

100 Federal Street [Member]

Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition

Land	$	131,067
Building and improvements		387,321
Tenant improvements		48,633
In-place lease intangibles		69,530
Above-market rents		81
Other assets		4,800
Below-market rents		(22,515	)
Accounts payable and accrued expenses		(3,917	)
Net assets acquired	$	615,000

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Stock Option and Incentive Plan

6 Months Ended

Jun. 30, 2012

Stock Option and Incentive Plan

12. Stock Option and Incentive Plan

On January 25, 2012, the Compensation Committee of the Board of Directors of the Company approved outperformance awards under the Company’s 1997 Stock Option and Incentive Plan (the “1997 Plan”) to certain officers of the Company. These awards (the “2012 OPP Awards”) are part of a broad-based, long-term incentive compensation program designed to provide the Company’s management team with the potential to earn equity awards subject to the Company “outperforming” and creating shareholder value in a pay-for-performance structure. 2012 OPP Awards utilize total return to shareholders (“TRS”) over a three-year measurement period as the performance metric and include two years of time-based vesting after the end of the performance measurement period (subject to acceleration in certain events) as a retention tool. Recipients of 2012 OPP Awards will share in an outperformance pool if the Company’s TRS, including both share appreciation and dividends, exceeds absolute and relative hurdles over a three-year measurement period from February 7, 2012 to February 6, 2015, based on the average closing price of a share of the Company’s common stock of $106.69 for the five trading days prior to and including February 7, 2012. The aggregate reward that recipients of all 2012 OPP Awards can earn, as measured by the outperformance pool, is subject to a maximum cap of $40.0 million.

The outperformance pool will consist of (i) two percent (2%) of the excess total return above a cumulative absolute TRS hurdle of 24% over the full three-year measurement period (equivalent to 8% per annum) (the “Absolute TRS Component”) and (ii) two percent (2%) of the excess or deficient excess total return above or below a relative TRS hurdle equal to the total return of the SNL Equity REIT Index over the three-year measurement period (the “Relative TRS Component”). In the event that the Relative TRS Component is potentially positive because the Company’s TRS is greater than the total return of the SNL Equity REIT Index, but the Company achieves a cumulative absolute TRS below 24% over the three-year measurement period (equivalent to 8% per annum), the actual contribution to the outperformance pool from the Relative TRS Component will be subject to a sliding scale factor as follows: (i) 100% of the potential Relative TRS Component will be earned if the Company’s TRS is equal to or greater than a cumulative 24% over three years, (ii) 0% will be earned if the Company’s TRS is 0% or less, and (iii) a percentage from 0% to 100% calculated by linear interpolation will be earned if the Company’s cumulative TRS over three years is between 0% and 24%. For example, if the Company achieves a cumulative absolute TRS of 18% over the full three-year measurement period (equivalent to a 6% absolute annual TRS), the potential Relative TRS Component would be prorated by 75%. The potential Relative TRS Component before application of the sliding scale factor will be capped at $40.0 million. In the event that the Relative TRS Component is negative because the Company’s TRS is less than the total return of the SNL Equity REIT Index, any outperformance reward potentially earned under the Absolute TRS Component will be reduced dollar for dollar, provided that the potential Absolute TRS Component before reduction for any negative Relative TRS Component will be capped at $40.0 million. The algebraic sum of the Absolute TRS Component and the Relative TRS Component determined as described above will never exceed $40.0 million.

Each employee’s 2012 OPP Award was designated as a specified percentage of the aggregate outperformance pool. Assuming the applicable absolute and/or relative TRS thresholds are achieved at the end of the measurement period, the algebraic sum of the Absolute TRS Component and the Relative TRS Component will be calculated and then allocated among the 2012 OPP Award recipients in accordance with each individual’s percentage. If there is a change of control prior to February 6, 2015, the measurement period will end on the change of control date and both the Absolute TRS Component (using a prorated absolute TRS hurdle) and the Relative TRS Component will be calculated and, assuming the applicable absolute and/or relative TRS thresholds are achieved over the shorter measurement period, allocated among the 2012 OPP Award recipients as of that date.

Rewards earned with respect to 2012 OPP Awards (if any) will vest 25% on February 7, 2015, 25% on February 7, 2016 and 50% on February 7, 2017, based on continued employment. Vesting will be accelerated in the event of a change in control of the Company, termination of employment without cause, termination of employment by the award recipient for good reason, death, disability or retirement, although restrictions on transfer will continue to apply in certain of these situations. All determinations, interpretations and assumptions relating to the calculation of performance and vesting relating to 2012 OPP Awards will be made by the Compensation Committee. 2012 OPP Awards will be in the form of LTIP Units. LTIP Units will be issued prior to the determination of the outperformance pool, but will remain subject to forfeiture depending on the extent of rewards earned with respect to 2012 OPP Awards. The number of LTIP Units issued initially to recipients of the 2012 OPP Awards is an estimate of the maximum number of LTIP Units that they could earn, based on certain assumptions. The number of LTIP Units actually earned by each award recipient will be determined at the end of the performance measurement period by dividing his or her share of the outperformance pool by the average closing price of a REIT Share for the 15 trading days immediately preceding the measurement date. Total return for the Company and for the SNL Equity REIT Index over the three-year measurement period and other circumstances will determine how many LTIP Units are earned by each recipient; if they are fewer than the number issued initially, the balance will be forfeited as of the performance measurement date. Prior to the measurement date, LTIP units issued on account of 2012 OPP Awards 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 LTIP Units, both vested and unvested, which 2012 OPP Award recipients have earned based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit. LTIP Units are designed to qualify as “profits interests” in the Operating Partnership for federal income tax purposes. As a general matter, the profits interests characteristics of the LTIP Units mean that initially they will not be economically equivalent in value to an OP Unit. If and when events specified by applicable tax regulations occur, LTIP Units can over time increase in value up to the point where they are equivalent to OP Units on a one-for-one basis. After LTIP Units are fully vested, and to the extent the special tax rules applicable to profits interests have allowed them to become equivalent in value to OP Units, LTIP Units may be converted on a one-for-one basis into OP Units. OP Units in turn have a one-for-one relationship in value with Boston Properties, Inc. common stock, and are exchangeable on such one-for-one basis for cash or, at the election of the Company, Boston Properties, Inc. common stock.

The 2012 OPP Units were valued, in accordance with ASC 718 “Compensation—Stock Compensation,” at an aggregate of approximately $7.7 million utilizing a Monte Carlo simulation to estimate the probability of the performance vesting conditions being satisfied. The Monte Carlo simulation used a statistical formula underlying the Black-Scholes and binomial formulas and such simulation was run approximately 100,000 times. For each simulation, the payoff is calculated at the settlement date, which is then discounted to the award date at a risk-free interest rate. The average of the values over all simulations is the expected value of the unit on the award date. Assumptions used in the valuations included (1) factors associated with the underlying performance of the Company’s stock price and total shareholder return over the term of the performance awards including total stock return volatility and risk-free interest and (2) factors associated with the relative performance of the Company’s stock price and total shareholder return when compared to the SNL Equity REIT Index. The valuation was performed in a risk-neutral framework, so no assumption was made with respect to an equity risk premium. The fair value of the 2012 OPP Units is based on the sum of: (1) the present value of the expected payoff to the OPP Award on the measurement date, if the TRS over the applicable measurement period exceeds performance hurdles of the Absolute and the Relative Components; and (2) the present value of the distributions payable on the 2012 OPP Units. The ultimate reward realized on account of the OPP Award by the holders of the 2012 OPP Units is contingent on the TRS achieved on the measurement date, both in absolute terms and relative to the TRS of the SNL Equity REIT Index. The per unit fair value of each 2012 OPP Unit was estimated on the date of grant using the following assumptions in the Monte Carlo valuation: expected price volatility for the Company and the SNL Equity REIT index of 31% and 30%, respectively; a risk free rate of 0.35%; and total dividend payments over the measurement period of $7.28 per share.

On February 13, 2012, E. Mitchell Norville announced that he would resign as Executive Vice President, Chief Operating Officer of the Company effective on February 29, 2012. In connection with his resignation, Mr. Norville entered into a separation agreement (the “Separation Agreement”) with the Company. Under the Separation Agreement, the Company agreed to pay Mr. Norville cash payments totaling approximately $1,533,333 (less applicable deductions) in addition to his cash bonus for 2011, which was $950,000. In addition, Mr. Norville agreed to provide consulting services to the Company for at least two months following the effective date of his resignation for which he received $20,000 per month. Under the Separation Agreement, Mr. Norville is entitled to accelerated vesting with respect to 23,502 LTIP units in the Operating Partnership and stock options to purchase 4,464 shares of common stock at an exercise price of $92.71 and 5,117 shares of common stock at an exercise price of $104.47. Mr. Norville will also retain approximately 36% of his 2011 outperformance award, which will remain subject to the performance-based vesting criteria originally established for the 2011 outperformance awards. Mr. Norville agreed to one-year non-competition, non-solicitation and non-interference provisions, and provided the Company with a general release of claims. The Company recognized approximately $4.5 million of expense during the six months ended June 30, 2012 in connection with Mr. Norville’s resignation.

At the Company’s 2012 annual meeting of stockholders held on May 15, 2012, the stockholders of the Company approved the Boston Properties, Inc. 2012 Stock Option and Incentive Plan (the “2012 Plan”). The 2012 Plan replaces the 1997 Plan. The material terms of the 2012 Plan include, among other things: (1) the maximum number of shares of common stock reserved and available for issuance under the 2012 Plan is the sum of (i) 13,000,000 newly authorized shares, plus (ii) the number of shares available for grant under the 1997 Stock Plan immediately prior to the effective date of the 2012 Plan, plus (iii) any shares underlying grants under the 1997 Plan that are forfeited, cancelled or are terminated (other than by exercise) in the future; (2) “full-value” awards (i.e., awards other than stock options) are multiplied by a 2.32 conversion ratio to calculate the number of shares available under the 2012 Plan that are used for each full-value award, as opposed to a 1.0 conversion ratio for each stock option awarded under the 2012 Plan; (3) shares tendered or held back for taxes will not be added back to the reserved pool under the 2012 Plan; (4) stock options may not be re-priced without stockholder approval; and (5) the term of the 2012 Plan is for ten years from the date of stockholder approval.

During the six months ended June 30, 2012, the Company issued 20,756 shares of restricted common stock, 186,007 non-qualified stock options, 174,650 LTIP Units and 400,000 2012 OPP Units to employees and non-employee directors under the 1997 Plan and 2012 Plan. Employees and directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and OPP 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 six months ended June 30, 2012 were valued at approximately $2.2 million ($107.31 per share weighted-average). The non-qualified stock options granted during the six months ended June 30, 2012 had a weighted-average fair value on the date of grant of $19.50 per option, which was computed using the Black-Scholes option-pricing model utilizing the following weighted-average assumptions: an expected life of 5.4 years, a risk-free interest rate of 0.92%, an expected price volatility of 28.4% and an expected dividend yield of 2.9%. The weighted-average exercise price of the options is $107.23, which was the weighted-average closing price of the Company’s common stock on the date of grant. The LTIP Units granted during the six months ended June 30, 2012 were valued at approximately $17.3 million ($98.83 per unit fair value weighted-average) using a Monte Carlo simulation method model. The weighted-average per unit fair value of each LTIP Unit granted was estimated on the date of grant using the following assumptions: an expected life of 5.8 years, a risk-free interest rate of 0.94% and an expected price volatility of 29.1%. As the 2011 OPP Awards and 2012 OPP Awards are subject to both a service condition and a market condition, the Company recognizes the compensation expense related to the 2011 OPP Awards and 2012 OPP Awards under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in the Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, non-qualified stock options, LTIP Units, 2008 OPP Units, 2011 OPP Units and 2012 OPP Units was approximately $6.4 million and $5.6 million for the three months ended June 30, 2012 and 2011, respectively, and approximately $17.4 million and $17.2 million for the six months ended June 30, 2012 and 2011, respectively. For the six months ended June 30, 2012, stock-based compensation expense includes approximately $2.7 million consisting of the acceleration of vesting of the Company’s Chief Operating Officer’s stock-based compensation awards associated with his resignation. Upon the conclusion of the three-year measurement period in February 2011, the 2008 OPP Awards were not earned, the program was terminated and the Company accelerated the then remaining unrecognized compensation expense totaling approximately $4.3 million during the six months ended June 30, 2011. At June 30, 2012, there was $29.4 million of unrecognized compensation expense related to unvested restricted stock and LTIP Units and $10.4 million of unrecognized compensation expense related to unvested 2011 OPP Units and 2012 OPP Units that is expected to be recognized over a weighted-average period of approximately 2.8 years.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies

8. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence.

The Company has letter of credit and performance obligations of approximately $16.4 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. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

In connection with the assumption of the General Motors Building’s secured loan by the Company’s unconsolidated joint venture, 767 Venture, LLC, the Company guaranteed the unconsolidated joint venture’s obligation to fund various escrows, including tenant improvements, taxes and insurance in lieu of cash deposits. As of June 30, 2012, the maximum funding obligation under the guarantee was approximately $20.2 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.

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.

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”). Currently, the Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism certified under TRIA other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billion of coverage in the Company’s property insurance program which is provided by IXP, LLC (“IXP”) as a direct insurer. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage, with $1.375 billion of Terrorism Coverage in excess of $250 million being provided by

NYXP, LLC (“NYXP”), as a direct insurer. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIA (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in our portfolio, including 767 Fifth Avenue, but excluding the properties owned by the Company’s Value-Added Fund and certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the additional Terrorism Coverage provided by IXP for 601 Lexington Avenue, the NBCR Coverage provided by IXP and the Terrorism Coverage provided by NYXP are backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” The program trigger is $100.0 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that the Company believes are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically, the Company currently carries earthquake insurance which covers its San Francisco region 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 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 on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.

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

The mortgages on the Company’s properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identity of the insurance companies in the Company’s insurance programs. The ratings of some of the Company’s insurers are below the rating requirements in some of the Company’s loan agreements and the lenders for these loans could attempt to claim 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 or the presence of mold at the Company’s properties, 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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Unsecured Senior Notes

6 Months Ended

Jun. 30, 2012

Unsecured Senior Notes

6. Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Principal Amount			Maturity Date(2)
10 Year Unsecured Senior Notes		6.250	%		6.381	%	$	182,432		January 15, 2013(3)
10 Year Unsecured Senior Notes		6.250	%		6.291	%		42,568		January 15, 2013(3)
12 Year Unsecured Senior Notes		5.625	%		5.693	%		300,000		April 15, 2015
12 Year Unsecured Senior Notes		5.000	%		5.194	%		250,000		June 1, 2015
10 Year Unsecured Senior Notes		5.875	%		5.967	%		700,000		October 15, 2019
10 Year Unsecured Senior Notes		5.625	%		5.708	%		700,000		November 15, 2020
10 Year Unsecured Senior Notes		4.125	%		4.289	%		850,000		May 15, 2021
7 Year Unsecured Senior Notes		3.700	%		3.853	%		850,000		November 15, 2018
11 Year Unsecured Senior Notes		3.850	%		3.954	%		1,000,000		February 1, 2023
Total principal								4,875,000
Net unamortized discount								(11,587	)
Total							$	4,863,413

(1) Yield on issuance date including the effects of discounts on the notes.

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

(3) On July 25, 2012, the Company’s Operating Partnership issued notice to redeem these notes on August 24, 2012 (See Note 14).

On June 11, 2012, the Company’s Operating Partnership completed a public offering of $1.0 billion in aggregate principal amount of its 3.850% senior unsecured notes due 2023. The notes were priced at 99.779% of the principal amount to yield an effective rate (including financing fees) of 3.954% to maturity. The notes will mature on February 1, 2023, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $989.4 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At June 30, 2012, the Company was in compliance with each of these financial restrictions and requirements.

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Unsecured Exchangeable Senior Notes

6 Months Ended

Jun. 30, 2012

Unsecured Exchangeable Senior Notes

7. Unsecured Exchangeable Senior Notes

The following summarizes the unsecured exchangeable senior notes outstanding as of June 30, 2012 (dollars in thousands):

	Coupon/ Stated Rate			Effective Rate(1)			Exchange Rate			Principal Amount			First Optional Redemption Date by the Company			Maturity Date
3.625% Exchangeable Senior Notes		3.625	%		4.037	%		8.5051	(2)	$	747,500			N/A		February 15, 2014
3.750% Exchangeable Senior Notes		3.750	%		3.787	%		10.0066	(3)		450,000			May 18, 2013	(4)	May 15, 2036
Total principal											1,197,500
Net unamortized discount											(2,368	)
Adjustment for the equity component allocation, net of accumulated amortization											(39,463	)
Total										$	1,155,669

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

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustment), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. As of June 30, 2012, the effective exchange price was $134.94 per share.

(3) In connection with the special distribution of $5.98 per share of Boston Properties, Inc.’s common stock declared on December 17, 2007, the exchange rate was adjusted from 9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately$99.93 per share of Boston Properties, Inc.’s common stock.

(4) Holders may require the Operating Partnership to repurchase the notes for cash on May 18, 2013 and on May 15 of 2016, 2021, 2026 and 2031 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to 100% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date.

On January 10, 2012, the Company announced that holders of the 2.875% Exchangeable Senior Notes due 2037 (the “Notes”) issued by its Operating Partnership had the right to surrender their Notes for purchase by the Operating Partnership (the “Put Right”) on February 15, 2012. The opportunity to exercise the Put Right expired at 5:00 p.m., New York City time, on February 8, 2012. On January 10, 2012, the Company also announced that the Operating Partnership issued a notice of redemption to the holders of the Notes to redeem, on February 20, 2012 (the “Redemption Date”), all of the Notes outstanding on the Redemption Date. In connection with the redemption, holders of the Notes had the right to exchange their Notes prior to 5:00 p.m., New York City time, on February 16, 2012. Notes with respect to which the Put Right was not exercised (or with respect to which the Put Right was exercised and subsequently withdrawn prior to the withdrawal deadline) and that were not surrendered for exchange prior to 5:00 p.m., New York City time, on February 16, 2012, were redeemed by the Operating Partnership on the Redemption Date 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. Holders of an aggregate of $242,735,000 of the Notes exercised the Put Right and the Operating Partnership repurchased such Notes on February 15, 2012. On February 20, 2012, the Operating Partnership redeemed the remaining $333,459,000 of outstanding Notes at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon.

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Noncontrolling Interests

6 Months Ended

Jun. 30, 2012

Noncontrolling Interests

9. Noncontrolling Interests

Noncontrolling interests relate to the interests in the Operating Partnership not owned by the Company and interests in property partnerships not wholly-owned by the Company. As of June 30, 2012, the noncontrolling interests consisted of 16,514,469 OP Units, 1,683,214 LTIP Units, 400,000 2011 OPP Units, 400,000 2012 OPP Units and 1,030,748 Series Two Preferred Units (or 1,352,688 OP Units on an as converted basis) held by parties other than the Company.

Noncontrolling Interest—Redeemable Preferred Units of the Operating Partnership

The Preferred Units at June 30, 2012 consisted solely of 1,030,748 Series Two Preferred Units, which bear a preferred distribution equal to the greater of (1) the distribution which would have been paid in respect of the Series Two Preferred Unit had such Series Two Preferred Unit been converted into an OP Unit (including both regular and special distributions) or (2) 6.00% per annum on a liquidation preference of $50.00 per unit, and are convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). The holders of Series Two Preferred Units have the right to require the Operating Partnership to redeem their units for cash at the redemption price of $50.00 per unit on May 14, 2013 and May 12, 2014. The maximum number of units that may be required to be redeemed from all holders on each of these dates is 1,007,662, which is one-sixth of the number of Series Two Preferred Units that were originally issued. The holders also had the right to have their Series Two Preferred Units redeemed for cash on May 12, 2009, May 12, 2010, May 12, 2011 and May 14, 2012, although no holder exercised such right. The Company also has the right, subject to certain conditions, to redeem Series Two Preferred Units for cash or to convert into OP Units any Series Two Preferred Units that are not redeemed when they are eligible for redemption.

On February 5, 2012, 82,296 Series Two Preferred Units of the Operating Partnership were converted by the holders into 108,000 OP Units. In addition, the Company paid the accrued preferred distributions due to the holders of Preferred Units that were converted.

On February 15, 2012, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.75616 per unit. On May 15, 2012, the Operating Partnership paid a distribution on its outstanding Series Two Preferred Units of $0.73151 per unit.

The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the six months ended June 30, 2012 and 2011 (in thousands):

Balance at January 1, 2012	$	55,652
Net income		1,566
Distributions		(1,566	)
Conversion of redeemable preferred units to common units		(4,115	)
Balance at June 30, 2012	$	51,537
Balance at January 1, 2011	$	55,652
Net income		1,665
Distributions		(1,665	)
Balance at June 30, 2011	$	55,652

Noncontrolling Interest—Common Units of the Operating Partnership

During the six months ended June 30, 2012, 225,835 OP Units were presented by the holders for redemption (including 108,000 OP Units issued upon conversion of Series Two Preferred Units and 67,256 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 June 30, 2012, the Company had outstanding 400,000 2011 OPP Units and 400,000 2012 OPP Units (See Note 12). Prior to the measurement date (January 31, 2014 for 2011 OPP Units and February 6, 2015 for 2012 OPP Units), holders of OPP 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, both vested and unvested, that OPP award recipients have earned, if any, based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit.

On January 27, 2012, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.55 per unit, and a distribution on the 2011 OPP Units in the amount of $0.055 per unit, to holders of record as of the close of business on December 31, 2011. On April 30, 2012, the Operating Partnership paid a distribution on the OP Units and LTIP Units in the amount of $0.55 per unit, and a distribution on the 2011 OPP Units and 2012 OPP Units in the amount of $0.055 per unit, to holders of record as of the close of business on March 30, 2012. On June 15, 2012, Boston Properties, Inc., as general partner of the Operating Partnership, declared a distribution on the OP Units and LTIP Units in the amount of $0.55 per unit and a distribution on the 2011 OPP Units and 2012 OPP Units in the amount of $0.055 per unit, in each case payable on July 31, 2012 to holders of record as of the close of business on June 29, 2012.

The Series Two Preferred Units may be converted into OP Units at the election of the holder thereof at any time. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit for cash equal to the then value of a share of common stock of the Company. The Company may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (not owned by the Company and including LTIP Units assuming that all conditions had been met for the conversion thereof) and Series Two Preferred Units (on an as converted basis) had all of such units been redeemed at June 30, 2012 was approximately $1.97 billion and $146.6 million, respectively, based on the closing price of the Company’s common stock of $108.37 per share on June 30, 2012.

Noncontrolling Interest—Property Partnerships

The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $(1.6) million at June 30, 2012 and approximately $(1.1) million at December 31, 2011, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

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Real Estate Activity During The Six Months Ended June 30, 2012 (Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 13, 2012 100 Federal Street [Member]	Mar. 01, 2012 453 Ravendale Drive [Member]
Land	$ 131,067	$ 5,477
Building and improvements	387,321	974
Tenant improvements	48,633	116
In-place lease intangibles	69,530	223
Above-market rents	81
Other assets	4,800
Below-market rents	(22,515)	(140)
Accounts payable and accrued expenses	(3,917)
Net assets acquired	$ 615,000	$ 6,650

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Noncontrolling Interests (Property Partnerships) (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property partnerships	$ (1,560)	$ (1,063)

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Subsequent Events

6 Months Ended

Jun. 30, 2012

Subsequent Events

14. Subsequent Events

On July 13, 2012, the Company executed an agreement to form a joint venture, which upon closing will own and operate Fountain Square, an approximately 811,000 net rentable square foot office and retail complex located in Reston, Virginia, adjacent to the Company’s other Reston properties. The joint venture partner will contribute the property valued at approximately $385.0 million and related mortgage indebtedness totaling approximately $211.3 million for a 50% interest in the joint venture. The Company expects to contribute cash totaling approximately $87.0 million for its 50% interest, which cash will be distributed to the joint venture partner. The Company expects to consolidate this joint venture. The mortgage loan bears interest at fixed rate of 5.71% per annum and matures on October 11, 2016. Pursuant to the joint venture agreement (i) the Company has rights to acquire the partner’s 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.

On July 25, 2012, the Company’s Operating Partnership issued notice to redeem the remaining $225.0 million in aggregate principal amount of its 6.25% senior notes due 2013 on August 24, 2012. The Company expects to fund this redemption using available cash. The redemption price will equal the sum of (i) 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 (ii) accrued interest to, but excluding, August 24, 2012, 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 August 24, 2012 in accordance with the terms of the applicable indenture.

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Unsecured Exchangeable Senior Notes (Tables)

6 Months Ended

Jun. 30, 2012

Schedule of Unsecured Exchangeable Senior Notes

	Coupon/ Stated Rate			Effective Rate(1)			Exchange Rate			Principal Amount			First Optional Redemption Date by the Company			Maturity Date
3.625% Exchangeable Senior Notes		3.625	%		4.037	%		8.5051	(2)	$	747,500			N/A		February 15, 2014
3.750% Exchangeable Senior Notes		3.750	%		3.787	%		10.0066	(3)		450,000			May 18, 2013	(4)	May 15, 2036
Total principal											1,197,500
Net unamortized discount											(2,368	)
Adjustment for the equity component allocation, net of accumulated amortization											(39,463	)
Total										$	1,155,669

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

(2) The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.’s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call transactions were intended to increase the effective exchange price to the Company of the notes from $117.58 to approximately $137.17 per share (subject to adjustment), representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of $97.98 per share of Boston Properties, Inc.’s common stock. The net cost of the capped call transactions was approximately $44.4 million. As of June 30, 2012, the effective exchange price was $134.94 per share.

(3) In connection with the special distribution of $5.98 per share of Boston Properties, Inc.’s common stock declared on December 17, 2007, the exchange rate was adjusted from 9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately$99.93 per share of Boston Properties, Inc.’s common stock.

(4) Holders may require the Operating Partnership to repurchase the notes for cash on May 18, 2013 and on May 15 of 2016, 2021, 2026 and 2031 and at any time prior to their maturity upon a fundamental change, in each case at a price equal to 100% of the principal amount of the notes being repurchased plus any accrued and unpaid interest up to, but excluding, the repurchase date.

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Noncontrolling Interests (Redeemable Preferred Units) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance			$ 55,652	$ 55,652
Net income	765	842	1,566	1,665
Distributions			(1,566)	(1,665)
Conversion of redeemable preferred units to common units			(4,115)
Balance	$ 51,537	$ 55,652	$ 51,537	$ 55,652

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Mortgage Notes Payable (Narrative) (Detail) (USD $)	3 Months Ended	6 Months Ended					6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Montvale Center [Member]	Jun. 30, 2012 Bay Colony Corporate Center [Member]	Mar. 12, 2012 Bay Colony Corporate Center [Member]	Jun. 30, 2012 One Freedom Square [Member]	Apr. 02, 2012 One Freedom Square [Member]
Mortgage Notes Payable [Line Items]
Debt default, accrued interest rate				9.93%
Amount of debt extinguished				$ 25,000,000
Maturity Date				Jun. 06, 2012	Jun. 11, 2012		Jun. 30, 2012
Gain on forgiveness of debt from discontinued operations		17,807,000		17,807,000
Repayments of mortgage notes payable		219,865,000	468,639,000		143,900,000		65,100,000
Interest at a fixed rate						6.53%		7.75%
Penalty for early repayment of debt					0		0
Gains from early extinguishments of debt	$ 274,000	$ 1,041,000			$ 900,000		$ 300,000

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 134,746	$ 69,738	$ 208,756	$ 117,932
Other comprehensive income:
Amortization of interest rate contracts	648	648	1,297	1,297
Other comprehensive income	648	648	1,297	1,297
Comprehensive income	135,394	70,386	210,053	119,229
Net income attributable to noncontrolling interests	(15,676)	(9,524)	(25,084)	(16,983)
Other comprehensive income attributable to noncontrolling interests	(68)	(75)	(137)	(155)
Comprehensive income attributable to Boston Properties, Inc.	$ 119,650	$ 60,787	$ 184,832	$ 102,091

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Real Estate Activity During the Six Months Ended June 30, 2012

6 Months Ended

Jun. 30, 2012

Real Estate Activity During the Six Months Ended June 30, 2012

3. Real Estate Activity During the Six Months Ended June 30, 2012

Acquisitions

On March 1, 2012, the Company acquired 453 Ravendale Drive located in Mountain View, California for a purchase price of approximately $6.7 million in cash. 453 Ravendale Drive is an approximately 30,000 net rentable square foot Office/Technical property. The following table summarizes the allocation of the aggregate purchase price of 453 Ravendale Drive at the date of acquisition (in thousands).

Land	$	5,477
Building and improvements		974
Tenant improvements		116
In-place lease intangibles		223
Below-market rents		(140	)
Net assets acquired	$	6,650

On March 13, 2012, the Company acquired 100 Federal Street in Boston, Massachusetts for an aggregate investment of approximately $615.0 million in cash. In connection with the transaction, the Company entered into a long-term lease with an affiliate of Bank of America for approximately 735,000 square feet. 100 Federal Street is an approximately 1,264,000 net rentable square foot, 37-story Class A office tower located in Boston, Massachusetts. The following table summarizes the allocation of the aggregate purchase price of 100 Federal Street at the date of acquisition (in thousands).

Land	$	131,067
Building and improvements		387,321
Tenant improvements		48,633
In-place lease intangibles		69,530
Above-market rents		81
Other assets		4,800
Below-market rents		(22,515	)
Accounts payable and accrued expenses		(3,917	)
Net assets acquired	$	615,000

The following table summarizes the estimated amortization of the acquired in-place lease intangibles and the acquired net below-market lease intangibles for 453 Ravendale Drive and 100 Federal Street, collectively, for each of the five succeeding years (in thousands).

	Acquired In-Place Lease Intangibles		Acquired Net  Below- Market Lease Intangibles
Period from July 1, 2012 through December 31, 2012	$	5,080	$	1,864
2013		10,084		3,709
2014		7,869		3,374
2015		5,927		2,885
2016		5,199		2,512

100 Federal Street contributed approximately $19.5 million of revenue and approximately $3.3 million of earnings to the Company for the period from March 13, 2012 through June 30, 2012. 453 Ravendale Drive contributed approximately $0.2 million of revenue and approximately $40,000 of earnings to the Company for the period from March 1, 2012 through June 30, 2012.

The accompanying pro forma information for the six months ended June 30, 2012 and 2011 is presented as if the acquisitions of (1) 453 Ravendale Drive on March 1, 2012 and (2) 100 Federal Street on March 13, 2012, had occurred on January 1, 2011. This pro forma information is based upon the historical consolidated financial statements and should be read in conjunction with the consolidated financial statements and notes thereto. This pro forma information does not purport to represent what the actual results of operations of the Company would have been had the above occurred, nor do they purport to predict the results of operations of future periods.

Pro Forma	Six months ended June 30,
(in thousands, except per share data)	2012		2011
Total revenue	$	932,251	$	882,090
Income from continuing operations	$	155,514	$	122,989
Net income attributable to Boston Properties, Inc.	$	185,751	$	105,242
Basic earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	1.24	$	0.73
Diluted earnings per share:
Net income per share attributable to Boston Properties, Inc.	$	1.24	$	0.73

Developments

On January 3, 2012, the Company commenced the redevelopment of Two Patriots Park, a Class A office project with approximately 256,000 net rentable square feet located in Reston, Virginia. The Company will capitalize incremental costs during the redevelopment.

On April 30, 2012, the Company fully placed in-service 510 Madison Avenue, a Class A office project with approximately 356,000 net rentable square feet located in New York City.

On May 4, 2012, the Company completed and fully placed in-service One Patriots Park, a Class A office redevelopment project with approximately 268,000 net rentable square feet located in Reston, Virginia.

Dispositions

On January 31, 2012, the servicer of the non-recourse mortgage loan collateralized by the Company’s Montvale Center property located in Gaithersburg, Maryland foreclosed on the property. During 2011, the Company had notified the master servicer of the non-recourse mortgage loan that the cash flows generated from the property were insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and that the Company was not prepared to fund any cash shortfalls. The Company was not current on making debt service payments and was accruing interest at the default interest rate of 9.93% per annum. The loan was originally scheduled to mature on June 6, 2012. As a result of the foreclosure, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate and working capital to the servicer. The Company no longer has any equitable or economic ownership interest in the property. The transaction resulted in a gain on forgiveness of debt of approximately $17.8 million. The operating results of the property through the date of foreclosure have been classified as discontinued operations on a historical basis for all periods presented.

On May 17, 2012, the Company completed the sale of its Bedford Business Park properties located in Bedford, Massachusetts for approximately $62.8 million in cash. Net cash proceeds totaled approximately $62.0 million, resulting in a gain on sale of approximately $36.9 million. Bedford Business Park is comprised of two Office/Technical buildings and one Class A office building aggregating approximately 470,000 net rentable square feet.

The following table summarizes the income (loss) from discontinued operations related to Montvale Center and Bedford Business Park and the related gain on sale of real estate and gain on forgiveness of debt for the three and six months ended June 30, 2012 and 2011:

	For the three months ended June 30,						For the six months ended June 30,
	2012			2011			2012			2011
	(in thousands)
Total revenue	$	1,091		$	2,584		$	3,748		$	5,177
Expenses
Operating		450			1,242			1,602			2,322
Depreciation and amortization		243			821			1,040			1,656
Total expenses		693			2,063			2,642			3,978
Operating income		398			521			1,106			1,199
Other expense
Interest expense		—			(653	)		(222	)		(1,279	)
Income (loss) from discontinued operations	$	398		$	(132	)	$	884		$	(80	)
Noncontrolling interest in income (loss) from discontinued operations – common units of the Operating Partnership		(42	)		15			(94	)		10
Income (loss) from discontinued operations attributable to Boston Properties, Inc.	$	356		$	(117	)	$	790		$	(70	)
Gain on sale of real estate from discontinued operations	$	36,877		$	—		$	36,877		$	—
Gain on forgiveness of debt from discontinued operations		—			—			17,807			—
Noncontrolling interest in gain on sale of real estate and gain on forgiveness of debt from discontinued operations – common units of the Operating Partnership		(4,052	)		—			(6,021	)		—
Gain on sale of real estate and gain on forgiveness of debt from discontinued operations attributable to Boston Properties, Inc.	$	32,825		$	—		$	48,663		$	—

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Subsequent Events (Detail) (USD $)		1 Months Ended	0 Months Ended
	Jun. 30, 2012	Jul. 25, 2012 Subsequent Event [Member] Six Point Two Five Percent Senior Note Due 2013 [Member]	Jul. 13, 2012 Fountain Square [Member] Subsequent Event [Member] sqft
Net rentable square feet			811,000
Acquisition aggregate purchase price			$ 385,000,000
Mortgage loan on acquisition of property			211,300,000
Percentage of ownership interest			50.00%
Interest on mortgage loan paid in cash			87,000,000
Interest at a fixed rate		6.25%	5.71%
Mortgage loan maturity date			Oct. 01, 2016
Partner's interest acquisition price			102,000,000
Fixed price option rights expiry date			Jan. 31, 2016
Aggregate principal amount	$ 1,197,500,000	$ 225,000,000
Percentage found in make whole provision		0.35%

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Noncontrolling Interests (Tables)

6 Months Ended

Jun. 30, 2012

Noncontrolling Interests - Redeemable Preferred Units

The following table reflects the activity of the noncontrolling interests—redeemable preferred units of the Operating Partnership for the six months ended June 30, 2012 and 2011 (in thousands):

Balance at January 1, 2012	$	55,652
Net income		1,566
Distributions		(1,566	)
Conversion of redeemable preferred units to common units		(4,115	)
Balance at June 30, 2012	$	51,537
Balance at January 1, 2011	$	55,652
Net income		1,665
Distributions		(1,665	)
Balance at June 30, 2011	$	55,652

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Investments In Unconsolidated Joint Ventures (Investments In Unconsolidated Joint Ventures) (Detail)	6 Months Ended
	Jun. 30, 2012 Property
Entity Owning Land And Infrastructure Of Project [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	33.30%
300 Billerica Road [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	25.00%
Mountain View Research And Technology Park [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	39.50%
Annapolis Junction NFM, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Annapolis Junction The General Motors
Nominal % Ownership	50.00%	[1]
Number of buildings	1
Number of buildings in under construction	1
Number Of Undeveloped Land Parcels	2
Square 407 Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Market Square North
Nominal % Ownership	50.00%
The Metropolitan Square Associates LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Metropolitan Square
Nominal % Ownership	51.00%
BP/CRF 901 New York Avenue LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	901 New York Avenue
Nominal % Ownership	25.00%	[2]
WP Project Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Wisconsin Place Land and Infrastructure
Nominal % Ownership	33.30%	[3]
RBP Joint Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Eighth Avenue and 46th Street
Nominal % Ownership	50.00%	[4]
Boston Properties Office Value-Added Fund, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Properties	300 Billerica Road and Mountain View Research and Technology Parks
Nominal % Ownership	37.60%	[2],[5]
767 Venture, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Building
Nominal % Ownership	60.00%
2 GCT Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Two Grand Central Tower
Nominal % Ownership	60.00%	[6]
540 Madison Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	540 Madison Avenue
Nominal % Ownership	60.00%
125 West 55th Street Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	125 West 55thStreet 500 North Capitol
Nominal % Ownership	60.00%
500 North Capitol LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties	Street, NW
Nominal % Ownership	30.00%	[7]

[1] Comprised of one building, one building under construction and two undeveloped land parcels.

[2] The Company's economic ownership can increase based on the achievement of certain return thresholds.

[3] The Company's wholly-owned entity that owns the office component of the project owns a 33.3% interest in the entity owning the land and infrastructure of the project.

[4] This property is not in operation and consists of assembled land.

[5] Represents the Company's effective ownership interest. The Company has a 25.0% interest in the 300 Billerica Road property and a 39.5% interest in the Mountain View Research and Technology Park properties.

[6] The property was sold on October 25, 2011. As of June 30, 2012, the investment is comprised of working capital and a portion of the sale proceeds.

[7] This property is under construction.

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Segment Information

6 Months Ended

Jun. 30, 2012

Segment Information

13. Segment Information

The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by both geographic area and property type. The Company’s segments by geographic area are Boston, New York, Princeton, San Francisco and Washington, DC. Segments by property type include: Class A Office, Office/Technical, Residential and Hotel.

Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Interest and other income, development and management services, general and administrative expenses, transaction costs, interest expense, depreciation and amortization expense, gains (losses) from investments in securities, gains from early extinguishments of debt, income from unconsolidated joint ventures, discontinued operations and noncontrolling interests are not included in Net Operating Income as internal reporting addresses these items on a corporate level.

Net Operating Income is not a measure of operating results or cash flows from operating activities as measured by accounting principles generally accepted in the United States of America, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity. All companies may not calculate Net Operating Income in the same manner. The Company considers Net Operating Income to be an appropriate supplemental measure to net income because it helps both investors and management to understand the core operations of the Company’s properties.

Information by geographic area and property type (dollars in thousands):

For the three months ended June 30, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	157,642		$	122,657		$	15,617		$	53,650		$	88,740		$	438,306
Office/Technical		5,744			—			—			144			4,054			9,942
Residential		1,013			—			—			—			4,023			5,036
Hotel		10,049			—			—			—			—			10,049
Total		174,448			122,657			15,617			53,794			96,817			463,333
% of Grand Totals		37.65	%		26.47	%		3.37	%		11.61	%		20.90	%		100.0	%
Rental Expenses:
Class A Office		60,504			38,936			7,691			21,188			28,306			156,625
Office/Technical		1,652			—			—			38			964			2,654
Residential		367			—			—			—			2,207			2,574
Hotel		6,616			—			—			—			—			6,616
Total		69,139			38,936			7,691			21,226			31,477			168,469
% of Grand Totals		41.04	%		23.11	%		4.57	%		12.60	%		18.68	%		100.0	%
Net operating income	$	105,309		$	83,721		$	7,926		$	32,568		$	65,340		$	294,864
% of Grand Totals		35.71	%		28.39	%		2.69	%		11.05	%		22.16	%		100.0	%

For the three months ended June 30, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	135,505		$	113,407		$	15,811		$	54,168		$	86,114		$	405,005
Office/Technical		6,337			—			—			—			3,950			10,287
Residential		—			—			—			—			576			576
Hotel		8,904			—			—			—			—			8,904
Total		150,746			113,407			15,811			54,168			90,640			424,772
% of Grand Totals		35.49	%		26.70	%		3.72	%		12.75	%		21.34	%		100.0	%
Rental Expenses:
Class A Office		50,772			37,378			7,487			20,118			24,365			140,120
Office/Technical		1,779			—			—			—			1,011			2,790
Residential		—			—			—			—			723			723
Hotel		6,281			—			—			—			—			6,281
Total		58,832			37,378			7,487			20,118			26,099			149,914
% of Grand Totals		39.25	%		24.93	%		4.99	%		13.42	%		17.41	%		100.0	%
Net operating income	$	91,914		$	76,029		$	8,324		$	34,050		$	64,541		$	274,858
% of Grand Totals		33.44	%		27.66	%		3.03	%		12.39	%		23.48	%		100.0	%

For the six months ended June 30, 2012:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	298,650		$	240,246		$	30,467		$	105,847		$	179,137		$	854,347
Office/Technical		11,343			—			—			196			8,146			19,685
Residential		1,896			—			—			—			7,621			9,517
Hotel		16,865			—			—			—			—			16,865
Total		328,754			240,246			30,467			106,043			194,904			900,414
% of Grand Totals		36.51	%		26.68	%		3.38	%		11.78	%		21.65	%		100.0	%
Rental Expenses:
Class A Office		118,337			77,443			15,049			41,209			55,747			307,785
Office/Technical		3,152			—			—			62			2,011			5,225
Residential		757			—			—			—			4,532			5,289
Hotel		12,715			—			—			—			—			12,715
Total		134,961			77,443			15,049			41,271			62,290			331,014
% of Grand Totals		40.77	%		23.39	%		4.55	%		12.47	%		18.82	%		100.0	%
Net operating income	$	193,793		$	162,803		$	15,418		$	64,772		$	132,614		$	569,400
% of Grand Totals		34.03	%		28.59	%		2.71	%		11.38	%		23.29	%		100.0	%

For the six months ended June 30, 2011:

	Boston			New York			Princeton			San Francisco			Washington, DC			Total
Rental Revenue:
Class A Office	$	262,302		$	226,414		$	32,090		$	107,061		$	168,795		$	796,662
Office/Technical		12,596			—			—			—			7,942			20,538
Residential		—			—			—			—			576			576
Hotel		14,852			—			—			—			—			14,852
Total		289,750			226,414			32,090			107,061			177,313			832,628
% of Grand Totals		34.80	%		27.19	%		3.85	%		12.86	%		21.30	%		100.0	%
Rental Expenses:
Class A Office		98,542			75,092			15,402			39,452			47,533			276,021
Office/Technical		3,647			—			—			—			2,133			5,780
Residential		—			—			—			—			723			723
Hotel		12,020			—			—			—			—			12,020
Total		114,209			75,092			15,402			39,452			50,389			294,544
% of Grand Totals		38.77	%		25.50	%		5.23	%		13.39	%		17.11	%		100.0	%
Net operating income	$	175,541		$	151,322		$	16,688		$	67,609		$	126,924		$	538,084
% of Grand Totals		32.62	%		28.12	%		3.10	%		12.57	%		23.59	%		100.0	%

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

	Three months ended June 30,					Six months ended June 30,
	2012		2011			2012			2011
Net Operating Income	$	294,864	$	274,858		$	569,400		$	538,084
Add:
Development and management services income		9,564		9,095			17,710			16,521
Income from unconsolidated joint ventures		21,191		8,882			32,912			16,858
Interest and other income		2,382		1,953			4,028			2,927
Gains from early extinguishments of debt		274		—			1,041			—
Income (loss) from discontinued operations		398		(132	)		884			(80	)
Gain on sale of real estate from discontinued operations		36,877		—			36,877			—
Gain on forgiveness of debt from discontinued operations		—		—			17,807			—
Less:
General and administrative expense		19,066		18,721			46,685			43,364
Transaction costs		8		1,361			2,112			1,433
Depreciation and amortization expense		111,643		110,259			220,583			218,852
Interest expense		99,901		94,583			203,138			193,108
Losses (gains) from investments in securities		186		(6	)		(615	)		(379	)
Noncontrolling interest in property partnerships		457		503			1,003			1,032
Noncontrolling interest—redeemable preferred units of the Operating Partnership		765		842			1,566			1,665
Noncontrolling interest—common units of the Operating Partnership		10,360		8,194			16,400			14,296
Noncontrolling interest in discontinued operations—common units of the Operating Partnership		4,094		(15	)		6,115			(10	)
Net income attributable to Boston Properties, Inc.	$	119,070	$	60,214		$	183,672		$	100,949