Biomed Realty Trust Inactive 10-Q6 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_Entity_Information

Document Entity Information	9 Months Ended
Document Entity Information	Sep. 30, 2013	Nov. 06, 2013
Entity Information [Line Items]	'	'
Entity Registrant Name	'BioMed Realty Trust Inc	'
Entity Central Index Key	'0001289236	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	192,111,755
BIOMED REALTY, L.P.	'	'
Entity Information [Line Items]	'	'
Entity Registrant Name	'BioMed Realty L P	'
Entity Central Index Key	'0001301932	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments in real estate, net	$5,172,102	$4,319,716
Investments in unconsolidated partnerships	31,978	32,367
Parent Company	'	'
Investments in real estate, net	5,172,102	4,319,716
Investments in unconsolidated partnerships	31,978	32,367
Cash and cash equivalents	29,230	19,976
Accounts receivable, net	10,580	4,507
Accrued straight-line rents, net	169,272	152,096
Deferred leasing costs, net	202,393	172,363
Other assets	278,600	133,454
Total assets	5,894,155	4,834,479
Liabilities [Abstract]	'	'
Mortgage notes payable, net	716,733	571,652
Exchangeable senior notes	180,000	180,000
Unsecured senior notes, net	894,850	894,177
Unsecured senior term loans	755,226	405,456
Unsecured line of credit	20,000	118,000
Accounts payable, accrued expenses and other liabilities	311,287	180,653
Total liabilities	2,878,096	2,349,938
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]	'	'
Preferred stock, $.01 par value, 15,000,000 shares authorized: 7.375% Series A cumulative redeemable preferred stock, no shares issued and outstanding at September 30, 2013; and 7,920,000 shares issued and outstanding at December 31, 2012, $198,000 liquidation preference ($25.00 per share)	'	191,469
Common stock, $.01 par value, 250,000,000 shares authorized, 192,106,749 shares issued and outstanding at September 30, 2013; and 200,000,000 shares authorized, 154,327,818 shares issued and outstanding at December 31, 2012	1,921	1,543
Additional paid-in capital	3,552,595	2,781,849
Accumulated other comprehensive loss, net	-38,618	-54,725
Dividends in excess of earnings	-545,819	-443,280
Total stockholders' equity	2,970,079	2,476,856
Noncontrolling interests / Noncontrolling interests deficit	45,980	7,685
Total equity / capital	3,016,059	2,484,541
Total liabilities and equity / capital	5,894,155	4,834,479
BIOMED REALTY, L.P.	'	'
Investments in real estate, net	5,172,102	4,319,716
Investments in unconsolidated partnerships	31,978	32,367
Cash and cash equivalents	29,230	19,976
Accounts receivable, net	10,580	4,507
Accrued straight-line rents, net	169,272	152,096
Deferred leasing costs, net	202,393	172,363
Other assets	278,600	133,454
Total assets	5,894,155	4,834,479
Liabilities [Abstract]	'	'
Mortgage notes payable, net	716,733	571,652
Exchangeable senior notes	180,000	180,000
Unsecured senior notes, net	894,850	894,177
Unsecured senior term loans	755,226	405,456
Unsecured line of credit	20,000	118,000
Accounts payable, accrued expenses and other liabilities	311,287	180,653
Total liabilities	2,878,096	2,349,938
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]	'	'
Preferred units, 7.375% Series A cumulative redeemable preferred units, no units issued and outstanding at September 30, 2013; and 7,920,000 units issued and outstanding at December 31, 2012, $198,000 liquidation preference ($25.00 per unit)	'	191,469
Limited partners' capital, 5,415,974 and 2,932,758 units issued and outstanding at September 30, 2013 and December 31, 2012, respectively	46,498	7,937
General partner's capital, 192,106,749 and 154,327,818 units issued and outstanding at September 30, 2013 and December 31, 2012, respectively	3,005,434	2,338,464
Accumulated other comprehensive loss, net	-35,355	-53,077
Total partners' capital	3,016,577	2,484,793
Noncontrolling interests / Noncontrolling interests deficit	-518	-252
Total equity / capital	3,016,059	2,484,541
Total liabilities and equity / capital	$5,894,155	$4,834,479

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Parent Company	'	'
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred Stock Liquidation Preference Total	'	$198,000,000
Preferred Stock, Liquidation Preference Per Share	$25	$25
Preferred Stock, Shares Issued	'	7,920,000
Preferred Stock, Shares Outstanding	'	7,920,000
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	250,000,000	200,000,000
Common Stock, Shares, Issued	192,106,749	154,327,818
BIOMED REALTY, L.P.	'	'
Limited Partners' Capital Account, Units Issued	5,415,974	2,932,758
Limited Partners' Capital Account, Units Outstanding	5,415,974	2,932,758
General Partners' Capital Account, Units Issued	192,106,749	154,327,818
General Partners' Capital Account, Units Outstanding	192,106,749	154,327,818
Common Stock \| Parent Company	'	'
Common Stock, Shares Outstanding	192,106,749	154,327,818

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
Consolidated Statements of Operations (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:	'	'	'	'
Total revenues	$18,700,000	'	$27,000,000	'
Expenses:	'	'	'	'
Equity in net loss of unconsolidated partnerships	-112,000	-339,000	-697,000	-1,011,000
Net income / (loss)	-512,000	'	12,000	'
Parent Company	'	'	'	'
Revenues:	'	'	'	'
Rental	116,884,000	101,467,000	327,932,000	288,650,000
Tenant recoveries	38,907,000	31,765,000	104,037,000	89,155,000
Other revenue	3,441,000	1,305,000	47,352,000	1,590,000
Total revenues	159,232,000	134,537,000	479,321,000	379,395,000
Expenses:	'	'	'	'
Rental operations	51,688,000	38,944,000	134,182,000	112,717,000
Depreciation and amortization	61,898,000	51,372,000	186,219,000	143,882,000
General and administrative	11,934,000	10,226,000	32,358,000	27,416,000
Acquisition-related expenses	907,000	176,000	5,263,000	13,055,000
Total expenses	126,427,000	100,718,000	358,022,000	297,070,000
Income from operations	32,805,000	33,819,000	121,299,000	82,325,000
Equity in net loss of unconsolidated partnerships	-112,000	-339,000	-697,000	-1,011,000
Interest expense, net	-27,870,000	-26,817,000	-79,890,000	-72,863,000
Other expense	-687,000	-208,000	-4,079,000	-580,000
Income / (loss) from continuing operations	4,136,000	6,455,000	36,633,000	7,871,000
Income / (loss) from discontinued operations	'	'	'	-4,370,000
Net income / (loss)	4,136,000	6,455,000	36,633,000	3,501,000
Net (income) / loss attributable to noncontrolling interests	111,000	-46,000	-268,000	156,000
Net income / (loss) attributable to the Company/Operating Partnership	4,247,000	6,409,000	36,365,000	3,657,000
Preferred stock dividends / unit distributions	'	-3,651,000	-2,393,000	-10,952,000
Cost on redemption of preferred stock / units	'	'	-6,531,000	'
Net income / (loss) available to common stockholders/unitholders	4,247,000	2,758,000	27,441,000	-7,295,000
Income / (loss) from continuing operations per share / unit available to common stockholders / unitholders	$0.02	$0.02	$0.15	($0.02)
Loss from discontinued operations per share / unit available to common stockholders / unitholders	'	'	'	($0.03)
Net income / (loss) per share / unit available to common stockholders / unitholders	$0.02	$0.02	$0.15	($0.05)
Weighted Average Number of Shares Outstanding, Basic	190,646,722	152,785,451	179,138,169	152,739,130
Weighted Average Number of Shares Outstanding, Diluted	196,131,643	155,728,209	183,121,240	152,739,130
BIOMED REALTY, L.P.	'	'	'	'
Revenues:	'	'	'	'
Rental	116,884,000	101,467,000	327,932,000	288,650,000
Tenant recoveries	38,907,000	31,765,000	104,037,000	89,155,000
Other revenue	3,441,000	1,305,000	47,352,000	1,590,000
Total revenues	159,232,000	134,537,000	479,321,000	379,395,000
Expenses:	'	'	'	'
Rental operations	51,688,000	38,944,000	134,182,000	112,717,000
Depreciation and amortization	61,898,000	51,372,000	186,219,000	143,882,000
General and administrative	11,934,000	10,226,000	32,358,000	27,416,000
Acquisition-related expenses	907,000	176,000	5,263,000	13,055,000
Total expenses	126,427,000	100,718,000	358,022,000	297,070,000
Income from operations	32,805,000	33,819,000	121,299,000	82,325,000
Equity in net loss of unconsolidated partnerships	-112,000	-339,000	-697,000	-1,011,000
Interest expense, net	-27,870,000	-26,817,000	-79,890,000	-72,863,000
Other expense	-687,000	-208,000	-4,079,000	-580,000
Income / (loss) from continuing operations	4,136,000	6,455,000	36,633,000	7,871,000
Income / (loss) from discontinued operations	'	'	'	-4,370,000
Net income / (loss)	4,136,000	6,455,000	36,633,000	3,501,000
Net (income) / loss attributable to noncontrolling interests	229,000	7,000	266,000	16,000
Net income / (loss) attributable to the Company/Operating Partnership	4,365,000	6,462,000	36,899,000	3,517,000
Preferred stock dividends / unit distributions	'	-3,651,000	-2,393,000	-10,952,000
Cost on redemption of preferred stock / units	'	'	-6,531,000	'
Net income / (loss) available to common stockholders/unitholders	$4,365,000	$2,811,000	$27,975,000	($7,435,000)
Income / (loss) from continuing operations per share / unit available to common stockholders / unitholders	$0.02	$0.02	$0.15	($0.02)
Loss from discontinued operations per share / unit available to common stockholders / unitholders	'	'	'	($0.03)
Net income / (loss) per share / unit available to common stockholders / unitholders	$0.02	$0.02	$0.15	($0.05)
Weighted Average Number of Shares Outstanding, Basic	196,062,696	155,699,816	183,048,587	155,661,231
Weighted Average Number of Shares Outstanding, Diluted	196,131,643	155,699,816	183,120,286	155,661,231

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
Consolidated Statements of Comprehensive Income (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income / (loss)	($512,000)	'	$12,000	'
Parent Company	'	'	'	'
Net income / (loss)	4,136,000	6,455,000	36,633,000	3,501,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,866,000	576,000	-252,000	3,567,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-771,000	-1,966,000	4,405,000	-5,563,000
Amortization of Other Deferred Charges	1,705,000	1,730,000	5,134,000	5,209,000
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, Net of Tax	'	'	'	545,000
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	'	-6,000	'	-38,000
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	2,280,000	10,000	8,435,000	-509,000
Other Comprehensive Income (Loss), Net of Tax	5,080,000	344,000	17,722,000	3,211,000
Comprehensive Income / loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest	9,216,000	6,799,000	54,355,000	6,712,000
Comprehensive (income) / loss, Net of Tax, Attributable to Noncontrolling Interest	-493,000	-51,000	-1,883,000	95,000
Comprehensive income / (loss), Net of Tax, Attributable to Parent	8,723,000	6,748,000	52,472,000	6,807,000
BIOMED REALTY, L.P.	'	'	'	'
Net income / (loss)	4,136,000	6,455,000	36,633,000	3,501,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,866,000	576,000	-252,000	3,567,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-771,000	-1,966,000	4,405,000	-5,563,000
Amortization of Other Deferred Charges	1,705,000	1,730,000	5,134,000	5,209,000
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, Net of Tax	'	'	'	545,000
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	'	-6,000	'	-38,000
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	2,280,000	10,000	8,435,000	-509,000
Other Comprehensive Income (Loss), Net of Tax	5,080,000	344,000	17,722,000	3,211,000
Comprehensive Income / loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest	9,216,000	6,799,000	54,355,000	6,712,000
Comprehensive (income) / loss, Net of Tax, Attributable to Noncontrolling Interest	229,000	7,000	266,000	16,000
Comprehensive income / (loss), Net of Tax, Attributable to Parent	9,445,000	6,806,000	54,621,000	6,728,000
Interest Rate Swaps \| Parent Company	'	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	'	'	4,405,000	'
Interest Rate Swaps \| BIOMED REALTY, L.P.	'	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	'	'	$4,405,000	'

Consolidated_Statement_of_Equi

Consolidated Statement of Equity (USD $)

Total

Parent Company

BIOMED REALTY, L.P.

Series A Preferred Stock

Common Stock

Additional Paid-In Capital

Accumulated Other Comprehensive (Loss)/Income

Dividends in Excess of Earnings

Total Stockholders'/Partner's Equity

Noncontrolling Interest

Limited Partner

General Partner [Member]

Forward Starting Swaps

Interest Rate Swaps

USD ($)

Parent Company

BIOMED REALTY, L.P.

Parent Company

BIOMED REALTY, L.P.

Parent Company

BIOMED REALTY, L.P.

Parent Company

BIOMED REALTY, L.P.

Common Stock

Parent Company

BIOMED REALTY, L.P.

Parent Company

BIOMED REALTY, L.P.

USD ($)

BIOMED REALTY, L.P.

USD ($)

Balance - value - period start at Dec. 31, 2012

$2,484,541,000

$1,543,000

Balance - shares - period start at Dec. 31, 2012

154,327,818

Stock Issued During Period, Shares, New Issues

14,605,000

Stock Issued During Period, Value, New Issues

287,000,000

Balance - value - period end at Mar. 31, 2013

Balance - value - period start at Dec. 31, 2012

2,484,541,000

191,469,000

1,543,000

2,781,849,000

-54,725,000

-53,077,000

-443,280,000

2,476,856,000

2,484,793,000

7,685,000

-252,000

7,937,000

2,338,464,000

Balance - units - period start at Dec. 31, 2012

7,920,000

2,932,758

154,327,818

Balance - shares - period start at Dec. 31, 2012

154,327,818

Stock Issued During Period, Shares, New Issues

31,855,000

2,034,211

31,855,000

Stock Issued During Period, Value, New Issues

641,130,000

682,648,000

319,000

640,811,000

641,130,000

682,648,000

41,518,000

641,130,000

Net issuances of unvested restricted common stock/OP units - shares

335,308

132,441

335,308

Net issuances of unvested restricted common stock/OP units - value

-4,800,000

3,000

-4,803,000

-4,800,000

Conversion of OP units to common stock - shares

-20,396

Conversion of OP units to common stock - value

-87,000

87,000

-87,000

Partners' Capital Account, Units, Redeemed

-7,920,000

Preferred Stock Redemption Premium

198,000,000

191,469,000

198,000,000

6,531,000

198,000,000

Vesting of share-based awards

9,324,000

Stock Issued During Period, Units, Issued in Connection with Wexford Merger

336,960

5,568,227

Stock Issued During Period, Value, Issued in Connection with Wexford Merger

123,596,000

7,053,000

116,543,000

Stock Issued During Period, Merger Issues

5,568,227

Stock Issued During Period, Value, Wexford Merger

116,543,000

56,000

116,487,000

116,543,000

Noncontrolling Interest, Increase from Business Combination

48,571,000

Reallocation of equity to noncontrolling interests/limited partners

48,571,000

9,014,000

-9,014,000

-7,399,000

7,399,000

Common stock dividends

-129,980,000

OP unit distributions

-3,232,000

-135,605,000

-2,393,000

-135,605,000

-3,232,000

-129,980,000

Net income / (loss)

12,000

36,633,000

8,924,000

36,365,000

36,899,000

268,000

-266,000

534,000

27,441,000

Preferred stock dividends/unit distributions

-2,393,000

Other Comprehensive Income (Loss), Foreign currency translation adjustment

-252,000

-267,000

-252,000

-267,000

-252,000

15,000

Unrealized loss on equity securities

8,435,000

7,075,000

8,435,000

7,075,000

8,435,000

1,360,000

Amortization of deferred interest costs

6,886,000

[1]

6,886,000

[1]

5,013,000

5,134,000

5,013,000

5,134,000

121,000

5,134,000

Unrealized gain on derivative instruments, net

4,405,000

4,286,000

4,405,000

4,286,000

4,405,000

119,000

4,405,000

Balance - value - period end at Sep. 30, 2013

3,016,059,000

1,921,000

3,552,595,000

-38,618,000

-35,355,000

-545,819,000

2,970,079,000

3,016,577,000

45,980,000

-518,000

46,498,000

3,005,434,000

Balance - units - period end at Sep. 30, 2013

5,415,974

192,106,749

Balance - shares - period end at Sep. 30, 2013

192,106,749

Balance - value - period start at Jun. 30, 2013

Net income / (loss)

-512,000

4,136,000

Other Comprehensive Income (Loss), Foreign currency translation adjustment

1,866,000

Unrealized gain on derivative instruments, net

-771,000

Balance - value - period end at Sep. 30, 2013

$3,016,059,000

[1]

Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
Consolidated Statements of Cash Flows (USD $)	Sep. 30, 2013	Sep. 30, 2012
Operating Activities	'	'
Net income / (loss)	$12,000	'
BIOMED REALTY, L.P.	'	'
Operating Activities	'	'
Net income / (loss)	36,633,000	3,501,000
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Depreciation and amortization	186,219,000	143,974,000
Allowance for doubtful accounts	730,000	1,167,000
Non-cash revenue adjustments	9,590,000	9,045,000
Other non-cash adjustments	9,903,000	15,283,000
Compensation expense related to restricted common stock and LTIP units / share-based payments	9,567,000	8,670,000
Distributions representing a return on capital from unconsolidated partnerships	178,000	1,145,000
Change in operating assets and liabilities	'	'
Accounts receivable	-5,573,000	-2,040,000
Accrued straight-line rents	-17,470,000	-15,740,000
Deferred leasing costs	-12,833,000	-9,873,000
Other assets	-14,001,000	-2,925,000
Accounts payable, accrued expenses and other liabilities	1,759,000	23,825,000
Net cash provided by operating activities	204,702,000	176,032,000
Investing activities	'	'
Purchases of investments in real estate and related intangible assets	-471,910,000	-367,785,000
Capital expenditures	-142,833,000	-110,205,000
Contributions from historic tax credit transactions, net of deferred costs	8,620,000	'
Contributions from new market tax credit transactions, net of deferred costs	4,078,000	'
Draws on construction loan receivable	-95,303,000	'
Contributions to unconsolidated partnerships, net	-983,000	-1,351,000
Purchases of debt and equity securities	-12,674,000	-5,101,000
Proceeds from the sale of debt and equity securities	6,103,000	133,000
Net cash used in investing activities	-704,902,000	-484,309,000
Financing activities	'	'
Proceeds from issuance of OP units	641,130,000	'
Redemption of Series A preferred stock	-198,000,000	'
Payments of deferred loan costs	-7,172,000	-5,989,000
Unsecured line of credit proceeds	687,000,000	543,000,000
Unsecured line of credit payments	-785,000,000	-724,000,000
Mortgage notes proceeds	4,182,000	'
Principal payments on mortgage notes payable	-112,837,000	-38,533,000
Proceeds from unsecured senior term loans	350,000,000	556,404,000
Unsecured senior term loan payments	'	-156,404,000
Proceeds from unsecured senior notes	'	247,815,000
Release of restriction of cash for repayment of debt	60,000,000	'
Dividends paid to common stockholders / unitholders	-123,751,000	-98,981,000
Dividends paid to preferred stockholders / unitholders	-6,045,000	-10,950,000
Net cash provided by financing activities	509,507,000	312,362,000
Effect of exchange rate changes on cash and cash equivalents	-53,000	150,000
Net increase / (decrease) in cash and cash equivalents	9,254,000	4,235,000
Cash and cash equivalents at beginning of period	19,976,000	16,411,000
Cash and cash equivalents at end of period	29,230,000	20,646,000
Supplemental disclosure of cash flow information:	'	'
Cash paid during the period for interest (net of amounts capitalized of $9,999 and $6,376 during the nine months ended September 30, 2013 and 2012, respectively)	67,079,000	58,978,000
Supplemental disclosure of non-cash investing and financing activities:	'	'
Accrual for preferred stock dividends / unit distributions declared	'	3,651,000
Accrual for common stock dividends / unit distributions declared	46,418,000	33,815,000
Accrued additions to real estate and related intangible assets	60,246,000	28,545,000
Mortgage notes assumed (includes premiums of $8,671 and $1,802 during the nine months ended September 30, 2013 and 2012, respectively)	254,660,000	25,947,000
Equity issued in connection with Wexford merger and 320 Charles Street acquisition	165,114,000	'
Deposits applied for acquisitions	'	18,649,000
Debt Instrument, Unamortized Premium	8,671,000	1,802,000
Parent Company	'	'
Operating Activities	'	'
Net income / (loss)	36,633,000	3,501,000
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Depreciation and amortization	186,219,000	143,974,000
Allowance for doubtful accounts	730,000	1,167,000
Non-cash revenue adjustments	9,590,000	9,045,000
Other non-cash adjustments	9,903,000	15,283,000
Compensation expense related to restricted common stock and LTIP units / share-based payments	9,567,000	8,670,000
Distributions representing a return on capital from unconsolidated partnerships	178,000	1,145,000
Change in operating assets and liabilities	'	'
Accounts receivable	-5,573,000	-2,040,000
Accrued straight-line rents	-17,470,000	-15,740,000
Deferred leasing costs	-12,833,000	-9,873,000
Other assets	-14,001,000	-2,925,000
Accounts payable, accrued expenses and other liabilities	1,759,000	23,825,000
Net cash provided by operating activities	204,702,000	176,032,000
Investing activities	'	'
Purchases of investments in real estate and related intangible assets	-471,910,000	-367,785,000
Capital expenditures	-142,833,000	-110,205,000
Contributions from historic tax credit transactions, net of deferred costs	8,620,000	'
Contributions from new market tax credit transactions, net of deferred costs	4,078,000	'
Draws on construction loan receivable	-95,303,000	'
Contributions to unconsolidated partnerships, net	-983,000	-1,351,000
Purchases of debt and equity securities	-12,674,000	-5,101,000
Proceeds from the sale of debt and equity securities	6,103,000	133,000
Net cash used in investing activities	-704,902,000	-484,309,000
Financing activities	'	'
Proceeds from common stock offering	668,553,000	'
Payment of offering costs	-27,423,000	'
Redemption of Series A preferred stock	-198,000,000	'
Payments of deferred loan costs	-7,172,000	-5,989,000
Unsecured line of credit proceeds	687,000,000	543,000,000
Unsecured line of credit payments	-785,000,000	-724,000,000
Mortgage notes proceeds	4,182,000	'
Principal payments on mortgage notes payable	-112,837,000	-38,533,000
Proceeds from unsecured senior term loans	350,000,000	556,404,000
Unsecured senior term loan payments	'	-156,404,000
Proceeds from unsecured senior notes	'	247,815,000
Release of restriction of cash for repayment of debt	60,000,000	'
Distributions to operating partnership unit and LTIP unit holders	-2,648,000	-1,865,000
Dividends paid to common stockholders / unitholders	-121,103,000	-97,116,000
Dividends paid to preferred stockholders / unitholders	-6,045,000	-10,950,000
Net cash provided by financing activities	509,507,000	312,362,000
Effect of exchange rate changes on cash and cash equivalents	-53,000	150,000
Net increase / (decrease) in cash and cash equivalents	9,254,000	4,235,000
Cash and cash equivalents at beginning of period	19,976,000	16,411,000
Cash and cash equivalents at end of period	29,230,000	20,646,000
Supplemental disclosure of cash flow information:	'	'
Cash paid during the period for interest (net of amounts capitalized of $9,999 and $6,376 during the nine months ended September 30, 2013 and 2012, respectively)	67,079,000	58,978,000
Supplemental disclosure of non-cash investing and financing activities:	'	'
Accrual for preferred stock dividends / unit distributions declared	'	3,651,000
Accrual for common stock dividends / unit distributions declared	45,145,000	33,182,000
Accrual for distributions declared for operating partnership unit and LTIP unit holders	1,273,000	633,000
Accrued additions to real estate and related intangible assets	60,246,000	28,545,000
Mortgage notes assumed (includes premiums of $8,671 and $1,802 during the nine months ended September 30, 2013 and 2012, respectively)	254,660,000	25,947,000
Equity issued in connection with Wexford merger and 320 Charles Street acquisition	165,114,000	'
Deposits applied for acquisitions	'	18,649,000
Debt Instrument, Unamortized Premium	$8,671,000	$1,802,000

Organization_of_the_Parent_Com

Organization of the Parent Company and Description of Business	9 Months Ended
	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization of the Parent Company and Description of Business	'
	Organization of the Parent Company and Description of Business

	BioMed Realty Trust, Inc., a Maryland corporation (the “Parent Company”), operates as a fully integrated, self-administered and self-managed real estate investment trust (“REIT”) focused on acquiring, developing, owning, leasing and managing laboratory and office space for the life science industry principally through its subsidiary, BioMed Realty, L.P., a Maryland limited partnership (the “Operating Partnership” and together with the Parent Company referred to as the “Company”). The Company’s tenants primarily include biotechnology and pharmaceutical companies, scientific research institutions, government agencies and other entities involved in the life science industry. The Company’s properties are generally located in markets with well-established reputations as centers for scientific research, including Boston, San Francisco, Maryland, San Diego and New York and, through Wexford Science and Technology, LLC and related entities (collectively, "Wexford"), with universities and their related medical systems such as Wake Forest University in Winston-Salem, North Carolina, University of Pennsylvania in Philadelphia, Pennsylvania, and Washington University in St. Louis, Missouri.

	The Parent Company is the sole general partner of the Operating Partnership and, as of September 30, 2013, owned a 97.3% interest in the Operating Partnership. The remaining 2.7% interest in the Operating Partnership is held by limited partners. Each partner’s percentage interest in the Operating Partnership is determined based on the number of operating partnership units and long-term incentive plan units (“LTIP units” and together with the operating partnership units, the “OP units”) owned as compared to total OP units (and potentially issuable OP units, as applicable) outstanding as of each period end and is used as the basis for the allocation of net income or loss to each partner.

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Summary of Significant Accounting Policies	'
	Basis of Presentation and Summary of Significant Accounting Policies

	The accompanying interim financial statements are unaudited, but have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in conjunction with the rules and regulations of the U.S. Securities and Exchange Commission. Accordingly, they do not include all the disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments and eliminations, consisting of normal recurring adjustments necessary for a fair presentation of the financial statements for these interim periods have been recorded. These financial statements should be read in conjunction with the audited consolidated financial statements and notes therein included in the Company’s annual report on Form 10-K for the year ended December 31, 2012.

	Principles of Consolidation

	The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, partnerships and limited liability companies it controls, and variable interest entities (“VIEs”) for which the Company has determined itself to be the primary beneficiary. All material intercompany transactions and balances have been eliminated. The Company consolidates entities the Company controls and records a noncontrolling interest for the portions not owned by the Company. Control is determined, where applicable, by the sufficiency of equity invested and the rights of the equity holders, and by the ownership of a majority of the voting interests, with consideration given to the existence of approval or veto rights granted to the minority stockholder. If the minority stockholder holds substantive participating rights, it overcomes the presumption of control by the majority voting interest holder. In contrast, if the minority stockholder simply holds protective rights (such as consent rights over certain actions), it does not overcome the presumption of control by the majority voting interest holder.

	Assets and liabilities of subsidiaries outside the United States with non-U.S. dollar functional currencies are translated into U.S. dollars using exchange rates as of the balance sheet dates. Income and expenses are translated using the average exchange rates for the reporting period. Foreign currency translation adjustments are recorded as a component of other comprehensive income. For the three months ended September 30, 2013 and 2012, total revenues from properties outside the United States were $4.5 million and $4.4 million, respectively, which represented 2.8% and 3.3% of the Company’s total revenues during the respective periods. For the nine months ended September 30, 2013 and 2012, total revenues from properties outside the United States were $13.5 million and $5.3 million, respectively, which represented 2.8% and 1.4% of the Company's total revenues during the respective periods. The Company’s net investment in properties outside the United States was $190.5 million and $188.8 million at September 30, 2013 and December 31, 2012, respectively.

	Investments in Partnerships and Limited Liability Companies

	The Company has determined that it is the primary beneficiary in five VIEs, consisting of single-tenant properties in which the tenant has a fixed-price purchase option, which are consolidated and reflected in the accompanying consolidated financial statements. Selected financial data of the VIEs at September 30, 2013 and December 31, 2012 consist of the following (in thousands):


		September 30,				December 31,
		2013				2012
	Investment in real estate, net	$	332,004			$	334,331

	Total assets	371,341				369,460

	Total debt	143,538				144,889

	Total liabilities	152,051				149,336


	The Company is also a party to certain VIEs through its ownership of Wexford, which are described in further detail in Note 11.

	Investments in Real Estate, Net

	Investments in real estate, net consisted of the following (in thousands):


		September 30,				December 31,
		2013				2012
	Land	$	692,633			$	702,993

	Land under development	133,372				48,744

	Buildings and improvements	4,771,874				4,028,089

	Construction in progress	311,296				143,340

		5,909,175				4,923,166

	Accumulated depreciation	(737,073		)		(603,450		)
		$	5,172,102			$	4,319,716


	Impairment of Long-Lived Assets and Long-Lived Assets to be Disposed

	The Company reviews long-lived assets and certain identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. The review of recoverability is based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the long-lived asset’s use and eventual disposition. These cash flows consider factors such as expected future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a long-lived asset, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair-value of the property. The Company is required to make subjective assessments as to whether there are impairments in the values of its investments in long-lived assets. These assessments have a direct impact on the Company’s net income because recording an impairment loss results in an immediate negative adjustment to net income. 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. Although the Company’s strategy is to hold its properties over the long-term, if the Company’s strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized to reduce the property to the lower of the carrying amount or fair-value, and such loss could be material.

	In April 2012, the Company completed the exchange of a property for another real estate operating property. As a result, the property disposed of was reclassified as a discontinued operation. This property was written down to its estimated fair-value of $28.0 million, less costs to sell, which resulted in an impairment loss of $4.6 million that is included in loss from discontinued operations for the nine months ended September 30, 2012. The parties to the exchange determined and agreed upon the fair-value of the property received in the transaction, which the Company considers to be a level 2 input in the fair-value hierarchy. See Note 12 for discussion of discontinued operations.

	Deferred Leasing Costs, Net

	Leasing commissions and other direct costs associated with obtaining new or renewal leases are recorded at cost and amortized on a straight-line basis over the terms of the respective leases, with remaining terms ranging from less than one year to approximately 20 years as of September 30, 2013. Deferred leasing costs also include the net carrying value of acquired in-place leases and acquired management agreements.

	Deferred leasing costs, net at September 30, 2013 consisted of the following (in thousands):


		Balance at				Accumulated
	September 30, 2013				Amortization				Net
Acquired in-place leases	$	368,733			$	(225,811	)		$	142,922

Acquired management agreements	25,801				(19,677		)		6,124

Deferred leasing and other direct costs	82,205				(28,858		)		53,347

	$	476,739			$	(274,346	)		$	202,393


Deferred leasing costs, net at December 31, 2012 consisted of the following (in thousands):


	Balance at				Accumulated
	31-Dec-12				Amortization				Net
Acquired in-place leases	$	303,521			$	(185,463	)		$	118,058

Acquired management agreements	24,963				(15,242		)		9,721

Deferred leasing and other direct costs	68,175				(23,591		)		44,584

	$	396,659			$	(224,296	)		$	172,363


Investments

Investments in equity securities, which are included in other assets on the accompanying consolidated balance sheets, consisted of the following (in thousands):


	September 30,				December 31,
	2013				2012
Available-for-sale securities, historical cost	$	8,840			$	275

Unrealized gain, net	8,551				115

Available-for-sale securities, fair-value (1)	17,391				390

Privately-held securities, cost basis	13,130				12,280

Total equity securities	$	30,521			$	12,670

____________

-1	Determination of fair-value is classified as Level 1 in the fair-value hierarchy based on the use of quoted prices in active markets.

The Company holds investments in available-for-sale securities of certain publicly traded companies. Certain of these investments have fair-values less than the Company’s cost basis, net of previous other-than-temporary impairment in these securities due to decreases in their respective stock prices during the nine months ended September 30, 2013. However, management has the intent and ability to retain the investments for a period of time sufficient to allow for an anticipated recovery in their market value. Management will continue to periodically evaluate whether any investment, the fair-value of which is less than the Company’s cost basis, should be considered other-than-temporarily impaired. If other-than-temporary impairment is considered to exist, the related unrealized loss will be reclassified from accumulated other comprehensive loss and recorded as a reduction of net income.

The Company also holds investments in securities of certain privately-held companies and funds, which are recorded at cost basis due to the Company’s lack of control or significant influence over such companies and funds.

During the nine months ended September 30, 2013, the Company recorded a $2.8 million impairment charge, which is included in other expense in the consolidated statements of operations. The impairment charge related to the Company’s investment in a privately-held company, comprising a $2.0 million cost basis equity investment and $825,000 related to notes receivable that were included in other assets on the consolidated balance sheets. Other than this investment there were no identified events or changes in circumstances that may have a significant adverse effect on the carrying value of the Company’s cost basis investments and therefore, no evaluation of impairment was performed during the nine months ended September 30, 2013 on the Company’s remaining cost basis investments.

Construction Loan Receivable

The Company has a $255.0 million interest in a $355.0 million construction loan secured by first priority mortgages on a 1.1 million square foot laboratory, office and retail development project located in Boston, Massachusetts, which is 95% leased to Vertex Pharmaceuticals Incorporated to serve as its new corporate headquarters.

The construction loan matures on September 30, 2014, with two one-year extension options exercisable at the borrower’s election after paying the lenders an extension fee on the then-outstanding principal amount. The construction loan bears interest on the outstanding principal amount at a floating rate equal to the greater of (1) reserve adjusted LIBOR plus 550 basis points and (2) 6.5%. In addition, the borrower is required to pay a fee to the lenders based on a specified percentage of the average daily unfunded amount of the construction loan. The borrower may prepay the construction loan in part under certain circumstances, and may prepay the construction loan in full with prior notice and a prepayment fee to the lenders. As of September 30, 2013, the Company had invested approximately $120.9 million in the construction loan, which is included in other assets on the Company's consolidated balance sheet. The Company expects to have fully funded its obligation in early 2014.

Lease Termination

During the three and nine months ended September 30, 2013, the Company recorded lease termination revenue, net of write-offs of lease intangibles, included in other revenue on the consolidated statement of operations of approximately $1.5 million and $42.8 million, respectively. Lease termination revenue related to the termination of a lease with Elan Corporation (“Elan”) at the Company’s Science Center at Oyster Point property for which Elan paid the Company $46.5 million, and the termination of a lease effective August 2013 with Merck at the Company's 320 Bent Street property for which Merck paid the Company $8.7 million in August 2012.

Management’s Estimates

Management has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reporting of revenue and expenses during the reporting period to prepare these consolidated financial statements in conformity with GAAP. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and reported amounts of revenue and expenses that are not readily apparent from other sources. Actual results could differ from those estimates under different assumptions or conditions.

Equity_of_the_Parent_Company

Equity of the Parent Company	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Equity of the Parent Company	'
	Equity of the Parent Company

	During the nine months ended September 30, 2013, the Parent Company issued restricted stock awards to the Company’s employees and directors totaling 620,590 and 26,897 shares of common stock, respectively (253,289 shares of common stock were surrendered to the Company and subsequently retired in lieu of cash payments for taxes due on the vesting of restricted stock and 38,821 shares were forfeited during the same period), which are included in the total of common stock outstanding as of the period end.

	Of the restricted stock awards issued to the Company's employees, 20,069 shares were issued as part of the consideration paid in the Company's merger with Wexford (as discussed below), and 41,568 shares are subject to performance-based vesting conditions. In addition, in connection with the merger with Wexford, the Operating Partnership issued 132,441 operating partnership units which are also subject to performance-based vesting conditions. The aggregate grant date fair-value of these performance-based awards of approximately $3.6 million will be recognized as compensation expense on a straight-line basis over each respective vesting period. The total compensation expense remaining for these awards to be expensed in future periods as of September 30, 2013 was approximately $3.3 million over a weighted-average term of approximately 3.70 years. Dividends and distributions are payable on these awards from the date of issuance.

	The Parent Company awarded units to certain of its executive officers (the “Performance Units”), which represent a contingent right to receive one share of the Parent Company’s common stock if vesting conditions are satisfied. Outstanding Performance Units vest ratably over two or three year periods (each, a “Performance Period”) based upon the Parent Company’s total stockholder return relative to its peer group (the "Market Conditions"). The grant date fair-value of the Performance Units was estimated using a Monte Carlo simulation which considered the likelihood of achieving the Market Conditions. The expected value of the Performance Units on the grant date was determined by simulating the total stockholder return for the Parent Company and the peer group, considering the stock price variance for each of the peer group companies compared to each other and the Parent Company. In January 2013, 136,296 Performance Units, which were originally granted to certain executive officers in January 2012 and represent the maximum number of Performance Units that could have vested, were forfeited as a result of the Parent Company's total stockholder return relative to its peer group in 2012 being below the threshold for any payout. During the nine months ended September 30, 2013, the Parent Company awarded 406,288 performance units which represent the maximum number of Performance Units that may vest. The grant date fair-value of these awards of approximately $3.6 million will be recognized as compensation expense on a straight-line basis over each respective Performance Period. The total compensation remaining on the Performance Units granted during the nine months ended September 30, 2013 to be expensed in future periods over a weighted-average term of approximately 1.78 years was $2.5 million as of September 30, 2013. No dividends will be paid or accrued on the Performance Units, and shares of the Parent Company's common stock will not be issued until vesting of the Performance Units occurs.

	In February 2013, the Parent Company issued 14,605,000 shares of common stock and contributed net proceeds of approximately $287.0 million, after deducting the underwriters' discounts and commissions and offering expenses, to the Operating Partnership in exchange for the issuance of 14,605,000 operating partnership units. The net proceeds to the Operating Partnership were utilized to fund the acquisition of the Woodside Technology Park property in Redwood City, California, to fund a portion of the redemption of all 7,920,000 outstanding shares of the Parent Company's 7.375% Series A Cumulative Redeemable Preferred Stock (“Series A preferred stock”), to repay a portion of the outstanding indebtedness under its unsecured line of credit and for other general corporate and working capital purposes.

	In April 2013, the Parent Company issued 17,250,000 shares of common stock and contributed net proceeds of approximately $354.1 million, after deducting the underwriters' discounts and commissions and offering expenses, to the Operating Partnership in exchange for the issuance of 17,250,000 operating partnership units. The net proceeds to the Operating Partnership were utilized to repay a portion of the outstanding indebtedness under its unsecured line of credit, to fund a portion of the purchase price of the merger with Wexford and for other general corporate and working capital purposes.

	In May 2013, as part of the consideration paid for the merger with Wexford, the sellers received 5,568,227 shares of the Parent Company’s common stock and 336,960 operating partnership units, of which 20,069 shares of common stock and all of the operating partnership units are subject to certain restrictions.

	In June 2013, as part of the consideration paid for the Company’s acquisition of the 320 Charles Street property in Cambridge, Massachusetts, the seller received 2,034,211 operating partnership units.

	Common Stock, Operating Partnership Units and LTIP Units

	As of September 30, 2013, the Company had outstanding 192,106,749 shares of the Parent Company’s common stock and 5,083,400 and 332,574 operating partnership and LTIP units, respectively (excluding operating partnership units held by the Parent Company). A share of the Parent Company’s common stock and the operating partnership and LTIP units have essentially the same economic characteristics as they share equally in the total net income or loss and distributions of the Operating Partnership.

	7.375% Series A Cumulative Redeemable Preferred Stock

	On March 15, 2013, the Company redeemed all 7,920,000 outstanding shares of its Series A preferred stock for approximately $198.0 million, or $25.00 per share, net of accrued dividends of approximately $2.4 million, or $0.30217 per share. The redemption of the Series A preferred stock resulted in the recognition of costs on redemption of preferred stock of approximately $6.5 million for the nine months ended September 30, 2013 as a result of the difference between the carrying value and the price paid to redeem the Series A preferred stock.

	Dividends and Distributions

	The following table lists the dividends and distributions declared by the Parent Company and the Operating Partnership during the nine months ended September 30, 2013:



	Declaration Date		Securities Class		Amount Per			Period Covered		Dividend and		Dividend and
					Share/Unit					Distribution		Distribution Amount
										Payable Date
												(In thousands)
	March 15, 2013		Common stock and OP units		$	0.235		January 1, 2013 to March 31, 2013		April 15, 2013		$	40,413

	June 14, 2013		Common stock and OP units		$	0.235		April 1, 2013 to June 30, 2013		July 15, 2013		$	46,381

	September 16, 2013		Common stock and OP units		$	0.235		July 1, 2013 to September 30, 2013		October 15, 2013		$	46,418


	Total 2013 dividends and distributions declared through September 30, 2013 (in thousands):



	Common stock and OP units	$	133,212

	Series A preferred stock/units (1)	2,393

		$	135,605

	____________


	-1	On March 15, 2013, the Company redeemed all 7,920,000 outstanding shares of its Series A preferred stock for approximately $198.0 million, or $25.00 per share, net of accrued dividends of approximately $2.4 million, or $0.30217 per share.

	Changes in Accumulated Other Comprehensive Loss by Component



		Foreign currency translation adjustments				Unrealized gains / (losses) on available-for-sale securities			Gain / (loss) on derivative instruments				Total

	Balance at December 31, 2012	$	3,543			$	114		$	(58,382	)		$	(54,725	)

Other comprehensive (loss) / income before reclassifications	(252		)		8,435			2,653				10,836

Amounts reclassified from accumulated other comprehensive income (1)	—				—			6,886				6,886

Net other comprehensive (loss) / income	(252		)		8,435			9,539				17,722

Net other comprehensive loss allocable to noncontrolling interests	(15		)		(1,360		)	(240		)		(1,615		)
Balance as of September 30, 2013	$	3,276			$	7,189		$	(49,083	)		$	(38,618	)

____________


-1	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Noncontrolling Interests

Noncontrolling interests on the consolidated balance sheets of the Parent Company relate primarily to the OP units in the Operating Partnership that are not owned by the Parent Company. With respect to the noncontrolling interests in the Operating Partnership, noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or common stock at the option of the issuer are further evaluated to determine whether temporary or permanent equity classification on the balance sheet is appropriate. Because the OP units comprising the noncontrolling interests contain such a provision, the Company evaluated this guidance, including the requirement to settle in unregistered shares, and determined that the OP units meet the requirements to qualify for presentation as permanent equity.

The Company evaluates individual redeemable noncontrolling interests for the ability to continue to recognize the noncontrolling interest as permanent equity in the consolidated balance sheets. Any redeemable noncontrolling interest that fails to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount, or (2) its redemption value at the end of the period in which the determination is made.

The redemption value of the OP units not owned by the Parent Company, had such units been redeemed at September 30, 2013, was approximately $103.2 million based on the average closing price of the Parent Company’s common stock of $19.05 per share for the ten consecutive trading days immediately preceding September 30, 2013.

The following table shows the vested ownership interests in the Operating Partnership:



	September 30, 2013						December 31, 2012
	Operating Partnership Units and LTIP Units			Percentage of Total			Operating Partnership Units and LTIP Units		Percentage of Total
BioMed Realty Trust	190,676,810			97.3	%		152,853,368		98.1	%

Noncontrolling interest consisting of:
Operating partnership and LTIP units held by employees and related parties	2,656,388			1.4	%		2,339,314		1.5	%

Operating partnership and LTIP units held by third parties	2,627,145			1.3	%		565,051		0.4	%

Total	195,960,343			100	%		155,757,733		100	%

Capital_of_the_Operating_Partn

Capital of the Operating Partnership	9 Months Ended
	Sep. 30, 2013
Partners' Capital [Abstract]	'
Capital of the Operating Partnership	'
	Capital of the Operating Partnership

	Operating Partnership Units and LTIP Units

	As of September 30, 2013, the Operating Partnership had outstanding 197,190,149 operating partnership units and 332,574 LTIP units. The Parent Company owned 97.3% of the partnership interests in the Operating Partnership at September 30, 2013, is the Operating Partnership’s general partner and is responsible for the management of the Operating Partnership’s business. As the general partner of the Operating Partnership, the Parent Company effectively controls the ability to issue common stock of the Parent Company upon a limited partner’s notice of redemption. In addition, the Parent Company has generally acquired OP units upon a limited partner’s notice of redemption in exchange for shares of its common stock. The redemption provisions of OP units owned by limited partners that permit the Parent Company to settle in either cash or common stock at the option of the Parent Company are further evaluated in accordance with applicable accounting guidance to determine whether temporary or permanent equity classification on the balance sheet is appropriate. The Operating Partnership evaluated this guidance, including the requirement to settle in unregistered shares, and determined that these OP units meet the requirements to qualify for presentation as permanent equity.

	The redemption value of the OP units owned by the limited partners, not including the Parent Company, had such units been redeemed at September 30, 2013, was approximately $103.2 million based on the average closing price of the Parent Company’s common stock of $19.05 per share for the ten consecutive trading days immediately preceding September 30, 2013.

	Changes in Accumulated Other Comprehensive Loss by Component



		Foreign currency translation adjustments			Unrealized gains on available- for-sale securities		Gain / (loss) on derivative instruments			Total

	Balance at December 31, 2012	$	3,611		$	115	$	(56,803	)	$	(53,077	)

	Other comprehensive (loss) / income before reclassifications	(252		)	8,435		2,653			10,836

	Amounts reclassified from accumulated other comprehensive income (1)	—			—		6,886			6,886

	Net other comprehensive (loss) / income	(252		)	8,435		9,539			17,722

	Balance as of September 30, 2013	$	3,359		$	8,550	$	(47,264	)	$	(35,355	)

	____________


	-1	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Debt

Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Debt Disclosure	'
	Debt

	Debt of the Parent Company

	The Parent Company does not hold any indebtedness. All debt is held directly or indirectly by the Operating Partnership; however, the Parent Company has guaranteed the Operating Partnership’s mortgage loan secured by the Company’s Center for Life Science \| Boston property, Exchangeable Senior Notes due 2030 (the “Exchangeable Senior Notes”), Unsecured Senior Notes due 2016 (the “Notes due 2016”), Unsecured Senior Notes due 2020 (the “Notes due 2020”), Unsecured Senior Notes due 2022 (the “Notes due 2022”), Unsecured Senior Term Loan due 2017 (the “Term Loan due 2017”), Unsecured Senior Term Loan due 2018 (the “Term Loan due 2018”) and unsecured line of credit.

	Debt of the Operating Partnership

	The following is a summary of the Operating Partnership’s outstanding consolidated debt as of September 30, 2013 and December 31, 2012 (dollars in thousands):



		Stated Interest Rate			Effective Interest Rate			Principal Balance
								September 30,				December 31,				Maturity Date
								2013				2012
	Mortgage Notes Payable
	9900 Belward Campus Drive	5.64	%		3.99	%		$	10,666			$	10,767			July 1, 2017

	9901 Belward Campus Drive	5.64	%		3.99	%		13,135				13,260				July 1, 2017

	Center for Life Science \| Boston	7.75	%		7.75	%		335,476				338,447				June 30, 2014

	4320 Forest Park Avenue (1)	4	%		2.7	%		21,000				—				June 30, 2015

	Heritage @ 4240 (2)	3.18	%		3.18	%		4,194				—				December 26, 2015

	Hershey Center for Applied Research (1)	6.15	%		4.71	%		13,568				—				May 5, 2027

	500 Kendall Street (Kendall D)	6.38	%		5.45	%		58,500				60,164				December 1, 2018

	Shady Grove Road	5.97	%		5.97	%		143,538				144,889				September 1, 2016

	University of Maryland BioPark I (1)	5.93	%		4.69	%		16,915				—				May 15, 2025

	University of Maryland BioPark II (1)	5.2	%		4.33	%		63,198				—				September 5, 2021

	University of Maryland BioPark Garage (1)	5.2	%		4.33	%		4,757				—				September 1, 2021

	University of Miami Life Science & Technology Park (1)	4	%		2.89	%		20,000				—				February 1, 2016

								704,947				567,527

	Unamortized premiums							11,786				4,125

	Mortgage notes payable, net							716,733				571,652

	Exchangeable Senior Notes	3.75	%		3.75	%		180,000				180,000				January 15, 2030

	Notes due 2016	3.85	%		3.99	%		400,000				400,000				April 15, 2016

	Notes due 2020	6.13	%		6.27	%		250,000				250,000				April 15, 2020

	Notes due 2022	4.25	%		4.36	%		250,000				250,000				July 15, 2022

								900,000				900,000

	Unamortized discounts							(5,150		)		(5,823		)
	Unsecured senior notes, net							894,850				894,177

	Term Loan due 2017 - U.S. dollar (3)	1.83	%		2.64	%		243,596				243,596				March 30, 2017

	Term Loan due 2017 - GBP (3)	2.14	%		2.39	%		161,630				161,860				March 30, 2017

Term Loan due 2018 (4)	1.68	%		1.68	%		350,000				—				March 24, 2018

Unsecured senior term loans							755,226				405,456

Unsecured line of credit (4) (5)	1.48	%		1.48	%		20,000				118,000				March 24, 2018

Total consolidated debt							$	2,566,809			$	2,169,285

____________


-1	Mortgage notes which were assumed on May 31, 2013 in connection with the Company’s merger with Wexford.

-2	In October 2013, the Operating Partnership voluntarily repaid in full the outstanding mortgage note pertaining to the Heritage @ 4240 property prior to the scheduled maturity.

-3	In August 2012, the Operating Partnership converted approximately $156.4 million of outstanding borrowings into British pounds sterling (“GBP”) equal to £100.0 million, which was designated as a net investment hedge to mitigate the risk of fluctuations in foreign currency exchange rates. The principal balance represents the U.S. dollar amount based on the exchange rate of $1.62 to £1.00 at both September 30, 2013 and December 31, 2012. The effective interest rate includes the impact of interest rate swap agreements (see Note 9 for further discussion of interest rate swap agreements).

-4	In September 2013, the Operating Partnership amended and restated its unsecured credit agreement, providing for aggregate borrowing of up to $1.25 billion, consisting of an unsecured line of credit of $900.0 million and a term loan of $350.0 million (the Term Loan due 2018). In connection with the amendment and restatement of the credit agreement, unamortized loan fees under the previous credit agreement of approximately $462,500 were charged to interest expense.

-5	At September 30, 2013, the Operating Partnership had additional borrowing capacity under the unsecured line of credit of up to approximately $880.0 million.


Exchangeable Senior Notes

The exchange rate for the Exchangeable Senior Notes may be adjusted under certain circumstances, including the payment of cash dividends in excess of $0.14 per share of common stock. The increase in the quarterly cash dividend through the third quarter of 2013 resulted in an increase in the exchange rate of the Exchangeable Senior Notes to 57.8068 shares per $1,000 principal amount of Exchangeable Senior Notes (effective conversion value of $17.30 per share), as of September 26, 2013, the Company’s ex-dividend date.

Amended and Restated Credit Facility and Term Loan Amendment

On September 24, 2013, the Operating Partnership entered into an amended and restated unsecured credit agreement (the “Amended and Restated Credit Facility”), amending and restating its unsecured credit agreement dated July 14, 2011, as amended, and a second amendment (the “Term Loan Amendment”) to its senior unsecured term loan facility dated March 30, 2012, as amended, with KeyBank National Association, as Administrative Agent, and certain other lenders.

The Amended and Restated Credit Facility provides for aggregate borrowings of up to $1.25 billion, consisting of a $900.0 million revolving line of credit and a $350.0 million Term Loan due 2018, with a maturity date of March 24, 2018. Subject to the Administrative Agent’s reasonable discretion, the Operating Partnership may increase the amount of the commitments under the Amended and Restated Credit Facility up to $1.8 billion upon satisfying certain conditions. In addition, the Operating Partnership, at its sole discretion, may extend the maturity date to September 24, 2018 after satisfying certain conditions and paying an extension fee. Borrowings under the unsecured line of credit and the Term Loan due 2018 are guaranteed by the Parent Company.

Borrowings under the Amended and Restated Credit Facility bear interest at floating rates equal to, at the Operating Partnership’s option, either (1) reserve-adjusted LIBOR plus a spread which ranges from 92.5 to 170 basis points (with respect to the unsecured line of credit) and a spread which ranges from 95 to 195 basis points (with respect to the Term Loan due 2018), in each case depending on the Parent Company’s credit ratings, or (2) the highest of (a) the prime rate then in effect plus a spread which ranges from 0 to 70 basis points, (b) the federal funds rate then in effect plus a spread which ranges from 50 to 120 basis points, or (c) one-month LIBOR plus a spread which ranges from 92.5 to 170 basis points (with respect to the unsecured line of credit) and a spread which ranges from 95 to 195 basis points (with respect to the Term Loan due 2018), in each case depending on the Parent Company’s credit ratings. In addition, a facility fee is payable on the total $900.0 million capacity of the unsecured line of credit, which ranges from 12.5 to 30 basis points per annum, depending on the Parent Company’s credit ratings.
The Amended and Restated Credit Facility and Term Loan Amendment changed, among other things, (1) the definition of “Capitalization Rate” to mean 7.25% with respect to all projects other than the Company's Center for Life Science \| Boston property, and 6.25% with respect to the Center for Life Science \| Boston property and (2) certain definitions used to calculate the financial covenants.
On September 25, 2013, the Operating Partnership entered into interest rate swap agreements, which are intended to have the effect of fixing interest payments associated with $200.0 million of the Term Loan due 2018 outstanding at approximately 2.2% for a three-year term, subject to adjustment based on the Parent Company's credit ratings. See Note 9 for further details.

Net Investment Hedge

The Operating Partnership designated the GBP denominated debt under the Term Loan due 2017 as a net investment hedge. The Operating Partnership entered into this net investment hedge to protect a designated amount of the Operating Partnership’s net investment in a GBP functional currency subsidiary against the risk of adverse changes in the GBP/U.S. dollar exchange rate (foreign exchange risk). Variability in the GBP/U.S. dollar exchange rate impacts the Operating Partnership (a U.S. dollar functional currency entity) as the financial statements of the GBP functional currency subsidiary are translated each period, with the effect of changes in the GBP/U.S. dollar exchange rate being recorded in accumulated other comprehensive income. When the net investment is sold or substantially liquidated, the balance of the cumulative translation adjustment accumulated in other comprehensive income will be reclassified into earnings. The Operating Partnership is hedging the risk of changes in the U.S. dollar equivalent value of a portion of its net investment in its GBP subsidiary attributable to changes in the GBP/U.S. dollar exchange rate during the period of investment during which the hedging instrument is outstanding.

As of September 30, 2013, principal payments due for the Operating Partnership’s consolidated indebtedness (excluding debt premiums and discounts) were as follows (in thousands):



2013	$	6,897

2014	341,415

2015	30,006

2016	566,516

2017	435,520

Thereafter (1)	1,179,819

	$	2,560,173

____________


-1	Includes $180.0 million in principal payments of the Exchangeable Senior Notes based on a contractual maturity date of January 15, 2030.

Earnings_Per_Share_of_the_Pare

Earnings Per Share of the Parent Company	9 Months Ended
	Sep. 30, 2013
Earnings Per Share, Basic and Diluted [Abstract]	'
Earnings Per Share of the Parent Company	'
	Earnings Per Share of the Parent Company

	Through September 30, 2013 all of the Company’s participating securities (including the OP units) received dividends/distributions at an equal dividend/distribution rate per share/unit. As a result, the portion of net income allocable to the weighted-average unvested restricted stock outstanding for the three and nine months ended September 30, 2013 and 2012 has been deducted from net income available to common stockholders to calculate basic earnings per share. The calculation of diluted earnings per share for the three and nine months ended September 30, 2013 and the three months ended September 30, 2012 includes the outstanding OP units (both vested and unvested) in the weighted-average shares, and net income attributable to noncontrolling interests in the Operating Partnership has been added back to net income available to common stockholders. For the nine months ended September 30, 2012, the outstanding OP units (both vested and unvested) were anti-dilutive to the calculation of diluted earnings per share and were therefore excluded and net income attributable to noncontrolling interests in the Operating Partnership has not been added back to net income available to common stockholders. For the three and nine months ended September 30, 2013, the Performance Units were dilutive to the calculation of diluted earnings per share as calculated, assuming that September 30, 2013 was the end date of the Performance Units' Performance Period. For the three and nine months ended September 30, 2012, the Performance Units were anti-dilutive to the calculation of diluted earnings per share as calculated, assuming that September 30, 2012 was the end date of the Performance Units' Performance Period. For the three and nine months ended September 30, 2013 and 2012, the unvested restricted stock was anti-dilutive to the calculation of diluted earnings per share and was therefore excluded. As a result, diluted earnings per share was calculated based upon net income available to common stockholders less net income allocable to unvested restricted stock and distributions in excess of earnings attributable to unvested restricted stock. In addition, 10,405,224 and 10,127,232 shares issuable upon settlement of the exchange feature of the Exchangeable Senior Notes were anti-dilutive and were not included in the calculation of diluted earnings per share based on the “if converted” method for the three and nine months ended September 30, 2013 and 2012, respectively. No other shares were considered anti-dilutive for the three and nine months ended September 30, 2013 or 2012.

	Computations of basic and diluted earnings per share (in thousands, except share data) were as follows:



		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2013				2012				2013				2012
	Basic earnings per share:
	Income from continuing operations	$	4,136			$	6,455			$	36,633			$	7,871

	Loss / (income) from continuing operations attributable to noncontrolling interests	111				(46		)		(268		)		74

	Preferred stock dividends	—				(3,651		)		(2,393		)		(10,952		)

	Cost on redemption of preferred stock	—				—				(6,531		)		—

	Net income allocable and distributions in excess of earnings to participating securities (continuing operations)	(333		)		(322		)		(989		)		(940		)
	Income / (loss) from continuing operations available to common stockholders - basic	3,914				2,436				26,452				(3,947		)


	Loss from discontinued operations	—				—				—				(4,370		)

	Loss from discontinued operations attributable to noncontrolling interests	—				—				—				82

	Loss from discontinued operations available to common stockholders - basic	—				—				—				(4,288		)


	Net income / (loss) available to common stockholders - basic	$	3,914			$	2,436			$	26,452			$	(8,235	)


	Diluted earnings per share:
	Income / (loss) from continuing operations available to common stockholders - basic	3,914				2,436				26,452				(3,947		)

	Income from continuing operations attributable to noncontrolling interests in Operating Partnership	118				53				534				—

	Income / (loss) from continuing operations available to common stockholders - diluted	4,032				2,489				26,986				(3,947		)


	Loss from discontinued operations available to common stockholders - basic and diluted	—				—				—				(4,288		)


	Net income / (loss) available to common stockholders - diluted	$	4,032			$	2,489			$	26,986			$	(8,235	)


	Weighted-average common shares outstanding:
	Basic	190,646,722				152,785,451				179,138,169				152,739,130

	Incremental shares from assumed conversion:
	Performance units	68,947				—				71,699				—

	Operating partnership and LTIP units	5,415,974				2,942,758				3,911,372				—

	Diluted	196,131,643				155,728,209				183,121,240				152,739,130


	Basic and diluted earnings per share:
	Income / (loss) from continuing operations per share available to common stockholders - basic and diluted	$	0.02			$	0.02			$	0.15			$	(0.02	)

	Loss from discontinued operations per share available to common stockholders - basic and diluted	$	—			$	—			$	—			$	(0.03	)

Net income / (loss) per share available to common stockholders - basic and diluted	$	0.02			$	0.02			$	0.15			$	(0.05	)

Earnings_Per_Unit_of_the_Opera

Earnings Per Unit of the Operating Partnership	9 Months Ended
	Sep. 30, 2013
Partnership Income [Abstract]	'
Earnings Per Unit of the Operating Partnership	'
	Earnings Per Unit of the Operating Partnership

	Through September 30, 2013, all of the Operating Partnership’s participating securities received distributions at an equal distribution rate per unit. As a result, the portion of net income allocable to the weighted-average unvested OP units outstanding for the three and nine months ended September 30, 2013 and 2012 has been deducted from net income available to unitholders to calculate basic earnings per unit. For the three and nine months ended September 30, 2013 and 2012, the unvested OP units were anti-dilutive to the calculation of earnings per unit and were therefore excluded from the calculation of diluted earnings per unit, and diluted earnings per unit is calculated based upon net income attributable to unitholders. For the three and nine months ended September 30, 2013, the Performance Units were dilutive to the calculation of diluted earnings per unit as calculated, assuming that September 30, 2013 was the end date of the Performance Units’ Performance Period. For the three and nine months ended September 30, 2012, the Performance Units were anti-dilutive to the calculation of diluted earnings per unit as calculated, assuming that September 30, 2012 was the end date of the Performance Units' Performance Period. In addition, 10,405,224 and 10,127,232 units issuable upon settlement of the exchange feature of the Exchangeable Senior Notes were anti-dilutive and were not included in the calculation of diluted earnings per unit based on the “if converted” method for the three and nine months ended September 30, 2013 and 2012, respectively. No other units were considered anti-dilutive for the three and nine months ended September 30, 2013 or 2012.

	Computations of basic and diluted earnings per unit (in thousands, except unit data) were as follows:



		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Basic and diluted earnings per unit:
	Income from continuing operations	$	4,136		$	6,455		$	36,633		$	7,871

	Loss from continuing operations attributable to noncontrolling interests	229			7			266			16

	Preferred unit distributions	—			(3,651		)	(2,393		)	(10,952		)

	Cost on redemption of preferred units	—			—			(6,531		)	—

	Net income allocable and distributions in excess of earnings to participating securities (continuing operations)	(333		)	(328		)	(993		)	(959		)
	Income / (loss) from continuing operations available to unitholders - basic and diluted	4,032			2,483			26,982			(4,024		)


	Loss from discontinued operations - basic and diluted	—			—			—			(4,370		)


	Net income / (loss) available to unitholders - basic and diluted	$	4,032		$	2,483		$	26,982		$	(8,394	)


	Weighted-average units outstanding:
	Basic	196,062,696			155,699,816			183,048,587			155,661,231

	Incremental units from assumed conversion:
	Performance units	68,947			—			71,699			—

	Diluted	196,131,643			155,699,816			183,120,286			155,661,231


	Basic and diluted earnings per unit:
	Income / (loss) from continuing operations per unit available to unitholders - basic and diluted	$	0.02		$	0.02		$	0.15		$	(0.02	)

	Loss from discontinued operations per share available to unitholders - basic and diluted	$	—		$	—		$	—		$	(0.03	)

	Net income / (loss) per unit available to unitholders, basic and diluted	$	0.02		$	0.02		$	0.15		$	(0.05	)

Investment_in_Unconsolidated_P

Investment in Unconsolidated Partnerships	9 Months Ended
Investment in Unconsolidated Partnerships	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Investment in Unconsolidated Partnerships	'
	Investment in Unconsolidated Partnerships

	The accompanying consolidated financial statements include investments in two limited liability companies with Prudential Real Estate Investors (“PREI”), 10165 McKellar Court, L.P. (“McKellar Court”), a limited partnership with Quidel Corporation, the tenant which occupies the McKellar Court property and BioPark Fremont, LLC ("BioPark Fremont"), a limited liability company with RPC Poppleton, LLC. General information on the PREI limited liability companies, the McKellar Court partnership, and BioPark Fremont (each referred to in this footnote individually as a “partnership” and collectively as the “partnerships”) as of September 30, 2013 was as follows:


	Name	Partner		Company’s	Company’s		Date Acquired
				Ownership	Economic
				Interest	Interest
	PREI I LLC (1)	PREI		20%	20%		April 4, 2007
	PREI II LLC	PREI		20%	20%		April 4, 2007
	McKellar Court (2)	Quidel Corporation		22%	22%		September 30, 2004
	BioPark Fremont (3)	RPC Poppleton, LLC		50%	50%		May 31, 2013
	____________


	-1	PREI I LLC owns two properties in Cambridge, Massachusetts. At September 30, 2013, there were $139.0 million in outstanding borrowings on a secured loan facility held by a wholly-owned subsidiary of PREI I LLC, with a contractual interest rate of 3.19% (including the applicable credit spread) and a maturity date of August 13, 2014.

	-2	The Company’s investment in the McKellar Court partnership (maximum exposure to losses) was approximately $12.1 million at September 30, 2013. The Company’s economic interest in the McKellar Court partnership entitles it to 75% of the extraordinary cash flows after repayment of the partners’ capital contributions and 22% of the operating cash flows.


	-3	The Company's partnership interest was acquired in connection with the Company's merger with Wexford.

	The condensed combined balance sheets for all of the Company’s unconsolidated partnerships were as follows (in thousands):



		September 30,			December 31,
		2013			2012
	Assets:
	Investments in real estate, net	$	260,411		$	257,666
	Investments in real estate, net	$	260,411		$	257,666
	Cash and cash equivalents (including restricted cash)	2,761			1,968
	Cash and cash equivalents (including restricted cash)	2,761			1,968
	Other assets	6,097			4,370
	Other assets	6,097			4,370
	Total assets	$	269,269		$	264,004
	Total assets	$	269,269		$	264,004
	Liabilities and members’ equity:
	Mortgage notes payable and secured loan	$	151,954		$	149,255
	Mortgage notes payable and secured loan	$	151,954		$	149,255
	Other liabilities	10,708			5,988
	Other liabilities	10,708			5,988
	Members’ equity	106,607			108,761
	Members’ equity	106,607			108,761
	Total liabilities and members equity	$	269,269		$	264,004
	Total liabilities and members equity	$	269,269		$	264,004
	Company’s net investment in unconsolidated partnerships	$	31,978		$	32,367
	Company’s net investment in unconsolidated partnerships	$	31,978		$	32,367

	The selected data and results of operations for the unconsolidated partnerships were as follows (in thousands):


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Total revenues	$	3,778		$	2,195		$	9,486		$	6,582
	Total revenues	$	3,778		$	2,195		$	9,486		$	6,582
	Total expenses	(5,328		)	(4,975		)	(16,013		)	(14,756		)
	Net loss	(1,550		)	(2,780		)	(6,527		)	(8,174		)

	Company’s equity in net loss of unconsolidated partnerships	$	(112	)	$	(339	)	$	(697	)	$	(1,011	)

	Fees earned by the Company (1)	$	35		$	22		$	121		$	67
	Fees earned by the Company (1)	$	35		$	22		$	121		$	67
____________


-1	The Company acts as the operating member or partner, as applicable, and day-to-day manager for the partnerships. The Company is entitled to receive fees for providing construction and development services (as applicable) and management services to the PREI joint ventures, which are reflected in tenant recoveries and other income in the consolidated statements of operations.

Derivatives_and_Other_Financia

Derivatives and Other Financial Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives and Other Financial Instruments	'
	Derivatives and Other Financial Instruments

	The Company is exposed to the effect of changes in interest rates on the Operating Partnership’s U.S. dollar-LIBOR-based and GBP-LIBOR-based debt. The Company limits this risk by following established risk management policies and procedures including the use of derivatives. The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements related to the Operating Partnership’s LIBOR-based debt. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The interest rate swaps hedge the Company’s exposure to the variability on expected cash flows attributable to changes in interest rates. These interest rate swaps are currently intended to hedge interest payments associated with the Operating Partnership’s Term Loan due 2017 and Term Loan due 2018.

	On September 25, 2013, the Operating Partnership entered into three interest rate swaps with an aggregate notional amount of $200.0 million under which at each monthly settlement date the Company either (1) receives the difference between a fixed interest rate (the “Strike Rate”) and one-month U.S. dollar -LIBOR if the Strike Rate is less than one-month U.S. dollar-LIBOR or (2) pays such difference if the Strike Rate is greater than one-month U.S. dollar-LIBOR. The interest rate swaps hedge the Company’s exposure to the variability on expected cash flows attributable to changes in interest rates on the first interest payments, due date on or after each swap’s settlement date, associated with the amount of one-month U.S. dollar LIBOR-based debt equal to each swap’s notional amount. These interest rate swaps, with a notional amount of $200.0 million, are currently intended to hedge interest payments associated with the Operating Partnership’s Term Loan due 2018 for three years. No initial investment was made to enter into the interest rate swap agreements.

	As of September 30, 2013, the Company had deferred interest costs of approximately $37.1 million in accumulated other comprehensive loss related to forward starting swaps, which were settled with the corresponding counterparties in 2009. The forward starting swaps were entered into to mitigate the Company’s exposure to the variability in expected future cash flows attributable to changes in future interest rates associated with a forecasted issuance of fixed-rate debt, with interest payments for a minimum of ten years. The deferred interest costs will be amortized as additional interest expense over a remaining period of approximately five years.

	The following is a summary of the terms of the interest rate swaps and their respective fair-values (dollars in thousands):



											Fair-Value(1)
		Notional Amount									September 30,				December 31,
					Strike Rate			Effective Date		Expiration Date	2013				2012
	Interest rate swaps	$	200,000		1.163	%		March 30, 2012		March 30, 2017	$	(2,291	)		$	(4,826	)

	Interest rate swaps	200,000			0.701	%		October 1, 2013		October 1, 2016	(330		)		—

	Interest rate swaps(2)	80,815			0.731	%		August 2, 2012		March 30, 2017	890				(216		)

	Interest rate swaps(2)	80,815			0.7425	%		August 2, 2012		March 30, 2017	866				(243		)

	Total interest rate swaps	$	561,630								$	(865	)		$	(5,285	)

	____________


	-1	Fair-value of derivative instruments does not include any related accrued interest payable, which is included in accrued expenses on the accompanying consolidated balance sheets. Derivative valuations are classified in Level 2 of the fair-value hierarchy. Assets are included in other assets and liabilities are included in accounts payable, accrued expenses and other liabilities on the accompanying consolidated balance sheets.

	-2	Translation to U.S. dollars is based on an exchange rate of $1.62 to £1.00 at both September 30, 2013 and December 31, 2012.

	For derivatives designated as cash flow hedges, the effective portion of changes in the fair-value of the derivative is initially reported in other comprehensive income (outside of earnings) and subsequently reclassified to earnings in the period in which the hedged forecasted transaction affects earnings. During the three months ended September 30, 2013 and 2012, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair-value of the derivatives is recognized directly in earnings. No portion of the derivatives designated as cash flow hedges were classified as ineffective during the three months ended September 30, 2013 and 2012.

	The following is a summary of the amount of (loss) / gain recognized in other comprehensive income related to the derivative instruments (in thousands):



		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2013			2012				2013			2012
	Amount of (loss) / gain recognized in other comprehensive income (effective portion):
	Cash flow hedges
	Interest rate swaps	$	(1,371	)	$	(2,523	)		$	2,653		$	(6,701	)


	Amount of loss reclassified from accumulated other comprehensive loss to income (effective portion):
	Cash flow hedges
	Interest rate swaps (1)	$	600		$	522			$	1,752		$	999

	Forward starting swaps (2)	1,705			1,730				5,134			5,209

	Total interest rate swaps	$	2,305		$	2,252			$	6,886		$	6,208

	____________


	-1	Amount represents payments made to swap counterparties for the effective portion of interest rate swaps that were recognized as an increase to interest expense for the periods presented (the amount was recorded as an increase and corresponding decrease to accumulated other comprehensive loss in the same accounting period).

	-2	Amount represents reclassifications of deferred interest costs from accumulated other comprehensive loss to interest expense related to the Company’s previously settled forward starting swaps.

	During the next twelve months, the Company estimates that an additional $10.0 million will be reclassified from accumulated other comprehensive loss as an increase to interest expense.

FairValue_of_Financial_Instrum

Fair-Value of Financial Instruments	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures	'
	Fair-Value of Financial Instruments

	The Company’s disclosures of estimated fair-value of financial instruments at September 30, 2013 and December 31, 2012 were determined using available market information and appropriate valuation methods. Considerable judgment is necessary to interpret market data and develop estimated fair-value. The use of different market assumptions or estimation methods may have a material effect on the estimated fair-value amounts.

	The carrying amounts for cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other liabilities approximate fair-value due to the short-term nature of these instruments.

	The Company utilizes quoted market prices to estimate the fair-value of its fixed-rate and variable-rate debt, when available. If quoted market prices are not available, the Company calculates the fair-value of its mortgage notes payable and other fixed-rate debt based on a currently available market rate assuming the loans are outstanding through maturity and considering the collateral. In determining the current market rate for fixed-rate debt, a market credit spread is added to the quoted yields on federal government treasury securities with similar terms to debt. In determining the current market rate for variable-rate debt, a market credit spread is added to the current effective interest rate. The carrying values of interest rate swaps are reflected at their fair-values.

	At September 30, 2013 and December 31, 2012, the aggregate fair-value and the carrying value of the Company’s financial instruments were as follows (in thousands):



		September 30, 2013				December 31, 2012
		Fair-Value (1)		Carrying Value		Fair-Value (1)		Carrying Value
	Mortgage notes payable, net	$	738,873	$	716,733	$	605,948	$	571,652

	Exchangeable Senior Notes	205,434		180,000		209,484		180,000

	Notes due 2016, net	418,640		398,659		421,400		398,289

	Notes due 2020, net	276,625		248,151		292,725		247,984

	Notes due 2022, net	242,125		248,040		261,750		247,904

	Term Loan due 2017 - U.S. dollar	244,837		243,596		243,596		243,596

	Term Loan due 2017 - GBP (2)	162,449		161,630		161,860		161,860

	Term Loan due 2018	350,000		350,000		—		—

	Unsecured line of credit	20,000		20,000		118,000		118,000

	Derivative instruments (3)	865		865		5,285		5,285

	Available-for-sale securities	17,391		17,391		390		390

	____________


	-1	Fair-values of debt and derivative instruments are classified in Level 2 of the fair-value hierarchy. Fair-value of available-for-sale securities are classified in Level 1 of the fair-value hierarchy.

	-2	The principal balance represents the U.S. dollar amount based on the exchange rate of $1.62 to £1.00 at both September 30, 2013 and December 31, 2012.

	-3	The Company’s derivative instruments are reflected in other assets and in accounts payable, accrued expenses and other liabilities on the accompanying consolidated balance sheets based on their respective balances (see Note 9).

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2013
Business Combinations [Abstract]	'
Business Combination Disclosure	'
	Acquisitions

	The Company acquired the following properties during the nine months ended September 30, 2013. The table below reflects the purchase price allocation for these acquisitions and excludes the merger with Wexford, which is discussed below (in thousands):



	Property		Acquisition Date	Investments in Real Estate			In-Place Lease		Management			Below Market Lease			Acquisition Date Fair- Value
	Property		Acquisition Date	Investments in Real Estate			In-Place Lease		Agreement			Below Market Lease			Acquisition Date Fair- Value
	Woodside Technology Park		February 28, 2013	$	78,681		$	8,162	$	865		$	(708	)	$	87,000
	Woodside Technology Park		February 28, 2013	$	78,681		$	8,162	$	865		$	(708	)	$	87,000
	The Campus at Lincoln Centre		March 20, 2013	37,000			—		—			—			37,000
	The Campus at Lincoln Centre		March 20, 2013	37,000			—		—			—			37,000
	320 Charles Street		June 18, 2013	47,018			4,578		—			(2,078		)	49,518
	320 Charles Street		June 18, 2013	47,018			4,578		—			(2,078		)	49,518
	Total			$	162,699		$	12,740	$	865		$	(2,786	)	$	173,518
	Total			$	162,699		$	12,740	$	865		$	(2,786	)	$	173,518
	Weighted average intangible amortization life (in months)						61		108			18
	Weighted average intangible amortization life (in months)						61		108			18

	Wexford Merger

	On May 31, 2013, the Company completed a merger with Wexford. The preliminary purchase price allocations of the fair-value of assets acquired, liabilities assumed and consideration paid in the Wexford merger are presented below (in thousands). The Company expects the purchase price allocations to be finalized within one year of the acquisition date.


		At Acquisition
	Assets:
	Investments in real estate	$	663,969
	Investments in real estate	$	663,969
	Cash and cash equivalents	5,182
	Cash and cash equivalents	5,182
	Accounts receivable, net	937
	Accounts receivable, net	937
	Deferred leasing costs (1)	50,555
	Deferred leasing costs (1)	50,555
	Other assets (2)	82,825
	Other assets (2)	82,825
	Total assets	$	803,468
	Total assets	$	803,468
	Liabilities:
	Mortgage notes payable (3)	254,735
	Mortgage notes payable (3)	254,735
	Other liabilities (4)	64,201
	Other liabilities (4)	64,201
	Total liabilities	$	318,936
	Total liabilities	$	318,936

	Fair value of net assets acquired	$	484,532
	Fair value of net assets acquired	$	484,532

	Cash consideration paid for Wexford	$	345,268
	Cash consideration paid for Wexford	$	345,268
	Equity consideration paid for Wexford (5)	123,596
	Equity consideration paid for Wexford (5)	123,596
	Contingent consideration in merger with Wexford (6)	15,668
	Contingent consideration in merger with Wexford (6)	15,668
	Total consideration for Wexford	$	484,532
	Total consideration for Wexford	$	484,532
	____________


	-1	$50.6 million of acquired in-place leases with a weighted-average lease term of approximately 10.3 years are included in deferred leasing costs.

	-2	$9.6 million of acquired above-market leases with a weighted-average lease term of approximately 11.6 years and $8.5 million of acquired below-market ground leases with a weighted-average lease term of approximately 45.0 years are included in other assets.

-3	$8.7 million of debt premiums with a weighted-average term of approximately 9.2 years are included in mortgage notes payable, net.

-4	$31.4 million of acquired below-market leases with a weighted-average lease term of approximately 13.4 years and $1.4 million of acquired above-market ground leases with a weighted-average lease term of approximately 64.8 years are included in other liabilities.

-5	Consists of 5,568,227 shares of the Parent Company's common stock and 336,960 operating partnership units.

-6	Includes potential additional consideration to be paid to the seller upon the achievement of certain pipeline development milestones.

Wexford - Variable Interest Entities

Wexford is a party to certain contractual arrangements with tax credit investors (“TCIs”) that were established to enable the TCIs to receive the benefits of historic tax credits (“HTCs”) and/or new market tax credits (“NMTCs”) for certain properties owned by Wexford. At May 31, 2013, Wexford owned seven properties that had syndicated HTCs or NMTCs, or both, to TCIs.

Historic Tax Credits and New Market Tax Credits

Capital contributions are made by TCIs into special purpose entities that ultimately invest these funds in the entity that owns the subject property that generates the tax credits. The TCIs are allocated substantially all of the tax credits and hold only a noncontrolling interest in the economic risk and rewards of the special purpose entities. HTCs are delivered to the TCI upon substantial completion of the project. NMTCs are allowed for up to 39% of a qualified investment and are delivered to the TCI after the investment has been funded and spent on a qualified business. HTCs are subject to 20% recapture per year beginning one year after the completion of the historic rehabilitation of the subject property. NMTCs are subject to 100% recapture until the end of the seventh year following the qualifying investment. The Company has provided the TCIs with certain guarantees which protect the TCIs from loss should a tax credit recapture event occur. The contractual arrangements with the TCIs include a put/call provision whereby the Company may be obligated or entitled to repurchase the ownership interest of the TCIs in the special purpose entities at the end of the tax credit recapture period. The Company anticipates that either the TCIs will exercise their put rights or the Company will exercise its call rights; however, the Company believes that the put rights are more likely to be exercised.

The Company has determined that the special purpose entities are VIEs, since there is insufficient capital to finance their activities without further subordinated financial support. The Company has determined that it is the primary beneficiary of these VIEs, because it has the authority to direct the activities which most significantly impact their economic performance.

The portion of the TCI’s capital contribution that is attributed to the put is recorded at fair-value at inception and is accreted to the expected put price as interest expense in the consolidated statement of operations. At September 30, 2013, approximately $3.7 million of put liabilities were included in other liabilities in the consolidated balance sheets. The remaining balance of the TCI’s capital contribution is initially recorded in other liabilities in the consolidated balance sheets and will be relieved, upon delivery of the tax credit to the TCI, as a reduction in the carrying value of the subject property, net of allocated expenses. During the nine months ended September 30, 2013, $12.3 million of tax credits, net of costs and estimated put payments, were contributed by TCIs which were recorded as other liabilities in the consolidated balance sheets, of which $4.1 million of tax credits have been delivered to the TCIs and were reclassified as a reduction of the carrying value of the subject property. Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as an increase in the cost basis of the subject property upon the recognition of the related tax credit as discussed above. Subsequent to quarter end, $5.0 million of tax credits, net of costs, were contributed by and delivered to TCIs and were recorded as a reduction of the carrying value of the subject property.

The Company has determined that certain special purpose entities owning properties under development are VIEs, since there is insufficient capital to finance the remaining development activities without further subordinated financial support. The Company has determined it is the primary beneficiary of these VIEs, because it has the authority to direct the activities which most significantly impact their economic performance. Selected financial data of the VIEs at September 30, 2013 consisted of the following (in thousands):



	September 30,
	2013
Investment in real estate, net	$	148,660
Investment in real estate, net	$	148,660
Total assets	148,662
Total assets	148,662
Total liabilities	64,314
Total liabilities	64,314

Pro Forma Results of the Parent Company

The unaudited pro forma revenues and operating income of the Parent Company, including the acquisitions that occurred in 2013 as if they had taken place on January 1, 2012, are as follows (in thousands, except per share amounts):



	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2013			2012			2013		2012
	2013			2012			2013		2012
Total revenues	$	159,232		$	152,599		$	508,911	$	433,581
Total revenues	$	159,232		$	152,599		$	508,911	$	433,581
Net income / (loss) available to common stockholders	4,247			(2,362		)	26,702		(20,763		)
Net income / (loss) available to common stockholders	4,247			(2,362		)	26,702		(20,763		)
Net income / (loss) per share available to common stockholders - basic and diluted	$	0.02		$	(0.02	)	$	0.15	$	(0.14	)
	$	0.02		$	(0.02	)	$	0.15	$	(0.14	)

Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2012, nor is it intended to be a projection of future results.

Pro Forma Results of the Operating Partnership

The unaudited pro forma revenues and operating income of the Operating Partnership, including the acquisitions that occurred in 2013 as if they had taken place on January 1, 2012, are as follows (in thousands, except per unit amounts):



	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2013			2012			2013		2012
	2013			2012			2013		2012
Total revenues	$	159,232		$	152,599		$	508,911	$	433,581
Total revenues	$	159,232		$	152,599		$	508,911	$	433,581
Net income / (loss) available to unitholders	4,365			(2,309		)	27,236		(20,903		)
Net income / (loss) available to unitholders	4,365			(2,309		)	27,236		(20,903		)
Net income / (loss) per share available to unitholders - basic and diluted	$	0.02		$	(0.02	)	$	0.15	$	(0.14	)
	$	0.02		$	(0.02	)	$	0.15	$	(0.14	)

Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2012, nor is it intended to be a projection of future results.

Revenues of approximately $18.7 million and net loss of approximately $512,000 associated with properties acquired in 2013 listed above are included in the consolidated statements of operations for the three months ended September 30, 2013 for both the Parent Company and the Operating Partnership.

Revenues of approximately $27.0 million and net income of approximately $12,000 associated with properties acquired in 2013 listed above are included in the consolidated statements of operations for the nine months ended September 30, 2013 for both the Parent Company and the Operating Partnership.

Discontinued_Operations

Discontinued Operations

9 Months Ended

Sep. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

In April 2012, the Company completed the exchange of an operating property on Forbes Boulevard in South San Francisco for an office property located in Redwood City, California. As a result, during the nine months ended September 30, 2012, the Company reclassified the Forbes Boulevard property as a discontinued operation. The table below reflects the details of the property and the exchange (in thousands):

Property

Date of Sale

Original Acquisition Date

Sales Price (1)

Impairment loss

Forbes Boulevard

April 27, 2012

September 5, 2007

28,000

(4,552

)

_________

-1

The sales price was equal to the fair-value of the office property received as consideration in the exchange with the independent third party.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation

	The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, partnerships and limited liability companies it controls, and variable interest entities (“VIEs”) for which the Company has determined itself to be the primary beneficiary. All material intercompany transactions and balances have been eliminated. The Company consolidates entities the Company controls and records a noncontrolling interest for the portions not owned by the Company. Control is determined, where applicable, by the sufficiency of equity invested and the rights of the equity holders, and by the ownership of a majority of the voting interests, with consideration given to the existence of approval or veto rights granted to the minority stockholder. If the minority stockholder holds substantive participating rights, it overcomes the presumption of control by the majority voting interest holder. In contrast, if the minority stockholder simply holds protective rights (such as consent rights over certain actions), it does not overcome the presumption of control by the majority voting interest holder.

	Assets and liabilities of subsidiaries outside the United States with non-U.S. dollar functional currencies are translated into U.S. dollars using exchange rates as of the balance sheet dates. Income and expenses are translated using the average exchange rates for the reporting period. Foreign currency translation adjustments are recorded as a component of other comprehensive income. For the three months ended September 30, 2013 and 2012, total revenues from properties outside the United States were $4.5 million and $4.4 million, respectively, which represented 2.8% and 3.3% of the Company’s total revenues during the respective periods. For the nine months ended September 30, 2013 and 2012, total revenues from properties outside the United States were $13.5 million and $5.3 million, respectively, which represented 2.8% and 1.4% of the Company's total revenues during the respective periods. The Company’s net investment in properties outside the United States was $190.5 million and $188.8 million at September 30, 2013 and December 31, 2012, respectively.
Investments in Partnerships and Limited Liability Companies	'
	Investments in Partnerships and Limited Liability Companies

	The Company has determined that it is the primary beneficiary in five VIEs, consisting of single-tenant properties in which the tenant has a fixed-price purchase option, which are consolidated and reflected in the accompanying consolidated financial statements. Selected financial data of the VIEs at September 30, 2013 and December 31, 2012 consist of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Investment in real estate, net	$	332,004		$	334,331

	Total assets	371,341			369,460

	Total debt	143,538			144,889

	Total liabilities	152,051			149,336


	The Company is also a party to certain VIEs through its ownership of Wexford, which are described in further detail in Note 11.
Investments in Real Estate, Net	'
	Investments in Real Estate, Net

	Investments in real estate, net consisted of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Land	$	692,633		$	702,993

	Land under development	133,372			48,744

	Buildings and improvements	4,771,874			4,028,089

	Construction in progress	311,296			143,340

		5,909,175			4,923,166

	Accumulated depreciation	(737,073		)	(603,450		)
		$	5,172,102		$	4,319,716

Impairment of Long-Lived Assets and Long-Lived Assets to be Disposed	'
	Impairment of Long-Lived Assets and Long-Lived Assets to be Disposed

	The Company reviews long-lived assets and certain identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. The review of recoverability is based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the long-lived asset’s use and eventual disposition. These cash flows consider factors such as expected future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a long-lived asset, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair-value of the property. The Company is required to make subjective assessments as to whether there are impairments in the values of its investments in long-lived assets. These assessments have a direct impact on the Company’s net income because recording an impairment loss results in an immediate negative adjustment to net income. 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. Although the Company’s strategy is to hold its properties over the long-term, if the Company’s strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized to reduce the property to the lower of the carrying amount or fair-value, and such loss could be material.

	In April 2012, the Company completed the exchange of a property for another real estate operating property. As a result, the property disposed of was reclassified as a discontinued operation. This property was written down to its estimated fair-value of $28.0 million, less costs to sell, which resulted in an impairment loss of $4.6 million that is included in loss from discontinued operations for the nine months ended September 30, 2012. The parties to the exchange determined and agreed upon the fair-value of the property received in the transaction, which the Company considers to be a level 2 input in the fair-value hierarchy. See Note 12 for discussion of discontinued operations.
Deferred Leasing Costs, Net	'
	Deferred Leasing Costs, Net

	Leasing commissions and other direct costs associated with obtaining new or renewal leases are recorded at cost and amortized on a straight-line basis over the terms of the respective leases, with remaining terms ranging from less than one year to approximately 20 years as of September 30, 2013. Deferred leasing costs also include the net carrying value of acquired in-place leases and acquired management agreements.

	Deferred leasing costs, net at September 30, 2013 consisted of the following (in thousands):


		Balance at			Accumulated
		September 30, 2013			Amortization			Net
	Acquired in-place leases	$	368,733		$	(225,811	)	$	142,922

	Acquired management agreements	25,801			(19,677		)	6,124

	Deferred leasing and other direct costs	82,205			(28,858		)	53,347

		$	476,739		$	(274,346	)	$	202,393


	Deferred leasing costs, net at December 31, 2012 consisted of the following (in thousands):


		Balance at			Accumulated
		31-Dec-12			Amortization			Net
	Acquired in-place leases	$	303,521		$	(185,463	)	$	118,058

	Acquired management agreements	24,963			(15,242		)	9,721

	Deferred leasing and other direct costs	68,175			(23,591		)	44,584

		$	396,659		$	(224,296	)	$	172,363

Investments	'
	Investments

	Investments in equity securities, which are included in other assets on the accompanying consolidated balance sheets, consisted of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Available-for-sale securities, historical cost	$	8,840		$	275

	Unrealized gain, net	8,551			115

	Available-for-sale securities, fair-value (1)	17,391			390

	Privately-held securities, cost basis	13,130			12,280

	Total equity securities	$	30,521		$	12,670

	____________

	-1	Determination of fair-value is classified as Level 1 in the fair-value hierarchy based on the use of quoted prices in active markets.

	The Company holds investments in available-for-sale securities of certain publicly traded companies. Certain of these investments have fair-values less than the Company’s cost basis, net of previous other-than-temporary impairment in these securities due to decreases in their respective stock prices during the nine months ended September 30, 2013. However, management has the intent and ability to retain the investments for a period of time sufficient to allow for an anticipated recovery in their market value. Management will continue to periodically evaluate whether any investment, the fair-value of which is less than the Company’s cost basis, should be considered other-than-temporarily impaired. If other-than-temporary impairment is considered to exist, the related unrealized loss will be reclassified from accumulated other comprehensive loss and recorded as a reduction of net income.

	The Company also holds investments in securities of certain privately-held companies and funds, which are recorded at cost basis due to the Company’s lack of control or significant influence over such companies and funds.

	During the nine months ended September 30, 2013, the Company recorded a $2.8 million impairment charge, which is included in other expense in the consolidated statements of operations. The impairment charge related to the Company’s investment in a privately-held company, comprising a $2.0 million cost basis equity investment and $825,000 related to notes receivable that were included in other assets on the consolidated balance sheets. Other than this investment there were no identified events or changes in circumstances that may have a significant adverse effect on the carrying value of the Company’s cost basis investments and therefore, no evaluation of impairment was performed during the nine months ended September 30, 2013 on the Company’s remaining cost basis investments.
Construction Loan Receivable	'
	Construction Loan Receivable

	The Company has a $255.0 million interest in a $355.0 million construction loan secured by first priority mortgages on a 1.1 million square foot laboratory, office and retail development project located in Boston, Massachusetts, which is 95% leased to Vertex Pharmaceuticals Incorporated to serve as its new corporate headquarters.

	The construction loan matures on September 30, 2014, with two one-year extension options exercisable at the borrower’s election after paying the lenders an extension fee on the then-outstanding principal amount. The construction loan bears interest on the outstanding principal amount at a floating rate equal to the greater of (1) reserve adjusted LIBOR plus 550 basis points and (2) 6.5%. In addition, the borrower is required to pay a fee to the lenders based on a specified percentage of the average daily unfunded amount of the construction loan. The borrower may prepay the construction loan in part under certain circumstances, and may prepay the construction loan in full with prior notice and a prepayment fee to the lenders. As of September 30, 2013, the Company had invested approximately $120.9 million in the construction loan, which is included in other assets on the Company's consolidated balance sheet. The Company expects to have fully funded its obligation in early 2014.
Lease Termination	'
	Lease Termination

	During the three and nine months ended September 30, 2013, the Company recorded lease termination revenue, net of write-offs of lease intangibles, included in other revenue on the consolidated statement of operations of approximately $1.5 million and $42.8 million, respectively. Lease termination revenue related to the termination of a lease with Elan Corporation (“Elan”) at the Company’s Science Center at Oyster Point property for which Elan paid the Company $46.5 million, and the termination of a lease effective August 2013 with Merck at the Company's 320 Bent Street property for which Merck paid the Company $8.7 million in August 2012.
Management's Estimates	'
	Management’s Estimates

	Management has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reporting of revenue and expenses during the reporting period to prepare these consolidated financial statements in conformity with GAAP. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and reported amounts of revenue and expenses that are not readily apparent from other sources. Actual results could differ from those estimates under different assumptions or conditions.

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Selected Financial Data of the VIEs	'
	Selected financial data of the VIEs at September 30, 2013 and December 31, 2012 consist of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Investment in real estate, net	$	332,004		$	334,331

	Total assets	371,341			369,460

	Total debt	143,538			144,889

	Total liabilities	152,051			149,336

	The Company has determined that certain special purpose entities owning properties under development are VIEs, since there is insufficient capital to finance the remaining development activities without further subordinated financial support. The Company has determined it is the primary beneficiary of these VIEs, because it has the authority to direct the activities which most significantly impact their economic performance. Selected financial data of the VIEs at September 30, 2013 consisted of the following (in thousands):



		September 30,
		2013
	Investment in real estate, net	$	148,660

	Total assets	148,662

	Total liabilities	64,314

Investments in Real Estate, Net	'
	Investments in real estate, net consisted of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Land	$	692,633		$	702,993

	Land under development	133,372			48,744

	Buildings and improvements	4,771,874			4,028,089

	Construction in progress	311,296			143,340

		5,909,175			4,923,166

	Accumulated depreciation	(737,073		)	(603,450		)
		$	5,172,102		$	4,319,716

Deferred Leasing Costs, Net	'
	Deferred leasing costs, net at September 30, 2013 consisted of the following (in thousands):


		Balance at			Accumulated
		September 30, 2013			Amortization			Net
	Acquired in-place leases	$	368,733		$	(225,811	)	$	142,922

	Acquired management agreements	25,801			(19,677		)	6,124

	Deferred leasing and other direct costs	82,205			(28,858		)	53,347

		$	476,739		$	(274,346	)	$	202,393


	Deferred leasing costs, net at December 31, 2012 consisted of the following (in thousands):


		Balance at			Accumulated
		31-Dec-12			Amortization			Net
	Acquired in-place leases	$	303,521		$	(185,463	)	$	118,058

	Acquired management agreements	24,963			(15,242		)	9,721

	Deferred leasing and other direct costs	68,175			(23,591		)	44,584

		$	396,659		$	(224,296	)	$	172,363

Investments	'
	Investments in equity securities, which are included in other assets on the accompanying consolidated balance sheets, consisted of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Available-for-sale securities, historical cost	$	8,840		$	275

	Unrealized gain, net	8,551			115

	Available-for-sale securities, fair-value (1)	17,391			390

	Privately-held securities, cost basis	13,130			12,280

	Total equity securities	$	30,521		$	12,670

	____________

	-1	Determination of fair-value is classified as Level 1 in the fair-value hierarchy based on the use of quoted prices in active markets.

Equity_of_the_Parent_Company_T

Equity of the Parent Company (Tables)	9 Months Ended
	Sep. 30, 2013
Equity of the Parent Company	'
Dividends and Distributions	'
	The following table lists the dividends and distributions declared by the Parent Company and the Operating Partnership during the nine months ended September 30, 2013:



	Declaration Date		Securities Class		Amount Per				Period Covered		Dividend and		Dividend and
					Share/Unit						Distribution		Distribution Amount
											Payable Date
													(In thousands)
	March 15, 2013		Common stock and OP units		$	0.235			January 1, 2013 to March 31, 2013		April 15, 2013		$	40,413

	June 14, 2013		Common stock and OP units		$	0.235			April 1, 2013 to June 30, 2013		July 15, 2013		$	46,381

	September 16, 2013		Common stock and OP units		$	0.235			July 1, 2013 to September 30, 2013		October 15, 2013		$	46,418


	Total 2013 dividends and distributions declared through September 30, 2013 (in thousands):



	Common stock and OP units	$	133,212

	Series A preferred stock/units (1)	2,393

		$	135,605

	____________


	-1	On March 15, 2013, the Company redeemed all 7,920,000 outstanding shares of its Series A preferred stock for approximately $198.0 million, or $25.00 per share, net of accrued dividends of approximately $2.4 million, or $0.30217 per share.
Changes in Accumulated Other Comprehensive Loss by Component	'
	Changes in Accumulated Other Comprehensive Loss by Component



		Foreign currency translation adjustments				Unrealized gains on available- for-sale securities				Gain / (loss) on derivative instruments				Total

	Balance at December 31, 2012	$	3,611			$	115			$	(56,803	)		$	(53,077	)

	Other comprehensive (loss) / income before reclassifications	(252		)		8,435				2,653				10,836

	Amounts reclassified from accumulated other comprehensive income (1)	—				—				6,886				6,886

	Net other comprehensive (loss) / income	(252		)		8,435				9,539				17,722

	Balance as of September 30, 2013	$	3,359			$	8,550			$	(47,264	)		$	(35,355	)

	____________


	-1	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.
Vested Ownership Interests	'
	The following table shows the vested ownership interests in the Operating Partnership:



		September 30, 2013						December 31, 2012
		Operating Partnership Units and LTIP Units			Percentage of Total			Operating Partnership Units and LTIP Units			Percentage of Total
	BioMed Realty Trust	190,676,810			97.3	%		152,853,368			98.1	%

	Noncontrolling interest consisting of:
	Operating partnership and LTIP units held by employees and related parties	2,656,388			1.4	%		2,339,314			1.5	%

	Operating partnership and LTIP units held by third parties	2,627,145			1.3	%		565,051			0.4	%

	Total	195,960,343			100	%		155,757,733			100	%

Parent Company	'
Equity of the Parent Company	'
Changes in Accumulated Other Comprehensive Loss by Component	'
	Changes in Accumulated Other Comprehensive Loss by Component



		Foreign currency translation adjustments				Unrealized gains / (losses) on available-for-sale securities				Gain / (loss) on derivative instruments				Total

	Balance at December 31, 2012	$	3,543			$	114			$	(58,382	)		$	(54,725	)

	Other comprehensive (loss) / income before reclassifications	(252		)		8,435				2,653				10,836

	Amounts reclassified from accumulated other comprehensive income (1)	—				—				6,886				6,886

	Net other comprehensive (loss) / income	(252		)		8,435				9,539				17,722

	Net other comprehensive loss allocable to noncontrolling interests	(15		)		(1,360		)		(240		)		(1,615		)
	Balance as of September 30, 2013	$	3,276			$	7,189			$	(49,083	)		$	(38,618	)

	____________


	-1	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Capital_of_the_Operating_Partn1

Capital of the Operating Partnership Capital of the Operating Partnership (Tables)	9 Months Ended
	Sep. 30, 2013
Statement of Partners' Capital [Abstract]	'
Changes in Accumulated Other Comprehensive Loss by Component	'
	Changes in Accumulated Other Comprehensive Loss by Component



		Foreign currency translation adjustments			Unrealized gains on available- for-sale securities		Gain / (loss) on derivative instruments			Total

	Balance at December 31, 2012	$	3,611		$	115	$	(56,803	)	$	(53,077	)

	Other comprehensive (loss) / income before reclassifications	(252		)	8,435		2,653			10,836

	Amounts reclassified from accumulated other comprehensive income (1)	—			—		6,886			6,886

	Net other comprehensive (loss) / income	(252		)	8,435		9,539			17,722

	Balance as of September 30, 2013	$	3,359		$	8,550	$	(47,264	)	$	(35,355	)

	____________


	-1	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Summary of the Operating Partnership's Outstanding Consolidated Debt	'
	The following is a summary of the Operating Partnership’s outstanding consolidated debt as of September 30, 2013 and December 31, 2012 (dollars in thousands):



		Stated Interest Rate		Effective Interest Rate		Principal Balance
						September 30,			December 31,			Maturity Date
						2013			2012
	Mortgage Notes Payable
	9900 Belward Campus Drive	5.64	%	3.99	%	$	10,666		$	10,767		July 1, 2017

	9901 Belward Campus Drive	5.64	%	3.99	%	13,135			13,260			July 1, 2017

	Center for Life Science \| Boston	7.75	%	7.75	%	335,476			338,447			June 30, 2014

	4320 Forest Park Avenue (1)	4	%	2.7	%	21,000			—			June 30, 2015

	Heritage @ 4240 (2)	3.18	%	3.18	%	4,194			—			December 26, 2015

	Hershey Center for Applied Research (1)	6.15	%	4.71	%	13,568			—			May 5, 2027

	500 Kendall Street (Kendall D)	6.38	%	5.45	%	58,500			60,164			December 1, 2018

	Shady Grove Road	5.97	%	5.97	%	143,538			144,889			September 1, 2016

	University of Maryland BioPark I (1)	5.93	%	4.69	%	16,915			—			May 15, 2025

	University of Maryland BioPark II (1)	5.2	%	4.33	%	63,198			—			September 5, 2021

	University of Maryland BioPark Garage (1)	5.2	%	4.33	%	4,757			—			September 1, 2021

	University of Miami Life Science & Technology Park (1)	4	%	2.89	%	20,000			—			February 1, 2016

						704,947			567,527

	Unamortized premiums					11,786			4,125

	Mortgage notes payable, net					716,733			571,652

	Exchangeable Senior Notes	3.75	%	3.75	%	180,000			180,000			January 15, 2030

	Notes due 2016	3.85	%	3.99	%	400,000			400,000			April 15, 2016

	Notes due 2020	6.13	%	6.27	%	250,000			250,000			April 15, 2020

	Notes due 2022	4.25	%	4.36	%	250,000			250,000			July 15, 2022

						900,000			900,000

	Unamortized discounts					(5,150		)	(5,823		)
	Unsecured senior notes, net					894,850			894,177

	Term Loan due 2017 - U.S. dollar (3)	1.83	%	2.64	%	243,596			243,596			March 30, 2017

	Term Loan due 2017 - GBP (3)	2.14	%	2.39	%	161,630			161,860			March 30, 2017

	Term Loan due 2018 (4)	1.68	%	1.68	%	350,000			—			March 24, 2018

	Unsecured senior term loans					755,226			405,456

	Unsecured line of credit (4) (5)	1.48	%	1.48	%	20,000			118,000			March 24, 2018

	Total consolidated debt					$	2,566,809		$	2,169,285

____________


-1	Mortgage notes which were assumed on May 31, 2013 in connection with the Company’s merger with Wexford.

-2	In October 2013, the Operating Partnership voluntarily repaid in full the outstanding mortgage note pertaining to the Heritage @ 4240 property prior to the scheduled maturity.

-3	In August 2012, the Operating Partnership converted approximately $156.4 million of outstanding borrowings into British pounds sterling (“GBP”) equal to £100.0 million, which was designated as a net investment hedge to mitigate the risk of fluctuations in foreign currency exchange rates. The principal balance represents the U.S. dollar amount based on the exchange rate of $1.62 to £1.00 at both September 30, 2013 and December 31, 2012. The effective interest rate includes the impact of interest rate swap agreements (see Note 9 for further discussion of interest rate swap agreements).

-4	In September 2013, the Operating Partnership amended and restated its unsecured credit agreement, providing for aggregate borrowing of up to $1.25 billion, consisting of an unsecured line of credit of $900.0 million and a term loan of $350.0 million (the Term Loan due 2018). In connection with the amendment and restatement of the credit agreement, unamortized loan fees under the previous credit agreement of approximately $462,500 were charged to interest expense.

-5	At September 30, 2013, the Operating Partnership had additional borrowing capacity under the unsecured line of credit of up to approximately $880.0 million.
Principal Payments Due for Operating Partnership's Consolidated Indebtedness	'
	As of September 30, 2013, principal payments due for the Operating Partnership’s consolidated indebtedness (excluding debt premiums and discounts) were as follows (in thousands):



	2013	$	6,897

	2014	341,415

	2015	30,006

	2016	566,516

	2017	435,520

	Thereafter (1)	1,179,819

		$	2,560,173

	____________


	-1	Includes $180.0 million in principal payments of the Exchangeable Senior Notes based on a contractual maturity date of January 15, 2030.

Earnings_Per_Share_of_the_Pare1

Earnings Per Share of the Parent Company (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share, Basic and Diluted [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted	'
	Computations of basic and diluted earnings per share (in thousands, except share data) were as follows:



		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Basic earnings per share:
	Income from continuing operations	$	4,136		$	6,455		$	36,633		$	7,871

	Loss / (income) from continuing operations attributable to noncontrolling interests	111			(46		)	(268		)	74

	Preferred stock dividends	—			(3,651		)	(2,393		)	(10,952		)

	Cost on redemption of preferred stock	—			—			(6,531		)	—

	Net income allocable and distributions in excess of earnings to participating securities (continuing operations)	(333		)	(322		)	(989		)	(940		)
	Income / (loss) from continuing operations available to common stockholders - basic	3,914			2,436			26,452			(3,947		)


	Loss from discontinued operations	—			—			—			(4,370		)

	Loss from discontinued operations attributable to noncontrolling interests	—			—			—			82

	Loss from discontinued operations available to common stockholders - basic	—			—			—			(4,288		)


	Net income / (loss) available to common stockholders - basic	$	3,914		$	2,436		$	26,452		$	(8,235	)


	Diluted earnings per share:
	Income / (loss) from continuing operations available to common stockholders - basic	3,914			2,436			26,452			(3,947		)

	Income from continuing operations attributable to noncontrolling interests in Operating Partnership	118			53			534			—

	Income / (loss) from continuing operations available to common stockholders - diluted	4,032			2,489			26,986			(3,947		)


	Loss from discontinued operations available to common stockholders - basic and diluted	—			—			—			(4,288		)


	Net income / (loss) available to common stockholders - diluted	$	4,032		$	2,489		$	26,986		$	(8,235	)


	Weighted-average common shares outstanding:
	Basic	190,646,722			152,785,451			179,138,169			152,739,130

	Incremental shares from assumed conversion:
	Performance units	68,947			—			71,699			—

	Operating partnership and LTIP units	5,415,974			2,942,758			3,911,372			—

	Diluted	196,131,643			155,728,209			183,121,240			152,739,130


	Basic and diluted earnings per share:
	Income / (loss) from continuing operations per share available to common stockholders - basic and diluted	$	0.02		$	0.02		$	0.15		$	(0.02	)

	Loss from discontinued operations per share available to common stockholders - basic and diluted	$	—		$	—		$	—		$	(0.03	)

	Net income / (loss) per share available to common stockholders - basic and diluted	$	0.02		$	0.02		$	0.15		$	(0.05	)

Earnings_Per_Unit_of_the_Opera1

Earnings Per Unit of the Operating Partnership (Tables)	9 Months Ended
	Sep. 30, 2013
Partnership Income [Abstract]	'
Computations of Basic and Diluted Earnings Per Unit	'
	Computations of basic and diluted earnings per unit (in thousands, except unit data) were as follows:



		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Basic and diluted earnings per unit:
	Income from continuing operations	$	4,136		$	6,455		$	36,633		$	7,871

	Loss from continuing operations attributable to noncontrolling interests	229			7			266			16

	Preferred unit distributions	—			(3,651		)	(2,393		)	(10,952		)

	Cost on redemption of preferred units	—			—			(6,531		)	—

	Net income allocable and distributions in excess of earnings to participating securities (continuing operations)	(333		)	(328		)	(993		)	(959		)
	Income / (loss) from continuing operations available to unitholders - basic and diluted	4,032			2,483			26,982			(4,024		)


	Loss from discontinued operations - basic and diluted	—			—			—			(4,370		)


	Net income / (loss) available to unitholders - basic and diluted	$	4,032		$	2,483		$	26,982		$	(8,394	)


	Weighted-average units outstanding:
	Basic	196,062,696			155,699,816			183,048,587			155,661,231

	Incremental units from assumed conversion:
	Performance units	68,947			—			71,699			—

	Diluted	196,131,643			155,699,816			183,120,286			155,661,231


	Basic and diluted earnings per unit:
	Income / (loss) from continuing operations per unit available to unitholders - basic and diluted	$	0.02		$	0.02		$	0.15		$	(0.02	)

	Loss from discontinued operations per share available to unitholders - basic and diluted	$	—		$	—		$	—		$	(0.03	)

	Net income / (loss) per unit available to unitholders, basic and diluted	$	0.02		$	0.02		$	0.15		$	(0.05	)

Investment_in_Unconsolidated_P1

Investment in Unconsolidated Partnerships (Tables)	9 Months Ended
Investment in Unconsolidated Partnerships (Tables)	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Summary of Unconsolidated Partnerships	'
	The accompanying consolidated financial statements include investments in two limited liability companies with Prudential Real Estate Investors (“PREI”), 10165 McKellar Court, L.P. (“McKellar Court”), a limited partnership with Quidel Corporation, the tenant which occupies the McKellar Court property and BioPark Fremont, LLC ("BioPark Fremont"), a limited liability company with RPC Poppleton, LLC. General information on the PREI limited liability companies, the McKellar Court partnership, and BioPark Fremont (each referred to in this footnote individually as a “partnership” and collectively as the “partnerships”) as of September 30, 2013 was as follows:


	Name	Partner		Company’s	Company’s		Date Acquired
				Ownership	Economic
				Interest	Interest
	PREI I LLC (1)	PREI		20%	20%		April 4, 2007
	PREI II LLC	PREI		20%	20%		April 4, 2007
	McKellar Court (2)	Quidel Corporation		22%	22%		September 30, 2004
	BioPark Fremont (3)	RPC Poppleton, LLC		50%	50%		May 31, 2013
	____________


	-1	PREI I LLC owns two properties in Cambridge, Massachusetts. At September 30, 2013, there were $139.0 million in outstanding borrowings on a secured loan facility held by a wholly-owned subsidiary of PREI I LLC, with a contractual interest rate of 3.19% (including the applicable credit spread) and a maturity date of August 13, 2014.

	-2	The Company’s investment in the McKellar Court partnership (maximum exposure to losses) was approximately $12.1 million at September 30, 2013. The Company’s economic interest in the McKellar Court partnership entitles it to 75% of the extraordinary cash flows after repayment of the partners’ capital contributions and 22% of the operating cash flows.


	-3	The Company's partnership interest was acquired in connection with the Company's merger with Wexford.
Summary of Selected Balance Sheet Information	'
	The condensed combined balance sheets for all of the Company’s unconsolidated partnerships were as follows (in thousands):



		September 30,			December 31,
		2013			2012
	Assets:
	Investments in real estate, net	$	260,411		$	257,666
	Investments in real estate, net	$	260,411		$	257,666
	Cash and cash equivalents (including restricted cash)	2,761			1,968
	Cash and cash equivalents (including restricted cash)	2,761			1,968
	Other assets	6,097			4,370
	Other assets	6,097			4,370
	Total assets	$	269,269		$	264,004
	Total assets	$	269,269		$	264,004
	Liabilities and members’ equity:
	Mortgage notes payable and secured loan	$	151,954		$	149,255
	Mortgage notes payable and secured loan	$	151,954		$	149,255
	Other liabilities	10,708			5,988
	Other liabilities	10,708			5,988
	Members’ equity	106,607			108,761
	Members’ equity	106,607			108,761
	Total liabilities and members equity	$	269,269		$	264,004
	Total liabilities and members equity	$	269,269		$	264,004
	Company’s net investment in unconsolidated partnerships	$	31,978		$	32,367
	Company’s net investment in unconsolidated partnerships	$	31,978		$	32,367
Schedule of Selected Income Statement Information	'
	The selected data and results of operations for the unconsolidated partnerships were as follows (in thousands):


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Total revenues	$	3,778		$	2,195		$	9,486		$	6,582
	Total revenues	$	3,778		$	2,195		$	9,486		$	6,582
	Total expenses	(5,328		)	(4,975		)	(16,013		)	(14,756		)
	Net loss	(1,550		)	(2,780		)	(6,527		)	(8,174		)

	Company’s equity in net loss of unconsolidated partnerships	$	(112	)	$	(339	)	$	(697	)	$	(1,011	)

	Fees earned by the Company (1)	$	35		$	22		$	121		$	67
	Fees earned by the Company (1)	$	35		$	22		$	121		$	67
	____________


	-1	The Company acts as the operating member or partner, as applicable, and day-to-day manager for the partnerships. The Company is entitled to receive fees for providing construction and development services (as applicable) and management services to the PREI joint ventures, which are reflected in tenant recoveries and other income in the consolidated statements of operations.

Derivatives_and_Other_Financia1

Derivatives and Other Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Summary of Derivative Instruments	'
	The following is a summary of the terms of the interest rate swaps and their respective fair-values (dollars in thousands):



											Fair-Value(1)
		Notional Amount									September 30,				December 31,
					Strike Rate			Effective Date		Expiration Date	2013				2012
	Interest rate swaps	$	200,000		1.163	%		March 30, 2012		March 30, 2017	$	(2,291	)		$	(4,826	)

	Interest rate swaps	200,000			0.701	%		October 1, 2013		October 1, 2016	(330		)		—

	Interest rate swaps(2)	80,815			0.731	%		August 2, 2012		March 30, 2017	890				(216		)

	Interest rate swaps(2)	80,815			0.7425	%		August 2, 2012		March 30, 2017	866				(243		)

	Total interest rate swaps	$	561,630								$	(865	)		$	(5,285	)

	____________


	-1	Fair-value of derivative instruments does not include any related accrued interest payable, which is included in accrued expenses on the accompanying consolidated balance sheets. Derivative valuations are classified in Level 2 of the fair-value hierarchy. Assets are included in other assets and liabilities are included in accounts payable, accrued expenses and other liabilities on the accompanying consolidated balance sheets.

	-2	Translation to U.S. dollars is based on an exchange rate of $1.62 to £1.00 at both September 30, 2013 and December 31, 2012.
Summary of Derivative Instruments, Effect on OCI	'
	The following is a summary of the amount of (loss) / gain recognized in other comprehensive income related to the derivative instruments (in thousands):



		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2013			2012				2013			2012
	Amount of (loss) / gain recognized in other comprehensive income (effective portion):
	Cash flow hedges
	Interest rate swaps	$	(1,371	)	$	(2,523	)		$	2,653		$	(6,701	)


	Amount of loss reclassified from accumulated other comprehensive loss to income (effective portion):
	Cash flow hedges
	Interest rate swaps (1)	$	600		$	522			$	1,752		$	999

	Forward starting swaps (2)	1,705			1,730				5,134			5,209

	Total interest rate swaps	$	2,305		$	2,252			$	6,886		$	6,208

	____________


	-1	Amount represents payments made to swap counterparties for the effective portion of interest rate swaps that were recognized as an increase to interest expense for the periods presented (the amount was recorded as an increase and corresponding decrease to accumulated other comprehensive loss in the same accounting period).

	-2	Amount represents reclassifications of deferred interest costs from accumulated other comprehensive loss to interest expense related to the Company’s previously settled forward starting swaps.

FairValue_of_Financial_Instrum1

Fair-Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair-Value and Carrying Value of the Company's Financial Instruments	'
	At September 30, 2013 and December 31, 2012, the aggregate fair-value and the carrying value of the Company’s financial instruments were as follows (in thousands):



		September 30, 2013				December 31, 2012
		Fair-Value (1)		Carrying Value		Fair-Value (1)		Carrying Value
	Mortgage notes payable, net	$	738,873	$	716,733	$	605,948	$	571,652

	Exchangeable Senior Notes	205,434		180,000		209,484		180,000

	Notes due 2016, net	418,640		398,659		421,400		398,289

	Notes due 2020, net	276,625		248,151		292,725		247,984

	Notes due 2022, net	242,125		248,040		261,750		247,904

	Term Loan due 2017 - U.S. dollar	244,837		243,596		243,596		243,596

	Term Loan due 2017 - GBP (2)	162,449		161,630		161,860		161,860

	Term Loan due 2018	350,000		350,000		—		—

	Unsecured line of credit	20,000		20,000		118,000		118,000

	Derivative instruments (3)	865		865		5,285		5,285

	Available-for-sale securities	17,391		17,391		390		390

	____________


	-1	Fair-values of debt and derivative instruments are classified in Level 2 of the fair-value hierarchy. Fair-value of available-for-sale securities are classified in Level 1 of the fair-value hierarchy.

	-2	The principal balance represents the U.S. dollar amount based on the exchange rate of $1.62 to £1.00 at both September 30, 2013 and December 31, 2012.

	-3	The Company’s derivative instruments are reflected in other assets and in accounts payable, accrued expenses and other liabilities on the accompanying consolidated balance sheets based on their respective balances (see Note 9).

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
Acquisitions (Tables)	Sep. 30, 2013
Business Acquisition	'
Schedule of Purchase Price Allocation - excluding Merger	'
	The Company acquired the following properties during the nine months ended September 30, 2013. The table below reflects the purchase price allocation for these acquisitions and excludes the merger with Wexford, which is discussed below (in thousands):



	Property		Acquisition Date	Investments in Real Estate				In-Place Lease			Management				Below Market Lease			Acquisition Date Fair- Value
	Property		Acquisition Date	Investments in Real Estate				In-Place Lease			Agreement				Below Market Lease			Acquisition Date Fair- Value
	Woodside Technology Park		February 28, 2013	$	78,681			$	8,162		$	865			$	(708	)	$	87,000
	Woodside Technology Park		February 28, 2013	$	78,681			$	8,162		$	865			$	(708	)	$	87,000
	The Campus at Lincoln Centre		March 20, 2013	37,000				—			—				—			37,000
	The Campus at Lincoln Centre		March 20, 2013	37,000				—			—				—			37,000
	320 Charles Street		June 18, 2013	47,018				4,578			—				(2,078		)	49,518
	320 Charles Street		June 18, 2013	47,018				4,578			—				(2,078		)	49,518
	Total			$	162,699			$	12,740		$	865			$	(2,786	)	$	173,518
	Total			$	162,699			$	12,740		$	865			$	(2,786	)	$	173,518
	Weighted average intangible amortization life (in months)							61			108				18
	Weighted average intangible amortization life (in months)							61			108				18
Schedule of Purchase Price Allocation - Merger	'
	On May 31, 2013, the Company completed a merger with Wexford. The preliminary purchase price allocations of the fair-value of assets acquired, liabilities assumed and consideration paid in the Wexford merger are presented below (in thousands). The Company expects the purchase price allocations to be finalized within one year of the acquisition date.


		At Acquisition
	Assets:
	Investments in real estate	$	663,969
	Investments in real estate	$	663,969
	Cash and cash equivalents	5,182
	Cash and cash equivalents	5,182
	Accounts receivable, net	937
	Accounts receivable, net	937
	Deferred leasing costs (1)	50,555
	Deferred leasing costs (1)	50,555
	Other assets (2)	82,825
	Other assets (2)	82,825
	Total assets	$	803,468
	Total assets	$	803,468
	Liabilities:
	Mortgage notes payable (3)	254,735
	Mortgage notes payable (3)	254,735
	Other liabilities (4)	64,201
	Other liabilities (4)	64,201
	Total liabilities	$	318,936
	Total liabilities	$	318,936

	Fair value of net assets acquired	$	484,532
	Fair value of net assets acquired	$	484,532

	Cash consideration paid for Wexford	$	345,268
	Cash consideration paid for Wexford	$	345,268
	Equity consideration paid for Wexford (5)	123,596
	Equity consideration paid for Wexford (5)	123,596
	Contingent consideration in merger with Wexford (6)	15,668
	Contingent consideration in merger with Wexford (6)	15,668
	Total consideration for Wexford	$	484,532
	Total consideration for Wexford	$	484,532
	____________


	-1	$50.6 million of acquired in-place leases with a weighted-average lease term of approximately 10.3 years are included in deferred leasing costs.

	-2	$9.6 million of acquired above-market leases with a weighted-average lease term of approximately 11.6 years and $8.5 million of acquired below-market ground leases with a weighted-average lease term of approximately 45.0 years are included in other assets.

	-3	$8.7 million of debt premiums with a weighted-average term of approximately 9.2 years are included in mortgage notes payable, net.

	-4	$31.4 million of acquired below-market leases with a weighted-average lease term of approximately 13.4 years and $1.4 million of acquired above-market ground leases with a weighted-average lease term of approximately 64.8 years are included in other liabilities.

	-5	Consists of 5,568,227 shares of the Parent Company's common stock and 336,960 operating partnership units.

	-6	Includes potential additional consideration to be paid to the seller upon the achievement of certain pipeline development milestones.
Selected Financial Data of the VIEs	'
	Selected financial data of the VIEs at September 30, 2013 and December 31, 2012 consist of the following (in thousands):


		September 30,			December 31,
		2013			2012
	Investment in real estate, net	$	332,004		$	334,331
	Investment in real estate, net	$	332,004		$	334,331
	Total assets	371,341			369,460
	Total assets	371,341			369,460
	Total debt	143,538			144,889
	Total debt	143,538			144,889
	Total liabilities	152,051			149,336
	Total liabilities	152,051			149,336
	The Company has determined that certain special purpose entities owning properties under development are VIEs, since there is insufficient capital to finance the remaining development activities without further subordinated financial support. The Company has determined it is the primary beneficiary of these VIEs, because it has the authority to direct the activities which most significantly impact their economic performance. Selected financial data of the VIEs at September 30, 2013 consisted of the following (in thousands):



		September 30,
		2013
	Investment in real estate, net	$	148,660
	Investment in real estate, net	$	148,660
	Total assets	148,662
	Total assets	148,662
	Total liabilities	64,314
	Total liabilities	64,314
Parent Company	'
Business Acquisition	'
Pro Forma Results	'
	The unaudited pro forma revenues and operating income of the Parent Company, including the acquisitions that occurred in 2013 as if they had taken place on January 1, 2012, are as follows (in thousands, except per share amounts):



		For the Three Months Ended							For the Nine Months Ended
		September 30,							September 30,
		2013			2012				2013			2012
		2013			2012				2013			2012
	Total revenues	$	159,232		$	152,599			$	508,911		$	433,581
	Total revenues	$	159,232		$	152,599			$	508,911		$	433,581
	Net income / (loss) available to common stockholders	4,247			(2,362		)		26,702			(20,763		)
	Net income / (loss) available to common stockholders	4,247			(2,362		)		26,702			(20,763		)
	Net income / (loss) per share available to common stockholders - basic and diluted	$	0.02		$	(0.02	)		$	0.15		$	(0.14	)
		$	0.02		$	(0.02	)		$	0.15		$	(0.14	)
BIOMED REALTY, L.P.	'
Business Acquisition	'
Pro Forma Results	'
	The unaudited pro forma revenues and operating income of the Operating Partnership, including the acquisitions that occurred in 2013 as if they had taken place on January 1, 2012, are as follows (in thousands, except per unit amounts):



		For the Three Months Ended							For the Nine Months Ended
		September 30,							September 30,
		2013			2012				2013			2012
		2013			2012				2013			2012
	Total revenues	$	159,232		$	152,599			$	508,911		$	433,581
	Total revenues	$	159,232		$	152,599			$	508,911		$	433,581
	Net income / (loss) available to unitholders	4,365			(2,309		)		27,236			(20,903		)
	Net income / (loss) available to unitholders	4,365			(2,309		)		27,236			(20,903		)
	Net income / (loss) per share available to unitholders - basic and diluted	$	0.02		$	(0.02	)		$	0.15		$	(0.14	)
		$	0.02		$	(0.02	)		$	0.15		$	(0.14	)

Discontinued_Operations_Tables

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2012

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

The table below reflects the details of the property and the exchange (in thousands):

Property

Date of Sale

Original Acquisition Date

Sales Price (1)

Impairment loss

Forbes Boulevard

April 27, 2012

September 5, 2007

28,000

(4,552

)

_________

-1

The sales price was equal to the fair-value of the office property received as consideration in the exchange with the independent third party.

Organization_of_the_Parent_Com1

Organization of the Parent Company and Description of Business (Details)	Sep. 30, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements	'	'
Equity Method Investment, Ownership Percentage	100.00%	100.00%
Remaining Ownership Interest Held by Limited Partners	2.70%	'
Parent Company	'	'
Organization, Consolidation and Presentation of Financial Statements	'	'
Equity Method Investment, Ownership Percentage	97.30%	98.10%

Basis_of_Presentation_and_Summ3

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012		Dec. 31, 2012
Basis of Presentation and Summary of Significant Accounting Policies	'	'	'	'		'
Revenue from properties outside the United States, net	$18,700,000	'	$27,000,000	'		'
Real Estate Investment Property, Net	5,172,102,000	'	5,172,102,000	'		4,319,716,000
Number of Variable Interest Entities that the Company is the Primary Beneficiary	'	'	5	'		'
Fair Value	'	'	'	28,000,000	[1]	'
Impairment of Long-Lived Assets to be Disposed of	'	'	'	4,600,000		'
Reclassification Of Other Than Temporary Unrealized Loss From Accumulated Other Comprehensive Income To General And Administrative Expense	'	'	-2,800,000	'		'
Cost-method Investments, Other than Temporary Impairment	'	'	2,000,000	'		'
Other Asset Impairment Charges	'	'	-825,000	'		'
Receivable with Imputed Interest, Due Date	'	'	30-Sep-14	'		'
Number of extension options	'	'	2	'		'
Extension options	'	'	'1 year	'		'
Debt Instrument, Basis Spread on Variable Rate	'	'	550.00%	'		'
Debt Instrument, Interest Rate, Stated Percentage	6.50%	'	6.50%	'		'
Investment In Construction Loan	'	'	120,900,000	'		'
Lease Termination Revenue	1,500,000	'	'	'		'
Foreign	'	'	'	'		'
Basis of Presentation and Summary of Significant Accounting Policies	'	'	'	'		'
Revenue from properties outside the United States, net	4,500,000	4,400,000	13,500,000	5,300,000		'
Percentage of Company's total revenue	2.80%	3.30%	2.80%	1.40%		'
Real Estate Investment Property, Net	190,500,000	'	190,500,000	'		188,800,000
Boston Development Project	'	'	'	'		'
Basis of Presentation and Summary of Significant Accounting Policies	'	'	'	'		'
BioMed Realty Trust Interest in Construction Loan	'	'	255,000,000	'		'
Construction Loan	'	'	355,000,000	'		'
Square Footage of Real Estate Property	1,100,000	'	1,100,000	'		'
Percent Leased	95.00%	'	95.00%	'		'
Science Center at Oyster Point	'	'	'	'		'
Basis of Presentation and Summary of Significant Accounting Policies	'	'	'	'		'
Lease Termination Revenue	'	'	46,500,000	'		'
320 Bent Street	'	'	'	'		'
Basis of Presentation and Summary of Significant Accounting Policies	'	'	'	'		'
Lease Termination Revenue	'	'	$8,700,000	'		'

[1]	The sales price was equal to the fair-value of the office property received as consideration in the exchange with the independent third party.

Basis_of_Presentation_and_Summ4

Basis of Presentation and Summary of Significant Accounting Policies (Selected Financial Data of the VIEs) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounting Policies [Abstract]	'	'
Investment in Real Estate, Net	$332,004	$334,331
Total Assets	371,341	369,460
Total Debt	143,538	144,889
Total Liabilities	$152,051	$149,336

Basis_of_Presentation_and_Summ5

Basis of Presentation and Summary of Significant Accounting Policies (Investments in Real Estate, Net) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounting Policies [Abstract]	'	'
Land	$692,633	$702,993
Land Under Development	133,372	48,744
Buildings and Improvements	4,771,874	4,028,089
Construction in Progress	311,296	143,340
Real Estate Investment Property, at Cost	5,909,175	4,923,166
Accumulated Depreciation	-737,073	-603,450
Real Estate Investment Property, Net	$5,172,102	$4,319,716

Basis_of_Presentation_and_Summ6

Basis of Presentation and Summary of Significant Accounting Policies (Deferred Leasing Costs, Net) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Leasing Costs	'	'
Finite-Lived Intangible Assets, Gross	$476,739	$396,659
Finite-Lived Intangible Assets, Accumulated Amortization	-274,346	-224,296
Finite-Lived Intangible Assets, Net	202,393	172,363
Leases, Acquired-in-Place	'	'
Deferred Leasing Costs	'	'
Finite-Lived Intangible Assets, Gross	368,733	303,521
Finite-Lived Intangible Assets, Accumulated Amortization	-225,811	-185,463
Finite-Lived Intangible Assets, Net	142,922	118,058
Acquired Management Agreements	'	'
Deferred Leasing Costs	'	'
Finite-Lived Intangible Assets, Gross	25,801	24,963
Finite-Lived Intangible Assets, Accumulated Amortization	-19,677	-15,242
Finite-Lived Intangible Assets, Net	6,124	9,721
Deferred Leasing and Other Direct Costs	'	'
Deferred Leasing Costs	'	'
Finite-Lived Intangible Assets, Gross	82,205	68,175
Finite-Lived Intangible Assets, Accumulated Amortization	-28,858	-23,591
Finite-Lived Intangible Assets, Net	$53,347	$44,584

Basis_of_Presentation_and_Summ7

Basis of Presentation and Summary of Significant Accounting Policies (Investments) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Accounting Policies [Abstract]	'		'
Available-for-sale securities, historical cost	$8,840		$275
Unrealized gain, net	8,551		115
Available-for-sale securities, fair-value	17,391	[1]	390	[1]
Privately-held securities, cost basis	13,130		12,280
Total equity securities	$30,521		$12,670

[1]	Determination of fair-value is classified as Level 1 in the fair-value hierarchy based on the use of quoted prices in active markets.

Equity_of_the_Parent_Company_N

Equity of the Parent Company (Narrative) (Details) (USD $)

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Mar. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Common Stock

Parent Company

Wexford

BIOMED REALTY, L.P.

Preferred Stock Repurchased

Performance Shares

Limited Partner

Common Stock

Series A Preferred Stock

Operating Partnership Units and LTIP Units

Restricted Stock Issued to Employees

Restricted Stock Issued to Board Members

Common Stock

Series A Preferred Stock

Parent Company

Common Stock

BIOMED REALTY, L.P.

Common Stock

Equity of the Parent Company

Restricted Stock Awards Issued

620,590

26,897

Shares surrendered to the Company and retired in lieu of cash payments for taxes due on the vesting of restricted stock

253,289

Shares forfeited during the period

38,821

Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures

335,308

20,069

132,441

Stock Issued During Period, Shares, New Issues

17,250,000

14,605,000

31,855,000

41,568

2,034,211

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value

$3,600,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value

2,500,000

3,300,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term

'1 year 9 months 10 days

'3 years 8 months 12 days

Performance units forfeited during the period

136,296

Performance units

406,288

Stock Issued During Period, Value, New Issues

287,000,000

641,130,000

319,000

682,648,000

41,518,000

Stock Redeemed or Called During Period, Shares

7,920,000

Proceeds from Issuance of Common Stock

354,100,000

668,553,000

Stock Issued During Period, Merger Issues

5,568,227

Stock Issued During Period, Units, Issued in Connection with Wexford Merger

336,960

Common Stock, Shares Outstanding

192,106,749

154,327,818

Partnership Units, Shares Outstanding

5,083,400

7,920,000

5,415,974

2,932,758

LTIP Units, Shares Outstanding

332,574

Redemption Of Series Preferred Stock

-198,000,000

-191,469,000

-198,000,000

198,000,000

Payments for Repurchase of Redeemable Preferred Stock

Payments of Ordinary Dividends, Preferred Stock and Preference Stock

6,045,000

10,950,000

6,045,000

10,950,000

2,400,000

Preferred Stock, Dividend Rate, Per-Dollar-Amount

$0.30

Cost on redemption of preferred stock / units

-6,531,000

6,500,000

Noncontrolling Interest Redemption Value

$103,200,000

Average Closing Price Per Common Share

$19.05

Noncontrolling Interest Redemption Value Calculation Days

'10 days

Equity_of_the_Parent_Company_D

Equity of the Parent Company (Dividends and Distributions) (Details) (USD $)	9 Months Ended	3 Months Ended			9 Months Ended						3 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2013		Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Mar. 31, 2013
		Common stock and OP units	Common stock and OP units	Common stock and OP units	Common stock and OP units	Series A Preferred Stock		Parent Company	Parent Company	Parent Company	Parent Company
										Series A Preferred Stock	Preferred Stock Repurchased
Equity of the Parent Company	'	'	'	'	'	'		'	'	'	'
Declaration Date	'	16-Sep-13	14-Jun-13	15-Mar-13	'	'		'	'	'	'
Amount Per Common Share/Unit	'	$0.24	$0.24	$0.24	'	'		'	'	'	'
Dividend and Distribution Payable Date	'	15-Oct-13	15-Jul-13	15-Apr-13	'	'		'	'	'	'
Dividend and Distribution Amount	$135,605,000	$46,418,000	$46,381,000	$40,413,000	$133,212,000	$2,393,000	[1]	'	'	'	'
Stock Redeemed or Called During Period, Shares	'	'	'	'	'	'		'	'	'	7,920,000
Redemption Of Series Preferred Stock	'	'	'	'	'	'		-198,000,000	'	-191,469,000	198,000,000
Payments for Repurchase of Redeemable Preferred Stock	'	'	'	'	'	'		'	'	'	25
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	'	'	'	'	'	'		$6,045,000	$10,950,000	'	$2,400,000
Preferred Stock, Dividend Rate, Per-Dollar-Amount	'	'	'	'	'	'		'	'	'	$0.30

[1]	On MarchB 15, 2013, the Company redeemed all 7,920,000 outstanding shares of its Series A preferred stock for approximately $198.0 million, or $25.00 per share, net of accrued dividends of approximately $2.4 million, or $0.30217 per share.

Equity_of_the_Parent_Company_E

Equity of the Parent Company Equity of the Parent Company (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (Parent Company, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]	'	'	'		'	'
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$3,276	'	$3,276		'	$3,543
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	7,189	'	7,189		'	114
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	-49,083	'	-49,083		'	-58,382
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,016,059	'	3,016,059		'	2,484,541
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	'	'	-252		'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	'	'	8,435		'	'
Other Comprehensive Income (Loss), before Tax	'	'	10,836		'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	'	'	6,886	[1]	'	'
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	'	'	6,886	[1]	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,866	576	-252		3,567	'
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	2,280	10	8,435		-509	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	'	'	9,539		'	'
Other Comprehensive Income (Loss), Net of Tax	5,080	344	17,722		3,211	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	'	'	-15		'	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	'	'	-1,360		'	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest	'	'	-240		'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	'	'	-1,615		'	'
Interest Rate Swaps	'	'	'		'	'
Accumulated Other Comprehensive Income Loss [Line Items]	'	'	'		'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	-1,371	-2,523	2,653		-6,701	'
Accumulated Other Comprehensive Income (Loss)	'	'	'		'	'
Accumulated Other Comprehensive Income Loss [Line Items]	'	'	'		'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	-38,618	'	-38,618		'	-54,725
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	'	'	7,075		'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	'	'	5,013		'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	($267)		'	'

[1]	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Equity_of_the_Parent_Company_V

Equity of the Parent Company (Vested Ownership Interests) (Details)	Sep. 30, 2013	Dec. 31, 2012
Equity of the Parent Company	'	'
Operating Partnership Units and LTIP Units	195,960,343	155,757,733
Equity Method Investment, Ownership Percentage	100.00%	100.00%
Parent Company	'	'
Equity of the Parent Company	'	'
Operating Partnership Units and LTIP Units	190,676,810	152,853,368
Equity Method Investment, Ownership Percentage	97.30%	98.10%
Operating Partnership and LTIP Units Held By Employees and Related Parties	'	'
Equity of the Parent Company	'	'
Operating Partnership Units and LTIP Units	2,656,388	2,339,314
Equity Method Investment, Ownership Percentage	1.40%	1.50%
Operating Partnership and LTIP Units Held By Third Parties	'	'
Equity of the Parent Company	'	'
Operating Partnership Units and LTIP Units	2,627,145	565,051
Equity Method Investment, Ownership Percentage	1.30%	0.40%

Capital_of_the_Operating_Partn2

Capital of the Operating Partnership (Narrative) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	BIOMED REALTY, L.P.	Parent Company	Parent Company	Parent Company
Capital of the Operating Partnership [Line Items]	'	'	'	'	'	'
Partners' Capital Account, Units	'	'	197,190,149	'	'	'
LTIP Units, Shares Outstanding	'	'	332,574	'	'	'
Equity Method Investment, Ownership Percentage	100.00%	100.00%	'	'	97.30%	98.10%
Noncontrolling Interest Redemption Value	'	'	'	$103.20	'	'
Average Closing Price Per Common Share	'	'	'	$19.05	'	'
Noncontrolling Interest Redemption Value Calculation Days	'	'	'	'10 days	'	'

Capital_of_the_Operating_Partn3

Capital of the Operating Partnership Capital of the Operating Partnership (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (BIOMED REALTY, L.P., USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Capital of the Operating Partnership [Line Items]	'	'	'		'	'
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$3,359	'	$3,359		'	$3,611
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	8,550	'	8,550		'	115
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	-47,264	'	-47,264		'	-56,803
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,016,059	'	3,016,059		'	2,484,541
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	'	'	-252		'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	'	'	8,435		'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	'	'	2,653		'	'
Other Comprehensive Income (Loss), before Tax	'	'	10,836		'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	'	'	6,886	[1]	'	'
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	'	'	6,886	[1]	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,866	576	-252		3,567	'
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	2,280	10	8,435		-509	'
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	'	'	9,539		'	'
Other Comprehensive Income (Loss), Net of Tax	5,080	344	17,722		3,211	'
Accumulated Other Comprehensive Income (Loss)	'	'	'		'	'
Capital of the Operating Partnership [Line Items]	'	'	'		'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	-35,355	'	-35,355		'	-53,077
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	'	'	8,435		'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	'	'	5,134		'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	'	'	($252)		'	'

[1]	Amounts reclassified from loss on derivative instruments are included in interest expense, net in the consolidated statements of operations. See Note 9 for further information.

Debt_Debt_Narrative_Details

Debt Debt (Narrative) (Details) (USD $)

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

Sep. 30, 2013

Sep. 26, 2013

Sep. 30, 2013

Sep. 30, 2011

Sep. 30, 2013

Mar. 31, 2012

Sep. 30, 2013

Interest Rate Swaps

Exchangeable Senior Notes

Unsecured Line of Credit and Term Loan

Unsecured Line of Credit

Unsecured Term Loans

Unsecured Term Loan GBP Portion [Member]

Interest Rate Swaps - $200M (2)

London Interbank Offered Rate (LIBOR)

Prime Rate

Federal Funds Rate

Projects Excluding CFLS

CFLS

London Interbank Offered Rate (LIBOR)

Minimum

Maximum

London Interbank Offered Rate (LIBOR)

Unsecured Term Loans

number_of_years

One-Month LIBOR

Maximum

Minimum

Maximum

Reserve-Adjusted LIBOR

Rate

Reserve-Adjusted LIBOR

Rate

Minimum

Maximum

Rate

Minimum

Maximum

Minimum

Maximum

Rate

Debt Instruments

Increment of Dividends per Common Share Increase Exchange Rate

$0.14

Debt Instrument, Convertible, Conversion Ratio

57.8068

Debt Conversion, Original Debt, Amount

$1,000

Debt Instrument, Convertible, Conversion Price

$17.30

Dividends Payable Date of Ex-Dividend

26-Sep-13

Debt Instrument, Issuance Date

24-Sep-13

14-Jul-11

30-Mar-12

Debt Instrument, Face Amount

1,250,000,000

900,000,000

350,000,000

Debt Instrument, Maturity Date

15-Jan-30

24-Mar-18

[1],[2]

30-Mar-17

[3]

Debt Instrument, Maximum Borrowing Capacity

1,800,000,000

Debt Instrument, Maturity Date Range, End

24-Sep-18

Debt Instrument, Basis Spread on Variable Rate

550.00%

92.50%

170.00%

70.00%

50.00%

120.00%

92.50%

170.00%

95.00%

195.00%

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

12.50%

30.00%

Fair Value Inputs, Cap Rate

7.25%

6.25%

Derivative, Inception Date

25-Sep-13

1-Oct-13

Derivative, Notional Amount

$561,630,000

$200,000,000

Derivative, Fixed Interest Rate

2.20%

Derivative, Number Of Years

[1]

In September 2013, the Operating Partnership amended and restated its unsecured credit agreement, providing for aggregate borrowing of up to $1.25 billion, consisting of an unsecured line of credit of $900.0 million and a term loan of $350.0 million (the Term Loan due 2018). In connection with the amendment and restatement of the credit agreement, unamortized loan fees under the previous credit agreement of approximately $462,500 were charged to interest expense.

[2]

At SeptemberB 30, 2013, the Operating Partnership had additional borrowing capacity under the unsecured line of credit of up to approximately $880.0 million.

[3]

In August 2012, the Operating Partnership converted approximately $156.4 million of outstanding borrowings into British pounds sterling (bGBPb) equal to £100.0 million, which was designated as a net investment hedge to mitigate the risk of fluctuations in foreign currency exchange rates. The principal balance represents the U.S. dollar amount based on the exchange rate of $1.62 to £1.00 at both SeptemberB 30, 2013 and DecemberB 31, 2012. The effective interest rate includes the impact of interest rate swap agreements (see Note 9 for further discussion of interest rate swap agreements).

Debt_Summary_of_the_Operating_

Debt (Summary of the Operating Partnership's Outstanding Consolidated Debt) (Details)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Mar. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2011

Dec. 31, 2012

Sep. 30, 2013

USD ($)

Unsecured Term Loan Due 2017 GBP Portion

Mortgage Notes Payable

Exchangeable Senior Notes

Unsecured Senior Notes

Unsecured Term Loans

Unsecured Line of Credit

Unsecured Line of Credit and Term Loan

USD ($)

9900 Belward Campus Drive

9901 Belward Campus Drive

Center for Life Science Boston

4320 Forest Park Avenue

Heritage @ 4240

Hershey Center for Applied Research

500 Kendall Street (Kendall D)

Shady Grove Road

University of Maryland BioPark I

University of Maryland BioPark II

University of Maryland BioPark Garage

University of Miami Life Science & Technology Park

USD ($)

Unsecured Senior Notes Due 2016

Unsecured Senior Notes Due 2020

Unsecured Senior Notes Due 2022

USD ($)

Unsecured Term Loan Due 2017 USD Portion

Unsecured Term Loan Due 2017 GBP Portion

Unsecured Term Loan Due 2018

USD ($)

USD

GBP

USD ($)

GBP (£)

Debt Instruments

Stated Interest Rate

6.50%

5.64%

7.75%

4.00%

[1]

3.18%

[2]

6.15%

[1]

6.38%

5.97%

5.93%

[1]

5.20%

[1]

5.20%

[1]

4.00%

[1]

3.75%

3.85%

6.13%

4.25%

1.83%

[3]

2.14%

[3]

1.68%

[4]

1.48%

[4],[5]

Effective Interest Rate

3.99%

7.75%

2.70%

[1]

3.18%

[2]

4.71%

[1]

5.45%

5.97%

4.69%

[1]

4.33%

[1]

4.33%

[1]

2.89%

[1]

3.75%

3.99%

6.27%

4.36%

2.64%

[3]

2.39%

[3]

1.68%

[4]

1.48%

[4],[5]

Principal Balance

$2,560,173,000

$704,947,000

$567,527,000

$10,666,000

$10,767,000

$13,135,000

$13,260,000

$335,476,000

$338,447,000

$21,000,000

[1]

$4,194,000

[2]

$13,568,000

[1]

$58,500,000

$60,164,000

$143,538,000

$144,889,000

$16,915,000

[1]

$63,198,000

[1]

$4,757,000

[1]

$20,000,000

[1]

Unamortized Premiums

11,786,000

4,125,000

Mortgage Notes Payable, net

716,733,000

571,652,000

Exchangeable Senior Notes

180,000,000

Unsecured Senior Notes

900,000,000

400,000,000

250,000,000

Unamortized Discounts

-5,150,000

-5,823,000

Unsecured Senior Notes, net

894,850,000

894,177,000

Unsecured Term Loans

755,226,000

405,456,000

243,596,000

[3]

243,596,000

[3]

161,630,000

[3]

161,860,000

[3]

156,400,000

[3]

100,000,000

[3]

350,000,000

[4]

Unsecured Line of Credit

20,000,000

[4],[5]

118,000,000

[4],[5]

Total Consolidated Debt

2,566,809,000

2,169,285,000

Maturity Date

1-Jul-17

30-Jun-14

30-Jun-15

[1]

26-Dec-15

[2]

5-May-27

[1]

1-Dec-18

1-Sep-16

15-May-25

[1]

5-Sep-21

[1]

1-Sep-21

[1]

1-Feb-16

[1]

15-Jan-30

15-Apr-16

15-Apr-20

15-Jul-22

30-Mar-17

[3]

30-Mar-17

[3]

24-Mar-18

[4]

24-Mar-18

[4],[5]

24-Mar-18

Foreign Currency Exchange Rate, Translation

1.62

Debt Instrument, Issuance Date

30-Mar-12

14-Jul-11

24-Sep-13

Debt Instrument, Face Amount

350,000,000

900,000,000

1,250,000,000

Amortization of Financing Costs

462,500

LOC Remaining Borrowing Capacity

$880,000,000

[1]

Mortgage notes which were assumed on May 31, 2013 in connection with the Companybs merger with Wexford.

[2]

In October 2013, the Operating Partnership voluntarily repaid in full the outstanding mortgage note pertaining to the Heritage @ 4240 property prior to the scheduled maturity.

[3]

[4]

[5]

At SeptemberB 30, 2013, the Operating Partnership had additional borrowing capacity under the unsecured line of credit of up to approximately $880.0 million.

Debt_Principal_Payments_Due_fo

Debt (Principal Payments Due for Operating Partnership's Consolidated Indebtedness) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2013		Dec. 31, 2012
Year 1	$6,897		$6,897		'
Year 2	341,415		341,415		'
Year 3	30,006		30,006		'
Year 4	566,516		566,516		'
Year 5	435,520		435,520		'
Thereafter	1,179,819	[1]	1,179,819	[1]	'
Principal Balance	2,560,173		2,560,173		'
Exchangeable Senior Notes	'		'		'
Exchangeable Senior Notes	$180,000		$180,000		$180,000
Maturity Date	15-Jan-30		15-Jan-30		'

[1]	Includes $180.0 million in principal payments of the Exchangeable Senior Notes based on a contractual maturity date of JanuaryB 15, 2030.

Earnings_Per_Share_of_the_Pare2

Earnings Per Share of the Parent Company (Narrative) (Details) (Exchangeable Senior Notes Due 2030)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
BIOMED REALTY, L.P.	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Exchangeable Senior Notes Due 2030	10,405,224	10,127,232
Parent Company	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Exchangeable Senior Notes Due 2030	10,405,224	10,127,232

Earnings_Per_Share_of_the_Pare3

Earnings Per Share of the Parent Company (Schedule of Earnings Per Share, Basic and Diluted) (Details) (Parent Company, USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Parent Company	'	'	'	'
Schedule of Earnings Per Share Basic and Diluted	'	'	'	'
Income from continuing operations and noncontrolling interests	$4,136	$6,455	$36,633	$7,871
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest	111	-46	-268	74
Preferred Stock Dividends and Other Adjustments	'	-3,651	-2,393	-10,952
Cost On Redemption Of Preferred Stock	'	'	-6,531	'
Participating Securities, Distributed and Undistributed Earnings	-333	-322	-989	-940
Income (Loss) from Continuing Operations Attributable to Parent	3,914	2,436	26,452	-3,947
Income / (loss) from discontinued operations	'	'	'	-4,370
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest	'	'	'	82
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	'	'	'	-4,288
Net Income (Loss) Available to Common Stockholders, Basic	3,914	2,436	26,452	-8,235
Income (loss) from continuing operations attributable to noncontrollinginterests diluted	118	53	534	'
Income from continuing operations attributable to common stockholders - diluted	4,032	2,489	26,986	-3,947
Net Income (Loss) Available to Common Stockholders, Diluted	$4,032	$2,489	$26,986	($8,235)
Weighted Average Number of Shares Outstanding, Basic	190,646,722	152,785,451	179,138,169	152,739,130
Amount of Dilutive Securities Performance Units	68,947	'	71,699	'
Amount Of Dilutive Securities Operating Partnership And Ltip Units	5,415,974	2,942,758	3,911,372	'
Basic and Diluted	196,131,643	155,728,209	183,121,240	152,739,130
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$0.02	$0.02	$0.15	($0.02)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share	'	'	'	($0.03)
Earnings Per Share, Basic and Diluted	$0.02	$0.02	$0.15	($0.05)

Earnings_Per_Unit_of_the_Opera2

Earnings Per Unit of the Operating Partnership Earnings Per Unit of the Operating Partnership (Narrative) (Details) (BIOMED REALTY, L.P., Exchangeable Senior Notes Due 2030)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
BIOMED REALTY, L.P. \| Exchangeable Senior Notes Due 2030	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Exchangeable Senior Notes Due 2030	10,405,224	10,127,232

Earnings_Per_Unit_of_the_Opera3

Earnings Per Unit of the Operating Partnership (Computations of Basic and Diluted Earnings Per Unit) (Details) (BIOMED REALTY, L.P., USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
BIOMED REALTY, L.P.	'	'	'	'
Earnings Per Unit of the Operating Partnership	'	'	'	'
Income from continuing operations and noncontrolling interests	$4,136	$6,455	$36,633	$7,871
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest	229	7	266	16
Preferred Stock Dividends and Other Adjustments	'	-3,651	-2,393	-10,952
Cost On Redemption Of Preferred Stock	'	'	-6,531	'
Participating Securities, Distributed and Undistributed Earnings	-333	-328	-993	-959
Income (Loss) from Continuing Operations Attributable to Parent	4,032	2,483	26,982	-4,024
Income / (loss) from discontinued operations	'	'	'	-4,370
Net Income Loss Attributable To Unit Holders Basic and Diluted	$4,032	$2,483	$26,982	($8,394)
Weighted Average Number of Shares Outstanding, Basic	196,062,696	155,699,816	183,048,587	155,661,231
Amount of Dilutive Securities Performance Units	68,947	'	71,699	'
Basic and Diluted	196,131,643	155,699,816	183,120,286	155,661,231
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$0.02	$0.02	$0.15	($0.02)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share	'	'	'	($0.03)
Net Income per Unit Attributable to Unitholders, Basic and Diluted	$0.02	$0.02	$0.15	($0.05)

Investment_in_Unconsolidated_P2

Investment in Unconsolidated Partnerships (Narrative) (Details)	Sep. 30, 2013
	PREI_LLCs
Equity Method Investments and Joint Ventures [Abstract]	'
Number of Investments in Limited Liability Companies	2

Investment_in_Unconsolidated_P3

Investment in Unconsolidated Partnerships (Summary of Unconsolidated Partnerships) (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

In Millions, unless otherwise specified

PREI I LLC

PREI II LLC

McKellar Court

BioPark Fremont

properties

Investment In Unconsolidated Partnerships

Equity Method Investment, Ownership Percentage

100.00%

20.00%

[1]

20.00%

[1]

20.00%

22.00%

[2]

22.00%

[2]

50.00%

[3]

Company's Economic Interest

20.00%

[1]

20.00%

[1]

20.00%

22.00%

[2]

22.00%

[2]

50.00%

[3]

Date Acquired

4-Apr-07

[1]

4-Apr-07

30-Sep-04

[2]

31-May-13

[3]

Number Of Properties In Portfolio Of Prei I Llc

Line of Credit Facility, Amount Outstanding

$139

Line Of Credit Facility Weighted Average Interest Rate

3.19%

Line of Credit Facility, Expiration Date

13-Aug-14

Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount

$12.10

Percent Of Extraordinary Cash Flow Entitled From Variable Interest Entity

75.00%

Percent Of Operating Cash Flows Entitled From Variable Interest Entity

22.00%

[1]

PREI I LLC owns two properties in Cambridge, Massachusetts. At SeptemberB 30, 2013, there were $139.0 million in outstanding borrowings on a secured loan facility held by a wholly-owned subsidiary of PREI I LLC, with a contractual interest rate of 3.19% (including the applicable credit spread) and a maturity date of AugustB 13, 2014.

[2]

The Companybs investment in the McKellar Court partnership (maximum exposure to losses) was approximately $12.1 million at SeptemberB 30, 2013. The Companybs economic interest in the McKellar Court partnership entitles it to 75% of the extraordinary cash flows after repayment of the partnersb capital contributions and 22% of the operating cash flows.

[3]

The Company's partnership interest was acquired in connection with the Company's merger with Wexford.

Investment_in_Unconsolidated_P4

Investment in Unconsolidated Partnerships (Summary of Selected Balance Sheet Information) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]	'	'
Investments in real estate, net	$260,411	$257,666
Cash and cash equivalents (including restricted cash)	2,761	1,968
Other assets	6,097	4,370
Total assets	269,269	264,004
Mortgage notes payable and secured loan	151,954	149,255
Other liabilities	10,708	5,988
Members' equity	106,607	108,761
Total liabilities and equity	269,269	264,004
Company's net investment in unconsolidated partnerships	$31,978	$32,367

Investment_in_Unconsolidated_P5

Investment in Unconsolidated Partnerships (Summary of Selected Income Statement Information) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]	'		'		'		'
Total revenues	$3,778		$2,195		$9,486		$6,582
Total expenses	-5,328		-4,975		-16,013		-14,756
Loss from continuing operations	-1,550		-2,780		-6,527		-8,174
Company's equity in net loss of unconsolidated partnerships	-112		-339		-697		-1,011
Fees earned by the Company	$35	[1]	$22	[1]	$121	[1]	$67	[1]

[1]	The Company acts as the operating member or partner, as applicable, and day-to-day manager for the partnerships. The Company is entitled to receive fees for providing construction and development services (as applicable) and management services to the PREI joint ventures, which are reflected in tenant recoveries and other income in the consolidated statements of operations.

Derivatives_and_Other_Financia2

Derivatives and Other Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
	USD_interest_rate_swaps	USD_interest_rate_swaps
Derivative	'	'
Period Swaps Effectively Fix Interest Rate	'3 years	'
Derivative, Deferred Interest Costs Amortization Period	'5 years	'
Reclassification of Accumulated Other Comprehensive Loss	$10,000,000	'
Interest Rate Swaps	'	'
Derivative	'	'
Derivative, Notional Amount	561,630,000	561,630,000
Forward Starting Swaps	'	'
Derivative	'	'
Derivative, Deferred Interest Costs	37,100,000	37,100,000
Derivative, Lower Remaining Maturity Range	'10 years	'
Interest Rate Swaps - $200M (2) \| Interest Rate Swaps	'	'
Derivative	'	'
Derivative, Inception Date	25-Sep-13	1-Oct-13
Derivative, Number of Instruments Held	3	3
Derivative, Notional Amount	$200,000,000	$200,000,000

Derivatives_and_Other_Financia3

Derivatives and Other Financial Instruments (Summary of Derivative Instruments) (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

In Thousands, unless otherwise specified

Unsecured Term Loan Due 2017 GBP Portion

Interest Rate Swaps

Interest Rate Swaps - $200M (1)

Interest Rate Swaps - $200M (2)

Interest Rate Swap - 50M GBP (1)

Interest Rate Swap - 50M GBP (2)

Derivative

Derivative, Notional Amount

$561,630

$200,000

$80,815

[1]

$80,815

[1]

Derivative, Fixed Interest Rate

1.16%

2.20%

0.73%

[1]

0.74%

[1]

Derivative, Effective Date

30-Mar-12

25-Sep-13

1-Oct-13

2-Aug-12

[1]

2-Aug-12

[1]

Derivative, Expiration Date

30-Mar-17

1-Oct-16

30-Mar-17

[1]

30-Mar-17

[1]

Derivative, Fair Value, Net

($865)

[2]

($5,285)

[2]

($2,291)

[2]

($4,826)

[2]

($330)

[2]

($330)

[2]

$890

[1],[2]

($216)

[1],[2]

$866

[1],[2]

($243)

[1],[2]

Foreign Currency Exchange Rate, Translation

1.62

[1]

Translation to U.S. dollars is based on an exchange rate of $1.62 to £1.00 at both SeptemberB 30, 2013 and DecemberB 31, 2012

[2]

Fair-value of derivative instruments does not include any related accrued interest payable, which is included in accrued expenses on the accompanying consolidated balance sheets. Derivative valuations are classified in Level 2 of the fair-value hierarchy. Assets are included in other assets and liabilities are included in accounts payable, accrued expenses and other liabilities on the accompanying consolidated balance sheets.

Derivatives_and_Other_Financia4

Derivatives and Other Financial Instruments (Summary of Derivative Instruments, Effect on OCI) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative	'	'	'	'
Cash Flow Hedge Loss Reclassified to Other Income	$2,305	$2,252	$6,886	$6,208
Interest Rate Swaps	'	'	'	'
Derivative	'	'	'	'
Cash Flow Hedge Loss Reclassified to Other Income	600	522	1,752	999
Forward Starting Swaps	'	'	'	'
Derivative	'	'	'	'
Cash Flow Hedge Loss Reclassified to Other Income	1,705	1,730	5,134	5,209
Parent Company \| Interest Rate Swaps	'	'	'	'
Derivative	'	'	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	($1,371)	($2,523)	$2,653	($6,701)

FairValue_of_Financial_Instrum2

Fair-Value of Financial Instruments (Fair-Value and Carrying Value of the Company's Financial Instruments) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair-Value of Financial Instruments	'		'
Available-for-sale securities	$17,391	[1]	$390	[1]
Unsecured Term Loan Due 2017 GBP Portion	'		'
Fair-Value of Financial Instruments	'		'
Foreign Currency Exchange Rate, Translation	1.62		1.62
Mortgage Notes Payable	'		'
Fair-Value of Financial Instruments	'		'
Mortgage notes payable, net	716,733		571,652
Exchangeable Senior Notes	'		'
Fair-Value of Financial Instruments	'		'
Exchangeable senior notes	180,000		180,000
Unsecured Senior Notes	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	894,850		894,177
Unsecured Line of Credit	'		'
Fair-Value of Financial Instruments	'		'
Unsecured line of credit	20,000	[2],[3]	118,000	[2],[3]
Fair-Value	'		'
Fair-Value of Financial Instruments	'		'
Derivative Instruments	865	[4]	5,285	[4]
Available-for-sale securities	17,391	[5]	390	[5]
Fair-Value \| Mortgage Notes Payable	'		'
Fair-Value of Financial Instruments	'		'
Mortgage notes payable, net	738,873	[5]	605,948	[5]
Fair-Value \| Exchangeable Senior Notes	'		'
Fair-Value of Financial Instruments	'		'
Exchangeable senior notes	205,434	[5]	209,484	[5]
Fair-Value \| Unsecured Senior Notes \| Unsecured Senior Notes Due 2016	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	418,640	[5]	421,400	[5]
Fair-Value \| Unsecured Senior Notes \| Unsecured Senior Notes Due 2020	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	276,625	[5]	292,725	[5]
Fair-Value \| Unsecured Senior Notes \| Unsecured Senior Notes Due 2022	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	242,125	[5]	261,750	[5]
Fair-Value \| Unsecured Term Loans \| Unsecured Term Loan Due 2017 USD Portion \| USD	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior term loans	244,837	[5]	243,596	[5]
Fair-Value \| Unsecured Term Loans \| Unsecured Term Loan Due 2017 GBP Portion \| GBP	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior term loans	162,449	[5],[6]	161,860	[5],[6]
Fair-Value \| Unsecured Term Loans \| Unsecured Term Loan Due 2018	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior term loans	350,000	[5]	'
Fair-Value \| Unsecured Line of Credit	'		'
Fair-Value of Financial Instruments	'		'
Unsecured line of credit	20,000	[5]	118,000	[5]
Carrying Value	'		'
Fair-Value of Financial Instruments	'		'
Available-for-sale securities	17,391		390
Carrying Value \| Mortgage Notes Payable	'		'
Fair-Value of Financial Instruments	'		'
Mortgage notes payable, net	716,733		571,652
Carrying Value \| Exchangeable Senior Notes	'		'
Fair-Value of Financial Instruments	'		'
Exchangeable senior notes	180,000		180,000
Carrying Value \| Unsecured Senior Notes \| Unsecured Senior Notes Due 2016	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	398,659		398,289
Carrying Value \| Unsecured Senior Notes \| Unsecured Senior Notes Due 2020	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	248,151		247,984
Carrying Value \| Unsecured Senior Notes \| Unsecured Senior Notes Due 2022	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior notes, net	248,040		247,904
Carrying Value \| Unsecured Term Loans \| Unsecured Term Loan Due 2017 USD Portion \| USD	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior term loans	243,596		243,596
Carrying Value \| Unsecured Term Loans \| Unsecured Term Loan Due 2017 GBP Portion \| GBP	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior term loans	161,630	[6]	161,860	[6]
Carrying Value \| Unsecured Term Loans \| Unsecured Term Loan Due 2018	'		'
Fair-Value of Financial Instruments	'		'
Unsecured senior term loans	350,000		'
Carrying Value \| Unsecured Line of Credit	'		'
Fair-Value of Financial Instruments	'		'
Unsecured line of credit	$20,000		$118,000

[1]	Determination of fair-value is classified as Level 1 in the fair-value hierarchy based on the use of quoted prices in active markets.
[2]	In September 2013, the Operating Partnership amended and restated its unsecured credit agreement, providing for aggregate borrowing of up to $1.25 billion, consisting of an unsecured line of credit of $900.0 million and a term loan of $350.0 million (the Term Loan due 2018). In connection with the amendment and restatement of the credit agreement, unamortized loan fees under the previous credit agreement of approximately $462,500 were charged to interest expense.
[3]	At SeptemberB 30, 2013, the Operating Partnership had additional borrowing capacity under the unsecured line of credit of up to approximately $880.0 million.
[4]	The Companybs derivative instruments are reflected in other assets and in accounts payable, accrued expenses and other liabilities on the accompanying consolidated balance sheets based on their respective balances (see Note 9).
[5]	Fair-values of debt and derivative instruments are classified in Level 2 of the fair-value hierarchy. Fair-value of available-for-sale securities are classified in Level 1 of the fair-value hierarchy.
[6]	The principal balance represents the U.S. dollar amount based on the exchange rate of $1.62 to £1.00 at both SeptemberB 30, 2013 and DecemberB 31, 2012.

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Acquisitions (Narrative) (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2013
Business Acquisition	'	'	'
Deferred Costs and Other Assets	'	$3,700,000	$3,700,000
Tax credits, net of costs and estimated put payments	'	'	12,300,000
Tax Credits Delivered	5,000,000	'	4,100,000
Revenues	'	18,700,000	27,000,000
Net income / (loss)	'	($512,000)	$12,000
Historic and New Market Tax Credits	'	'	'
Business Acquisition	'	'	'
Syndicated Historic Tax Credits and New Market Tax Credits	'	'	7
Historic Tax Credits	'	'	'
Business Acquisition	'	'	'
Percentage of Qualified Investments	'	'	39.00%
Percentage of Tax Credit Recapture	'	'	20.00%
New Market Tax Credits	'	'	'
Business Acquisition	'	'	'
Percentage of Tax Credit Recapture	'	'	100.00%
Historical Tax Credit Recapture Period	'	'	'1 year

Acquisitions_Schedule_of_Purch

Acquisitions (Schedule of Purchase Price Allocation - excluding Merger) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition	'	'
Business Acquisition, Effective Date of Acquisition	'	5-Sep-07
Business Acquisition, Purchase Price Allocation, Property	$162,699	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	173,518	'
Woodside Technology Park	'	'
Business Acquisition	'	'
Business Acquisition, Description of Acquired Entity	'Woodside Technology Park	'
Business Acquisition, Effective Date of Acquisition	28-Feb-13	'
Business Acquisition, Purchase Price Allocation, Property	78,681	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	87,000	'
The Campus at Lincoln Centre	'	'
Business Acquisition	'	'
Business Acquisition, Description of Acquired Entity	'The Campus at Lincoln Centre	'
Business Acquisition, Effective Date of Acquisition	20-Mar-13	'
Business Acquisition, Purchase Price Allocation, Property	37,000	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	37,000	'
320 Charles Street	'	'
Business Acquisition	'	'
Business Acquisition, Description of Acquired Entity	'320 Charles Street	'
Business Acquisition, Effective Date of Acquisition	18-Jun-13	'
Business Acquisition, Purchase Price Allocation, Property	47,018	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	49,518	'
Leases, Acquired-in-Place	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	12,740	'
Finite-Lived Intangible Asset, Useful Life	'61 months	'
Leases, Acquired-in-Place \| Woodside Technology Park	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	8,162	'
Leases, Acquired-in-Place \| 320 Charles Street	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	4,578	'
Acquired Management Agreements	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	865	'
Finite-Lived Intangible Asset, Useful Life	'108 months	'
Acquired Management Agreements \| Woodside Technology Park	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	865	'
Leases, Acquired-in-Place, Market Adjustment	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	-2,786	'
Finite-Lived Intangible Asset, Useful Life	'18 months	'
Leases, Acquired-in-Place, Market Adjustment \| Woodside Technology Park	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	-708	'
Leases, Acquired-in-Place, Market Adjustment \| 320 Charles Street	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	($2,078)	'

Acquisitions_Acquisitions_Sche

Acquisitions Acquisitions (Schedule of Purchase Price Allocation - Merger) (Details) (USD $)	3 Months Ended	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2013
Leases, Acquired-in-Place	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	12,740
Finite-Lived Intangible Asset, Useful Life	'	'61 months
Leases, Acquired-in-Place, Market Adjustment	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	-2,786
Finite-Lived Intangible Asset, Useful Life	'	'18 months
Common Stock	'	'
Business Acquisition	'	'
Stock Issued During Period, Merger Issues	'	5,568,227
Limited Partner \| Common Stock	'	'
Business Acquisition	'	'
Stock Issued During Period, Units, Issued in Connection with Wexford Merger	336,960	336,960
Wexford Merger	'	'
Business Acquisition	'	'
Business Acquisition, Purchase Price Allocation, Investments in Real Estate	'	663,969
Business Acquisition, Purchase Price Allocation, Cash and Cash Equivalents	'	5,182
Business Acquisition, Purchase Price Allocation, Accounts Receivable net	'	937
Business Acquisition, Purchase Price Allocation, Deferred Leasing Costs	'	50,555
Business Acquisition, Purchase Price Allocation, Other Assets	'	82,825
Business Acquisition, Purchase Price Allocation, Total Assets	'	803,468
Business Acquisition, Purchase Price Allocation, Mortgage Notes Payable	'	254,735
Business Acquisition, Purchase Price Allocation, Other Liabilities	'	64,201
Business Acquisition, Purchase Price Allocation, Total Liabilities	'	318,936
Business Acquisition, Purchase Price Allocation, Fair Value of Net Assets Acquired	'	484,532
Business Acquisition, Cash Consideration Paid for Wexford	'	345,268
Business Acquisition, Equity Consideration Paid for Wexford	'	123,596
Business Acquisition, Contingent Consideration in Merger with Wexford	'	15,668
Business Acquisition, Total Consideration for Wexford	'	484,532
Wexford Merger \| Leases, Acquired-in-Place	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	50,600
Finite-Lived Intangible Asset, Useful Life	'	'10 years 3 months
Wexford Merger \| Above Market Leases	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	9,600
Finite-Lived Intangible Asset, Useful Life	'	'11 years 7 months
Wexford Merger \| Below Market Ground Leases	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	8,500
Finite-Lived Intangible Asset, Useful Life	'	'45 years
Wexford Merger \| Debt Premium	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	-8,700
Finite-Lived Intangible Asset, Useful Life	'	'9 years 2 months 16 days
Wexford Merger \| Leases, Acquired-in-Place, Market Adjustment	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	-31,400
Finite-Lived Intangible Asset, Useful Life	'	'13 years 5 months
Wexford Merger \| Above Market Ground Leases	'	'
Business Acquisition	'	'
Acquired Finite-lived Intangible Asset, Amount	'	-1,400
Finite-Lived Intangible Asset, Useful Life	'	'64 years 9 months

Acquisitions_Acquisitions_Sele

Acquisitions Acquisitions (Selected Financial Data of the VIEs) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Variable Interest Entity	'	'
Investment in Real Estate, Net	$332,004	$334,331
Total Assets	371,341	369,460
Total Liabilities	152,051	149,336
Wexford Merger	'	'
Variable Interest Entity	'	'
Investment in Real Estate, Net	148,660	'
Total Assets	148,662	'
Total Liabilities	$64,314	'

Acquisitions_Pro_Forma_Results

Acquisitions (Pro Forma Results) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Parent Company	'	'	'	'
Business Acquisition	'	'	'	'
Business Acquisition, Pro Forma Revenue	$159,232	$152,599	$508,911	$433,581
Business Acquisition, Pro Forma Net Income (Loss)	4,247	-2,362	26,702	-20,763
Business Acquisition Pro Forma Earnings Per Share Basic And Diluted	$0.02	($0.02)	$0.15	($0.14)
BIOMED REALTY, L.P.	'	'	'	'
Business Acquisition	'	'	'	'
Business Acquisition, Pro Forma Revenue	159,232	152,599	508,911	433,581
Business Acquisition, Pro Forma Net Income (Loss)	$4,365	($2,309)	$27,236	($20,903)
Business Acquisition Pro Forma Earnings Per Share Basic And Diluted	$0.02	($0.02)	$0.15	($0.14)

Discontinued_Operations_Discon

Discontinued Operations (Discontinued Operations) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations	'
Date of Sale	27-Apr-12
Original Acquisition Date	5-Sep-07
Sales Price	$28,000	[1]
Impairment Loss	-4,600
Forbes Boulevard	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations	'
Impairment Loss	($4,552)

[1]	The sales price was equal to the fair-value of the office property received as consideration in the exchange with the independent third party.