Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ 9,336	$ (490)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	51,453	51,721
Amortization of deferred financing costs	1,311	928
Amortization of debt discount/(premium), net	365	217
Amortization of stock compensation costs	1,484	1,800
Shares used for employee taxes upon vesting of share awards	(1,418)	(445)
Straight-line rent income	(6,908)	(4,729)
Amortization of acquired above (below) market leases to rental revenue, net	(1,419)	(1,238)
Straight-line ground rent expense	474	501
Provision for doubtful accounts	781	367
Real estate venture income in excess of distributions	163	(830)
Net gain on sale of interests in real estate	(14,666)	(2,791)
Loss on early extinguishment of debt	248	0
Changes in assets and liabilities:
Accounts receivable	976	(1,979)
Other assets	(3,629)	(4,093)
Accounts payable and accrued expenses	5,674	12,819
Deferred income, gains and rent	916	(2,649)
Deferred financing obligation	(405)	0
Other liabilities	(514)	4,427
Net cash from operating activities	44,222	53,536
Cash flows from investing activities:
Acquisition of properties	(9,226)	(22,032)
Held-to-maturity securities	(50,694)	0
Sales of properties, net	92,401	0
Capital expenditures	(21,250)	(31,292)
Advances for purchase of tenant assets, net of repayments	94	(602)
Loan provided to unconsolidated Real Estate Venture partner	0	(999)
Investment in unconsolidated Real Estate Ventures	(12,512)	0
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	619	1,496
Leasing costs	(7,386)	(4,830)
Net cash used in investing activities	(7,954)	(58,259)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000	0
Proceeds from Credit Facility	21,500	103,500
Repayments of Credit Facility	(297,000)	(89,500)
Repayments of mortgage notes payable	(2,941)	(3,913)
Deferred financing obligation non-cash interest expense	234	0
Repayments from unsecured notes	(4,217)	0
Repayments of unsecured term loan	(37,500)	0
Net settlement of hedge transactions	(74)	(613)
Debt financing costs	(8,426)	(556)
Net proceeds from issuance of shares/operating units	0	2,200
Distributions paid to shareholders/unitholders	(23,619)	(22,292)
Distributions to noncontrolling interest	(399)	(419)
Net cash from (used in) financing activities	247,558	(11,593)
Increase (decrease) in cash and cash equivalents	283,826	(16,316)
Cash and cash equivalents at beginning of period	410	16,565
Cash and cash equivalents at end of period	284,236	249
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended March 31, 2012 and 2011 of $467 and $380, respectively	10,348	14,184
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(2,608)	(853)
Change in capital expenditures financed through retention payable at period end	(163)	(5,151)
Change in unfunded tenant allowance	(612)	(814)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net loss	9,336	(490)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	51,453	51,721
Amortization of deferred financing costs	1,311	928
Amortization of debt discount/(premium), net	365	217
Amortization of stock compensation costs	1,484	1,800
Shares used for employee taxes upon vesting of share awards	(1,418)	(445)
Straight-line rent income	(6,908)	(4,729)
Amortization of acquired above (below) market leases to rental revenue, net	(1,419)	(1,238)
Straight-line ground rent expense	474	501
Provision for doubtful accounts	781	367
Real estate venture income in excess of distributions	163	(830)
Net gain on sale of interests in real estate	(14,666)	(2,791)
Loss on early extinguishment of debt	248	0
Changes in assets and liabilities:
Accounts receivable	976	(1,979)
Other assets	(3,629)	(4,093)
Accounts payable and accrued expenses	5,674	12,819
Deferred income, gains and rent	916	(2,649)
Deferred financing obligation	(405)	0
Other liabilities	(514)	4,427
Net cash from operating activities	44,222	53,536
Cash flows from investing activities:
Acquisition of properties	(9,226)	(22,032)
Held-to-maturity securities	(50,694)	0
Sales of properties, net	92,401	0
Capital expenditures	(21,250)	(31,292)
Advances for purchase of tenant assets, net of repayments	94	(602)
Loan provided to unconsolidated Real Estate Venture partner	0	(999)
Investment in unconsolidated Real Estate Ventures	(12,512)	0
Cash distributions from unconsolidated Real Estate Ventures in excess of cumulative equity income	619	1,496
Leasing costs	(7,386)	(4,830)
Net cash used in investing activities	(7,954)	(58,259)
Cash flows from financing activities:
Proceeds from New Unsecured Term Loans	600,000	0
Proceeds from Credit Facility	21,500	103,500
Repayments of Credit Facility	(297,000)	(89,500)
Repayments of mortgage notes payable	(2,941)	(3,913)
Deferred financing obligation non-cash interest expense	234	0
Repayments from unsecured notes	(4,217)	0
Repayments of unsecured term loan	(37,500)	0
Net settlement of hedge transactions	(74)	(613)
Debt financing costs	(8,426)	(556)
Net proceeds from issuance of shares/operating units	0	2,200
Distributions paid to shareholders/unitholders	(24,018)	(22,711)
Net cash from (used in) financing activities	247,558	(11,593)
Increase (decrease) in cash and cash equivalents	283,826	(16,316)
Cash and cash equivalents at beginning of period	410	16,565
Cash and cash equivalents at end of period	284,236	249
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended March 31, 2012 and 2011 of $467 and $380, respectively	10,348	14,184
Supplemental disclosure of non-cash activity:
Change in capital expenditures financed through accounts payable at period end	(2,608)	(853)
Change in capital expenditures financed through retention payable at period end	(163)	(5,151)
Change in unfunded tenant allowance	$ (612)	$ (814)