Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 3,919	$ 9,336
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	50,304	51,453
Amortization of deferred financing costs	1,161	1,311
Amortization of debt discount/(premium), net	366	365
Amortization of stock compensation costs	2,097	1,484
Shares used for employee taxes upon vesting of share awards	(245)	(1,418)
Straight-line rent income	(5,514)	(6,908)
Amortization of acquired above (below) market leases to rental revenue, net	(1,771)	(1,419)
Straight-line ground rent expense	474	474
Provision for doubtful accounts	505	781
Net gain on sale of interests in real estate	(5,304)	(14,666)
Loss on early extinguishment of debt	3	248
Real estate venture income in excess of distributions	(358)	163
Deferred financing obligation	(452)	(405)
Changes in assets and liabilities:
Accounts receivable	(1,321)	976
Other assets	(4,772)	(3,629)
Accounts payable and accrued expenses	10,793	5,674
Deferred income, gains and rent	46	916
Other liabilities	(88)	(514)
Net cash from operating activities	49,843	44,222
Cash flows from investing activities:
Acquisition of properties	0	(9,226)
Payments to acquire available-for-sale securities	0	(50,694)
Sales of properties, net	112,863	92,401
Distribution of sales proceeds from real estate ventures	16,963	0
Proceeds from repayment of mortgage notes receivable	200	0
Capital expenditures for tenant improvements	(24,215)	(20,733)
Capital expenditures for redevelopments	(2,427)	(517)
Capital expenditures for developments	(82)	0
Reimbursement from real estate venture for pre-formation development costs	1,976	0
Advances for purchase of tenant assets, net of repayments	(375)	94
Investment in unconsolidated Real Estate Ventures	(7,039)	(12,512)
Cash distributions from unconsolidated real estate ventures	1,357	619
Leasing costs	(8,250)	(7,386)
Net cash from (used in) investing activities	90,971	(7,954)
Cash flows from financing activities:
Proceeds from Unsecured Term Loans	0	600,000
Proceeds from Credit Facility	186,000	21,500
Repayments of Credit Facility borrowings	(255,000)	(297,000)
Repayments of mortgage notes payable	(2,765)	(2,941)
Deferred financing obligation non-cash interest expense	234	234
Repayments of unsecured notes	0	(4,217)
Repayments of unsecured term loan	0	(37,500)
Net settlement of hedge transactions	0	(74)
Debt financing costs	0	(8,426)
Exercise of stock options	672	0
Distributions paid to shareholders	(23,353)	(23,619)
Distributions to noncontrolling interest	(277)	(399)
Net cash from (used in) financing activities	(94,489)	247,558
Increase (decrease) in cash and cash equivalents	46,325	283,826
Cash and cash equivalents at beginning of period	1,549	410
Cash and cash equivalents at end of period	47,874	284,236
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended March 31, 2013 and 2012 of $625 and $467, respectively	11,367	10,348
Supplemental disclosure of non-cash activity:
Change in investments in real estate ventures related to a contribution of land	(6,058)	0
Change in capital expenditures financed through accounts payable at period end	(1,701)	(2,608)
Change in capital expenditures financed through retention payable at period end	(697)	(163)
Change in unfunded tenant allowance	(64)	(612)
Distributions payable	23,684
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Net income	3,919	9,336
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	50,304	51,453
Amortization of deferred financing costs	1,161	1,311
Amortization of debt discount/(premium), net	366	365
Amortization of stock compensation costs	2,097	1,484
Shares used for employee taxes upon vesting of share awards	(245)	(1,418)
Straight-line rent income	(5,514)	(6,908)
Amortization of acquired above (below) market leases to rental revenue, net	(1,771)	(1,419)
Straight-line ground rent expense	474	474
Provision for doubtful accounts	505	781
Net gain on sale of interests in real estate	(5,304)	(14,666)
Loss on early extinguishment of debt	3	248
Real estate venture income in excess of distributions	(358)	163
Deferred financing obligation	(452)	(405)
Changes in assets and liabilities:
Accounts receivable	(1,321)	976
Other assets	(4,772)	(3,629)
Accounts payable and accrued expenses	10,793	5,674
Deferred income, gains and rent	46	916
Other liabilities	(88)	(514)
Net cash from operating activities	49,843	44,222
Cash flows from investing activities:
Acquisition of properties	0	(9,226)
Payments to acquire available-for-sale securities	0	(50,694)
Sales of properties, net	112,863	92,401
Distribution of sales proceeds from real estate ventures	16,963	0
Proceeds from repayment of mortgage notes receivable	200	0
Capital expenditures for tenant improvements	(24,215)	(20,733)
Capital expenditures for redevelopments	(2,427)	(517)
Capital expenditures for developments	(82)	0
Reimbursement from real estate venture for pre-formation development costs	1,976	0
Advances for purchase of tenant assets, net of repayments	(375)	94
Investment in unconsolidated Real Estate Ventures	(7,039)	(12,512)
Cash distributions from unconsolidated real estate ventures	1,357	619
Leasing costs	(8,250)	(7,386)
Net cash from (used in) investing activities	90,971	(7,954)
Cash flows from financing activities:
Proceeds from Unsecured Term Loans	0	600,000
Proceeds from Credit Facility	186,000	21,500
Repayments of Credit Facility borrowings	(255,000)	(297,000)
Repayments of mortgage notes payable	(2,765)	(2,941)
Deferred financing obligation non-cash interest expense	234	234
Repayments of unsecured notes	0	(4,217)
Repayments of unsecured term loan	0	(37,500)
Net settlement of hedge transactions	0	(74)
Debt financing costs	0	(8,426)
Exercise of stock options	672	0
Distributions paid to shareholders	(23,630)	(24,018)
Net cash from (used in) financing activities	(94,489)	247,558
Increase (decrease) in cash and cash equivalents	46,325	283,826
Cash and cash equivalents at beginning of period	1,549	410
Cash and cash equivalents at end of period	47,874	284,236
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the three months ended March 31, 2013 and 2012 of $625 and $467, respectively	11,367	10,348
Supplemental disclosure of non-cash activity:
Change in investments in real estate ventures related to a contribution of land	(6,058)	0
Change in capital expenditures financed through accounts payable at period end	(1,701)	(2,608)
Change in capital expenditures financed through retention payable at period end	(697)	(163)
Change in unfunded tenant allowance	(64)	(612)
Distributions payable	$ 23,684