Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 7,763	$ 288,240
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	131,303	145,314
Amortization of deferred financing costs	2,127	2,195
Amortization of debt discount/(premium), net	(1,463)	(55)
Amortization of stock compensation costs	5,732	5,544
Straight-line rent income	(10,641)	(8,903)
Amortization of acquired above (below) market leases, net	(3,929)	(3,657)
Ground rent expense	712	1,092
Provision for doubtful accounts	940	1,041
Net gain on sale of interests in real estate	(3,045)	(274,688)
Loss from unconsolidated real estate ventures, net of distributions	20,798	9,880
Income tax provision (benefit)	46	(224)
Changes in assets and liabilities:
Accounts receivable	672	(6,263)
Other assets	(8,562)	(7,527)
Accounts payable and accrued expenses	3,650	10,782
Deferred income, gains and rent	914	(8,856)
Other liabilities	(6,298)	8,549
Net cash provided by operating activities	140,719	162,464
Cash flows from investing activities:
Acquisition of properties	0	(11,432)
Proceeds from the sale of properties	10,303	122,055
Proceeds from insurance	1,250	0
Proceeds from note receivable	50,000	0
Capital expenditures for tenant improvements	(30,168)	(55,262)
Capital expenditures for redevelopments	(18,705)	(18,664)
Capital expenditures for developments	(26,694)	(51,435)
Advances for the purchase of tenant assets, net of repayments	279	1,265
Investment in unconsolidated real estate ventures	(27,210)	(719)
Capital distributions from unconsolidated real estate ventures	7,499	6,916
Leasing costs paid	(11,475)	(16,747)
Net cash used in investing activities	(44,921)	(24,023)
Cash flows from financing activities:
Repayments of mortgage notes payable	0	(6,105)
Proceeds from credit facility borrowings	116,000	170,500
Repayments of credit facility borrowings	(116,000)	(170,500)
Exercise of stock options, net	(63)	47
Shares used for employee taxes upon vesting of share awards	(1,762)	(1,346)
Partner contributions to consolidated real estate venture	2,765	0
Repurchase and retirement of common shares	0	(60,000)
Redemption of limited partnership units	(2,334)	0
Distributions paid to shareholders	(97,637)	(98,651)
Distributions to noncontrolling interest	(547)	(561)
Net cash used in financing activities	(99,578)	(166,616)
Decrease in cash and cash equivalents and restricted cash	(3,780)	(28,175)
Cash and cash equivalents and restricted cash at beginning of period	47,077	91,170
Cash and cash equivalents and restricted cash at end of period	43,297	62,995
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	46,344	90,499
Restricted cash, beginning of period	733	671
Cash and cash equivalents and restricted cash at beginning of period	47,077	91,170
Cash and cash equivalents, end of period	42,484	62,256
Restricted cash, end of period	813	739
Cash and cash equivalents and restricted cash at end of period	43,297	62,995
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2021 and 2020 of $6,348 and $3,462, respectively	45,786	51,733
Cash paid for income taxes	23	719
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,763	32,705
Change in investment in real estate ventures as a result of dispositions	32,761	0
Change in operating real estate from deconsolidation of operating properties	(30,073)	269,268
Change in investment in real estate ventures from deconsolidation of operating properties	0	(263,358)
Change in mortgage notes payable from deconsolidation of operating properties	0	(220,271)
Change in other assets as a result of deconsolidation of operating properties	(2,688)	0
Change in capital expenditures financed through accounts payable at period end	6,653	(8,244)
Change in capital expenditures financed through retention payable at period end	(1,473)	754
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Cash flows from operating activities:
Net income	7,763	288,240
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	131,303	145,314
Amortization of deferred financing costs	2,127	2,195
Amortization of debt discount/(premium), net	(1,463)	(55)
Amortization of stock compensation costs	5,732	5,544
Straight-line rent income	(10,641)	(8,903)
Amortization of acquired above (below) market leases, net	(3,929)	(3,657)
Ground rent expense	712	1,092
Provision for doubtful accounts	940	1,041
Net gain on sale of interests in real estate	(3,045)	(274,688)
Loss from unconsolidated real estate ventures, net of distributions	20,798	9,880
Income tax provision (benefit)	46	(224)
Changes in assets and liabilities:
Accounts receivable	672	(6,263)
Other assets	(8,562)	(7,527)
Accounts payable and accrued expenses	3,650	10,782
Deferred income, gains and rent	914	(8,856)
Other liabilities	(6,298)	8,549
Net cash provided by operating activities	140,719	162,464
Cash flows from investing activities:
Acquisition of properties	0	(11,432)
Proceeds from the sale of properties	10,303	122,055
Proceeds from insurance	1,250	0
Proceeds from note receivable	50,000	0
Capital expenditures for tenant improvements	(30,168)	(55,262)
Capital expenditures for redevelopments	(18,705)	(18,664)
Capital expenditures for developments	(26,694)	(51,435)
Advances for the purchase of tenant assets, net of repayments	279	1,265
Investment in unconsolidated real estate ventures	(27,210)	(719)
Capital distributions from unconsolidated real estate ventures	7,499	6,916
Leasing costs paid	(11,475)	(16,747)
Net cash used in investing activities	(44,921)	(24,023)
Cash flows from financing activities:
Repayments of mortgage notes payable	0	(6,105)
Proceeds from credit facility borrowings	116,000	170,500
Repayments of credit facility borrowings	(116,000)	(170,500)
Exercise of stock options, net	(63)	47
Shares used for employee taxes upon vesting of share awards	(1,762)	(1,346)
Partner contributions to consolidated real estate venture	2,765	0
Repurchase and retirement of common shares	0	(60,000)
Redemption of limited partnership units	(2,334)	0
Distributions paid to shareholders	(98,184)	(99,212)
Net cash used in financing activities	(99,578)	(166,616)
Decrease in cash and cash equivalents and restricted cash	(3,780)	(28,175)
Cash and cash equivalents and restricted cash at beginning of period	47,077	91,170
Cash and cash equivalents and restricted cash at end of period	43,297	62,995
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	46,344	90,499
Restricted cash, beginning of period	733	671
Cash and cash equivalents and restricted cash at beginning of period	47,077	91,170
Cash and cash equivalents, end of period	42,484	62,256
Restricted cash, end of period	813	739
Cash and cash equivalents and restricted cash at end of period	43,297	62,995
Supplemental disclosure:
Cash paid for interest, net of capitalized interest during the nine months ended September 30, 2021 and 2020 of $6,348 and $3,462, respectively	45,786	51,733
Cash paid for income taxes	23	719
Supplemental disclosure of non-cash activity:
Dividends and distributions declared but not paid	32,763	32,705
Change in investment in real estate ventures as a result of dispositions	32,761	0
Change in operating real estate from deconsolidation of operating properties	(30,073)	269,268
Change in investment in real estate ventures from deconsolidation of operating properties	0	(263,358)
Change in mortgage notes payable from deconsolidation of operating properties	0	(220,271)
Change in other assets as a result of deconsolidation of operating properties	(2,688)	0
Change in capital expenditures financed through accounts payable at period end	6,653	(8,244)
Change in capital expenditures financed through retention payable at period end	$ (1,473)	$ 754