Investment in Unconsolidated Real Estate Ventures (Textual) (Details)																					1 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
		Sep. 22, 2016 USD ($) ft²	Aug. 31, 2016 USD ($)	Aug. 19, 2016 USD ($)	Jun. 30, 2016 USD ($) ft²	Jun. 10, 2016 USD ($)	Mar. 02, 2016 USD ($)	Feb. 04, 2016 USD ($) ft² property	Jan. 29, 2016 USD ($)	Dec. 30, 2015 USD ($)	Jun. 22, 2015 USD ($) ft² a property Building	May 29, 2015 USD ($) a	Jan. 30, 2015 USD ($)	Oct. 21, 2014 USD ($)	Oct. 17, 2014 USD ($) ft² property	Oct. 15, 2014 USD ($)	Jul. 31, 2014 USD ($) ft² property Storey	Feb. 19, 2014 USD ($) ft² a Floor	Oct. 16, 2013 USD ($) ft² property	Jul. 31, 2013 USD ($) ft² a property	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)		Jun. 30, 2016 USD ($) ft²	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) property		Dec. 31, 2015 USD ($) ft² property Storey		Dec. 31, 2014 USD ($) ft² property Storey		Dec. 31, 2013 USD ($)	Dec. 31, 2011 USD ($)	Jan. 31, 2017 USD ($)	Dec. 31, 2016		Dec. 31, 2016 property	Dec. 31, 2016 ft²	Dec. 31, 2016 Real_Estate_Investment	Dec. 31, 2016 a	Dec. 31, 2016 Apartment_unit	Apr. 03, 2014 USD ($) ft² property Storey	Jan. 25, 2013 USD ($) a Storey Bed	Jul. 10, 2012 USD ($) ft² property	Dec. 20, 2011 property	Jan. 20, 2011 a	Dec. 19, 2007 ft² property
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments including net liabilities																												$ 239,874,000
Management fees																										$ 26,674,000		18,764,000		$ 17,200,000
Accounts receivable																						$ 12,446,000				12,446,000		17,126,000
Deconsolidated mortgage loan																										20,582,000		0		0
Deconsolidated financing liability																										12,384,000		0		0
Investment in Real Estate Ventures, equity method																						281,331,000				281,331,000		241,004,000		225,004,000
Capital funded to venture for mortgage debt																										28,610,000		68,549,000		46,098,000
Repayment of mortgage debt																										357,151,000		222,836,000		13,441,000
Provision for impairment of investment in real estate ventures																										7,300,000
Number of Properties | property																																					113
Proceeds from sale of real estate venture																										21,022,000		6,100,000		0
Net gain on Real Estate Venture transactions																										20,000,000		7,229,000		(417,000)
Advance received for refinancing																										195,000,000		89,000,000		0
Cash distribution from unconsolidated real estate ventures																										13,065,000		8,557,000		9,767,000
Proceeds from the sale of properties																										784,331,000		247,228,000		118,855,000
Gain (Loss) on Sale																										116,983,000		20,496,000		4,901,000
Carrying value of assets																						417,100,000				417,100,000		422,900,000
Net gain on sale of undepreciated real estate																										0		0		8,212,000
Net gain (loss) on real estate venture transactions																										20,000,000		7,418,000		(417,000)
Amount funded by corporate funds																										20,406,000		150,472,000		18,443,000
Proceeds from repayment of mortgage notes receivable																										0		88,000,000		$ 7,026,000
Real estate ventures aggregate indebtedness to third parties																						997,466,000				997,466,000		$ 794,571,000
TB-BDN Plymouth Apartments [Member]
Schedule Of Equity Method Investments [Line Items]
Construction Loan																						56,000,000				56,000,000
Guarantees, maximum exposure amount																						3,200,000				3,200,000
TB-BDN Plymouth Apartments [Member] | Subsequent Event [Member]
Schedule Of Equity Method Investments [Line Items]
Sale of ownership interest percentage																																		50.00%
Guarantee obligations cancelled																																		$ 3,200,000
1919 Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Guarantees, maximum exposure amount																						88,900,000				88,900,000
Four Points Centre [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																														192,396
Number of Properties | property																																										2
Number of floors of a building | Storey																														3												3
Number of Properties Sold | property																														2
Broadmoor Austin Associates [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²											1,112,236
Acreage of land | a											66.0
Number of Property units | property											7
Equity method investment percentage											50.00%
Payments to Acquire Land											$ 143,800,000
Encino Trace - Land [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																		320,000										320,000
Acreage of land | a																		54.1
Number of Properties | property																												2
Number of floors of a building																		4										4
Payments to Acquire Land																		$ 14,000,000
Brandywine Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage											50.00%
Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																												2,649,926		645,273								5,239,632
Number of Properties | property																																					93
Sales Price																						820,000,000				$ 820,000,000		$ 374,600,000		$ 101,150,000
Number of Properties Sold | property																										66		27		8
Proceeds from the sale of properties																										$ 769,799,000		$ 340,098,000		$ 113,024,000
Gain (Loss) on Sale																										116,983,000	[1]	22,002,000	[2],[3]	$ 4,646,000	[4]
Office Properties [Member] | Four Points Centre [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																														192,396
Sales Price																														$ 20,750,000
Number of Properties Sold | property																														2
Proceeds from the sale of properties																														$ 34,392,000
Gain (Loss) on Sale	[4],[5]																													(255,000)
Office Properties [Member] | Broadmoor Austin Associates [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Properties | Building											7
Office Properties [Member] | 3141 Fairview Park Drive [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																																						587,317
Real Estate Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Management fees																										19,800,000		18,800,000
Accounts receivable																						1,400,000				1,400,000		1,700,000
Unconsolidated Real Estate Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							14
Equity Method Investments including net liabilities																						281,300,000				281,300,000
Investment in Real Estate Ventures, equity method	[6],[7]																					281,331,000				281,331,000		241,004,000
Real estate ventures aggregate indebtedness to third parties																						997,466,000				997,466,000
Unconsolidated Real Estate Ventures [Member] | Minimum [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																			20.00%
Unconsolidated Real Estate Ventures [Member] | Maximum [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																			70.00%
Unconsolidated Real Estate Ventures [Member] | Seven Real Estate Ventures [Member] | Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							7
Rentable Square Feet | ft²																																						8,000,000
Unconsolidated Real Estate Ventures [Member] | Two Real Estate Ventures [Member] | Undeveloped Land [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							2
Acreage of land | a																																								4.3
Unconsolidated Real Estate Ventures [Member] | Two Other Real Estate Ventures [Member] | Under Active Development Land [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							2
Acreage of land | a																																								1.4
Unconsolidated Real Estate Ventures [Member] | Two Other Real Estate Ventures [Member] | Residential Tower One [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							1
Number of Property units																																					345				345
Unconsolidated Real Estate Ventures [Member] | Two Other Real Estate Ventures [Member] | Residential Tower Two [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							1
Number of Property units																																					321				321
Unconsolidated Real Estate Ventures [Member] | One Real Estate Venture [Member] | Apartment Complex [Member]
Schedule Of Equity Method Investments [Line Items]
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment																																							1
Number of Property units																																					398				398
Brandywine - AI Venture LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																			50.00%	[8],[9]									50.00%
Investment in Real Estate Ventures, equity method	[9]																					67,809,000				67,809,000		50,760,000
Provision for impairment of investment in real estate ventures																										10,400,000
Effective interest rate	[9]																																		3.96%
Real estate ventures aggregate indebtedness to third parties	[9]																					131,539,000				131,539,000		132,717,000
Brandywine - AI Venture LLC [Member] | 3141 Fairview Park Drive [Member]
Schedule Of Equity Method Investments [Line Items]
Deconsolidated net assets			$ 45,600,000
Deconsolidated mortgage loan			20,600,000
Deconsolidated financing liability			12,400,000
Investment in Real Estate Ventures, equity method			$ 12,600,000
Recognizing gain or loss on sale																								$ 0
Capital funded to venture for mortgage debt																					$ 10,300,000
Repayment of mortgage debt																						20,600,000
Brandywine - AI Venture LLC [Member] | Station Square [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																																												497,896
Equity method investment percentage																																												50.00%
Provision for impairment of investment in real estate ventures																									$ 10,400,000
Number of Properties | property																																												3
Cost of equity method investment																																												$ 120,600,000
Equity method investment other than temporary impairment charge																									5,200,000
Brandywine - AI Venture LLC [Member] | Remaining Properties in Real Estate Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment other than temporary impairment charge																										0
Brandywine - AI Venture LLC [Member] | Current Creek Investments, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																													50.00%
Brandywine - AI Venture LLC [Member] | Office Properties [Member] | 3141 Fairview Park Drive [Member]
Schedule Of Equity Method Investments [Line Items]
Number of office properties owned | property																																													3
PJP V [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage		25.00%
Investment in Real Estate Ventures, equity method	[10]																					0				0		305,000
Proceeds from sale of real estate venture		$ 3,400,000
Equity in income (loss) of Real Estate Ventures		200,000
Net gain on Real Estate Venture transactions		$ 3,200,000
Real estate ventures aggregate indebtedness to third parties	[10]																					0				0		5,035,000
PJP V [Member] | Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²		73,997
Invesco Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in income (loss) of Real Estate Ventures				$ 0
Net gain on Real Estate Venture transactions				7,000,000
Amount of proceeds, net of closing costs				$ 7,000,000
1000 Chesterbrook [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage					50.00%																			50.00%
Proceeds from sale of real estate venture					$ 9,800,000
Net gain on Real Estate Venture transactions					3,200,000
Sales Price					32,100,000																			$ 32,100,000
Debt assumed by buyer					$ 23,200,000
Working capital contribution																					$ 200,000				$ 200,000
1000 Chesterbrook [Member] | One Real Estate Venture [Member] | Office Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²					172,286																			172,286
evo at Cira Centre South Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage							50.00%																																				30.00%
Investment in Real Estate Ventures, equity method							$ 28,300,000
Cost of equity method investment																																											$ 4,000,000
Number of floors of a building | Storey																																											33
Student housing bed capacity | Bed																																											850
Area of developed parcels of land (in acres) owned by a Real Estate Venture | a																																											1
Equity Method Investment, Underlying Equity in Net Assets																																											$ 8,500,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity																																											$ 4,500,000
Cash paid to acquire real estate ventures							$ 12,800,000
Equity method investment percentage of interests acquired by the Company and HSRE							30.00%
Construction Loan						$ 97,800,000
Debt instrument maturity date						Jul. 25, 2016
Cash distribution from unconsolidated real estate ventures						$ 6,300,000
Guarantor obligations, current carrying value																						52,500,000				$ 52,500,000
evo at Cira Centre South Venture [Member] | Secured Debt [Member]
Schedule Of Equity Method Investments [Line Items]
Debt instrument maturity date						Oct. 31, 2019
Term loans						$ 117,000,000
Debt instrument, description of variable rate basis																										LIBOR + 2.25
Debt instrument optional extended maturity date						Jun. 30, 2021
Advance received for refinancing						$ 105,000,000
Additional capacity under the term loan may be funded if certain criterion relating to the operating performance of the student housing tower are met						$ 12,000,000
evo at Cira Centre South Venture [Member] | Secured Debt [Member] | LIBOR [Member]
Schedule Of Equity Method Investments [Line Items]
Debt instrument, basis spread on variable rate						2.25%
evo at Cira Centre South Venture [Member] | Campus Crest Properties, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																											30.00%
evo at Cira Centre South Venture [Member] | HSRE, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage							50.00%																																				40.00%
Cash paid to acquire real estate ventures							$ 6,600,000
evo at Cira Centre South Venture [Member] | Maximum [Member] | Secured Debt [Member]
Schedule Of Equity Method Investments [Line Items]
Effective interest rate						5.25%
MAP Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage	[8],[11]																																		50.00%
Investment in Real Estate Ventures, equity method	[11]																					20,893,000				$ 20,893,000		0
Real estate ventures aggregate indebtedness to third parties	[11]																					180,800,000				180,800,000		0
MAP Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²								3,924,783
Equity method investment percentage								50.00%
Sales Price								$ 398,100,000
Number of Properties Sold | property								58
Percentage of fee interests in land sold								100.00%
Ground lease annual payments																										$ 11,900,000
Ground lease annual rent expense increase percentage																																			2.50%
Reassessment period for change in ground lease annual payments																										10 years
Ground Lease Terms																										Annual payments by the MAP Venture, as tenant under the Ground Leases, initially total $11.9 million and increase 2.5% annually through November 2025.
Non-Recourse Debt								$ 180,800,000
Proceeds from the sale of properties								354,000,000
Ownership percentage value								$ 25,200,000
Coppell Associates [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage									50.00%
Proceeds from sale of real estate venture									$ 4,600,000
Gain (Loss) on Sale									5,700,000
Real estate ventures aggregate indebtedness to third parties	[12]																					0				$ 0		15,515,000
Coppell Associates [Member] | Other Liabilities [Member]
Schedule Of Equity Method Investments [Line Items]
Investment in Real Estate Ventures, equity method									$ 1,100,000																			1,100,000
Residence Inn Tower Bridge [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage										50.00%
Investment in Real Estate Ventures, equity method										$ 900,000												0	[10]			0	[10]	0	[10]
Proceeds from sale of real estate venture										6,100,000
Gain (Loss) on Sale										5,200,000
Real estate ventures aggregate indebtedness to third parties	[10]																					0				0		0
51 N 50 Patterson [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage												70.00%																							70.00%	[8]
Investment in Real Estate Ventures, equity method																						20,318,000				20,318,000		16,725,000
Payments to Acquire Land												$ 15,200,000
Area owned by real estate venture of undeveloped parcels of land | a												0.9
Real estate ventures aggregate indebtedness to third parties																						0				0		0
51 N 50 Patterson [Member] | JBG [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage												30.00%
Payments to Acquire Land												$ 6,500,000
1250 First Street Office [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage												70.00%																							70.00%	[8]
Investment in Real Estate Ventures, equity method																						17,304,000				17,304,000		14,312,000
Payments to Acquire Land												$ 13,200,000
Area owned by real estate venture of undeveloped parcels of land | a												0.5
Real estate ventures aggregate indebtedness to third parties																						0				0		0
1250 First Street Office [Member] | JBG [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage												30.00%
Payments to Acquire Land												$ 5,700,000
25 M Street [Member]
Schedule Of Equity Method Investments [Line Items]
Carrying value of assets										$ 20,500,000												22,400,000				22,400,000
GI Interchange Office LLC (DRA — N. PA) [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																																															1,611,961
Number of Properties | property																																															29
GI Interchange Office LLC (DRA — N. PA) [Member] | Brandywine Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																															20.00%
Brandywine Nineteen Nineteen Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																			50.00%	[8],[13],[14]										50.00%
Investment in Real Estate Ventures, equity method	[13],[14]																					27,462,000				$ 27,462,000		29,086,000
Area of developed parcels of land (in acres) owned by a Real Estate Venture | a																																														1
Debt instrument, description of variable rate basis																										LIBOR + 2.00
Payments to Acquire Land																																	$ 9,300,000
Remeasurement gain or loss on investments																$ 0
Real estate ventures aggregate indebtedness to third parties	[13],[14]																					79,250,000				$ 79,250,000		19,411,000
Brandywine Nineteen Nineteen Ventures [Member] | LCOR/CalSTRS [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage														50.00%
Aggregate gross sales price of a joint venture														$ 16,400,000
General Partners' Contributed Capital														5,200,000
Net gain on sale of undepreciated real estate														$ 8,200,000
Outstanding construction loan																						79,300,000				79,300,000
Equity method investments, Cash contributions																										29,600,000
Austin Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²															590,881		232,274
Equity method investment percentage	[8],[13]																																		50.00%
Investment in Real Estate Ventures, equity method	[13]																					52,886,000				52,886,000		60,427,000
Number of Properties | property															7		2
Effective interest rate	[13]																																		3.36%
Equity method investments, Cash contributions															$ 18,900,000		$ 12,800,000
Equity method investments, Closing costs															200,000		100,000
Equity method investment, Consideration transferred																	48,200,000
Mortgage loans outstanding																	$ 34,500,000
Mortgage loans interest rate																	3.87%
Equity Method Investments Purchase Adjustments																	$ 900,000
Business acquisition cost of acquired entity transaction costs borne by seller																	600,000
Amount funded by corporate funds															128,100,000
Short-term Bank Loans and Notes Payable															$ 88,000,000
Real estate ventures aggregate indebtedness to third parties	[13]																					405,734,000				405,734,000		410,066,000
Austin Joint Venture [Member] | Four Points Centre [Member]
Schedule Of Equity Method Investments [Line Items]
Non-Recourse Debt																																										$ 29,000,000
Austin Joint Venture [Member] | Brandywine Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																			50.00%
Area of Real Estate Property | ft²																			1,398,826
Aggregate gross sales price of a joint venture																			$ 330,000,000
Equity method investments, Cash contributions																	$ 6,400,000
Number of properties contributed to a joint venture | property																			7
Equity method investment, agreement to pay future capital expenditures																			$ 5,200,000													$ 800,000
Equity Method Investment, Additional Distribution Rights																																			10.00%
Net gain (loss) on real estate venture transactions																																$ 25,900,000
Austin Joint Venture [Member] | Brandywine Realty Trust [Member] | Four Points Centre [Member]
Schedule Of Equity Method Investments [Line Items]
Net gain on Real Estate Venture transactions																														(200,000)
Aggregate gross sales price of a joint venture																																										41,500,000
Amount Of Participant Contribution																																										$ 5,900,000
Austin Joint Venture [Member] | DRA Advisors LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage																																			50.00%
Non-Recourse Debt																			230,600,000
Equity Method Investment, Distribution, Net of Initial Funding Agreement																			266,300,000
Amount Of Participant Contribution																			49,700,000
Equity method investments, Closing costs																			1,900,000
Closing Prorations and Lender Holdbacks																			6,900,000
Proceeds from Equity Method Investment, Dividends or Distributions																			$ 271,500,000
Austin Joint Venture [Member] | Office Properties [Member] | Four Points Centre [Member]
Schedule Of Equity Method Investments [Line Items]
Rentable Square Feet | ft²																																										192,396
Austin, Texas [Member]
Schedule Of Equity Method Investments [Line Items]
Number of floors of a building | Storey																	3
Austin, Texas [Member] | Brandywine Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment, agreement to pay future capital expenditures																														$ 4,400,000
River Place [Member]
Schedule Of Equity Method Investments [Line Items]
Proceeds from repayment of mortgage notes receivable													$ 88,000,000
4040 Wilson Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage	[8]																																		50.00%
Investment in Real Estate Ventures, equity method																						36,356,000				36,356,000		36,626,000
Capital funded to venture for mortgage debt																				$ 72,000,000
Number of Properties | property																				8
Area of Real Estate Property | ft²																				426,000
Area owned by real estate venture of undeveloped parcels of land | a																				1.3
Equity method investments, Cash contributions																				$ 36,000,000
Equity Method Investment, Budgeted Total Project Cost																				202,000,000
Real estate ventures aggregate indebtedness to third parties																						1,004,000				1,004,000		0
4040 Wilson Venture [Member] | Brandywine Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Cash paid to acquire real estate ventures																				36,000,000						35,600,000
4040 Wilson Venture [Member] | Ashton Park [Member]
Schedule Of Equity Method Investments [Line Items]
Fair value of land, net of amount encumbered																				$ 36,000,000
PJP VII [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment percentage	[8]																																		25.00%
Investment in Real Estate Ventures, equity method																						980,000				980,000		872,000
Real estate ventures aggregate indebtedness to third parties																						4,956,000				4,956,000		$ 5,621,000
Guarantees, maximum exposure amount																						$ 400,000				$ 400,000

[1] Gain/(Loss) on Sale is net of closing and other transaction related costs.

[2] Gain on Sale is net of closing and other transaction related costs.

[3] Total gain on sale does not include a deferred gain of $0.5 million related to a prior sale.

[4] Gain/(Loss) on sale is net of closing and other transaction related costs.

[5] On April 3, 2014, the Company contributed two three-story, Class A office buildings, commonly known as “Four Points Centre,” containing an aggregate of approximately 192,396 net rentable square feet in Austin, Texas to an existing real estate venture (the “Austin Venture”) that the Company formed in 2013 with G&I VII Austin Office LLC, an investment vehicle advised by DRA Advisors LLC (“DRA”). The Company contributed the properties to the Austin Venture at an agreed upon value of $41.5 million. In conjunction with the contribution: (i) the Austin Venture obtained a $29.0 million mortgage loan; (ii) DRA contributed $5.9 million in net cash to the capital of the Austin Venture; and (iii) the Austin Venture distributed $34.4 million to the Company and credited the Company with a $5.9 million capital contribution to the Austin Venture. The Company incurred a $0.2 million loss on the contribution, driven primarily by closing costs.

[6] Does not include the negative investment balance of one real estate venture totaling $1.1 million as of December 31, 2015, which is included in other liabilities. The Company disposed of its interest in this venture on January 29, 2016. See “Coppell Associates” section below for further details.

[7] This amount includes the effect of the basis difference between the Company’s historical cost basis and the basis recorded at the Real Estate Venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing Real Estate Ventures and upon the transfer of assets that were previously owned by the Company into a Real Estate Venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the Real Estate Venture level.

[8] Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.

[9] See “Brandywine AI Venture: 3141 Fairview Park Drive” section below for information discussing activity that occurred during 2016 relating to this venture.

[10] The Company liquidated its 25% ownership interest in the PJP V real estate venture on September 22, 2016. On June 30, 2016, the Company liquidated its 50% ownership interest in the venture known as 1000 Chesterbrook. The ownership interest in Invesco, L.P. was sold prior to December 31, 2015, and on August 19, 2016, the Company assigned its residual profits interest to the general partner of Invesco. The Company purchased the remaining 50% interest in Broadmoor Austin Associates on June 22, 2015. The ownership interest in Residence Inn Tower Bridge was sold on December 30, 2015. See below for further detail on 2016 dispositions.

[11] In order to fulfill interest rate protection requirements, a LIBOR interest rate cap of 1.75% was purchased, effective February 3, 2016 and maturing February 9, 2018, for a notional amount of $200.8 million. There are three options to extend the maturity date of the debt for three successive terms, each year representing a separate option.

[12] Carrying amount represents the negative investment balance of the venture that was included in other liabilities as of December 31, 2015. The ownership interest in this venture was disposed of on January 29, 2016.

[13] The basis differences associated with these ventures are allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization). The Company increased its ownership interest in the HSRE-BDN I, LLC venture (also referred to as the “Evo at Cira South Venture”) to 50% on March 2, 2016. On June 10, 2016, HSRE-BDN I, LLC refinanced its debt. See “Evo at Cira South Venture” section below for further details on these transactions.

[14] The stated rate for the construction loan is LIBOR + 2.00%. It is further reduced to 1.75% upon reaching 90% residential occupancy and commencement of the lease in the retail space. To fulfill interest rate protection requirements, an interest rate cap was purchased at 4.50%.