Related Party Transactions - Narrative (Details)	Dec. 16, 2015 ft²	Apr. 01, 2015 USD ($) ft² project property director_nominee director shares	Dec. 15, 2015 ft²	Mar. 31, 2015 director
Related Party Transaction [Line Items]
Directors on the board | director		11		8
Director nominees on the board | director_nominee		3
Equity consideration, lower threshold for three nominee designations		50.00%
Number of director nominees designated, sponsor stockholders, equity consideration, 30% to 50% | director_nominee		2
Number of director nominees designated, sponsor stockholders, equity consideration, 15% to 30% | director_nominee		1
Equity consideration, lower threshold for nominee designations		15.00%
Maximum directors on the board | director		12
Number of nominees permitted to be appointed to committees, given sponsor stockholders' right to designate two director nominees | director_nominee		1
Upper threshold of equity interests for sponsor stockholders' restrictions		10.00%
Aggregate maximum common stock issuable without written consent | shares		16,843,028
Upper threshold of sponsor stockholders' equity consideration to maintain proxy voting		15.00%
Holding period for redemption of units and grants		14 months
Number of shares used in exchange valuation | shares		1
Holding period prior to transfers of common units		14 months
Adjusted maximum aggregate common interests for sponsor stockholders | shares		17,707,056
Maximum tenant ownership allowable for sponsor stockholders to reach excepted holder limit, overall company excluding Market street		9.90%
Maximum tenant ownership allowable for sponsor stockholders to reach excepted holder limit, Market street		5.45%
Maximum tenant ownership allowable for sponsor stockholders to reach excepted holder limit, minimum ownership percentage after exclusions		2.00%
Maximum rental income expected to be produced by tenants allowable for sponsor stockholders to reach excepted holder limit, overall company excluding Market street		0.50%
Maximum rental income expected to be produced by tenants allowable for sponsor stockholders to reach excepted holder limit, Market street		0.50%
Minimum period between qualified offerings		120 days
Qualified offerings, minimum amount | $		$ 50,000,000
Upper threshold for sponsor stockholders' equity consideration at which company cannot consummate significant transactions		9.80%
Maximum aggregate value of units for redemption | $		$ 50,000,000
EOP Northern California Portfolio
Related Party Transaction [Line Items]
Area of real estate property | ft²		8,200,000
Gross payments to acquire business | $		$ 1,750,000,000
Consideration transferred, common units | shares		63,474,791
EOP Northern California Portfolio | Office Building
Related Party Transaction [Line Items]
Number of real estate properties acquired | property		26
EOP Northern California Portfolio | Development Parcel
Related Party Transaction [Line Items]
Development projects acquired | project		2
Blackstone Real Estate Partners
Related Party Transaction [Line Items]
Area of real estate property | ft²	42,371		40,120
Operating leases, renewal term	3 years
Operating leases, term of contract	10 years