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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
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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 |  |  |

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