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Related Party Transactions - Narrative (Details) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Jul. 21, 2016 shares | Jul. 01, 2016 USD ($) ft² | Jan. 13, 2016 nominee director director_nominee | Dec. 16, 2015 ft² | Apr. 01, 2015 USD ($) ft² project director property director_nominee shares | May 31, 2016 shares | Sep. 30, 2016 ft² building | Sep. 30, 2015 ft² building | Dec. 31, 2015 ft² project property | Mar. 31, 2016 director | Dec. 15, 2015 ft²
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  |  |  |  | 820,587 | 483,862 |  |  |
Number of real estate properties acquired | building |  |  |  |  |  |  | 6 | 2 |  |  |
Directors on the board | director |  |  | 10 |  | 11 |  |  |  |  | 8 |
Director nominees on the board | director_nominee |  |  |  |  | 3 |  |  |  |  |  |
Number of director nominees who resigned | director |  |  | 1 |  |  |  |  |  |  |  |
Number of nominees able to be designated | 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% |  |  |  |  |  |  |  |
Minimum number of nominees held to increase number of directors on the board | nominee |  |  | 1 |  |  |  |  |  |  |  |
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 |  |  |  |  | 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 |  |  |  |  | 1 |  |  |  |  |  |
Holding period prior to transfers of common units |  |  |  |  | 14 months |  |  |  |  |  |
Adjusted maximum aggregate common interests for sponsor stockholders |  |  |  |  | 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 |  |  |  |  |  |
Common Units |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed during the period (in shares) | 19,000,000 |  |  |  |  | 10,000,000 |  |  |  |  |
EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  |  | 8,200,000 |  |  |  | 8,200,000 |  |
Gross payments to acquire business | $ |  |  |  |  | $ 1,750,000,000 |  |  |  |  |  |
Consideration transferred, common units (in shares) |  |  |  |  | 63,474,791 |  |  |  |  |  |
EOP Northern California Portfolio | Common Units |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, common units (in shares) |  |  |  |  | 8,626,311 |  |  |  |  |  |
EOP Northern California Portfolio | Office Building |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  |  | 26 |  |  |  | 26 |  |
EOP Northern California Portfolio | Development Parcel |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of development projects acquired | project |  |  |  |  | 2 |  |  |  | 2 |  |
11601 Wilshire Boulevard Office Building |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  | 500,475 |  |  |  |  |  |  |  |  |
Operating leases, term of contract |  | 8 years |  |  |  |  |  |  |  |  |
Total consideration | $ |  | $ 311,000,000 |  |  |  |  |  |  |  |  |
Area of leased property (in square feet) | ft² |  | 6,638 |  |  |  |  |  |  |  |  |
Annual rent cost per year | $ |  | $ 279,000 |  |  |  |  |  |  |  |  |
Blackstone Real Estate Partners |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  | 42,371 |  |  |  |  |  |  | 40,120
Operating leases, renewal term |  |  |  | 3 years |  |  |  |  |  |  |
Operating leases, term of contract |  |  |  | 10 years |  |  |  |  |  |  |

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