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Related Party Transactions - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 21, 2016
shares
Jul. 01, 2016
USD ($)
Jan. 13, 2016
director_nominee
director
Dec. 16, 2015
ft²
Apr. 01, 2015
USD ($)
ft²
project
director_nominee
property
director
shares
May 31, 2016
shares
Jun. 30, 2016
USD ($)
ft²
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2016
USD ($)
ft²
building
Jun. 30, 2015
USD ($)
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             820,587 223,679 820,587 223,679      
Number of real estate properties acquired | building                 6 1      
Directors on the board | director     10   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                    
Minimum rent expense             $ 2,900,000 $ 3,000,000 $ 5,900,000 $ 3,300,000      
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                
Common Units                          
Related Party Transaction [Line Items]                          
Number of shares redeemed during the period (in shares) | shares           10,000,000              
Subsequent Event | Common Units                          
Related Party Transaction [Line Items]                          
Number of shares redeemed during the period (in shares) | shares 19,000,000                        
11601 Wilshire Boulevard Office Building | Subsequent Event                          
Related Party Transaction [Line Items]                          
Payments to purchase office building   $ 311,000,000                      
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) | shares         63,474,791                
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]                          
Development projects acquired | project         2           2    
Corporate Office Operating Leases                          
Related Party Transaction [Line Items]                          
Leases, future minimum payments due             $ 21,171,000   21,171,000        
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                  
Minimum rent expense                 $ 1,000,000