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Investment in Real Estate - Real Estate Investment Property (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
ft²
May 31, 2017
USD ($)
ft²
a
Apr. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
ft²
Oct. 31, 2016
USD ($)
ft²
Jul. 31, 2016
USD ($)
ft²
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
ft²
Jun. 29, 2017
USD ($)
May 01, 2017
USD ($)
Business Acquisition [Line Items]                    
Land       $ 1,155,037     $ 1,302,907 $ 1,155,037    
Building and improvements       4,069,005     4,480,993 4,069,005    
Tenant improvements       354,940     411,706 354,940    
Furniture and fixtures       4,264     8,608 4,264    
Property under development       295,234     219,227 295,234    
Investment in real estate, at cost       5,878,480     $ 6,423,441 $ 5,878,480    
Area of real estate acquired | ft²             373,150 968,831    
Purchase price of properties acquired, asset acquisitions             $ 253,200      
Purchase price of properties acquired               $ 640,800    
Area of real estate property | ft²             367,487      
Notes payable             $ 2,439,311      
Investment in real estate, asset acquisitions             255,848      
Deferred leasing costs and lease intangibles, asset acquisitions       36,198     1,886 36,198    
Total assets assumed       637,981     $ 257,734 637,981    
Deferred leasing costs and in-place lease intangibles                    
Business Acquisition [Line Items]                    
Weighted average amortization period             1 year 2 months 15 days      
Secured Debt | Hill7                    
Business Acquisition [Line Items]                    
Notes payable       101,000       101,000    
Sunset Las Palmas Studios                    
Business Acquisition [Line Items]                    
Asset acquisition, equipment purchased   $ 2,800                
Investment in real estate, asset acquisitions                   $ 202,723
Deferred leasing costs and lease intangibles, asset acquisitions                   1,741
Total assets assumed                   204,464
Sunset Las Palmas Studios | Revolving Credit Facility                    
Business Acquisition [Line Items]                    
Proceeds from unsecured lines of credit     $ 150,000              
11601 Wilshire Land                    
Business Acquisition [Line Items]                    
Investment in real estate, asset acquisitions                   50,034
Deferred leasing costs and lease intangibles, asset acquisitions                   0
Total assets assumed                   $ 50,034
6666 Santa Monica                    
Business Acquisition [Line Items]                    
Investment in real estate, asset acquisitions                 $ 3,091  
Deferred leasing costs and lease intangibles, asset acquisitions                 145  
Total assets assumed                 $ 3,236  
Hill7                    
Business Acquisition [Line Items]                    
Joint venture, ownership percentage         55.00%          
Deferred leasing costs and lease intangibles, asset acquisitions       7,617       7,617    
Total assets assumed       180,167       180,167    
Page Mill Hill                    
Business Acquisition [Line Items]                    
Deferred leasing costs and lease intangibles, asset acquisitions       14,697       14,697    
Total assets assumed       $ 149,895       $ 149,895    
Media & Entertainment | Sunset Las Palmas Studios                    
Business Acquisition [Line Items]                    
Area of real estate acquired | ft²   369,000                
Purchase price of properties acquired, asset acquisitions   $ 200,000                
Area of real estate property | a   15                
Media & Entertainment | 6666 Santa Monica                    
Business Acquisition [Line Items]                    
Area of real estate acquired | ft² 4,150                  
Purchase price of properties acquired, asset acquisitions $ 3,200                  
Office | 11601 Wilshire                    
Business Acquisition [Line Items]                    
Area of real estate acquired | ft²           500,475        
Purchase price of properties acquired, business acquisitions           $ 311,000        
Office | 11601 Wilshire Land                    
Business Acquisition [Line Items]                    
Purchase price of properties acquired, asset acquisitions $ 50,000                  
Office | Hill7                    
Business Acquisition [Line Items]                    
Area of real estate acquired | ft²         285,680          
Purchase price of properties acquired, asset acquisitions         $ 179,800          
Office | Page Mill Hill                    
Business Acquisition [Line Items]                    
Area of real estate acquired | ft²       182,676            
Purchase price of properties acquired, asset acquisitions       $ 150,000