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Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details)
12 Months Ended
Mar. 04, 2015
USD ($)
Dec. 31, 2015
USD ($)
derivative
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Aug. 22, 2013
USD ($)
Aug. 21, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jan. 11, 2012
USD ($)
Mar. 16, 2011
USD ($)
Feb. 11, 2011
USD ($)
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   $ 608,444,000                
Amount of encumbrances, net of real estate held-for-sale   608,444,000                
Initial Costs                    
Land   1,373,834,000                
Land, net of real estate held-for-sale   1,283,751,000                
Building & Improvements   4,153,701,000                
Buildings & Improvements, net of real estate held-for-sale   4,040,045,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   426,191,000                
Improvements, net of real estate held-for-sale   422,943,000                
Carrying Costs   22,797,000                
Gross Carrying Amount at December 31, 2015                    
Land   1,373,834,000                
Land, net of real estate held-for-sale   1,283,751,000                
Building & All Improvements   4,602,692,000                
Buildings & All Improvements, net of real estate held-for-sale   4,485,785,000                
Total   5,976,526,000 $ 2,239,741,000 $ 2,035,330,000     $ 1,475,955,000      
Real estate, net of real estate held-for-sale   5,769,536,000                
Accumulated depreciation   (269,074,000) [1] (134,657,000) (108,411,000)            
Accumulated depreciation, including amounts reclassified as held-for-sale   (272,724,000) [1] (142,561,000) $ (116,342,000)     $ (85,184,000)      
Long-term debt   2,278,445,000 915,003,000              
Real estate, federal income tax basis   $ 5,100,000,000                
Building Improvements                    
Gross Carrying Amount at December 31, 2015                    
Estimated useful life   39 years                
Land Improvements                    
Gross Carrying Amount at December 31, 2015                    
Estimated useful life   15 years                
Sunset Gower Sunset Bronson                    
Gross Carrying Amount at December 31, 2015                    
Long-term debt         $ 97,000,000 $ 92,000,000       $ 92,000,000
Office Building | Technicolor Building                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [2]   $ 0                
Initial Costs                    
Land [2]   6,599,000                
Building & Improvements [2]   27,187,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [2]   25,206,000                
Carrying Costs [2]   3,088,000                
Gross Carrying Amount at December 31, 2015                    
Land [2]   6,599,000                
Building & All Improvements [2]   55,481,000                
Total [2]   62,080,000                
Accumulated depreciation [1],[2]   (15,441,000)                
Office Building | 875 Howard Street Property                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [2]   0                
Initial Costs                    
Land [2]   18,058,000                
Building & Improvements [2]   41,046,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [2]   9,568,000                
Carrying Costs [2]   1,270,000                
Gross Carrying Amount at December 31, 2015                    
Land [2]   18,058,000                
Building & All Improvements [2]   51,884,000                
Total [2]   69,942,000                
Accumulated depreciation [1],[2]   (13,437,000)                
Office Building | Del Amo                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   18,000,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   1,749,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   19,749,000                
Total   19,749,000                
Accumulated depreciation [1]   (3,330,000)                
Office Building | 9300 Wilshire                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   10,718,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   1,036,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   11,754,000                
Total   11,754,000                
Accumulated depreciation [1]   (2,901,000)                
Office Building | 222 Kearny Street                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [2]   0                
Initial Costs                    
Land [2]   7,563,000                
Building & Improvements [2]   23,793,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [2]   3,497,000                
Carrying Costs [2]   0                
Gross Carrying Amount at December 31, 2015                    
Land [2]   7,563,000                
Building & All Improvements [2]   27,290,000                
Total [2]   34,853,000                
Accumulated depreciation [1],[2]   (3,996,000)                
Office Building | Rincon Center                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   102,309,000                
Initial Costs                    
Land   58,251,000                
Building & Improvements   110,656,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   14,579,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   58,251,000                
Building & All Improvements   125,235,000                
Total   183,486,000                
Accumulated depreciation [1]   (19,367,000)                
Office Building | 1455 Market                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [2]   0                
Initial Costs                    
Land [2]   41,226,000                
Building & Improvements [2]   34,990,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [2]   43,618,000                
Carrying Costs [2]   0                
Gross Carrying Amount at December 31, 2015                    
Land [2]   41,226,000                
Building & All Improvements [2]   78,608,000                
Total [2]   119,834,000                
Accumulated depreciation [1],[2]   (5,838,000)                
Office Building | 10950 Washington                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   28,407,000                
Initial Costs                    
Land   17,979,000                
Building & Improvements   25,110,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   586,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   17,979,000                
Building & All Improvements   25,696,000                
Total   43,675,000                
Accumulated depreciation [1]   (4,174,000)                
Office Building | 604 Arizona                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [2]   0                
Initial Costs                    
Land [2]   5,620,000                
Building & Improvements [2]   14,745,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [2]   1,396,000                
Carrying Costs [2]   0                
Gross Carrying Amount at December 31, 2015                    
Land [2]   5,620,000                
Building & All Improvements [2]   16,141,000                
Total [2]   21,761,000                
Accumulated depreciation [1],[2]   (1,912,000)                
Office Building | 275 Brannan Street                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   4,187,000                
Building & Improvements   8,063,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   14,018,000                
Carrying Costs   1,115,000                
Gross Carrying Amount at December 31, 2015                    
Land   4,187,000                
Building & All Improvements   23,196,000                
Total   27,383,000                
Accumulated depreciation [1]   (3,291,000)                
Office Building | 625 Second Street                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [2]   0                
Initial Costs                    
Land [2]   10,744,000                
Building & Improvements [2]   42,650,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [2]   1,877,000                
Carrying Costs [2]   0                
Gross Carrying Amount at December 31, 2015                    
Land [2]   10,744,000                
Building & All Improvements [2]   44,527,000                
Total [2]   55,271,000                
Accumulated depreciation [1],[2]   (5,238,000)                
Office Building | 6922 Hollywood                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   16,608,000                
Building & Improvements   72,392,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   4,781,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   16,608,000                
Building & All Improvements   77,173,000                
Total   93,781,000                
Accumulated depreciation [1]   (10,334,000)                
Office Building | 10900 Washington                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   1,400,000                
Building & Improvements   1,200,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   735,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   1,400,000                
Building & All Improvements   1,935,000                
Total   3,335,000                
Accumulated depreciation [1]   (359,000)                
Office Building | 901 Market                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   30,000,000                
Initial Costs                    
Land   17,882,000                
Building & Improvements   79,305,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   15,818,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   17,882,000                
Building & All Improvements   95,123,000                
Total   113,005,000                
Accumulated depreciation [1]   (9,764,000)                
Office Building | Element LA                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   168,000,000                
Initial Costs                    
Land   79,769,000                
Building & Improvements   19,755,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   85,057,000                
Carrying Costs   10,391,000                
Gross Carrying Amount at December 31, 2015                    
Land   79,769,000                
Building & All Improvements   115,203,000                
Total   194,972,000                
Accumulated depreciation [1]   (2,439,000)                
Office Building | Pinnacle I                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   129,000,000                
Initial Costs                    
Land   28,518,000                
Building & Improvements   171,657,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   4,567,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   28,518,000                
Building & All Improvements   176,224,000                
Total   204,742,000                
Accumulated depreciation [1]   (15,745,000)                
Office Building | Pinnacle II                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   86,228,000                
Initial Costs                    
Land   15,430,000                
Building & Improvements   115,537,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   217,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   15,430,000                
Building & All Improvements   115,754,000                
Total   131,184,000                
Accumulated depreciation [1]   (8,658,000)                
Office Building | 3401 Exposition                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   14,120,000                
Building & Improvements   11,319,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   11,351,000                
Carrying Costs   1,028,000                
Gross Carrying Amount at December 31, 2015                    
Land   14,120,000                
Building & All Improvements   23,698,000                
Total   37,818,000                
Accumulated depreciation [1]   (969,000)                
Office Building | First and King                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   35,899,000                
Building & Improvements   184,437,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   7,078,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   35,899,000                
Building & All Improvements   191,515,000                
Total   227,414,000                
Accumulated depreciation [1]   (13,669,000)                
Office Building | Met Park North                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   64,500,000                
Initial Costs                    
Land   28,996,000                
Building & Improvements   71,768,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   538,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   28,996,000                
Building & All Improvements   72,306,000                
Total   101,302,000                
Accumulated depreciation [1]   (5,341,000)                
Office Building | Northview                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   4,803,000                
Building & Improvements   41,191,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   78,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   4,803,000                
Building & All Improvements   41,269,000                
Total   46,072,000                
Accumulated depreciation [1]   (3,878,000)                
Office Building | 3402 Pico Blvd.                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   16,410,000                
Building & Improvements   2,136,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   3,698,000                
Carrying Costs   1,275,000                
Gross Carrying Amount at December 31, 2015                    
Land   16,410,000                
Building & All Improvements   7,109,000                
Total   23,519,000                
Accumulated depreciation [1]   0                
Office Building | Merrill Place                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   27,684,000                
Building & Improvements   29,824,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   4,712,000                
Carrying Costs   63,000                
Gross Carrying Amount at December 31, 2015                    
Land   27,684,000                
Building & All Improvements   34,599,000                
Total   62,283,000                
Accumulated depreciation [1]   (2,892,000)                
Office Building | Alaskan Way                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   0                
Cost Capitalized Subsequent to Acquisition                    
Improvements   3,143,000                
Carrying Costs   43,000                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   3,186,000                
Total   3,186,000                
Accumulated depreciation [1]   0                
Office Building | Jefferson                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   6,040,000                
Building & Improvements   31,960,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   4,193,000                
Carrying Costs   1,158,000                
Gross Carrying Amount at December 31, 2015                    
Land   6,040,000                
Building & All Improvements   37,311,000                
Total   43,351,000                
Accumulated depreciation [1]   0                
Office Building | Icon                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   0                
Cost Capitalized Subsequent to Acquisition                    
Improvements   78,146,000                
Carrying Costs   1,181,000                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   79,327,000                
Total   79,327,000                
Accumulated depreciation [1]   0                
Office Building | 4th & Traction                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   12,140,000                
Building & Improvements   37,110,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   4,274,000                
Carrying Costs   877,000                
Gross Carrying Amount at December 31, 2015                    
Land   12,140,000                
Building & All Improvements   42,261,000                
Total   54,401,000                
Accumulated depreciation [1]   0                
Office Building | 405 Mateo                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   13,040,000                
Building & Improvements   26,960,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   566,000                
Carrying Costs   428,000                
Gross Carrying Amount at December 31, 2015                    
Land   13,040,000                
Building & All Improvements   27,954,000                
Total   40,994,000                
Accumulated depreciation [1]   0                
Office Building | Palo Alto                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   326,033,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   1,107,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   327,140,000                
Total   327,140,000                
Accumulated depreciation [1]   (9,326,000)                
Office Building | Hillview                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   159,641,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   2,216,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   161,857,000                
Total   161,857,000                
Accumulated depreciation [1]   (5,397,000)                
Office Building | Embarcadero                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   41,050,000                
Building & Improvements   77,006,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   2,027,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   41,050,000                
Building & All Improvements   79,033,000                
Total   120,083,000                
Accumulated depreciation [1]   (2,261,000)                
Office Building | Foothill                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   133,994,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   7,271,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   141,265,000                
Total   141,265,000                
Accumulated depreciation [1]   (5,200,000)                
Office Building | Page Mill                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   147,625,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   583,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   148,208,000                
Total   148,208,000                
Accumulated depreciation [1]   (4,912,000)                
Office Building | Clocktower                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   93,949,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   80,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   94,029,000                
Total   94,029,000                
Accumulated depreciation [1]   (2,403,000)                
Office Building | Lockheed                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   34,561,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   29,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   34,590,000                
Total   34,590,000                
Accumulated depreciation [1]   (1,470,000)                
Office Building | 2180 Sand Hill                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   13,663,000                
Building & Improvements   50,559,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   368,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   13,663,000                
Building & All Improvements   50,927,000                
Total   64,590,000                
Accumulated depreciation [1]   (1,131,000)                
Office Building | Towers at Shore Center                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   72,673,000                
Building & Improvements   144,188,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   2,278,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   72,673,000                
Building & All Improvements   146,466,000                
Total   219,139,000                
Accumulated depreciation [1]   (3,585,000)                
Office Building | Skyway Landing                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   37,959,000                
Building & Improvements   63,559,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   (106,000)                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   37,959,000                
Building & All Improvements   63,453,000                
Total   101,412,000                
Accumulated depreciation [1]   (2,091,000)                
Office Building | Shorebreeze                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   69,448,000                
Building & Improvements   59,806,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   (78,000)                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   69,448,000                
Building & All Improvements   59,728,000                
Total   129,176,000                
Accumulated depreciation [1]   (1,715,000)                
Office Building | 555 Twin Dolphin                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   40,614,000                
Building & Improvements   73,457,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   514,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   40,614,000                
Building & All Improvements   73,971,000                
Total   114,585,000                
Accumulated depreciation [1]   (2,027,000)                
Office Building | 333 Twin Dolphin                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   36,441,000                
Building & Improvements   64,892,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   2,565,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   36,441,000                
Building & All Improvements   67,457,000                
Total   103,898,000                
Accumulated depreciation [1]   (1,712,000)                
Office Building | Peninsula Office Park                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   109,906,000                
Building & Improvements   104,180,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   3,981,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   109,906,000                
Building & All Improvements   108,161,000                
Total   218,067,000                
Accumulated depreciation [1]   (3,717,000)                
Office Building | Metro Center                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   313,683,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   6,175,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   319,858,000                
Total   319,858,000                
Accumulated depreciation [1]   (8,163,000)                
Office Building | One Bay Plaza                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   16,076,000                
Building & Improvements   33,743,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   912,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   16,076,000                
Building & All Improvements   34,655,000                
Total   50,731,000                
Accumulated depreciation [1]   (1,228,000)                
Office Building | Concourse                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   45,085,000                
Building & Improvements   224,271,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   1,463,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   45,085,000                
Building & All Improvements   225,734,000                
Total   270,819,000                
Accumulated depreciation [1]   (7,118,000)                
Office Building | Gateway                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   33,117,000                
Building & Improvements   121,217,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   2,836,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   33,117,000                
Building & All Improvements   124,053,000                
Total   157,170,000                
Accumulated depreciation [1]   (6,328,000)                
Office Building | Metro Plaza                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   16,038,000                
Building & Improvements   106,156,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   1,921,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   16,038,000                
Building & All Improvements   108,077,000                
Total   124,115,000                
Accumulated depreciation [1]   (3,238,000)                
Office Building | 1740 Technology                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   8,052,000                
Building & Improvements   49,486,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   1,734,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   8,052,000                
Building & All Improvements   51,220,000                
Total   59,272,000                
Accumulated depreciation [1]   (1,841,000)                
Office Building | Skyport Plaza                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   29,033,000                
Building & Improvements   153,844,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   207,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   29,033,000                
Building & All Improvements   154,051,000                
Total   183,084,000                
Accumulated depreciation [1]   (5,574,000)                
Office Building | Techmart Commerce                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   0                
Building & Improvements   66,660,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   2,507,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   0                
Building & All Improvements   69,167,000                
Total   69,167,000                
Accumulated depreciation [1]   (2,491,000)                
Office Building | Patrick Henry                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   9,151,000                
Building & Improvements   7,351,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   323,000                
Carrying Costs   319,000                
Gross Carrying Amount at December 31, 2015                    
Land   9,151,000                
Building & All Improvements   7,993,000                
Total   17,144,000                
Accumulated depreciation [1]   0                
Office Building | Campus Center                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   59,460,000                
Building & Improvements   79,604,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   13,000                
Carrying Costs   0                
Gross Carrying Amount at December 31, 2015                    
Land   59,460,000                
Building & All Improvements   79,617,000                
Total   139,077,000                
Accumulated depreciation [1]   (3,107,000)                
Office Building | Bayhill                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances   0                
Initial Costs                    
Land   90,083,000                
Building & Improvements   113,656,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements   $ 3,248,000                
Carrying Costs                  
Gross Carrying Amount at December 31, 2015                    
Land   $ 90,083,000                
Building & All Improvements   116,907,000                
Total   206,990,000                
Accumulated depreciation [1]   (3,650,000)                
Media & Entertainment | Sunset Gower                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [3]   0                
Initial Costs                    
Land [3]   79,321,000                
Building & Improvements [3]   64,697,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [3]   26,296,000                
Carrying Costs [3]   139,000                
Gross Carrying Amount at December 31, 2015                    
Land [3]   79,321,000                
Building & All Improvements [3]   91,132,000                
Total [3]   170,453,000                
Accumulated depreciation [1],[3]   (18,577,000)                
Media & Entertainment | Sunset Bronson                    
SEC Schedule III, Real Estate and Accumulated Depreciation                    
Encumbrances [3]   0                
Initial Costs                    
Land [3]   77,698,000                
Building & Improvements [3]   32,374,000                
Cost Capitalized Subsequent to Acquisition                    
Improvements [3]   9,639,000                
Carrying Costs [3]   422,000                
Gross Carrying Amount at December 31, 2015                    
Land [3]   77,698,000                
Building & All Improvements [3]   42,435,000                
Total [3]   120,133,000                
Accumulated depreciation [1],[3]   (11,489,000)                
Unsecured Debt                    
Gross Carrying Amount at December 31, 2015                    
Long-term debt   1,555,000,000 280,000,000              
Unsecured Debt | Unsecured Revolving Credit Facility                    
Gross Carrying Amount at December 31, 2015                    
Long-term debt   230,000,000 130,000,000              
Secured Debt                    
Gross Carrying Amount at December 31, 2015                    
Long-term debt   723,445,000 635,003,000              
Secured Debt | Sunset Gower Sunset Bronson                    
Gross Carrying Amount at December 31, 2015                    
Long-term debt   $ 115,001,000 $ 97,000,000              
Extension period   1 year                
Secured Debt | Sunset Gower And Sunset Bronson Loan                    
Gross Carrying Amount at December 31, 2015                    
Increase in borrowing capacity $ 160,000,000                  
Extension period 1 year                  
Interest Rate Caps | Sunset Gower Sunset Bronson                    
Gross Carrying Amount at December 31, 2015                    
Interest rate cap               4.25% 5.97%  
Notional amount               $ 42,000,000 $ 50,000,000  
Designated as Hedging Instrument | Interest Rate Caps                    
Gross Carrying Amount at December 31, 2015                    
Notional amount   $ 92,000,000                
Number of derivative instruments held | derivative   2                
[1] The Company computes depreciation using the straight-line method over the estimated useful lives of 39 years for building and improvements, 15 years for land improvements, and over the shorter of asset life or life of the lease for tenant improvements.
[2] These properties are secured under our line of credit, which, as of December 31, 2015, has an outstanding balance of $230.0 million.
[3] Interest on $92.0 million of the outstanding loan balance has been effectively capped at 5.97% and 4.25% per annum on $50.0 million and $42.0 million, respectively, of the loan through the use of two interest rate caps through February 11, 2016. On March 4, 2015, the terms of the loan were amended to enable the Company to draw up to an additional $160.0 million and to extend the maturity date from February 11, 2018 to March 4, 2019 with a one-year extension option.