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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Initial Cost |  |  |  |
Land | $ 366,673 |  |  |
Buildings and Improvements | 2,494,108 |  |  |
Net Improvements (Retirements) Since Acquisition | 613,328 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 407,514 |  |  |
Buildings and Improvements | 3,066,595 |  |  |
Total | 3,474,109 | $ 4,006,459 | $ 3,951,719 | $ 3,830,824
Accumulated Depreciation at December 31, 2019 | 896,561 | 973,318 | $ 885,407 | $ 913,297
Pennsylvania Suburbs | Six Tower Bridge (181 Washington Street) |  |  |  |
Initial Cost |  |  |  |
Land |  | 6,927 |  |
Buildings and Improvements |  | 14,722 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,166 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 6,237 |  |
Buildings and Improvements |  | 17,578 |  |
Total |  | 23,815 |  |
Accumulated Depreciation at December 31, 2019 |  | 4,228 |  |
Pennsylvania Suburbs | 426 West Lancaster Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 1,689 |  |
Buildings and Improvements |  | 6,756 |  |
Net Improvements (Retirements) Since Acquisition |  | 8,833 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 1,686 |  |
Buildings and Improvements |  | 15,592 |  |
Total |  | 17,278 |  |
Accumulated Depreciation at December 31, 2019 |  | 512 |  |
Pennsylvania Suburbs | 52 Swedesford Square |  |  |  |
Initial Cost |  |  |  |
Land |  | 4,241 |  |
Buildings and Improvements |  | 16,579 |  |
Net Improvements (Retirements) Since Acquisition |  | (20,820) |  |
Gross Amount Which Carried |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 0 |  |
Total |  | 0 |  |
Accumulated Depreciation at December 31, 2019 |  | 0 |  |
Pennsylvania Suburbs | 640 Freedom Business Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 1,015 |  |
Buildings and Improvements |  | 20,098 |  |
Net Improvements (Retirements) Since Acquisition |  | 4,838 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 387 |  |
Buildings and Improvements |  | 25,564 |  |
Total |  | 25,951 |  |
Accumulated Depreciation at December 31, 2019 |  | 15,229 |  |
Pennsylvania Suburbs | 620 Freedom Business Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 666 |  |
Buildings and Improvements |  | 13,118 |  |
Net Improvements (Retirements) Since Acquisition |  | 1,888 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 252 |  |
Buildings and Improvements |  | 15,420 |  |
Total |  | 15,672 |  |
Accumulated Depreciation at December 31, 2019 |  | 9,416 |  |
Pennsylvania Suburbs | 1000 First Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 13,708 |  |
Net Improvements (Retirements) Since Acquisition |  | 3,235 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 16,943 |  |
Total |  | 16,943 |  |
Accumulated Depreciation at December 31, 2019 |  | 11,450 |  |
Pennsylvania Suburbs | 1060 First Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 13,665 |  |
Net Improvements (Retirements) Since Acquisition |  | 4,279 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 17,944 |  |
Total |  | 17,944 |  |
Accumulated Depreciation at December 31, 2019 |  | 11,741 |  |
Pennsylvania Suburbs | 630 Freedom Business Center Drive |  |  |  |
Initial Cost |  |  |  |
Land |  | 666 |  |
Buildings and Improvements |  | 13,251 |  |
Net Improvements (Retirements) Since Acquisition |  | 3,497 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 255 |  |
Buildings and Improvements |  | 17,159 |  |
Total |  | 17,414 |  |
Accumulated Depreciation at December 31, 2019 |  | 10,139 |  |
Pennsylvania Suburbs | 1020 First Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 10,744 |  |
Net Improvements (Retirements) Since Acquisition |  | 4,306 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 15,050 |  |
Total |  | 15,050 |  |
Accumulated Depreciation at December 31, 2019 |  | 9,726 |  |
Pennsylvania Suburbs | 1040 First Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 14,142 |  |
Net Improvements (Retirements) Since Acquisition |  | 5,218 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 0 |  |
Buildings and Improvements |  | 19,360 |  |
Total |  | 19,360 |  |
Accumulated Depreciation at December 31, 2019 |  | 12,870 |  |
Pennsylvania Suburbs | 610 Freedom Business Center Drive |  |  |  |
Initial Cost |  |  |  |
Land |  | 485 |  |
Buildings and Improvements |  | 9,602 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,554 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 185 |  |
Buildings and Improvements |  | 12,456 |  |
Total |  | 12,641 |  |
Accumulated Depreciation at December 31, 2019 |  | 7,514 |  |
Pennsylvania Suburbs | 650 Park Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 1,916 |  |
Buildings and Improvements |  | 4,378 |  |
Net Improvements (Retirements) Since Acquisition |  | (4,378) |  |
Gross Amount Which Carried |  |  |  |
Land |  | 1,916 |  |
Buildings and Improvements |  | 0 |  |
Total |  | 1,916 |  |
Accumulated Depreciation at December 31, 2019 |  | 0 |  |
Pennsylvania Suburbs | 600 Park Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 1,012 |  |
Buildings and Improvements |  | 4,048 |  |
Net Improvements (Retirements) Since Acquisition |  | 385 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 1,012 |  |
Buildings and Improvements |  | 4,433 |  |
Total |  | 5,445 |  |
Accumulated Depreciation at December 31, 2019 |  | 2,768 |  |
Pennsylvania Suburbs | 933 First Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,127 |  |
Buildings and Improvements |  | 20,794 |  |
Net Improvements (Retirements) Since Acquisition |  | (1,125) |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,127 |  |
Buildings and Improvements |  | 19,669 |  |
Total |  | 22,796 |  |
Accumulated Depreciation at December 31, 2019 |  | 3,085 |  |
Pennsylvania Suburbs | 500 North Gulph Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 1,303 |  |
Buildings and Improvements |  | 5,201 |  |
Net Improvements (Retirements) Since Acquisition |  | 21,471 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 1,303 |  |
Buildings and Improvements |  | 26,672 |  |
Total |  | 27,975 |  |
Accumulated Depreciation at December 31, 2019 |  | 2,363 |  |
Pennsylvania Suburbs | 401 Plymouth Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 6,199 |  |
Buildings and Improvements |  | 16,131 |  |
Net Improvements (Retirements) Since Acquisition |  | 15,658 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 6,199 |  |
Buildings and Improvements |  | 31,789 |  |
Total |  | 37,988 |  |
Accumulated Depreciation at December 31, 2019 |  | 15,816 |  |
Pennsylvania Suburbs | Metroplex (4000 Chemical Road) |  |  |  |
Initial Cost |  |  |  |
Land |  | 4,373 |  |
Buildings and Improvements |  | 24,546 |  |
Net Improvements (Retirements) Since Acquisition |  | 4,627 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 4,373 |  |
Buildings and Improvements |  | 29,173 |  |
Total |  | 33,546 |  |
Accumulated Depreciation at December 31, 2019 |  | 8,071 |  |
Pennsylvania Suburbs | 610 West Germantown Pike |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,651 |  |
Buildings and Improvements |  | 14,514 |  |
Net Improvements (Retirements) Since Acquisition |  | 3,578 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,651 |  |
Buildings and Improvements |  | 18,092 |  |
Total |  | 21,743 |  |
Accumulated Depreciation at December 31, 2019 |  | 8,855 |  |
Pennsylvania Suburbs | 600 West Germantown Pike |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,652 |  |
Buildings and Improvements |  | 15,288 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,463 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,652 |  |
Buildings and Improvements |  | 17,751 |  |
Total |  | 21,403 |  |
Accumulated Depreciation at December 31, 2019 |  | 8,450 |  |
Pennsylvania Suburbs | 630 West Germantown Pike |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,558 |  |
Buildings and Improvements |  | 14,743 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,189 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,558 |  |
Buildings and Improvements |  | 16,932 |  |
Total |  | 20,490 |  |
Accumulated Depreciation at December 31, 2019 |  | 8,115 |  |
Pennsylvania Suburbs | 620 West Germantown Pike |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,572 |  |
Buildings and Improvements |  | 14,435 |  |
Net Improvements (Retirements) Since Acquisition |  | 1,866 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,572 |  |
Buildings and Improvements |  | 16,301 |  |
Total |  | 19,873 |  |
Accumulated Depreciation at December 31, 2019 |  | 7,411 |  |
Pennsylvania Suburbs | 660 West Germantown Pike |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,694 |  |
Buildings and Improvements |  | 5,487 |  |
Net Improvements (Retirements) Since Acquisition |  | 19,682 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 5,405 |  |
Buildings and Improvements |  | 23,458 |  |
Total |  | 28,863 |  |
Accumulated Depreciation at December 31, 2019 |  | 6,822 |  |
Pennsylvania Suburbs | 351 Plymouth Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 1,043 |  |
Buildings and Improvements |  | 555 |  |
Net Improvements (Retirements) Since Acquisition |  | 0 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 1,043 |  |
Buildings and Improvements |  | 555 |  |
Total |  | 1,598 |  |
Accumulated Depreciation at December 31, 2019 |  | 218 |  |
Pennsylvania Suburbs | 150 Radnor Chester Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 11,925 |  |
Buildings and Improvements |  | 36,986 |  |
Net Improvements (Retirements) Since Acquisition |  | 21,658 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 11,897 |  |
Buildings and Improvements |  | 58,672 |  |
Total |  | 70,569 |  |
Accumulated Depreciation at December 31, 2019 |  | 20,187 |  |
Pennsylvania Suburbs | One Radnor Corporate Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 7,323 |  |
Buildings and Improvements |  | 28,613 |  |
Net Improvements (Retirements) Since Acquisition |  | 19,813 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 7,323 |  |
Buildings and Improvements |  | 48,426 |  |
Total |  | 55,749 |  |
Accumulated Depreciation at December 31, 2019 |  | 30,728 |  |
Pennsylvania Suburbs | 201 King of Prussia Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 8,956 |  |
Buildings and Improvements |  | 29,811 |  |
Net Improvements (Retirements) Since Acquisition |  | 4,307 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 8,949 |  |
Buildings and Improvements |  | 34,125 |  |
Total |  | 43,074 |  |
Accumulated Depreciation at December 31, 2019 |  | 20,508 |  |
Pennsylvania Suburbs | 555 Lancaster Avenue |  |  |  |
Initial Cost |  |  |  |
Land |  | 8,014 |  |
Buildings and Improvements |  | 16,508 |  |
Net Improvements (Retirements) Since Acquisition |  | 19,871 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 8,609 |  |
Buildings and Improvements |  | 35,784 |  |
Total |  | 44,393 |  |
Accumulated Depreciation at December 31, 2019 |  | 20,245 |  |
Pennsylvania Suburbs | Four Radnor Corporate Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 5,406 |  |
Buildings and Improvements |  | 21,390 |  |
Net Improvements (Retirements) Since Acquisition |  | 12,633 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 5,705 |  |
Buildings and Improvements |  | 33,724 |  |
Total |  | 39,429 |  |
Accumulated Depreciation at December 31, 2019 |  | 17,020 |  |
Pennsylvania Suburbs | Five Radnor Corporate Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 6,506 |  |
Buildings and Improvements |  | 25,525 |  |
Net Improvements (Retirements) Since Acquisition |  | 8,906 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 6,578 |  |
Buildings and Improvements |  | 34,359 |  |
Total |  | 40,937 |  |
Accumulated Depreciation at December 31, 2019 |  | 13,689 |  |
Pennsylvania Suburbs | Three Radnor Corporate Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 4,773 |  |
Buildings and Improvements |  | 17,961 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,173 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 4,791 |  |
Buildings and Improvements |  | 20,116 |  |
Total |  | 24,907 |  |
Accumulated Depreciation at December 31, 2019 |  | 10,527 |  |
Pennsylvania Suburbs | Two Radnor Corporate Center |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,937 |  |
Buildings and Improvements |  | 15,484 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,879 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,942 |  |
Buildings and Improvements |  | 18,358 |  |
Total |  | 22,300 |  |
Accumulated Depreciation at December 31, 2019 |  | 10,463 |  |
Pennsylvania Suburbs | 130 Radnor Chester Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 2,573 |  |
Buildings and Improvements |  | 8,338 |  |
Net Improvements (Retirements) Since Acquisition |  | (134) |  |
Gross Amount Which Carried |  |  |  |
Land |  | 2,567 |  |
Buildings and Improvements |  | 8,210 |  |
Total |  | 10,777 |  |
Accumulated Depreciation at December 31, 2019 |  | 3,764 |  |
Pennsylvania Suburbs | 170 Radnor Chester Road |  |  |  |
Initial Cost |  |  |  |
Land |  | 2,514 |  |
Buildings and Improvements |  | 8,147 |  |
Net Improvements (Retirements) Since Acquisition |  | 1,728 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 2,509 |  |
Buildings and Improvements |  | 9,880 |  |
Total |  | 12,389 |  |
Accumulated Depreciation at December 31, 2019 |  | 4,784 |  |
Pennsylvania Suburbs | 200 N. Radnor Chester Rd. |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,366 |  |
Buildings and Improvements |  | 0 |  |
Net Improvements (Retirements) Since Acquisition |  | 3,621 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,366 |  |
Buildings and Improvements |  | 3,621 |  |
Total |  | 6,987 |  |
Accumulated Depreciation at December 31, 2019 |  | 857 |  |
Pennsylvania Suburbs | 101 West Elm Street |  |  |  |
Initial Cost |  |  |  |
Land |  | 6,251 |  |
Buildings and Improvements |  | 25,209 |  |
Net Improvements (Retirements) Since Acquisition |  | 2,940 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 6,251 |  |
Buildings and Improvements |  | 28,149 |  |
Total |  | 34,400 |  |
Accumulated Depreciation at December 31, 2019 |  | 10,949 |  |
Pennsylvania Suburbs | 1 West Elm Street |  |  |  |
Initial Cost |  |  |  |
Land |  | 3,557 |  |
Buildings and Improvements |  | 14,249 |  |
Net Improvements (Retirements) Since Acquisition |  | 984 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 3,557 |  |
Buildings and Improvements |  | 15,233 |  |
Total |  | 18,790 |  |
Accumulated Depreciation at December 31, 2019 |  | 5,955 |  |
Pennsylvania Suburbs | Four Tower Bridge (200 Barr Harbor Drive) |  |  |  |
Initial Cost |  |  |  |
Land |  | 6,000 |  |
Buildings and Improvements |  | 14,734 |  |
Net Improvements (Retirements) Since Acquisition |  | 390 |  |
Gross Amount Which Carried |  |  |  |
Land |  | 6,000 |  |
Buildings and Improvements |  | 15,124 |  |
Total |  | 21,124 |  |
Accumulated Depreciation at December 31, 2019 |  | $ 1,213 |  |
Philadelphia CBD | Cira Centre (2929 Arch Street) |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 208,570 |  |  |
Net Improvements (Retirements) Since Acquisition | (16,549) |  |  |
Gross Amount Which Carried |  |  |  |
Land | 12,586 |  |  |
Buildings and Improvements | 179,435 |  |  |
Total | 192,021 |  |  |
Accumulated Depreciation at December 31, 2019 | 68,536 |  |  |
Philadelphia CBD | Three Logan Square (1717 Arch Street) |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 98,188 |  |  |
Net Improvements (Retirements) Since Acquisition | 83,981 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 25,195 |  |  |
Buildings and Improvements | 156,974 |  |  |
Total | 182,169 |  |  |
Accumulated Depreciation at December 31, 2019 | 46,611 |  |  |
Philadelphia CBD | One Logan Square (130 North 18th Street) |  |  |  |
Initial Cost |  |  |  |
Land | 14,496 |  |  |
Buildings and Improvements | 107,736 |  |  |
Net Improvements (Retirements) Since Acquisition | 29,992 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 14,473 |  |  |
Buildings and Improvements | 137,751 |  |  |
Total | 152,224 |  |  |
Accumulated Depreciation at December 31, 2019 | 67,932 |  |  |
Philadelphia CBD | Two Logan Square (100 North 18th Street) |  |  |  |
Initial Cost |  |  |  |
Land | 16,066 |  |  |
Buildings and Improvements | 100,255 |  |  |
Net Improvements (Retirements) Since Acquisition | 27,936 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 16,066 |  |  |
Buildings and Improvements | 128,191 |  |  |
Total | 144,257 |  |  |
Accumulated Depreciation at December 31, 2019 | 53,177 |  |  |
Philadelphia CBD | Cira Centre South Garage (129 South 30th Street) |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 76,008 |  |  |
Net Improvements (Retirements) Since Acquisition | 26,961 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 6,816 |  |  |
Buildings and Improvements | 96,153 |  |  |
Total | 102,969 |  |  |
Accumulated Depreciation at December 31, 2019 | 22,377 |  |  |
Philadelphia CBD | 1900 Market Street |  |  |  |
Initial Cost |  |  |  |
Land | 7,768 |  |  |
Buildings and Improvements | 17,263 |  |  |
Net Improvements (Retirements) Since Acquisition | 63,616 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 7,768 |  |  |
Buildings and Improvements | 80,879 |  |  |
Total | 88,647 |  |  |
Accumulated Depreciation at December 31, 2019 | 20,545 |  |  |
Philadelphia CBD | 3020 Market Street |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 21,417 |  |  |
Net Improvements (Retirements) Since Acquisition | 7,827 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 29,244 |  |  |
Total | 29,244 |  |  |
Accumulated Depreciation at December 31, 2019 | 11,501 |  |  |
Philadelphia CBD | 618-634 Market Street |  |  |  |
Initial Cost |  |  |  |
Land | 13,365 |  |  |
Buildings and Improvements | 5,791 |  |  |
Net Improvements (Retirements) Since Acquisition | 2,810 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 13,365 |  |  |
Buildings and Improvements | 8,601 |  |  |
Total | 21,966 |  |  |
Accumulated Depreciation at December 31, 2019 | 6,522 |  |  |
Philadelphia CBD | FMC Tower at Cira Centre South (2929 Walnut Street) |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 400,294 |  |  |
Net Improvements (Retirements) Since Acquisition | 18,005 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 418,299 |  |  |
Total | 418,299 |  |  |
Accumulated Depreciation at December 31, 2019 | 63,196 |  |  |
Philadelphia CBD | 2100 Market Street |  |  |  |
Initial Cost |  |  |  |
Land | 18,827 |  |  |
Buildings and Improvements | 0 |  |  |
Net Improvements (Retirements) Since Acquisition | 6,433 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 18,854 |  |  |
Buildings and Improvements | 6,406 |  |  |
Total | 25,260 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,517 |  |  |
Philadelphia CBD | 1505-11 Race Street |  |  |  |
Initial Cost |  |  |  |
Land | 3,662 |  |  |
Buildings and Improvements | 6,061 |  |  |
Net Improvements (Retirements) Since Acquisition | 8 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,670 |  |  |
Buildings and Improvements | 6,061 |  |  |
Total | 9,731 |  |  |
Accumulated Depreciation at December 31, 2019 | 25 |  |  |
Philadelphia CBD | The Bulletin Building (3025 Market Street) |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 24,377 |  |  |
Net Improvements (Retirements) Since Acquisition | 42,669 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 67,046 |  |  |
Total | 67,046 |  |  |
Accumulated Depreciation at December 31, 2019 | 4,405 |  |  |
Philadelphia CBD | 3001-3003 JFK Boulevard |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 0 |  |  |
Net Improvements (Retirements) Since Acquisition | 111 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 111 |  |  |
Total | 111 |  |  |
Accumulated Depreciation at December 31, 2019 | 17 |  |  |
Philadelphia CBD | 3025 JFK Boulevard |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 0 |  |  |
Net Improvements (Retirements) Since Acquisition | 0 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 0 |  |  |
Total | 0 |  |  |
Accumulated Depreciation at December 31, 2019 | 0 |  |  |
Metropolitan DC | 6600 Rockledge Drive |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 37,421 |  |  |
Net Improvements (Retirements) Since Acquisition | 10,036 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 47,457 |  |  |
Total | 47,457 |  |  |
Accumulated Depreciation at December 31, 2019 | 16,270 |  |  |
Metropolitan DC | 2340 Dulles Corner Boulevard |  |  |  |
Initial Cost |  |  |  |
Land | 16,345 |  |  |
Buildings and Improvements | 65,379 |  |  |
Net Improvements (Retirements) Since Acquisition | 524 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 16,129 |  |  |
Buildings and Improvements | 66,119 |  |  |
Total | 82,248 |  |  |
Accumulated Depreciation at December 31, 2019 | 23,858 |  |  |
Metropolitan DC | 1676 International Drive |  |  |  |
Initial Cost |  |  |  |
Land | 18,437 |  |  |
Buildings and Improvements | 97,538 |  |  |
Net Improvements (Retirements) Since Acquisition | 17,656 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 18,785 |  |  |
Buildings and Improvements | 114,846 |  |  |
Total | 133,631 |  |  |
Accumulated Depreciation at December 31, 2019 | 27,969 |  |  |
Metropolitan DC | 8260 Greensboro Drive |  |  |  |
Initial Cost |  |  |  |
Land | 7,952 |  |  |
Buildings and Improvements | 33,964 |  |  |
Net Improvements (Retirements) Since Acquisition | 5,313 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 8,102 |  |  |
Buildings and Improvements | 39,127 |  |  |
Total | 47,229 |  |  |
Accumulated Depreciation at December 31, 2019 | 12,664 |  |  |
Metropolitan DC | 8521 Leesburg Pike |  |  |  |
Initial Cost |  |  |  |
Land | 4,316 |  |  |
Buildings and Improvements | 30,885 |  |  |
Net Improvements (Retirements) Since Acquisition | 7,007 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 4,397 |  |  |
Buildings and Improvements | 37,811 |  |  |
Total | 42,208 |  |  |
Accumulated Depreciation at December 31, 2019 | 12,898 |  |  |
Austin, Texas | 11501 Burnet Road - Building 1 |  |  |  |
Initial Cost |  |  |  |
Land | 3,755 |  |  |
Buildings and Improvements | 22,702 |  |  |
Net Improvements (Retirements) Since Acquisition | 12 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,755 |  |  |
Buildings and Improvements | 22,714 |  |  |
Total | 26,469 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,788 |  |  |
Austin, Texas | 11501 Burnet Road - Building 2 |  |  |  |
Initial Cost |  |  |  |
Land | 2,732 |  |  |
Buildings and Improvements | 16,305 |  |  |
Net Improvements (Retirements) Since Acquisition | 1,479 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 2,732 |  |  |
Buildings and Improvements | 17,784 |  |  |
Total | 20,516 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,471 |  |  |
Austin, Texas | 11501 Burnet Road - Building 3 |  |  |  |
Initial Cost |  |  |  |
Land | 3,688 |  |  |
Buildings and Improvements | 22,348 |  |  |
Net Improvements (Retirements) Since Acquisition | 10 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,688 |  |  |
Buildings and Improvements | 22,358 |  |  |
Total | 26,046 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,729 |  |  |
Austin, Texas | 11501 Burnet Road - Building 4 |  |  |  |
Initial Cost |  |  |  |
Land | 2,614 |  |  |
Buildings and Improvements | 15,740 |  |  |
Net Improvements (Retirements) Since Acquisition | 8 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 2,614 |  |  |
Buildings and Improvements | 15,748 |  |  |
Total | 18,362 |  |  |
Accumulated Depreciation at December 31, 2019 | 2,628 |  |  |
Austin, Texas | 11501 Burnet Road - Building 5 |  |  |  |
Initial Cost |  |  |  |
Land | 3,689 |  |  |
Buildings and Improvements | 22,354 |  |  |
Net Improvements (Retirements) Since Acquisition | 13 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,689 |  |  |
Buildings and Improvements | 22,367 |  |  |
Total | 26,056 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,733 |  |  |
Austin, Texas | 11501 Burnet Road - Building 6 |  |  |  |
Initial Cost |  |  |  |
Land | 2,676 |  |  |
Buildings and Improvements | 15,972 |  |  |
Net Improvements (Retirements) Since Acquisition | 14,133 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 2,676 |  |  |
Buildings and Improvements | 30,105 |  |  |
Total | 32,781 |  |  |
Accumulated Depreciation at December 31, 2019 | 5,446 |  |  |
Austin, Texas | 11501 Burnet Road - Building 8 |  |  |  |
Initial Cost |  |  |  |
Land | 1,400 |  |  |
Buildings and Improvements | 7,422 |  |  |
Net Improvements (Retirements) Since Acquisition | 1,523 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 1,400 |  |  |
Buildings and Improvements | 8,945 |  |  |
Total | 10,345 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,536 |  |  |
Austin, Texas | 11501 Burnet Road - Parking Garage |  |  |  |
Initial Cost |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 19,826 |  |  |
Net Improvements (Retirements) Since Acquisition | 6 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 0 |  |  |
Buildings and Improvements | 19,832 |  |  |
Total | 19,832 |  |  |
Accumulated Depreciation at December 31, 2019 | 4,378 |  |  |
Austin, Texas | Four Points Centre 3, 11120 Four Points Drive |  |  |  |
Initial Cost |  |  |  |
Land | 1,140 |  |  |
Buildings and Improvements | 0 |  |  |
Net Improvements (Retirements) Since Acquisition | 40,330 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 1,141 |  |  |
Buildings and Improvements | 40,329 |  |  |
Total | 41,470 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,279 |  |  |
Austin, Texas | One Barton Skyway (1501 South MoPac Expressway) |  |  |  |
Initial Cost |  |  |  |
Land | 10,496 |  |  |
Buildings and Improvements | 47,670 |  |  |
Net Improvements (Retirements) Since Acquisition | 3,448 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 10,495 |  |  |
Buildings and Improvements | 51,119 |  |  |
Total | 61,614 |  |  |
Accumulated Depreciation at December 31, 2019 | 2,826 |  |  |
Austin, Texas | Two Barton Skyway (1601 South MoPac Expressway) |  |  |  |
Initial Cost |  |  |  |
Land | 10,849 |  |  |
Buildings and Improvements | 53,868 |  |  |
Net Improvements (Retirements) Since Acquisition | 2,820 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 10,848 |  |  |
Buildings and Improvements | 56,689 |  |  |
Total | 67,537 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,532 |  |  |
Austin, Texas | Three Barton Skyway (1221 South MoPac Expressway) |  |  |  |
Initial Cost |  |  |  |
Land | 10,374 |  |  |
Buildings and Improvements | 47,624 |  |  |
Net Improvements (Retirements) Since Acquisition | 304 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 10,373 |  |  |
Buildings and Improvements | 47,929 |  |  |
Total | 58,302 |  |  |
Accumulated Depreciation at December 31, 2019 | 2,603 |  |  |
Austin, Texas | Four Barton Skyway (1301 South MoPac Expressway) |  |  |  |
Initial Cost |  |  |  |
Land | 13,301 |  |  |
Buildings and Improvements | 57,041 |  |  |
Net Improvements (Retirements) Since Acquisition | 2,904 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 13,300 |  |  |
Buildings and Improvements | 59,946 |  |  |
Total | 73,246 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,162 |  |  |
Austin, Texas | Four Points Centre (11305 Four Points Drive) |  |  |  |
Initial Cost |  |  |  |
Land | 7,800 |  |  |
Buildings and Improvements | 43,581 |  |  |
Net Improvements (Retirements) Since Acquisition | 3,923 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 7,800 |  |  |
Buildings and Improvements | 47,504 |  |  |
Total | 55,304 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,024 |  |  |
Austin, Texas | River Place - Building 1 (6500 River Place Boulevard) |  |  |  |
Initial Cost |  |  |  |
Land | 2,004 |  |  |
Buildings and Improvements | 17,680 |  |  |
Net Improvements (Retirements) Since Acquisition | 537 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 2,004 |  |  |
Buildings and Improvements | 18,217 |  |  |
Total | 20,221 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,072 |  |  |
Austin, Texas | River Place - Building 2 (6500 River Place Boulevard) |  |  |  |
Initial Cost |  |  |  |
Land | 3,137 |  |  |
Buildings and Improvements | 29,254 |  |  |
Net Improvements (Retirements) Since Acquisition | 618 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,137 |  |  |
Buildings and Improvements | 29,872 |  |  |
Total | 33,009 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,634 |  |  |
Austin, Texas | River Place - Building 3 (6500 River Place Boulevard) |  |  |  |
Initial Cost |  |  |  |
Land | 3,064 |  |  |
Buildings and Improvements | 26,705 |  |  |
Net Improvements (Retirements) Since Acquisition | 279 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,064 |  |  |
Buildings and Improvements | 26,984 |  |  |
Total | 30,048 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,429 |  |  |
Austin, Texas | River Place - Building 4 (6500 River Place Boulevard |  |  |  |
Initial Cost |  |  |  |
Land | 2,273 |  |  |
Buildings and Improvements | 18,617 |  |  |
Net Improvements (Retirements) Since Acquisition | 1,047 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 2,273 |  |  |
Buildings and Improvements | 19,664 |  |  |
Total | 21,937 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,345 |  |  |
Austin, Texas | River Place - Building 5 (6500 River Place Boulevard) |  |  |  |
Initial Cost |  |  |  |
Land | 1,752 |  |  |
Buildings and Improvements | 14,315 |  |  |
Net Improvements (Retirements) Since Acquisition | 97 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 1,752 |  |  |
Buildings and Improvements | 14,412 |  |  |
Total | 16,164 |  |  |
Accumulated Depreciation at December 31, 2019 | 768 |  |  |
Austin, Texas | River Place - Building 6 (6500 River Place Boulevard) |  |  |  |
Initial Cost |  |  |  |
Land | 1,598 |  |  |
Buildings and Improvements | 12,945 |  |  |
Net Improvements (Retirements) Since Acquisition | 22 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 1,598 |  |  |
Buildings and Improvements | 12,967 |  |  |
Total | 14,565 |  |  |
Accumulated Depreciation at December 31, 2019 | 690 |  |  |
Austin, Texas | River Place - Building 7 (6500 River Place Boulevard) |  |  |  |
Initial Cost |  |  |  |
Land | 1,801 |  |  |
Buildings and Improvements | 16,486 |  |  |
Net Improvements (Retirements) Since Acquisition | 1,094 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 1,801 |  |  |
Buildings and Improvements | 17,580 |  |  |
Total | 19,381 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,210 |  |  |
Austin, Texas | Quarry Lake II (4516 Seton Center Parkway) |  |  |  |
Initial Cost |  |  |  |
Land | 3,970 |  |  |
Buildings and Improvements | 30,546 |  |  |
Net Improvements (Retirements) Since Acquisition | 1,024 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 3,867 |  |  |
Buildings and Improvements | 31,673 |  |  |
Total | 35,540 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,772 |  |  |
Other | 10 Foster Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 244 |  |  |
Buildings and Improvements | 971 |  |  |
Net Improvements (Retirements) Since Acquisition | 164 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 244 |  |  |
Buildings and Improvements | 1,135 |  |  |
Total | 1,379 |  |  |
Accumulated Depreciation at December 31, 2019 | 659 |  |  |
Other | 7 Foster Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 231 |  |  |
Buildings and Improvements | 921 |  |  |
Net Improvements (Retirements) Since Acquisition | 31 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 231 |  |  |
Buildings and Improvements | 952 |  |  |
Total | 1,183 |  |  |
Accumulated Depreciation at December 31, 2019 | 575 |  |  |
Other | 2 Foster Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 185 |  |  |
Buildings and Improvements | 730 |  |  |
Net Improvements (Retirements) Since Acquisition | 11 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 185 |  |  |
Buildings and Improvements | 741 |  |  |
Total | 926 |  |  |
Accumulated Depreciation at December 31, 2019 | 741 |  |  |
Other | 4 Foster Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 183 |  |  |
Buildings and Improvements | 726 |  |  |
Net Improvements (Retirements) Since Acquisition | 6 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 183 |  |  |
Buildings and Improvements | 732 |  |  |
Total | 915 |  |  |
Accumulated Depreciation at December 31, 2019 | 732 |  |  |
Other | 1 Foster Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 93 |  |  |
Buildings and Improvements | 364 |  |  |
Net Improvements (Retirements) Since Acquisition | 8 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 93 |  |  |
Buildings and Improvements | 372 |  |  |
Total | 465 |  |  |
Accumulated Depreciation at December 31, 2019 | 372 |  |  |
Other | 5 U.S. Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 21 |  |  |
Buildings and Improvements | 81 |  |  |
Net Improvements (Retirements) Since Acquisition | 2 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 21 |  |  |
Buildings and Improvements | 83 |  |  |
Total | 104 |  |  |
Accumulated Depreciation at December 31, 2019 | 83 |  |  |
Other | 5 Foster Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 9 |  |  |
Buildings and Improvements | 32 |  |  |
Net Improvements (Retirements) Since Acquisition | 3 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 9 |  |  |
Buildings and Improvements | 35 |  |  |
Total | 44 |  |  |
Accumulated Depreciation at December 31, 2019 | 35 |  |  |
Other | Main Street-Plaza 1000 |  |  |  |
Initial Cost |  |  |  |
Land | 2,732 |  |  |
Buildings and Improvements | 10,942 |  |  |
Net Improvements (Retirements) Since Acquisition | 284 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 2,732 |  |  |
Buildings and Improvements | 11,226 |  |  |
Total | 13,958 |  |  |
Accumulated Depreciation at December 31, 2019 | 11,017 |  |  |
Other | Main Street-Piazza |  |  |  |
Initial Cost |  |  |  |
Land | 696 |  |  |
Buildings and Improvements | 2,802 |  |  |
Net Improvements (Retirements) Since Acquisition | 3,631 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 704 |  |  |
Buildings and Improvements | 6,425 |  |  |
Total | 7,129 |  |  |
Accumulated Depreciation at December 31, 2019 | 3,837 |  |  |
Other | Main Street-Promenade |  |  |  |
Initial Cost |  |  |  |
Land | 532 |  |  |
Buildings and Improvements | 2,052 |  |  |
Net Improvements (Retirements) Since Acquisition | 326 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 532 |  |  |
Buildings and Improvements | 2,378 |  |  |
Total | 2,910 |  |  |
Accumulated Depreciation at December 31, 2019 | 1,432 |  |  |
Other | 920 North King Street |  |  |  |
Initial Cost |  |  |  |
Land | 6,141 |  |  |
Buildings and Improvements | 21,140 |  |  |
Net Improvements (Retirements) Since Acquisition | 8,059 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 6,141 |  |  |
Buildings and Improvements | 29,199 |  |  |
Total | 35,340 |  |  |
Accumulated Depreciation at December 31, 2019 | 14,492 |  |  |
Other | 300 Delaware Avenue |  |  |  |
Initial Cost |  |  |  |
Land | 6,369 |  |  |
Buildings and Improvements | 13,739 |  |  |
Net Improvements (Retirements) Since Acquisition | 2,657 |  |  |
Gross Amount Which Carried |  |  |  |
Land | 6,369 |  |  |
Buildings and Improvements | 16,396 |  |  |
Total | 22,765 |  |  |
Accumulated Depreciation at December 31, 2019 | $ 9,823 |  |  |

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