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Schedule III Real Estate and Accumulated Depreciation - Summary of Activity (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property
Reconciliation of total real estate carrying value |  |  |
Balance at Beginning of Period | $ 19,637,626,852 | $ 16,566,601,986 | $ 15,027,043,415
Acquisitions | 2,163,707,260 | 3,644,884,106 | 1,802,745,841
Less amounts allocated to acquired lease intangible assets and liabilities on our Consolidated Balance Sheets | (382,849,836) | (401,318,627) | (89,474,897)
Improvements, Etc. | 6,194,424 | 17,447,145 | 23,043,158
Other (Leasing Costs and Building Adjustments as a result of net debt premiums) (1) | 22,489,716 | 2,740,797 | 2,839,574
Total Additions | 1,809,541,564 | 3,263,753,421 | 1,739,153,676
Cost of Real Estate sold | 253,505,789 | 129,736,613 | 165,023,825
Cost of Equipment sold | 24,799 | 11,200 | 15,650
Releasing costs | 258,513 | 673,647 | 232,089
Other (including Provisions for Impairment) (2) | 195,003,525 | 87,951,488 | 34,323,541
Total Deductions | 448,792,626 | 218,372,948 | 199,595,105
Foreign Currency Translation | 49,958,270 | 25,644,393 | 0
Balance at Close of Period | 21,048,334,060 | 19,637,626,852 | 16,566,601,986
Reconciliation of accumulated depreciation |  |  |
Balance at Beginning of Period | 3,140,854,604 | 2,723,085,290 | 2,350,544,126
Additions During Period - Provision for Depreciation | 531,908,615 | 481,498,979 | 432,482,396
Accumulated depreciation of real estate and equipment sold or disposed of | 110,914,744 | 64,053,838 | 59,941,232
Foreign Currency Translation | 1,329,222 | 324,174 | 0
Balance at Close of Period | $ 3,563,177,697 | 3,140,854,604 | $ 2,723,085,290
Other Disclosure Notes |  |  |
Number of properties | property | 6,593 |  |
Number of properties secured by mortgages | property | 68 |  |
Unamortized net debt premiums on mortgages payable excluded from encumbrances | $ 1,700,000 |  |
Aggregate cost for federal income tax purposes | 22,741,595,516 |  |
Reclassification of right of use assets under finance leases | $ 22,500,000 | $ 36,900,000 |
Number of properties on which provisions for impairment were recorded | property | 99 | 51 | 44
U.S. | Single-client properties |  |  |
Other Disclosure Notes |  |  |
Number of properties | property | 6,503 |  |
U.S. | Corporate headquarters |  |  |
Other Disclosure Notes |  |  |
Number of properties | property | 1 |  |
U.S. | Single-client properties - Crest Net Lease |  |  |
Other Disclosure Notes |  |  |
Number of properties | property | 13 |  |
U.S. | Multi-client properties |  |  |
Other Disclosure Notes |  |  |
Number of properties | property | 34 |  |
U.K. | Single-client properties |  |  |
Other Disclosure Notes |  |  |
Number of properties | property | 39 |  |
U.K. | Multi-client properties |  |  |
Other Disclosure Notes |  |  |
Number of properties | property | 3 |  |
Crest Net Lease, Inc |  |  |
Other Disclosure Notes |  |  |
Aggregate cost for federal income tax purposes | $ 92,643,698 |  |

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