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SCHEDULE III (Details2) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at beginning of year | [1] | $ 4,051,325,000 |  | $ 3,519,085,000 | $ 3,264,566,000
Purchases of real estate properties |  | 353,221,000 |  | 104,205,000 | 46,240,000
Development of real estate properties and value-add properties |  | 506,154,000 |  | 415,260,000 | 195,446,000
Improvements to real estate properties |  | 40,654,000 |  | 36,692,000 | 33,522,000
Right-of-use asset, net - ground leases |  | (3,244,000) |  | 11,562,000 | (924,000)
Real estate assets held for sale |  | 0 |  | (18,233,000) | 0
Carrying amount of investments sold |  | (9,811,000) |  | (15,288,000) | (17,182,000)
Write-off of improvements |  | (3,878,000) |  | (1,958,000) | (2,583,000)
Balance at end of year | [1] | 4,934,421,000 | [2],[3] | 4,051,325,000 | 3,519,085,000
Noncontrolling Interests |  | 700,000 |  | 1,379,000 | 852,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at beginning of year |  | 1,035,617,000 |  | 955,328,000 | 871,139,000
Depreciation expense |  | 125,199,000 |  | 104,910,000 | 96,290,000
Real estate assets held for sale |  | 0 |  | (12,538,000) | 0
Accumulated depreciation on assets sold |  | (6,068,000) |  | (10,178,000) | (9,599,000)
Other |  | (3,934,000) |  | (1,905,000) | (2,502,000)
Balance at end of year |  | 1,150,814,000 | [2],[3] | $ 1,035,617,000 | $ 955,328,000
Estimated aggregate cost of real estate properties for federal income tax purposes |  | 4,569,758,000 |  |  |
Estimated accumulated tax depreciation |  | $ 870,204,000 |  |  |
Buildings [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |
Minimum [Member] | Improvements and Personal Property [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
Maximum [Member] | Improvements and Personal Property [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years |  |  |
Industrial Development & Value-Add [Member] |  |  |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at end of year |  | $ 538,449,000 |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at end of year |  | $ 1,563,000 |  |  |
Development properties [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Percentage of Occupation when property transfers from the development and value-add program to real estate properties |  | 90.00% |  |  |
Length of Time After Project Acquisition (for Value-add) or Shell Completion (for Developments) When Project Transfers to Real Estate Properties |  | 1 year |  |  |
Value-add properties [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Percentage of Occupation when property transfers from the development and value-add program to real estate properties |  | 90.00% |  |  |
Length of Time After Project Acquisition (for Value-add) or Shell Completion (for Developments) When Project Transfers to Real Estate Properties |  | 1 year |  |  |
Development and value-add properties [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Percentage of Occupation When Costs Ceased Being Capitalized for development and value-add properties |  | 90.00% |  |  |
Length of Time After Project Completion When Development Cost Ceased Being Capitalized |  | 1 year |  |  |
[1] | Includes noncontrolling interest in joint ventures of $700,000, $1,379,000 and $852,000 at December 31, 2022, 2021 and 2020, respectively.
[2] | Changes in Real Estate Properties and Development and Value-Add Properties follow:
| Years Ended December 31,
2022 |  | 2021 |  | 2020
(In thousands)
Balance at beginning of year | $ | 4,051,325 |  |  | 3,519,085 |  |  | 3,264,566 |
Purchases of real estate properties | 353,221 |  |  | 104,205 |  |  | 46,240 |
Development of real estate properties and value-add properties | 506,154 |  |  | 415,260 |  |  | 195,446 |
Improvements to real estate properties | 40,654 |  |  | 36,692 |  |  | 33,522 |
Right-of-use assets, net – ground leases | (3,244) |  |  | 11,562 |  |  | (924) |
Real estate assets held for sale | — |  |  | (18,233) |  |  | — |
Carrying amount of investments sold | (9,811) |  |  | (15,288) |  |  | (17,182) |
Write-off of improvements | (3,878) |  |  | (1,958) |  |  | (2,583) |
Balance at end of year (1) | $ | 4,934,421 |  |  | 4,051,325 |  |  | 3,519,085 |
(1) Includes noncontrolling interest in joint ventures of $700,000, $1,379,000 and $852,000 at December 31, 2022, 2021 and 2020, respectively. Changes in the accumulated depreciation on real estate properties follow:
| Years Ended December 31,
2022 |  | 2021 |  | 2020
(In thousands)
Balance at beginning of year | $ | 1,035,617 |  |  | 955,328 |  |  | 871,139 |
Depreciation expense | 125,199 |  |  | 104,910 |  |  | 96,290 |
Real estate assets held for sale | — |  |  | (12,538) |  |  | — |
Accumulated depreciation on assets sold | (6,068) |  |  | (10,178) |  |  | (9,599) |
Other | (3,934) |  |  | (1,905) |  |  | (2,502) |
Balance at end of year | $ | 1,150,814 |  |  | 1,035,617 |  |  | 955,328 |
[3] | The estimated aggregate cost of real estate properties at December 31, 2022 for federal income tax purposes was approximately $4,569,758,000 before estimated accumulated tax depreciation of $870,204,000. The federal income tax return for the year ended December 31, 2022, has not been filed and accordingly, this estimate is based on preliminary data.

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