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SCHEDULE III (Details2) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Encumbrances | [1],[2] | $ 79,096,000 |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at beginning of year | [3] | 3,264,566,000 |  | $ 2,817,145,000 | $ 2,578,748,000
Purchases of real estate properties |  | 46,240,000 |  | 135,033,000 | 54,537,000
Development of real estate properties |  | 195,446,000 |  | 318,288,000 | 167,667,000
Improvements to real estate properties |  | 33,522,000 |  | 37,558,000 | 36,921,000
Right-of-use asset, ground leases, net of amortization |  | (924,000) |  | 11,997,000 | 0
Carrying amount of investments sold |  | (17,182,000) |  | (51,662,000) | (18,372,000)
Write-off of improvements |  | (2,583,000) |  | (3,793,000) | (2,356,000)
Balance at end of year | [3] | 3,519,085,000 | [1],[2] | 3,264,566,000 | 2,817,145,000
Noncontrolling Interests |  | 852,000 |  | 3,148,000 |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at beginning of year |  | 871,139,000 |  | 814,915,000 | 749,601,000
Depreciation expense |  | 96,290,000 |  | 86,590,000 | 76,007,000
Accumulated depreciation on assets sold |  | (9,599,000) |  | (27,030,000) | (8,670,000)
Other |  | (2,502,000) |  | (3,336,000) | (2,023,000)
Balance at end of year |  | 955,328,000 | [1],[2] | 871,139,000 | $ 814,915,000
Estimated aggregate cost of real estate properties for federal income tax purposes |  | 3,464,143,000 |  |  |
Estimated accumulated tax depreciation |  | 688,740,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land | [1],[2] | 655,023,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements | [1],[2] | 1,251,222,000 |  |  |
Costs Capitalized Subsequent to Acquisition | [1],[2] | 1,601,767,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount | [1],[2] | 659,511,000 |  |  |
Buildings and Improvements | [1],[2] | 2,848,501,000 |  |  |
Secured debt, carrying amount |  | $ 79,096,000 |  | 133,422,000 |
Buildings [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Estimated useful life (in years) |  | 40 years |  |  |
Minimum [Member] | Improvements and Personal Property [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Estimated useful life (in years) |  | 3 years |  |  |
Maximum [Member] | Improvements and Personal Property [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Estimated useful life (in years) |  | 15 years |  |  |
Colorado Crossing, Interstate I-III, Rojas, Steele Creek 1 & 2, Venture and World Houston 3-9 |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Secured debt, carrying amount | [4] | $ 41,610,000 |  | 44,596,000 |
Arion 18, Beltway VI & VII, Commerce Park II & III, Concord Dist Ctr, Interstate Dist Ctr V, VI & VII, Lakeview Business Ctr, Ridge Creek Distribution Ctr II, Southridge IV & V and World Houston 32 [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Secured debt, carrying amount |  | 35,220,000 |  | 37,682,000 |
40th Avenue, Beltway Crossing V, Centennial Park, Executive Airport, Interchange Park I, Ocean View, Wetmore 5-8 and World Houston 26, 28, 29 and 30 [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Secured debt, carrying amount |  | 0 |  | $ 48,772,000 |
Industrial Development [Member] |  |  |  |  |
Encumbrances |  | 0 |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at end of year |  | 359,588,000 |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at end of year |  | 755,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land |  | 156,415,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements |  | 18,228,000 |  |  |
Costs Capitalized Subsequent to Acquisition |  | 184,945,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount |  | 156,772,000 |  |  |
Buildings and Improvements |  | $ 202,816,000 |  |  |
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 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 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] | Changes in Real Estate Properties and Development and Value-Add Properties follow:
| Years Ended December 31,
2020 |  | 2019 |  | 2018
(In thousands)
Balance at beginning of year | $ | 3,264,566 |  |  | 2,817,145 |  |  | 2,578,748 |
Purchases of real estate properties | 46,240 |  |  | 135,033 |  |  | 54,537 |
Development of real estate properties and value-add properties | 195,446 |  |  | 318,288 |  |  | 167,667 |
Improvements to real estate properties | 33,522 |  |  | 37,558 |  |  | 36,921 |
Right-of-use assets, net – ground leases | (924) |  |  | 11,997 |  |  | — |
Carrying amount of investments sold | (17,182) |  |  | (51,662) |  |  | (18,372) |
Write-off of improvements | (2,583) |  |  | (3,793) |  |  | (2,356) |
Balance at end of year (1) | $ | 3,519,085 |  |  | 3,264,566 |  |  | 2,817,145 |
(1)Includes noncontrolling interest in joint ventures of $852,000 and $3,148,000 at December 31, 2020 and 2019, respectively. Changes in the accumulated depreciation on real estate properties follow:
| Years Ended December 31,
2020 |  | 2019 |  | 2018
(In thousands)
Balance at beginning of year | $ | 871,139 |  |  | 814,915 |  |  | 749,601 |
Depreciation expense | 96,290 |  |  | 86,590 |  |  | 76,007 |
Accumulated depreciation on assets sold | (9,599) |  |  | (27,030) |  |  | (8,670) |
Other | (2,502) |  |  | (3,336) |  |  | (2,023) |
Balance at end of year | $ | 955,328 |  |  | 871,139 |  |  | 814,915 |
[2] | The estimated aggregate cost of real estate properties at December 31, 2020 for federal income tax purposes was approximately $3,464,143,000 before estimated accumulated tax depreciation of $688,740,000. The federal income tax return for the year ended December 31, 2020, has not been filed and accordingly, this estimate is based on preliminary data.
[3] | Includes noncontrolling interest in joint ventures of $852,000 and $3,148,000 at December 31, 2020 and 2019, respectively.
[4] | During 2019, the Company executed a collateral release for World Houston 5; this property was sold during 2019 and is no longer considered to be collateral securing this loan.

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