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SCHEDULE III SCHEDULE III (Details2) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Year Constructed |  | 1998 |  |  |
Encumbrances |  | $ 189,038,000 |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at beginning of year | [1] | 2,578,748,000 |  | $ 2,407,029,000 | $ 2,219,465,000
Purchases of real estate properties |  | 54,537,000 |  | 51,802,000 | 22,228,000
Development of real estate properties |  | 167,667,000 |  | 124,938,000 | 203,765,000
Improvements to real estate properties |  | 36,921,000 |  | 28,698,000 | 23,188,000
Carrying amount of investments sold |  | (18,372,000) |  | (32,787,000) | (61,121,000)
Write-off of improvements |  | (2,356,000) |  | (932,000) | (496,000)
Balance at end of year | [1] | 2,817,145,000 | [2],[3] | 2,578,748,000 | 2,407,029,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at beginning of year |  | 749,601,000 |  | 694,250,000 | 657,454,000
Depreciation expense |  | 76,007,000 |  | 69,010,000 | 63,793,000
Accumulated depreciation on assets sold |  | (8,670,000) |  | (12,735,000) | (26,501,000)
Other |  | (2,023,000) |  | (924,000) | (496,000)
Balance at end of year |  | 814,915,000 | [2],[3] | $ 749,601,000 | $ 694,250,000
Estimated aggregate cost of real estate properties for federal income tax purposes |  | 2,771,697,000 |  |  |
Estimated accumulated tax depreciation |  | $ 573,441,000 |  |  |
Percentage of Occupation When Development Cost Ceased Being Capitalized |  | 90.00% |  | 80.00% |
Length of Time After Project Completion When Development Cost Ceased Being Capitalized |  | 1 year |  | 1 year |
Secured debt |  | $ 188,461,000 |  | $ 199,512,000 |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land | [2],[3] | 484,279,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements | [2],[3] | 1,087,145,000 |  |  |
Costs Capitalized Subsequent to Acquisition | [2],[3] | 1,245,721,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount | [2],[3] | 487,477,000 |  |  |
Buildings and Improvements | [2],[3] | $ 2,329,668,000 |  |  |
University Business Center [Member] |  |  |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Noncontrolling Interests (in hundreths) |  | 20.00% |  | 20.00% |
Noncontrolling Interests |  | $ 3,296,000 |  | $ 3,217,000 |
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 |  |  |
Dominguez, Industry I and III, Kingsview, Shaw, Walnut and Washington [Member] |  |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Secured debt |  | $ 46,725,000 |  | 49,580,000 |
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 | [4] | 47,445,000 |  | 50,161,000 |
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 |  | 40,046,000 |  | 42,315,000 |
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 |  | 52,115,000 |  | $ 55,317,000 |
Industrial Development [Member] |  |  |  |  |
Encumbrances | [5] | 0 |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at end of year | [5] | 263,664,000 |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at end of year | [5] | 184,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land | [5] | 105,736,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements | [5] | 9,211,000 |  |  |
Costs Capitalized Subsequent to Acquisition | [5] | 148,717,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount | [5] | 106,793,000 |  |  |
Buildings and Improvements | [5] | $ 156,871,000 |  |  |
[1] | Includes 20% noncontrolling interest in University Business Center of $3,296,000 and $3,217,000 at December 31, 2018 and 2017, respectively.
[2] | Changes in Real Estate Properties follow: Years Ended December 31,2018 2017 2016(In thousands)Balance at beginning of year $2,578,748 2,407,029 2,219,465Purchases of real estate properties 54,537 51,802 22,228Development of real estate properties and value-add properties167,667 124,938 203,765Improvements to real estate properties36,921 28,698 23,188Carrying amount of investments sold (18,372) (32,787) (61,121)Write-off of improvements (2,356) (932) (496)Balance at end of year (1) $2,817,145 2,578,748 2,407,029(1)Includes 20% noncontrolling interest in University Business Center of $3,296,000 and $3,217,000 at December 31, 2018 and 2017, respectively.Changes in the accumulated depreciation on real estate properties follow: Years Ended December 31,2018 2017 2016(In thousands)Balance at beginning of year $749,601 694,250 657,454Depreciation expense 76,007 69,010 63,793Accumulated depreciation on assets sold (8,670) (12,735) (26,501)Other (2,023) (924) (496)Balance at end of year $814,915 749,601 694,250
[3] | The estimated aggregate cost of real estate properties at December 31, 2018 for federal income tax purposes was approximately $2,771,697,000 before estimated accumulated tax depreciation of $573,441,000. The federal income tax return for the year ended December 31, 2018, has not been filed and accordingly, this estimate is based on preliminary data.
[4] | Subsequent to December 31, 2018, the Company executed a collateral release for World Houston 5; this property is no longer considered to be collateral securing this loan.
[5] | Effective January 1, 2018, the Company began transferring development projects from Development and value-add properties to Real estate properties at the earlier of 90% occupancy or one year after completion of the shell construction. Prior to 2018, the Company transferred development projects to Real estate properties the earlier of 80% occupancy or one year after completion of the shell construction.

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