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REAL ESTATE PROPERTIES REAL ESTATE PROPERTIES 2 (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) ft² a | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) ft²
Sales of real estate properties [Line Items] |  |  |  |
Net Sales Price of Real Estate Sold |  | $ 66,559,000 | $ 22,004,000 | $ 37,557,000
Basis |  | 25,491,000 | 7,731,000 | 15,702,000
Gain on Sales of Real Estate Investments |  | $ 41,068,000 | $ 14,273,000 | $ 21,855,000
World Houston International Business Ctr 5 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 51,000 |  |
Date Of Property Sale |  | Jan. 29, 2019 |  |
Net Sales Price of Real Estate Sold |  | $ 3,679,000 |  |
Basis |  | (1,354,000) |  |
Gain on Sales of Real Estate Investments |  | $ 2,325,000 |  |
Altamonte Commerce Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 186,000 |  |
Date Of Property Sale |  | May 20, 2019 |  |
Net Sales Price of Real Estate Sold |  | $ 14,423,000 |  |
Basis |  | 5,342,000 |  |
Gain on Sales of Real Estate Investments |  | $ 9,081,000 |  |
University Business Center 130 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² | [1] | 40,000 |  |
Date Of Property Sale | [1] | Nov. 07, 2019 |  |
Net Sales Price of Real Estate Sold | [1] | $ 11,083,000 |  |
Basis | [1] | 2,729,000 |  |
Gain on Sales of Real Estate Investments | [1] | $ 8,354,000 |  |
Southpointe Distribution Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 207,000 |  |
Date Of Property Sale |  | Dec. 03, 2019 |  |
Net Sales Price of Real Estate Sold |  | $ 13,699,000 |  |
Basis |  | (2,281,000) |  |
Gain on Sales of Real Estate Investments |  | $ 11,418,000 |  |
University Business Center 125 and 175 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 133,000 |  |
Date Of Property Sale |  | Dec. 11, 2019 |  |
Net Sales Price of Real Estate Sold |  | $ 23,675,000 |  |
Basis |  | (13,785,000) |  |
Gain on Sales of Real Estate Investments |  | $ 9,890,000 |  |
World Houston International Business Ctr 18 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 33,000 |
Date Of Property Sale |  |  | Jan. 26, 2018 |
Net Sales Price of Real Estate Sold |  |  | $ 2,289,000 |
Basis |  |  | 1,211,000 |
Gain on Sales of Real Estate Investments |  |  | $ 1,078,000 |
56th Street Commerce Park [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 181,000 |
Date Of Property Sale |  |  | Mar. 20, 2018 |
Net Sales Price of Real Estate Sold |  |  | $ 12,032,000 |
Basis |  |  | 2,888,000 |
Gain on Sales of Real Estate Investments |  |  | $ 9,144,000 |
35th Avenue Distribution Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 125,000 |
Date Of Property Sale |  |  | Jul. 26, 2018 |
Net Sales Price of Real Estate Sold |  |  | $ 7,683,000 |
Basis |  |  | 3,632,000 |
Gain on Sales of Real Estate Investments |  |  | 4,051,000 |
Stemmons Circle [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 99,000
Date Of Property Sale |  |  |  | May 12, 2017
Net Sales Price of Real Estate Sold |  |  |  | $ 5,051,000
Basis |  |  |  | 1,329,000
Gain on Sales of Real Estate Investments |  |  |  | $ 3,722,000
Techway Southwest I, II, III, & IV [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 415,000
Date Of Property Sale |  |  |  | Jun. 19, 2017
Net Sales Price of Real Estate Sold |  |  |  | $ 32,506,000
Basis |  |  |  | 14,373,000
Gain on Sales of Real Estate Investments |  |  |  | 18,133,000
Land [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
SIze (in acres) of land sold | a |  | 0.2 |  |
Proceeds from Sale of Property, Plant, and Equipment |  | $ 185,000 | 2,577,000 | 3,778,000
Gain on sales of land |  | $ 83,000 | $ 86,000 | $ 293,000
University Business Center 130 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  | 80.00% |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 20.00% |  |
[1] | EastGroup owned 80% of University Business Center 130 through a joint venture. The information shown for this transaction also includes the 20% attributable to the Company's noncontrolling interest partner.

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