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REAL ESTATE PROPERTIES - Sales of Real Estate (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) ft² a | Dec. 31, 2018 USD ($) ft²
Real Estate Properties [Line Items] |  |  |  |
Net Sales Price of Real Estate Sold |  | $ 20,510,000 | $ 66,559,000 | $ 22,004,000
Basis |  | 7,365,000 | 25,491,000 | 7,731,000
Gain on Sales of Real Estate Investments |  | $ 13,145,000 | $ 41,068,000 | 14,273,000
Land [Member] |  |  |  |
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
Gain on sales of land |  |  | $ 83,000 | $ 86,000
University Business Center 120 [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  | 80.00% |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage Sold |  | 80.00% |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage Sold, shown in table |  | 80.00% |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  |  | 80.00% |
University Business Center 130 [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  |  | 80.00% |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  |  | 20.00% |
University Business Center 120 [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² | [1] | 46,000 |  |
Date Of Property Sale | [1] | 12/01/2020 |  |
Net Sales Price of Real Estate Sold | [1] | $ 10,342,000 |  |
Basis | [1] | 4,007,000 |  |
Gain on Sales of Real Estate Investments | [1] | $ 6,335,000 |  |
Central Green Distribution Center [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 80,000 |  |
Date Of Property Sale |  | 12/23/2020 |  |
Net Sales Price of Real Estate Sold |  | $ 10,168,000 |  |
Basis |  | 3,358,000 |  |
Gain on Sales of Real Estate Investments |  | $ 6,810,000 |  |
World Houston International Business Ctr 5 [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 51,000 |
Date Of Property Sale |  |  | 01/29/2019 |
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] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 186,000 |
Date Of Property Sale |  |  | 05/20/2019 |
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] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² | [2] |  | 40,000 |
Date Of Property Sale | [2] |  | 11/07/2019 |
Net Sales Price of Real Estate Sold | [2] |  | $ 11,083,000 |
Basis | [2] |  | 2,729,000 |
Gain on Sales of Real Estate Investments | [2] |  | $ 8,354,000 |
Southpointe Distribution Center [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 207,000 |
Date Of Property Sale |  |  | 12/03/2019 |
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] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 133,000 |
Date Of Property Sale |  |  | 12/11/2019 |
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] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 33,000
Date Of Property Sale |  |  |  | 01/26/2018
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] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 181,000
Date Of Property Sale |  |  |  | 03/20/2018
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] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 125,000
Date Of Property Sale |  |  |  | 07/26/2018
Net Sales Price of Real Estate Sold |  |  |  | $ 7,683,000
Basis |  |  |  | 3,632,000
Gain on Sales of Real Estate Investments |  |  |  | $ 4,051,000
[1] | EastGroup owned 80% of University Business Center 120 through a joint venture partnership. EastGroup sold its 80% share of the joint venture, and the partnership was dissolved. The information shown for this transaction represents EastGroup's 80% ownership.
[2] | EastGroup owned 80% of University Business Center 130 through a joint venture partnership. The information shown for this transaction also includes the 20% attributable to the Company's noncontrolling interest partner.

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