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REAL ESTATE PROPERTIES - Sales of Real Estate (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) ft² | Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) ft²
Real Estate Properties [Line Items] |  |  |  |
Net Sales Price of Real Estate Sold |  | $ 44,260,000 | $ 20,510,000 | $ 66,559,000
Basis |  | 5,401,000 | 7,365,000 | 25,491,000
Gain on Sales of Real Estate Investments |  | $ 38,859,000 | $ 13,145,000 | $ 41,068,000
Land [Member] | Yosemite Land |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
SIze (in acres) of land sold | ft² |  |  |  | 0.2
Proceeds from Sale of Property, Plant, and Equipment |  |  |  | $ 185,000
Gain on sales of land |  |  |  | $ 83,000
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% |
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%
Jetport Commerce Park [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 284,000 |  |
Date Of Property Sale |  | 11/09/2021 |  |
Net Sales Price of Real Estate Sold |  | $ 44,260,000 |  |
Basis |  | 5,401,000 |  |
Gain on Sales of Real Estate Investments |  | $ 38,859,000 |  |
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
[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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