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Schedule III - Real Estate and Accumulated Depreciation (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
property
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Gross Leasable Area | property 7,285,779      
Initial cost to the Company, Land $ 262,286,000      
Initial cost to the Company, Building and Improvements 798,333,000      
Subsequent cost capitalized [1] 227,905,000      
Gross carrying amount of Land 259,968,000      
Gross carrying amount of building and improvements 1,028,556,000      
SEC Schedule III, Real Estate, Gross, Total 1,288,524,000 $ 1,527,478,000 [2] $ 1,515,206,000 $ 1,508,682,000
Accumulated Depreciation $ 409,742,000 $ 428,569,000 $ 389,861,000 $ 361,969,000
Academy Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2001      
Percent Owned 100.00%      
Gross Leasable Area | property 136,685      
Initial cost to the Company, Land $ 2,406,000      
Initial cost to the Company, Building and Improvements 9,623,000      
Subsequent cost capitalized [1] 6,322,000      
Gross carrying amount of Land 2,406,000      
Gross carrying amount of building and improvements 15,945,000      
SEC Schedule III, Real Estate, Gross, Total 18,351,000      
Accumulated Depreciation $ 7,175,000      
Academy Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1965      
Academy Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2013      
Big Y Shopping Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2013      
Percent Owned 100.00%      
Year built/Year last renovated 2007      
Gross Leasable Area | property 101,105      
Initial cost to the Company, Land $ 11,272,000      
Initial cost to the Company, Building and Improvements 23,395,000      
Subsequent cost capitalized [1] (838,000)      
Gross carrying amount of Land 10,268,000      
Gross carrying amount of building and improvements 23,561,000      
SEC Schedule III, Real Estate, Gross, Total 33,829,000      
Accumulated Depreciation $ 6,266,000      
Carmans Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 182,081      
Initial cost to the Company, Land $ 8,539,000      
Initial cost to the Company, Building and Improvements 35,804,000      
Subsequent cost capitalized [1] 13,051,000      
Gross carrying amount of Land 8,421,000      
Gross carrying amount of building and improvements 48,973,000      
SEC Schedule III, Real Estate, Gross, Total 57,394,000      
Accumulated Depreciation $ 19,451,000      
Carmans Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1954      
Carmans Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2007      
Christina Crossing [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2017      
Percent Owned 100.00%      
Year built/Year last renovated 2008      
Gross Leasable Area | property 119,446      
Initial cost to the Company, Land $ 4,341,000      
Initial cost to the Company, Building and Improvements 23,227,000      
Subsequent cost capitalized [1] 1,716,000      
Gross carrying amount of Land 4,341,000      
Gross carrying amount of building and improvements 24,943,000      
SEC Schedule III, Real Estate, Gross, Total 29,284,000      
Accumulated Depreciation $ 4,558,000      
Coliseum Marketplace [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 106,648      
Initial cost to the Company, Land $ 2,924,000      
Initial cost to the Company, Building and Improvements 14,416,000      
Subsequent cost capitalized [1] (3,050,000)      
Gross carrying amount of Land 3,586,000      
Gross carrying amount of building and improvements 10,704,000      
SEC Schedule III, Real Estate, Gross, Total 14,290,000      
Accumulated Depreciation $ 8,916,000      
Coliseum Marketplace [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1987      
Coliseum Marketplace [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2012      
Colonial Commons [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2011      
Percent Owned 100.00%      
Gross Leasable Area | property 410,432      
Initial cost to the Company, Land $ 9,367,000      
Initial cost to the Company, Building and Improvements 37,496,000      
Subsequent cost capitalized [1] 8,026,000      
Gross carrying amount of Land 9,367,000      
Gross carrying amount of building and improvements 45,522,000      
SEC Schedule III, Real Estate, Gross, Total 54,889,000      
Accumulated Depreciation $ 17,944,000      
Colonial Commons [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2011      
Colonial Commons [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2013      
Crossroads II [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2008      
Percent Owned 60.00%      
Year built/Year last renovated 2009      
Gross Leasable Area | property 133,717      
Initial cost to the Company, Land $ 15,383,000      
Subsequent cost capitalized [1] 29,794,000      
Gross carrying amount of Land 17,671,000      
Gross carrying amount of building and improvements 27,506,000      
SEC Schedule III, Real Estate, Gross, Total 45,177,000      
Accumulated Depreciation $ 8,909,000      
Elmhurst Square [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2006      
Percent Owned 100.00%      
Gross Leasable Area | property 66,254      
Initial cost to the Company, Land $ 1,371,000      
Initial cost to the Company, Building and Improvements 5,994,000      
Subsequent cost capitalized [1] 1,299,000      
Gross carrying amount of Land 1,371,000      
Gross carrying amount of building and improvements 7,293,000      
SEC Schedule III, Real Estate, Gross, Total 8,664,000      
Accumulated Depreciation $ 2,922,000      
Elmhurst Square [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1961      
Elmhurst Square [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1983      
Fairview Commons [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 52,964      
Initial cost to the Company, Land $ 858,000      
Initial cost to the Company, Building and Improvements 3,568,000      
Subsequent cost capitalized [1] 461,000      
Gross carrying amount of Land 858,000      
Gross carrying amount of building and improvements 4,029,000      
SEC Schedule III, Real Estate, Gross, Total 4,887,000      
Accumulated Depreciation $ 1,637,000      
Fairview Commons [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1976      
Fairview Commons [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2003      
Fieldstone Marketplace [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Percent Owned 100.00%      
Gross Leasable Area | property 150,123      
Initial cost to the Company, Land $ 5,229,000      
Initial cost to the Company, Building and Improvements 21,440,000      
Subsequent cost capitalized [1] (3,367,000)      
Gross carrying amount of Land 5,167,000      
Gross carrying amount of building and improvements 18,135,000      
SEC Schedule III, Real Estate, Gross, Total 23,302,000      
Accumulated Depreciation $ 11,607,000      
Fieldstone Marketplace [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Year built/Year last renovated 1988      
Fieldstone Marketplace [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2012      
Year built/Year last renovated 2003      
Fishtown Crossing [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2001      
Percent Owned 100.00%      
Year built/Year last renovated 1988      
Gross Leasable Area | property 131,043      
Initial cost to the Company, Land $ 2,942,000      
Initial cost to the Company, Building and Improvements 11,769,000      
Subsequent cost capitalized [1] 13,892,000      
Gross carrying amount of Land 2,843,000      
Gross carrying amount of building and improvements 25,760,000      
SEC Schedule III, Real Estate, Gross, Total 28,603,000      
Accumulated Depreciation $ 5,919,000      
Frankin Village Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Percent Owned [3] 100.00%      
Gross Leasable Area | property [3] 305,937      
Initial cost to the Company, Land [3] $ 14,270,000      
Initial cost to the Company, Building and Improvements [3] 61,915,000      
Subsequent cost capitalized [1],[3] 6,998,000      
Gross carrying amount of Land [3] 14,681,000      
Gross carrying amount of building and improvements [3] 68,502,000      
SEC Schedule III, Real Estate, Gross, Total [3] 83,183,000      
Accumulated Depreciation [3] $ 21,479,000      
Frankin Village Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired [3] 2004      
Year built/Year last renovated [3] 1987      
Frankin Village Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired [3] 2012      
Year built/Year last renovated [3] 2005      
General Booth Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Year built/Year last renovated 1985      
Gross Leasable Area | property 71,639      
Initial cost to the Company, Land $ 1,935,000      
Initial cost to the Company, Building and Improvements 9,493,000      
Subsequent cost capitalized [1] (109,000)      
Gross carrying amount of Land 1,935,000      
Gross carrying amount of building and improvements 9,384,000      
SEC Schedule III, Real Estate, Gross, Total 11,319,000      
Accumulated Depreciation $ 3,819,000      
Girard Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2019      
Percent Owned 100.00%      
Gross Leasable Area | property 35,688      
Initial cost to the Company, Land $ 4,685,000      
Initial cost to the Company, Building and Improvements 4,648,000      
Subsequent cost capitalized [1] (2,989,000)      
Gross carrying amount of Land 4,685,000      
Gross carrying amount of building and improvements 1,659,000      
SEC Schedule III, Real Estate, Gross, Total 6,344,000      
Accumulated Depreciation $ 649,000      
Girard Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1950      
Girard Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2010      
Gold Star Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2006      
Percent Owned 100.00%      
Year built/Year last renovated 1988      
Gross Leasable Area | property 71,720      
Initial cost to the Company, Land $ 1,644,000      
Initial cost to the Company, Building and Improvements 6,519,000      
Subsequent cost capitalized [1] 802,000      
Gross carrying amount of Land 1,644,000      
Gross carrying amount of building and improvements 7,321,000      
SEC Schedule III, Real Estate, Gross, Total 8,965,000      
Accumulated Depreciation $ 3,596,000      
Golden Triangle [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 202,790      
Initial cost to the Company, Land $ 2,320,000      
Initial cost to the Company, Building and Improvements 9,713,000      
Subsequent cost capitalized [1] 12,672,000      
Gross carrying amount of Land 2,320,000      
Gross carrying amount of building and improvements 22,385,000      
SEC Schedule III, Real Estate, Gross, Total 24,705,000      
Accumulated Depreciation $ 10,926,000      
Golden Triangle [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1960      
Golden Triangle [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2005      
Groton Shopping Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Year built/Year last renovated 1969      
Gross Leasable Area | property 130,264      
Initial cost to the Company, Land $ 3,070,000      
Initial cost to the Company, Building and Improvements 12,320,000      
Subsequent cost capitalized [1] 8,567,000      
Gross carrying amount of Land 3,113,000      
Gross carrying amount of building and improvements 20,844,000      
SEC Schedule III, Real Estate, Gross, Total 23,957,000      
Accumulated Depreciation $ 7,142,000      
Halifax Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Year built/Year last renovated 1994      
Gross Leasable Area | property 51,510      
Initial cost to the Company, Land $ 1,412,000      
Initial cost to the Company, Building and Improvements 5,799,000      
Subsequent cost capitalized [1] 562,000      
Gross carrying amount of Land 1,347,000      
Gross carrying amount of building and improvements 6,426,000      
SEC Schedule III, Real Estate, Gross, Total 7,773,000      
Accumulated Depreciation $ 3,216,000      
Hamburg Square [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2004      
Percent Owned 100.00%      
Gross Leasable Area | property 102,058      
Initial cost to the Company, Land $ 1,153,000      
Initial cost to the Company, Building and Improvements 4,678,000      
Subsequent cost capitalized [1] 6,332,000      
Gross carrying amount of Land 1,153,000      
Gross carrying amount of building and improvements 11,010,000      
SEC Schedule III, Real Estate, Gross, Total 12,163,000      
Accumulated Depreciation $ 4,560,000      
Hamburg Square [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1993      
Hamburg Square [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2010      
Jordan Lane [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 174,679      
Initial cost to the Company, Land $ 4,291,000      
Initial cost to the Company, Building and Improvements 21,176,000      
Subsequent cost capitalized [1] 1,537,000      
Gross carrying amount of Land 4,291,000      
Gross carrying amount of building and improvements 22,713,000      
SEC Schedule III, Real Estate, Gross, Total 27,004,000      
Accumulated Depreciation $ 9,346,000      
Jordan Lane [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1969      
Jordan Lane [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1991      
Kempsville Crossing [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 79,512      
Initial cost to the Company, Land $ 2,207,000      
Initial cost to the Company, Building and Improvements 11,000,000      
Subsequent cost capitalized [1] (2,837,000)      
Gross carrying amount of Land 2,038,000      
Gross carrying amount of building and improvements 8,332,000      
SEC Schedule III, Real Estate, Gross, Total 10,370,000      
Accumulated Depreciation $ 3,664,000      
Kempsville Crossing [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1985      
Kempsville Crossing [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2013      
Kings Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 168,243      
Initial cost to the Company, Land $ 2,413,000      
Initial cost to the Company, Building and Improvements 12,604,000      
Subsequent cost capitalized [1] 1,933,000      
Gross carrying amount of Land 2,408,000      
Gross carrying amount of building and improvements 14,542,000      
SEC Schedule III, Real Estate, Gross, Total 16,950,000      
Accumulated Depreciation $ 4,971,000      
Kings Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1970      
Kings Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1994      
Lawndale Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2015      
Percent Owned 100.00%      
Year built/Year last renovated 1998      
Gross Leasable Area | property 92,773      
Initial cost to the Company, Land $ 3,635,000      
Initial cost to the Company, Building and Improvements 21,854,000      
Subsequent cost capitalized [1] 1,092,000      
Gross carrying amount of Land 3,635,000      
Gross carrying amount of building and improvements 22,946,000      
SEC Schedule III, Real Estate, Gross, Total 26,581,000      
Accumulated Depreciation $ 5,442,000      
Meadows Marketplace [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Percent Owned 100.00%      
Year built/Year last renovated 2005      
Gross Leasable Area | property 91,518      
Initial cost to the Company, Land $ 1,914,000      
Subsequent cost capitalized [1] 11,978,000      
Gross carrying amount of Land 1,914,000      
Gross carrying amount of building and improvements 11,978,000      
SEC Schedule III, Real Estate, Gross, Total 13,892,000      
Accumulated Depreciation $ 4,651,000      
Meadows Marketplace [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2004      
Meadows Marketplace [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2012      
Newport Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Year built/Year last renovated 1996      
Gross Leasable Area | property 64,489      
Initial cost to the Company, Land $ 1,721,000      
Initial cost to the Company, Building and Improvements 7,758,000      
Subsequent cost capitalized [1] 587,000      
Gross carrying amount of Land 1,682,000      
Gross carrying amount of building and improvements 8,384,000      
SEC Schedule III, Real Estate, Gross, Total 10,066,000      
Accumulated Depreciation $ 4,183,000      
New London Mall [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2009      
Percent Owned 100.00%      
Gross Leasable Area | property 259,566      
Initial cost to the Company, Land $ 14,891,000      
Initial cost to the Company, Building and Improvements 24,967,000      
Subsequent cost capitalized [1] 5,022,000      
Gross carrying amount of Land 8,807,000      
Gross carrying amount of building and improvements 36,073,000      
SEC Schedule III, Real Estate, Gross, Total 44,880,000      
Accumulated Depreciation $ 16,240,000      
New London Mall [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1967      
New London Mall [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1997      
Northside Commons [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2008      
Percent Owned 100.00%      
Year built/Year last renovated 2009      
Gross Leasable Area | property 69,136      
Initial cost to the Company, Land $ 3,332,000      
Subsequent cost capitalized [1] 9,390,000      
Gross carrying amount of Land 3,379,000      
Gross carrying amount of building and improvements 9,343,000      
SEC Schedule III, Real Estate, Gross, Total 12,722,000      
Accumulated Depreciation $ 3,124,000      
Norwood Shopping Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2006      
Percent Owned 100.00%      
Gross Leasable Area | property 42,308      
Initial cost to the Company, Land $ 1,874,000      
Initial cost to the Company, Building and Improvements 8,453,000      
Subsequent cost capitalized [1] 5,128,000      
Gross carrying amount of Land 1,874,000      
Gross carrying amount of building and improvements 13,581,000      
SEC Schedule III, Real Estate, Gross, Total 15,455,000      
Accumulated Depreciation $ 4,754,000      
Norwood Shopping Center [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1965      
Norwood Shopping Center [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2013      
Oak Ridge Shopping Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2006      
Percent Owned 100.00%      
Year built/Year last renovated 2000      
Gross Leasable Area | property 38,700      
Initial cost to the Company, Land $ 960,000      
Initial cost to the Company, Building and Improvements 4,254,000      
Subsequent cost capitalized [1] 478,000      
Gross carrying amount of Land 960,000      
Gross carrying amount of building and improvements 4,732,000      
SEC Schedule III, Real Estate, Gross, Total 5,692,000      
Accumulated Depreciation $ 2,016,000      
Oakland Commons [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 90,100      
Initial cost to the Company, Land $ 2,504,000      
Initial cost to the Company, Building and Improvements 15,662,000      
Subsequent cost capitalized [1] (3,466,000)      
Gross carrying amount of Land 2,504,000      
Gross carrying amount of building and improvements 12,196,000      
SEC Schedule III, Real Estate, Gross, Total 14,700,000      
Accumulated Depreciation $ 6,273,000      
Oakland Commons [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1962      
Oakland Commons [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2013      
Oakland Mills [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 57,008      
Initial cost to the Company, Land $ 1,611,000      
Initial cost to the Company, Building and Improvements 6,292,000      
Subsequent cost capitalized [1] 1,145,000      
Gross carrying amount of Land 1,530,000      
Gross carrying amount of building and improvements 7,518,000      
SEC Schedule III, Real Estate, Gross, Total 9,048,000      
Accumulated Depreciation $ 3,311,000      
Oakland Mills [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1960      
Oakland Mills [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2004      
Palmyra Shopping Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 111,051      
Initial cost to the Company, Land $ 1,488,000      
Initial cost to the Company, Building and Improvements 6,566,000      
Subsequent cost capitalized [1] 2,156,000      
Gross carrying amount of Land 1,488,000      
Gross carrying amount of building and improvements 8,722,000      
SEC Schedule III, Real Estate, Gross, Total 10,210,000      
Accumulated Depreciation $ 4,008,000      
Palmyra Shopping Center [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1960      
Palmyra Shopping Center [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2012      
Pine Grove Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 79,306      
Initial cost to the Company, Land $ 2,010,000      
Initial cost to the Company, Building and Improvements 6,489,000      
Subsequent cost capitalized [1] 612,000      
Gross carrying amount of Land 1,622,000      
Gross carrying amount of building and improvements 7,489,000      
SEC Schedule III, Real Estate, Gross, Total 9,111,000      
Accumulated Depreciation $ 3,618,000      
Pine Grove Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2001      
Pine Grove Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2002      
Quartermaster Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2014      
Percent Owned 100.00%      
Year built/Year last renovated 2004      
Gross Leasable Area | property 456,154      
Initial cost to the Company, Land $ 37,031,000      
Initial cost to the Company, Building and Improvements 54,210,000      
Subsequent cost capitalized [1] 3,721,000      
Gross carrying amount of Land 37,031,000      
Gross carrying amount of building and improvements 57,931,000      
SEC Schedule III, Real Estate, Gross, Total 94,962,000      
Accumulated Depreciation $ 14,798,000      
San Souci Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2009      
Percent Owned 100.00%      
Gross Leasable Area | property 264,134      
Initial cost to the Company, Land $ 14,849,000      
Initial cost to the Company, Building and Improvements 18,445,000      
Subsequent cost capitalized [1] 5,195,000      
Gross carrying amount of Land 13,211,000      
Gross carrying amount of building and improvements 25,278,000      
SEC Schedule III, Real Estate, Gross, Total 38,489,000      
Accumulated Depreciation $ 13,905,000      
San Souci Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1985      
San Souci Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1997      
Shoppes at Arts District [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2016      
Percent Owned 100.00%      
Year built/Year last renovated 2011      
Gross Leasable Area | property 35,676      
Initial cost to the Company, Land $ 2,247,000      
Initial cost to the Company, Building and Improvements 18,616,000      
Subsequent cost capitalized [1] 91,000      
Gross carrying amount of Land 2,247,000      
Gross carrying amount of building and improvements 18,707,000      
SEC Schedule III, Real Estate, Gross, Total 20,954,000      
Accumulated Depreciation $ 3,924,000      
South Philadelphia [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 191,340      
Initial cost to the Company, Land $ 8,222,000      
Initial cost to the Company, Building and Improvements 36,314,000      
Subsequent cost capitalized [1] (3,839,000)      
Gross carrying amount of Land 10,363,000      
Gross carrying amount of building and improvements 30,334,000      
SEC Schedule III, Real Estate, Gross, Total 40,697,000      
Accumulated Depreciation $ 24,206,000      
South Philadelphia [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1950      
South Philadelphia [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2003      
Southington Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 155,842      
Initial cost to the Company, Building and Improvements $ 11,834,000      
Subsequent cost capitalized [1] 1,456,000      
Gross carrying amount of building and improvements 13,290,000      
SEC Schedule III, Real Estate, Gross, Total 13,290,000      
Accumulated Depreciation $ 5,822,000      
Southington Center [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1972      
Southington Center [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2000      
Swede Square [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 100,809      
Initial cost to the Company, Land $ 2,268,000      
Initial cost to the Company, Building and Improvements 6,232,000      
Subsequent cost capitalized [1] 8,739,000      
Gross carrying amount of Land 2,272,000      
Gross carrying amount of building and improvements 14,967,000      
SEC Schedule III, Real Estate, Gross, Total 17,239,000      
Accumulated Depreciation $ 6,787,000      
Swede Square [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1980      
Swede Square [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2012      
The Brickyard [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2004      
Percent Owned 100.00%      
Gross Leasable Area | property 227,598      
Initial cost to the Company, Land $ 7,632,000      
Initial cost to the Company, Building and Improvements 29,308,000      
Subsequent cost capitalized [1] 576,000      
Gross carrying amount of Land 7,648,000      
Gross carrying amount of building and improvements 29,868,000      
SEC Schedule III, Real Estate, Gross, Total 37,516,000      
Accumulated Depreciation $ 13,955,000      
The Brickyard [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1990      
The Brickyard [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2012      
The Point [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2000      
Percent Owned 100.00%      
Gross Leasable Area | property 260,625      
Initial cost to the Company, Land $ 2,700,000      
Initial cost to the Company, Building and Improvements 10,800,000      
Subsequent cost capitalized [1] 20,418,000      
Gross carrying amount of Land 2,996,000      
Gross carrying amount of building and improvements 30,922,000      
SEC Schedule III, Real Estate, Gross, Total 33,918,000      
Accumulated Depreciation $ 14,490,000      
The Point [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1972      
The Point [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2012      
The Shops at Bloomfield Station [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2016      
Percent Owned 100.00%      
Year built/Year last renovated 2015      
Gross Leasable Area | property 63,844      
Initial cost to the Company, Land $ 625,000      
Initial cost to the Company, Building and Improvements 17,674,000      
Subsequent cost capitalized [1] (3,820,000)      
Gross carrying amount of Land 625,000      
Gross carrying amount of building and improvements 13,854,000      
SEC Schedule III, Real Estate, Gross, Total 14,479,000      
Accumulated Depreciation $ 3,756,000      
Shops at Suffolk Downs [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 121,187      
Initial cost to the Company, Land $ 7,580,000      
Initial cost to the Company, Building and Improvements 11,089,000      
Subsequent cost capitalized [1] 10,633,000      
Gross carrying amount of Land 7,580,000      
Gross carrying amount of building and improvements 21,722,000      
SEC Schedule III, Real Estate, Gross, Total 29,302,000      
Accumulated Depreciation $ 8,599,000      
Shops at Suffolk Downs [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2005      
Shops at Suffolk Downs [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2011      
Timpany Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 182,799      
Initial cost to the Company, Land $ 3,412,000      
Initial cost to the Company, Building and Improvements 19,240,000      
Subsequent cost capitalized [1] (4,879,000)      
Gross carrying amount of Land 3,368,000      
Gross carrying amount of building and improvements 14,405,000      
SEC Schedule III, Real Estate, Gross, Total 17,773,000      
Accumulated Depreciation $ 7,651,000      
Timpany Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1970      
Timpany Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1989      
Trexler Mall [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 336,687      
Initial cost to the Company, Land $ 6,932,000      
Initial cost to the Company, Building and Improvements 32,815,000      
Subsequent cost capitalized [1] 13,874,000      
Gross carrying amount of Land 6,932,000      
Gross carrying amount of building and improvements 46,689,000      
SEC Schedule III, Real Estate, Gross, Total 53,621,000      
Accumulated Depreciation $ 18,349,000      
Trexler Mall [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1973      
Trexler Mall [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2013      
Trexlertown Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2006      
Percent Owned 100.00%      
Gross Leasable Area | property 325,171      
Initial cost to the Company, Land $ 13,349,000      
Initial cost to the Company, Building and Improvements 23,867,000      
Subsequent cost capitalized [1] 31,090,000      
Gross carrying amount of Land 15,674,000      
Gross carrying amount of building and improvements 52,632,000      
SEC Schedule III, Real Estate, Gross, Total 68,306,000      
Accumulated Depreciation $ 16,527,000      
Trexlertown Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1990      
Trexlertown Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2011      
Valley Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 190,939      
Initial cost to the Company, Land $ 1,950,000      
Initial cost to the Company, Building and Improvements 7,766,000      
Subsequent cost capitalized [1] 5,370,000      
Gross carrying amount of Land 1,950,000      
Gross carrying amount of building and improvements 13,136,000      
SEC Schedule III, Real Estate, Gross, Total 15,086,000      
Accumulated Depreciation $ 4,689,000      
Valley Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1975      
Valley Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1994      
Washington Centers Shoppes [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2001      
Percent Owned 100.00%      
Gross Leasable Area | property 157,300      
Initial cost to the Company, Land $ 2,061,000      
Initial cost to the Company, Building and Improvements 7,314,000      
Subsequent cost capitalized [1] 7,159,000      
Gross carrying amount of Land 2,000,000      
Gross carrying amount of building and improvements 14,534,000      
SEC Schedule III, Real Estate, Gross, Total 16,534,000      
Accumulated Depreciation $ 6,767,000      
Washington Centers Shoppes [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1979      
Washington Centers Shoppes [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1995      
Webster Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 98,984      
Initial cost to the Company, Land $ 3,551,000      
Initial cost to the Company, Building and Improvements 18,412,000      
Subsequent cost capitalized [1] (1,656,000)      
Gross carrying amount of Land 4,082,000      
Gross carrying amount of building and improvements 16,225,000      
SEC Schedule III, Real Estate, Gross, Total 20,307,000      
Accumulated Depreciation $ 8,001,000      
Webster Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1960      
Webster Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2004      
Yorktowne Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 136,197      
Initial cost to the Company, Land $ 5,940,000      
Initial cost to the Company, Building and Improvements 25,505,000      
Subsequent cost capitalized [1] (2,562,000)      
Gross carrying amount of Land 5,801,000      
Gross carrying amount of building and improvements 23,082,000      
SEC Schedule III, Real Estate, Gross, Total 28,883,000      
Accumulated Depreciation $ 10,734,000      
Yorktowne Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1970      
Yorktowne Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2000      
Other [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Percent Owned 100.00%      
Initial cost to the Company, Land $ 1,965,000      
Subsequent cost capitalized [1] 1,443,000      
Gross carrying amount of Land 879,000      
Gross carrying amount of building and improvements 2,529,000      
SEC Schedule III, Real Estate, Gross, Total 3,408,000      
Accumulated Depreciation $ 490,000      
[1]

Negative amounts represent write-offs of fully depreciated assets and impairments.
[2] At December 31, 2021, the aggregate cost for federal income tax purposes was approximately $34.5 million greater than the Company's recorded values.
[3]

Amount of encumbrance totals $164.2 million at December 31, 2021.