SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION Schedule of Real Estate and Accumulated Depreciation (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	727,048,000
Initial Cost to Company of Land	332,621,000
Initial Cost to Company of Buildings and Improvements	638,763,000
Costs Capitalized Subsequent to Acquisition	524,358,000
Carrying Amount of Land	339,349,000
Carrying Amount of Buildings and Improvements	1,156,393,000
Total Carrying Amount	1,495,742,000
Accumulated Depreciation	187,029,000
Real Estate, Federal Income Tax Basis	1,347,000,000
Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	30 years
Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	40 years
Core Portfolio [Member] | Crescent Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	17,025,000
Initial Cost to Company of Land	1,147,000
Initial Cost to Company of Buildings and Improvements	7,425,000
Costs Capitalized Subsequent to Acquisition	1,335,000
Carrying Amount of Land	1,147,000
Carrying Amount of Buildings and Improvements	8,760,000
Total Carrying Amount	9,907,000
Accumulated Depreciation	6,385,000
Real Estate and Accumulated Depreciation, Date Acquired	May 01, 1993
Core Portfolio [Member] | New Louden Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	13,634,000
Initial Cost to Company of Land	505,000
Initial Cost to Company of Buildings and Improvements	4,161,000
Costs Capitalized Subsequent to Acquisition	12,518,000
Carrying Amount of Land	505,000
Carrying Amount of Buildings and Improvements	16,679,000
Total Carrying Amount	17,184,000
Accumulated Depreciation	12,231,000
Real Estate and Accumulated Depreciation, Date Acquired	May 01, 1993
Core Portfolio [Member] | Mark Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	0
Initial Cost to Company of Buildings and Improvements	4,268,000
Costs Capitalized Subsequent to Acquisition	(872,000)
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	3,396,000
Total Carrying Amount	3,396,000
Accumulated Depreciation	2,663,000
Real Estate and Accumulated Depreciation, Date of Construction	May 01, 1993
Core Portfolio [Member] | Plaza 422 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	190,000
Initial Cost to Company of Buildings and Improvements	3,004,000
Costs Capitalized Subsequent to Acquisition	2,301,000
Carrying Amount of Land	190,000
Carrying Amount of Buildings and Improvements	5,305,000
Total Carrying Amount	5,495,000
Accumulated Depreciation	4,336,000
Real Estate and Accumulated Depreciation, Date of Construction	May 01, 1993
Core Portfolio [Member] | Route 6 Mall [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	1,664,000
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	11,422,000
Carrying Amount of Land	1,664,000
Carrying Amount of Buildings and Improvements	11,422,000
Total Carrying Amount	13,086,000
Accumulated Depreciation	6,746,000
Real Estate and Accumulated Depreciation, Date of Construction	May 11, 1994
Core Portfolio [Member] | Bartow Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	1,691,000
Initial Cost to Company of Buildings and Improvements	5,803,000
Costs Capitalized Subsequent to Acquisition	560,000
Carrying Amount of Land	1,691,000
Carrying Amount of Buildings and Improvements	6,363,000
Total Carrying Amount	8,054,000
Accumulated Depreciation	1,919,000
Real Estate and Accumulated Depreciation, Date of Construction	Jul. 01, 2005
Core Portfolio [Member] | Amboy Rd. Shopping Ctr. [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	0
Initial Cost to Company of Buildings and Improvements	11,909,000
Costs Capitalized Subsequent to Acquisition	2,035,000
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	13,944,000
Total Carrying Amount	13,944,000
Accumulated Depreciation	2,813,000
Real Estate and Accumulated Depreciation, Date Acquired	Jul. 07, 2005
Core Portfolio [Member] | Abington Towne Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	799,000
Initial Cost to Company of Buildings and Improvements	3,197,000
Costs Capitalized Subsequent to Acquisition	2,007,000
Carrying Amount of Land	799,000
Carrying Amount of Buildings and Improvements	5,204,000
Total Carrying Amount	6,003,000
Accumulated Depreciation	2,704,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Bloomfield Town Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	3,207,000
Initial Cost to Company of Buildings and Improvements	13,774,000
Costs Capitalized Subsequent to Acquisition	20,420,000
Carrying Amount of Land	3,207,000
Carrying Amount of Buildings and Improvements	34,194,000
Total Carrying Amount	37,401,000
Accumulated Depreciation	11,867,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Walnut Hill Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	23,194,000
Initial Cost to Company of Land	3,122,000
Initial Cost to Company of Buildings and Improvements	12,488,000
Costs Capitalized Subsequent to Acquisition	1,941,000
Carrying Amount of Land	3,122,000
Carrying Amount of Buildings and Improvements	14,429,000
Total Carrying Amount	17,551,000
Accumulated Depreciation	5,804,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Elmwood Park Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	33,258,000
Initial Cost to Company of Land	3,248,000
Initial Cost to Company of Buildings and Improvements	12,992,000
Costs Capitalized Subsequent to Acquisition	15,401,000
Carrying Amount of Land	3,798,000
Carrying Amount of Buildings and Improvements	27,843,000
Total Carrying Amount	31,641,000
Accumulated Depreciation	13,235,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Merrillville Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	26,151,000
Initial Cost to Company of Land	4,288,000
Initial Cost to Company of Buildings and Improvements	17,152,000
Costs Capitalized Subsequent to Acquisition	2,677,000
Carrying Amount of Land	4,288,000
Carrying Amount of Buildings and Improvements	19,829,000
Total Carrying Amount	24,117,000
Accumulated Depreciation	7,797,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Marketplace of Absecon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	2,573,000
Initial Cost to Company of Buildings and Improvements	10,294,000
Costs Capitalized Subsequent to Acquisition	3,799,000
Carrying Amount of Land	2,577,000
Carrying Amount of Buildings and Improvements	14,089,000
Total Carrying Amount	16,666,000
Accumulated Depreciation	5,574,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Clark Diversey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	4,345,000
Initial Cost to Company of Land	10,061,000
Initial Cost to Company of Buildings and Improvements	2,773,000
Costs Capitalized Subsequent to Acquisition	246,000
Carrying Amount of Land	10,061,000
Carrying Amount of Buildings and Improvements	3,019,000
Total Carrying Amount	13,080,000
Accumulated Depreciation	553,000
Real Estate and Accumulated Depreciation, Date Acquired	Jan. 12, 2006
Core Portfolio [Member] | Boonton [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,967,000
Initial Cost to Company of Land	1,328,000
Initial Cost to Company of Buildings and Improvements	7,188,000
Costs Capitalized Subsequent to Acquisition	399,000
Carrying Amount of Land	1,328,000
Carrying Amount of Buildings and Improvements	7,587,000
Total Carrying Amount	8,915,000
Accumulated Depreciation	1,297,000
Real Estate and Accumulated Depreciation, Date Acquired	Jan. 24, 2006
Core Portfolio [Member] | Chestnut Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	8,289,000
Initial Cost to Company of Buildings and Improvements	5,691,000
Costs Capitalized Subsequent to Acquisition	3,577,000
Carrying Amount of Land	8,289,000
Carrying Amount of Buildings and Improvements	9,268,000
Total Carrying Amount	17,557,000
Accumulated Depreciation	1,169,000
Real Estate and Accumulated Depreciation, Date Acquired	Jun. 16, 2006
Core Portfolio [Member] | Third Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	11,108,000
Initial Cost to Company of Buildings and Improvements	8,038,000
Costs Capitalized Subsequent to Acquisition	4,288,000
Carrying Amount of Land	11,855,000
Carrying Amount of Buildings and Improvements	11,579,000
Total Carrying Amount	23,434,000
Accumulated Depreciation	1,252,000
Real Estate and Accumulated Depreciation, Date Acquired	Sep. 21, 2006
Core Portfolio [Member] | Hobson West Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	1,793,000
Initial Cost to Company of Buildings and Improvements	7,172,000
Costs Capitalized Subsequent to Acquisition	1,771,000
Carrying Amount of Land	1,793,000
Carrying Amount of Buildings and Improvements	8,943,000
Total Carrying Amount	10,736,000
Accumulated Depreciation	3,638,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Village Commons Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,192,000
Initial Cost to Company of Land	3,229,000
Initial Cost to Company of Buildings and Improvements	12,917,000
Costs Capitalized Subsequent to Acquisition	3,934,000
Carrying Amount of Land	3,229,000
Carrying Amount of Buildings and Improvements	16,851,000
Total Carrying Amount	20,080,000
Accumulated Depreciation	6,691,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Town Line Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	878,000
Initial Cost to Company of Buildings and Improvements	3,510,000
Costs Capitalized Subsequent to Acquisition	7,508,000
Carrying Amount of Land	907,000
Carrying Amount of Buildings and Improvements	10,989,000
Total Carrying Amount	11,896,000
Accumulated Depreciation	8,207,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | Branch Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	12,526,000
Initial Cost to Company of Land	3,156,000
Initial Cost to Company of Buildings and Improvements	12,545,000
Costs Capitalized Subsequent to Acquisition	7,181,000
Carrying Amount of Land	3,401,000
Carrying Amount of Buildings and Improvements	19,481,000
Total Carrying Amount	22,882,000
Accumulated Depreciation	5,299,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | The Methuen Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	956,000
Initial Cost to Company of Buildings and Improvements	3,826,000
Costs Capitalized Subsequent to Acquisition	594,000
Carrying Amount of Land	961,000
Carrying Amount of Buildings and Improvements	4,415,000
Total Carrying Amount	5,376,000
Accumulated Depreciation	1,811,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 12, 1998
Core Portfolio [Member] | The Gateway Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	20,036,000
Initial Cost to Company of Land	1,273,000
Initial Cost to Company of Buildings and Improvements	5,091,000
Costs Capitalized Subsequent to Acquisition	12,230,000
Carrying Amount of Land	1,273,000
Carrying Amount of Buildings and Improvements	17,321,000
Total Carrying Amount	18,594,000
Accumulated Depreciation	6,257,000
Real Estate and Accumulated Depreciation, Date Acquired	May 05, 1999
Core Portfolio [Member] | River Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	4,197,000
Initial Cost to Company of Land	3,510,000
Initial Cost to Company of Buildings and Improvements	2,886,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	3,510,000
Carrying Amount of Buildings and Improvements	2,886,000
Total Carrying Amount	6,396,000
Accumulated Depreciation	77,000
Real Estate and Accumulated Depreciation, Date Acquired	Feb. 10, 2012
Core Portfolio [Member] | Rhode Island Place Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	16,426,000
Initial Cost to Company of Land	4,340,000
Initial Cost to Company of Buildings and Improvements	17,360,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	4,340,000
Carrying Amount of Buildings and Improvements	17,360,000
Total Carrying Amount	21,700,000
Accumulated Depreciation	217,000
Real Estate and Accumulated Depreciation, Date Acquired	Jun. 28, 2012
Core Portfolio [Member] | Mad River Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	2,350,000
Initial Cost to Company of Buildings and Improvements	9,404,000
Costs Capitalized Subsequent to Acquisition	1,058,000
Carrying Amount of Land	2,350,000
Carrying Amount of Buildings and Improvements	10,462,000
Total Carrying Amount	12,812,000
Accumulated Depreciation	3,926,000
Real Estate and Accumulated Depreciation, Date Acquired	Feb. 25, 1999
Core Portfolio [Member] | Pacesetter Park Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,742,000
Initial Cost to Company of Land	1,475,000
Initial Cost to Company of Buildings and Improvements	5,899,000
Costs Capitalized Subsequent to Acquisition	2,040,000
Carrying Amount of Land	1,475,000
Carrying Amount of Buildings and Improvements	7,939,000
Total Carrying Amount	9,414,000
Accumulated Depreciation	3,023,000
Real Estate and Accumulated Depreciation, Date Acquired	Nov. 08, 1999
Core Portfolio [Member] | 239 Greenwich Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	26,000,000
Initial Cost to Company of Land	1,817,000
Initial Cost to Company of Buildings and Improvements	15,846,000
Costs Capitalized Subsequent to Acquisition	549,000
Carrying Amount of Land	1,817,000
Carrying Amount of Buildings and Improvements	16,395,000
Total Carrying Amount	18,212,000
Accumulated Depreciation	5,701,000
Real Estate and Accumulated Depreciation, Date Acquired	Jan. 27, 1998
Core Portfolio [Member] | West Shore Expressway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	3,380,000
Initial Cost to Company of Buildings and Improvements	13,554,000
Costs Capitalized Subsequent to Acquisition	(55,000)
Carrying Amount of Land	3,380,000
Carrying Amount of Buildings and Improvements	13,499,000
Total Carrying Amount	16,879,000
Accumulated Depreciation	2,206,000
Real Estate and Accumulated Depreciation, Date Acquired	Mar. 20, 2007
Core Portfolio [Member] | West 54th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	16,699,000
Initial Cost to Company of Buildings and Improvements	18,704,000
Costs Capitalized Subsequent to Acquisition	74,000
Carrying Amount of Land	16,699,000
Carrying Amount of Buildings and Improvements	18,778,000
Total Carrying Amount	35,477,000
Accumulated Depreciation	2,695,000
Real Estate and Accumulated Depreciation, Date Acquired	Mar. 20, 2007
Core Portfolio [Member] | Acadia 5-7 East 17th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	3,048,000
Initial Cost to Company of Buildings and Improvements	7,281,000
Costs Capitalized Subsequent to Acquisition	40,000
Carrying Amount of Land	3,048,000
Carrying Amount of Buildings and Improvements	7,321,000
Total Carrying Amount	10,369,000
Accumulated Depreciation	945,000
Real Estate and Accumulated Depreciation, Date Acquired	Apr. 22, 2008
Core Portfolio [Member] | West Diversey 651-671 W Diversey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,273,000
Initial Cost to Company of Land	8,576,000
Initial Cost to Company of Buildings and Improvements	17,256,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	8,576,000
Carrying Amount of Buildings and Improvements	17,256,000
Total Carrying Amount	25,832,000
Accumulated Depreciation	683,000
Real Estate and Accumulated Depreciation, Date Acquired	May 25, 2011
Core Portfolio [Member] | Mercer Street 15 Mercer Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	1,887,000
Initial Cost to Company of Buildings and Improvements	2,483,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	1,887,000
Carrying Amount of Buildings and Improvements	2,483,000
Total Carrying Amount	4,370,000
Accumulated Depreciation	93,000
Real Estate and Accumulated Depreciation, Date Acquired	Jun. 30, 2011
Core Portfolio [Member] | 4401 White Plains [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,381,000
Initial Cost to Company of Land	1,581,000
Initial Cost to Company of Buildings and Improvements	5,054,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	1,581,000
Carrying Amount of Buildings and Improvements	5,054,000
Total Carrying Amount	6,635,000
Accumulated Depreciation	168,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 24, 2011
Core Portfolio [Member] | Chicago Street Retail Portfolio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,775,000
Initial Cost to Company of Land	17,816,000
Initial Cost to Company of Buildings and Improvements	56,965,000
Costs Capitalized Subsequent to Acquisition	153,000
Carrying Amount of Land	17,854,000
Carrying Amount of Buildings and Improvements	57,080,000
Total Carrying Amount	74,934,000
Accumulated Depreciation	800,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 09, 2011
Core Portfolio [Member] | 1520 North Milwaukee Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	2,110,000
Initial Cost to Company of Buildings and Improvements	1,306,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	2,110,000
Carrying Amount of Buildings and Improvements	1,306,000
Total Carrying Amount	3,416,000
Accumulated Depreciation	66,000
Real Estate and Accumulated Depreciation, Date Acquired	Jan. 23, 2012
Core Portfolio [Member] | Cambridge LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,528,000
Initial Cost to Company of Land	4,704,000
Initial Cost to Company of Buildings and Improvements	10,208,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	4,704,000
Carrying Amount of Buildings and Improvements	10,208,000
Total Carrying Amount	14,912,000
Accumulated Depreciation	237,000
Real Estate and Accumulated Depreciation, Date Acquired	Feb. 28, 2012
Core Portfolio [Member] | 930 Rush Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	5,175,000
Initial Cost to Company of Buildings and Improvements	15,525,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	5,175,000
Carrying Amount of Buildings and Improvements	15,525,000
Total Carrying Amount	20,700,000
Accumulated Depreciation	291,000
Real Estate and Accumulated Depreciation, Date Acquired	Apr. 06, 2012
Core Portfolio [Member] | 28 Jericho Turnpike [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	6,220,000
Initial Cost to Company of Buildings and Improvements	24,416,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	6,220,000
Carrying Amount of Buildings and Improvements	24,416,000
Total Carrying Amount	30,636,000
Accumulated Depreciation	374,000
Real Estate and Accumulated Depreciation, Date Acquired	May 18, 2012
Core Portfolio [Member] | 181 Main Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	3,539,000
Initial Cost to Company of Buildings and Improvements	10,618,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	3,539,000
Carrying Amount of Buildings and Improvements	10,618,000
Total Carrying Amount	14,157,000
Accumulated Depreciation	22,000
Real Estate and Accumulated Depreciation, Date Acquired	Dec. 03, 2012
Core Portfolio [Member] | 83 Spring Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	1,754,000
Initial Cost to Company of Buildings and Improvements	9,200,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	1,754,000
Carrying Amount of Buildings and Improvements	9,200,000
Total Carrying Amount	10,954,000
Accumulated Depreciation	115,000
Real Estate and Accumulated Depreciation, Date Acquired	Jul. 10, 2012
Core Portfolio [Member] | 60 Orange Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	12,477,000
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	12,477,000
Carrying Amount of Buildings and Improvements	0
Total Carrying Amount	12,477,000
Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired	Oct. 10, 2012
Core Portfolio [Member] | 171-53 and 181-03 Connecticut Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	5,811,000
Initial Cost to Company of Buildings and Improvements	17,433,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	5,811,000
Carrying Amount of Buildings and Improvements	17,433,000
Total Carrying Amount	23,244,000
Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired	Dec. 10, 2012
Core Portfolio [Member] | 639 West Diversey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	4,431,000
Initial Cost to Company of Land	2,672,000
Initial Cost to Company of Buildings and Improvements	8,016,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	2,672,000
Carrying Amount of Buildings and Improvements	8,016,000
Total Carrying Amount	10,688,000
Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired	Dec. 18, 2012
Core Portfolio [Member] | Undeveloped Land [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	250,000
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	250,000
Carrying Amount of Buildings and Improvements	0
Total Carrying Amount	250,000
Fund I [Member] | Kroger/Safeway Various [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	0
Initial Cost to Company of Buildings and Improvements	4,215,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	4,215,000
Total Carrying Amount	4,215,000
Accumulated Depreciation	4,016,000
Real Estate and Accumulated Depreciation, Date Acquired	Jan. 16, 2003
Fund II [Member] | Pelham Manor [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	33,833,000
Initial Cost to Company of Land	0
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	57,001,000
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	57,001,000
Total Carrying Amount	57,001,000
Accumulated Depreciation	6,055,000
Real Estate and Accumulated Depreciation, Date Acquired	Oct. 01, 2004
Fund II [Member] | 400 E Fordham Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	82,205,000
Initial Cost to Company of Land	11,144,000
Initial Cost to Company of Buildings and Improvements	18,010,000
Costs Capitalized Subsequent to Acquisition	102,590,000
Carrying Amount of Land	16,254,000
Carrying Amount of Buildings and Improvements	115,490,000
Total Carrying Amount	131,744,000
Accumulated Depreciation	11,912,000
Real Estate and Accumulated Depreciation, Date Acquired	Sep. 29, 2004
Fund II [Member] | 216th Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	25,500,000
Initial Cost to Company of Land	7,261,000
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	19,197,000
Carrying Amount of Land	7,261,000
Carrying Amount of Buildings and Improvements	19,197,000
Total Carrying Amount	26,458,000
Accumulated Depreciation	3,023,000
Real Estate and Accumulated Depreciation, Date Acquired	Dec. 01, 2005
Fund II [Member] | 161st Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	28,900,000
Initial Cost to Company of Land	16,679,000
Initial Cost to Company of Buildings and Improvements	28,410,000
Costs Capitalized Subsequent to Acquisition	17,355,000
Carrying Amount of Land	16,679,000
Carrying Amount of Buildings and Improvements	45,765,000
Total Carrying Amount	62,444,000
Accumulated Depreciation	6,082,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 05, 2005
Fund III [Member] | Cortlandt Towne Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	73,499,000
Initial Cost to Company of Land	7,293,000
Initial Cost to Company of Buildings and Improvements	61,395,000
Costs Capitalized Subsequent to Acquisition	5,600,000
Carrying Amount of Land	7,293,000
Carrying Amount of Buildings and Improvements	66,995,000
Total Carrying Amount	74,288,000
Accumulated Depreciation	11,833,000
Real Estate and Accumulated Depreciation, Date Acquired	Jan. 29, 2009
Fund III [Member] | Cortland Crossing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	11,000,000
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	11,000,000
Carrying Amount of Buildings and Improvements	0
Total Carrying Amount	11,000,000
Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 13, 2012
Fund III [Member] | Heritage Shops [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	21,000,000
Initial Cost to Company of Land	13,131,000
Initial Cost to Company of Buildings and Improvements	15,409,000
Costs Capitalized Subsequent to Acquisition	54,000
Carrying Amount of Land	13,131,000
Carrying Amount of Buildings and Improvements	15,463,000
Total Carrying Amount	28,594,000
Accumulated Depreciation	923,000
Real Estate and Accumulated Depreciation, Date Acquired	Apr. 07, 2011
Fund III [Member] | 654 Broadway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	9,040,000
Initial Cost to Company of Buildings and Improvements	3,654,000
Costs Capitalized Subsequent to Acquisition	(2,000)
Carrying Amount of Land	9,040,000
Carrying Amount of Buildings and Improvements	3,652,000
Total Carrying Amount	12,692,000
Accumulated Depreciation	99,000
Real Estate and Accumulated Depreciation, Date Acquired	Nov. 30, 2011
Fund III [Member] | Marcus Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,484,000
Initial Cost to Company of Land	3,115,000
Initial Cost to Company of Buildings and Improvements	7,285,000
Costs Capitalized Subsequent to Acquisition	623,000
Carrying Amount of Land	3,115,000
Carrying Amount of Buildings and Improvements	7,908,000
Total Carrying Amount	11,023,000
Accumulated Depreciation	208,000
Real Estate and Accumulated Depreciation, Date Acquired	Dec. 22, 2011
Fund III [Member] | 640 Broadway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	22,750,000
Initial Cost to Company of Land	12,503,000
Initial Cost to Company of Buildings and Improvements	19,960,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	12,503,000
Carrying Amount of Buildings and Improvements	19,960,000
Total Carrying Amount	32,463,000
Accumulated Depreciation	487,000
Real Estate and Accumulated Depreciation, Date Acquired	Feb. 07, 2012
Fund III [Member] | Lincoln Park Centre LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	19,834,000
Initial Cost to Company of Land	5,090,000
Initial Cost to Company of Buildings and Improvements	25,353,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	5,090,000
Carrying Amount of Buildings and Improvements	25,353,000
Total Carrying Amount	30,443,000
Accumulated Depreciation	481,000
Real Estate and Accumulated Depreciation, Date Acquired	Apr. 02, 2012
Fund III [Member] | 3104 M Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	750,000
Initial Cost to Company of Buildings and Improvements	2,251,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	750,000
Carrying Amount of Buildings and Improvements	2,251,000
Total Carrying Amount	3,001,000
Accumulated Depreciation	23,000
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 08, 2012
Fund III [Member] | Broad Hollow Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	12,386,000
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	12,386,000
Carrying Amount of Buildings and Improvements	0
Total Carrying Amount	12,386,000
Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired	Aug. 29, 2012
Fund IV [Member] | 210 Bowery LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	1,875,000
Initial Cost to Company of Buildings and Improvements	5,625,000
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	1,875,000
Carrying Amount of Buildings and Improvements	5,625,000
Total Carrying Amount	7,500,000
Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Date Acquired	Dec. 18, 2012
Fund IV [Member] | Acadia Strategic Opportunity Fund IV [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	93,050,000
Initial Cost to Company of Land	0
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	0
Total Carrying Amount	0
Accumulated Depreciation	0
Fund IV [Member] | Real Estate Under Development [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	45,912,000
Initial Cost to Company of Land	45,658,000
Initial Cost to Company of Buildings and Improvements	2,564,000
Costs Capitalized Subsequent to Acquisition	200,809,000
Carrying Amount of Land	45,658,000
Carrying Amount of Buildings and Improvements	203,373,000
Total Carrying Amount	249,031,000
Accumulated Depreciation	0