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Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Properties [Line Items]
Initial Basis		$ 818,317
Cost Capitalized Subsequent to Acquisition		804,393
Basis at Close of Period, Land		427,267
Basis at Close of Period, Building and Improvements		1,193,622
Basis at Close of Period, Leasehold Interests		1,821
Total		1,622,710	$ 1,560,159	$ 1,459,439	$ 1,466,068
Accumulated Depreciation		425,370	396,617	$ 364,663	$ 353,305
Book Value		1,197,340	1,163,542
Related Debt		802,034	808,997
Development Land, Related Debt		45,208	$ 5,391
Total, Related Debt		847,242
Shopping Centers
Real Estate Properties [Line Items]
Initial Basis		766,970
Cost Capitalized Subsequent to Acquisition		393,939
Basis at Close of Period, Land		389,369
Basis at Close of Period, Building and Improvements		769,719
Basis at Close of Period, Leasehold Interests		1,821
Total		1,160,909
Accumulated Depreciation		295,522
Book Value		865,387
Related Debt		629,243
Shopping Centers | Ashburn Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis		11,431
Cost Capitalized Subsequent to Acquisition		19,713
Basis at Close of Period, Land		6,764
Basis at Close of Period, Building and Improvements		24,380
Basis at Close of Period, Leasehold Interests		0
Total		31,144
Accumulated Depreciation		11,578
Book Value		19,566
Related Debt		$ 29,564
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA
Real Estate Properties [Line Items]
Initial Basis		$ 1,178
Cost Capitalized Subsequent to Acquisition		7,503
Basis at Close of Period, Land		1,178
Basis at Close of Period, Building and Improvements		7,503
Basis at Close of Period, Leasehold Interests		0
Total		8,681
Accumulated Depreciation		1,108
Book Value		7,573
Related Debt		$ 0
Shopping Centers | Ashland Square Phase I, Dumfries, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		20 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Beacon Center, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis		$ 1,493
Cost Capitalized Subsequent to Acquisition		18,172
Basis at Close of Period, Land		0
Basis at Close of Period, Building and Improvements		18,571
Basis at Close of Period, Leasehold Interests		1,094
Total		19,665
Accumulated Depreciation		13,156
Book Value		6,509
Related Debt		$ 31,844
Shopping Centers | Beacon Center, Alexandria, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Beacon Center, Alexandria, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | BJ’s Wholesale Club, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis		$ 22,623
Cost Capitalized Subsequent to Acquisition		0
Basis at Close of Period, Land		22,623
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		22,623
Accumulated Depreciation		0
Book Value		22,623
Related Debt		$ 11,365
Buildings and Improvements Depreciable Lives in Years		0 years
Shopping Centers | Boca Valley Plaza, Boca Raton, FL
Real Estate Properties [Line Items]
Initial Basis		$ 16,720
Cost Capitalized Subsequent to Acquisition		1,434
Basis at Close of Period, Land		5,735
Basis at Close of Period, Building and Improvements		12,419
Basis at Close of Period, Leasehold Interests		0
Total		18,154
Accumulated Depreciation		3,877
Book Value		14,277
Related Debt		$ 10,587
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Boulevard, Fairfax, VA
Real Estate Properties [Line Items]
Initial Basis		$ 4,883
Cost Capitalized Subsequent to Acquisition		4,461
Basis at Close of Period, Land		3,687
Basis at Close of Period, Building and Improvements		5,657
Basis at Close of Period, Leasehold Interests		0
Total		9,344
Accumulated Depreciation		2,379
Book Value		6,965
Related Debt		$ 17,666
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Briggs Chaney MarketPlace, Silver Spring, MD
Real Estate Properties [Line Items]
Initial Basis		$ 27,037
Cost Capitalized Subsequent to Acquisition		3,497
Basis at Close of Period, Land		9,789
Basis at Close of Period, Building and Improvements		20,745
Basis at Close of Period, Leasehold Interests		0
Total		30,534
Accumulated Depreciation		6,684
Book Value		23,850
Related Debt		$ 15,064
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Broadlands Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis		$ 5,316
Cost Capitalized Subsequent to Acquisition		26,745
Basis at Close of Period, Land		5,300
Basis at Close of Period, Building and Improvements		26,761
Basis at Close of Period, Leasehold Interests		0
Total		32,061
Accumulated Depreciation		9,101
Book Value		22,960
Related Debt		$ 17,964
Shopping Centers | Broadlands Village, Ashburn, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Broadlands Village, Ashburn, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Countryside Marketplace, Sterling, VA
Real Estate Properties [Line Items]
Initial Basis		$ 28,912
Cost Capitalized Subsequent to Acquisition		3,286
Basis at Close of Period, Land		7,666
Basis at Close of Period, Building and Improvements		24,532
Basis at Close of Period, Leasehold Interests		0
Total		32,198
Accumulated Depreciation		7,278
Book Value		24,920
Related Debt		$ 15,098
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Cranberry Square, Westminster, MD
Real Estate Properties [Line Items]
Initial Basis		$ 31,578
Cost Capitalized Subsequent to Acquisition		512
Basis at Close of Period, Land		6,700
Basis at Close of Period, Building and Improvements		25,390
Basis at Close of Period, Leasehold Interests		0
Total		32,090
Accumulated Depreciation		2,736
Book Value		29,354
Related Debt		$ 18,150
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Cruse MarketPlace, Cumming, GA
Real Estate Properties [Line Items]
Initial Basis		$ 12,226
Cost Capitalized Subsequent to Acquisition		239
Basis at Close of Period, Land		3,901
Basis at Close of Period, Building and Improvements		8,564
Basis at Close of Period, Leasehold Interests		0
Total		12,465
Accumulated Depreciation		2,531
Book Value		9,934
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Flagship Center, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 160
Cost Capitalized Subsequent to Acquisition		9
Basis at Close of Period, Land		169
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		169
Accumulated Depreciation		0
Book Value		169
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		0 years
Shopping Centers | French Market, Oklahoma City, OK
Real Estate Properties [Line Items]
Initial Basis		$ 5,781
Cost Capitalized Subsequent to Acquisition		13,858
Basis at Close of Period, Land		1,118
Basis at Close of Period, Building and Improvements		18,521
Basis at Close of Period, Leasehold Interests		0
Total		19,639
Accumulated Depreciation		10,080
Book Value		9,559
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Germantown, Germantown, MD
Real Estate Properties [Line Items]
Initial Basis		$ 3,576
Cost Capitalized Subsequent to Acquisition		990
Basis at Close of Period, Land		2,034
Basis at Close of Period, Building and Improvements		2,532
Basis at Close of Period, Leasehold Interests		0
Total		4,566
Accumulated Depreciation		2,154
Book Value		2,412
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | 750/730/726 N. Glebe Road, Arlington, VA
Real Estate Properties [Line Items]
Initial Basis		$ 46,312
Cost Capitalized Subsequent to Acquisition		1,994
Basis at Close of Period, Land		44,831
Basis at Close of Period, Building and Improvements		3,475
Basis at Close of Period, Leasehold Interests		0
Total		48,306
Accumulated Depreciation		697
Book Value		47,609
Related Debt		$ 0
Shopping Centers | 750/730/726 N. Glebe Road, Arlington, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		2 years
Shopping Centers | 750/730/726 N. Glebe Road, Arlington, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		3 years
Shopping Centers | The Glen, Woodbridge, VA
Real Estate Properties [Line Items]
Initial Basis		$ 12,918
Cost Capitalized Subsequent to Acquisition		7,734
Basis at Close of Period, Land		5,300
Basis at Close of Period, Building and Improvements		15,352
Basis at Close of Period, Leasehold Interests		0
Total		20,652
Accumulated Depreciation		7,899
Book Value		12,753
Related Debt		$ 8,622
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Great Eastern, District Heights, MD
Real Estate Properties [Line Items]
Initial Basis		$ 4,993
Cost Capitalized Subsequent to Acquisition		10,678
Basis at Close of Period, Land		3,785
Basis at Close of Period, Building and Improvements		11,886
Basis at Close of Period, Leasehold Interests		0
Total		15,671
Accumulated Depreciation		8,023
Book Value		7,648
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Great Falls Center, Great Falls, VA
Real Estate Properties [Line Items]
Initial Basis		$ 41,750
Cost Capitalized Subsequent to Acquisition		2,986
Basis at Close of Period, Land		14,766
Basis at Close of Period, Building and Improvements		29,970
Basis at Close of Period, Leasehold Interests		0
Total		44,736
Accumulated Depreciation		5,876
Book Value		38,860
Related Debt		$ 14,177
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Hampshire Langley, Takoma, MD
Real Estate Properties [Line Items]
Initial Basis		$ 3,159
Cost Capitalized Subsequent to Acquisition		3,350
Basis at Close of Period, Land		1,856
Basis at Close of Period, Building and Improvements		4,653
Basis at Close of Period, Leasehold Interests		0
Total		6,509
Accumulated Depreciation		3,484
Book Value		3,025
Related Debt		$ 16,826
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Hunt Club Corners, Apopka, FL
Real Estate Properties [Line Items]
Initial Basis		$ 12,584
Cost Capitalized Subsequent to Acquisition		3,165
Basis at Close of Period, Land		4,822
Basis at Close of Period, Building and Improvements		10,927
Basis at Close of Period, Leasehold Interests		0
Total		15,749
Accumulated Depreciation		2,931
Book Value		12,818
Related Debt		$ 5,959
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Jamestown Place, Altamonte Springs, FL
Real Estate Properties [Line Items]
Initial Basis		$ 14,055
Cost Capitalized Subsequent to Acquisition		1,161
Basis at Close of Period, Land		4,455
Basis at Close of Period, Building and Improvements		10,761
Basis at Close of Period, Leasehold Interests		0
Total		15,216
Accumulated Depreciation		2,829
Book Value		12,387
Related Debt		$ 8,025
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Kentlands Square I, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 14,379
Cost Capitalized Subsequent to Acquisition		328
Basis at Close of Period, Land		5,006
Basis at Close of Period, Building and Improvements		9,701
Basis at Close of Period, Leasehold Interests		0
Total		14,707
Accumulated Depreciation		3,206
Book Value		11,501
Related Debt		$ 7,180
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Kentlands Square II, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 76,723
Cost Capitalized Subsequent to Acquisition		1,188
Basis at Close of Period, Land		22,800
Basis at Close of Period, Building and Improvements		55,111
Basis at Close of Period, Leasehold Interests		0
Total		77,911
Accumulated Depreciation		5,925
Book Value		71,986
Related Debt		$ 38,842
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Kentlands Place, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 1,425
Cost Capitalized Subsequent to Acquisition		7,202
Basis at Close of Period, Land		1,425
Basis at Close of Period, Building and Improvements		7,202
Basis at Close of Period, Leasehold Interests		0
Total		8,627
Accumulated Depreciation		3,176
Book Value		5,451
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Lansdowne Town Center, Leesburg, VA
Real Estate Properties [Line Items]
Initial Basis		$ 6,545
Cost Capitalized Subsequent to Acquisition		36,364
Basis at Close of Period, Land		6,546
Basis at Close of Period, Building and Improvements		36,363
Basis at Close of Period, Leasehold Interests		0
Total		42,909
Accumulated Depreciation		11,352
Book Value		31,557
Related Debt		$ 34,420
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Leesburg Pike Plaza, Baileys Crossroads, VA
Real Estate Properties [Line Items]
Initial Basis		$ 2,418
Cost Capitalized Subsequent to Acquisition		6,173
Basis at Close of Period, Land		1,132
Basis at Close of Period, Building and Improvements		7,459
Basis at Close of Period, Leasehold Interests		0
Total		8,591
Accumulated Depreciation		5,700
Book Value		2,891
Related Debt		$ 16,348
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Lumberton Plaza, Lumberton, NJ
Real Estate Properties [Line Items]
Initial Basis		$ 4,400
Cost Capitalized Subsequent to Acquisition		11,170
Basis at Close of Period, Land		950
Basis at Close of Period, Building and Improvements		14,620
Basis at Close of Period, Leasehold Interests		0
Total		15,570
Accumulated Depreciation		12,109
Book Value		3,461
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Metro Pike Center, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 33,123
Cost Capitalized Subsequent to Acquisition		3,090
Basis at Close of Period, Land		26,064
Basis at Close of Period, Building and Improvements		10,149
Basis at Close of Period, Leasehold Interests		0
Total		36,213
Accumulated Depreciation		973
Book Value		35,240
Related Debt		$ 14,801
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Shops at Monocacy, Frederick, MD
Real Estate Properties [Line Items]
Initial Basis		$ 9,541
Cost Capitalized Subsequent to Acquisition		13,926
Basis at Close of Period, Land		9,260
Basis at Close of Period, Building and Improvements		14,207
Basis at Close of Period, Leasehold Interests		0
Total		23,467
Accumulated Depreciation		4,635
Book Value		18,832
Related Debt		$ 13,387
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Northrock, Warrenton, VA
Real Estate Properties [Line Items]
Initial Basis		$ 12,686
Cost Capitalized Subsequent to Acquisition		15,167
Basis at Close of Period, Land		12,686
Basis at Close of Period, Building and Improvements		15,167
Basis at Close of Period, Leasehold Interests		0
Total		27,853
Accumulated Depreciation		2,813
Book Value		25,040
Related Debt		$ 15,748
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Olde Forte Village, Ft. Washington, MD
Real Estate Properties [Line Items]
Initial Basis		$ 15,933
Cost Capitalized Subsequent to Acquisition		6,514
Basis at Close of Period, Land		5,409
Basis at Close of Period, Building and Improvements		17,038
Basis at Close of Period, Leasehold Interests		0
Total		22,447
Accumulated Depreciation		6,112
Book Value		16,335
Related Debt		$ 10,928
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Olney, Olney, MD
Real Estate Properties [Line Items]
Initial Basis		$ 1,884
Cost Capitalized Subsequent to Acquisition		1,706
Basis at Close of Period, Land		0
Basis at Close of Period, Building and Improvements		3,590
Basis at Close of Period, Leasehold Interests		0
Total		3,590
Accumulated Depreciation		3,275
Book Value		315
Related Debt		$ 11,282
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Orchard Park, Dunwoody, GA
Real Estate Properties [Line Items]
Initial Basis		$ 19,377
Cost Capitalized Subsequent to Acquisition		814
Basis at Close of Period, Land		7,751
Basis at Close of Period, Building and Improvements		12,440
Basis at Close of Period, Leasehold Interests		0
Total		20,191
Accumulated Depreciation		2,703
Book Value		17,488
Related Debt		$ 10,492
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Palm Springs Center, Altamonte Springs, FL
Real Estate Properties [Line Items]
Initial Basis		$ 18,365
Cost Capitalized Subsequent to Acquisition		1,375
Basis at Close of Period, Land		5,739
Basis at Close of Period, Building and Improvements		14,001
Basis at Close of Period, Leasehold Interests		0
Total		19,740
Accumulated Depreciation		3,648
Book Value		16,092
Related Debt		$ 9,127
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Ravenwood, Baltimore, MD
Real Estate Properties [Line Items]
Initial Basis		$ 1,245
Cost Capitalized Subsequent to Acquisition		4,097
Basis at Close of Period, Land		703
Basis at Close of Period, Building and Improvements		4,639
Basis at Close of Period, Leasehold Interests		0
Total		5,342
Accumulated Depreciation		2,771
Book Value		2,571
Related Debt		$ 15,360
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | 11503 Rockville Pike/5541 Nicholson Lane, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 26,561
Cost Capitalized Subsequent to Acquisition		0
Basis at Close of Period, Land		22,113
Basis at Close of Period, Building and Improvements		4,448
Basis at Close of Period, Leasehold Interests		0
Total		26,561
Accumulated Depreciation		584
Book Value		25,977
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | 1500/1580/1582/1584 Rockville Pike, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 51,149
Cost Capitalized Subsequent to Acquisition		906
Basis at Close of Period, Land		43,863
Basis at Close of Period, Building and Improvements		8,192
Basis at Close of Period, Leasehold Interests		0
Total		52,055
Accumulated Depreciation		3,281
Book Value		48,774
Related Debt		0
Shopping Centers | Seabreeze Plaza, Palm Harbor, FL
Real Estate Properties [Line Items]
Initial Basis		24,526
Cost Capitalized Subsequent to Acquisition		1,525
Basis at Close of Period, Land		8,665
Basis at Close of Period, Building and Improvements		17,386
Basis at Close of Period, Leasehold Interests		0
Total		26,051
Accumulated Depreciation		4,566
Book Value		21,485
Related Debt		$ 17,011
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Market Place at Sea Colony, Bethany Beach, DE
Real Estate Properties [Line Items]
Initial Basis		$ 2,920
Cost Capitalized Subsequent to Acquisition		106
Basis at Close of Period, Land		1,147
Basis at Close of Period, Building and Improvements		1,879
Basis at Close of Period, Leasehold Interests		0
Total		3,026
Accumulated Depreciation		373
Book Value		2,653
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Seven Corners, Falls Church, VA
Real Estate Properties [Line Items]
Initial Basis		$ 4,848
Cost Capitalized Subsequent to Acquisition		43,692
Basis at Close of Period, Land		4,913
Basis at Close of Period, Building and Improvements		43,627
Basis at Close of Period, Leasehold Interests		0
Total		48,540
Accumulated Depreciation		26,614
Book Value		21,926
Related Debt		$ 67,850
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Severna Park Marketplace, Severna Park, MD
Real Estate Properties [Line Items]
Initial Basis		$ 63,254
Cost Capitalized Subsequent to Acquisition		86
Basis at Close of Period, Land		12,700
Basis at Close of Period, Building and Improvements		50,640
Basis at Close of Period, Leasehold Interests		0
Total		63,340
Accumulated Depreciation		5,381
Book Value		57,959
Related Debt		$ 34,133
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Shops at Fairfax, Fairfax, VA
Real Estate Properties [Line Items]
Initial Basis		$ 2,708
Cost Capitalized Subsequent to Acquisition		9,924
Basis at Close of Period, Land		992
Basis at Close of Period, Building and Improvements		11,640
Basis at Close of Period, Leasehold Interests		0
Total		12,632
Accumulated Depreciation		7,259
Book Value		5,373
Related Debt		$ 11,778
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Smallwood Village Center, Waldorf, MD
Real Estate Properties [Line Items]
Initial Basis		$ 17,819
Cost Capitalized Subsequent to Acquisition		7,619
Basis at Close of Period, Land		6,402
Basis at Close of Period, Building and Improvements		19,036
Basis at Close of Period, Leasehold Interests		0
Total		25,438
Accumulated Depreciation		5,763
Book Value		19,675
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Southdale, Glen Burnie, MD
Real Estate Properties [Line Items]
Initial Basis		$ 3,650
Cost Capitalized Subsequent to Acquisition		21,366
Basis at Close of Period, Land		0
Basis at Close of Period, Building and Improvements		24,394
Basis at Close of Period, Leasehold Interests		622
Total		25,016
Accumulated Depreciation		20,890
Book Value		4,126
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Southside Plaza, Richmond, VA
Real Estate Properties [Line Items]
Initial Basis		$ 6,728
Cost Capitalized Subsequent to Acquisition		10,357
Basis at Close of Period, Land		1,878
Basis at Close of Period, Building and Improvements		15,207
Basis at Close of Period, Leasehold Interests		0
Total		17,085
Accumulated Depreciation		11,595
Book Value		5,490
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | South Dekalb Plaza, Atlanta, GA
Real Estate Properties [Line Items]
Initial Basis		$ 2,474
Cost Capitalized Subsequent to Acquisition		4,130
Basis at Close of Period, Land		703
Basis at Close of Period, Building and Improvements		5,901
Basis at Close of Period, Leasehold Interests		0
Total		6,604
Accumulated Depreciation		4,491
Book Value		2,113
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Thruway, Winston-Salem, NC
Real Estate Properties [Line Items]
Initial Basis		$ 4,778
Cost Capitalized Subsequent to Acquisition		23,579
Basis at Close of Period, Land		5,496
Basis at Close of Period, Building and Improvements		22,756
Basis at Close of Period, Leasehold Interests		105
Total		28,357
Accumulated Depreciation		14,760
Book Value		13,597
Related Debt		$ 40,360
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Village Center, Centreville, VA
Real Estate Properties [Line Items]
Initial Basis		$ 16,502
Cost Capitalized Subsequent to Acquisition		1,971
Basis at Close of Period, Land		7,851
Basis at Close of Period, Building and Improvements		10,622
Basis at Close of Period, Leasehold Interests		0
Total		18,473
Accumulated Depreciation		6,003
Book Value		12,470
Related Debt		$ 14,197
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Westview Village, Frederick, MD
Real Estate Properties [Line Items]
Initial Basis		$ 6,047
Cost Capitalized Subsequent to Acquisition		22,499
Basis at Close of Period, Land		6,047
Basis at Close of Period, Building and Improvements		22,499
Basis at Close of Period, Leasehold Interests		0
Total		28,546
Accumulated Depreciation		5,310
Book Value		23,236
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | White Oak, Silver Spring, MD
Real Estate Properties [Line Items]
Initial Basis		$ 6,277
Cost Capitalized Subsequent to Acquisition		5,357
Basis at Close of Period, Land		4,649
Basis at Close of Period, Building and Improvements		6,985
Basis at Close of Period, Leasehold Interests		0
Total		11,634
Accumulated Depreciation		5,758
Book Value		5,876
Related Debt		$ 25,088
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Other Buildings / Improvements
Real Estate Properties [Line Items]
Cost Capitalized Subsequent to Acquisition		$ 221
Basis at Close of Period, Building and Improvements		221
Total		221
Accumulated Depreciation		95
Book Value		126
Related Debt		0
Mixed-Use Properties
Real Estate Properties [Line Items]
Initial Basis		41,725
Cost Capitalized Subsequent to Acquisition		333,429
Basis at Close of Period, Land		26,254
Basis at Close of Period, Building and Improvements		348,900
Basis at Close of Period, Leasehold Interests		0
Total		375,154
Accumulated Depreciation		129,848
Book Value		245,306
Related Debt		$ 172,791
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date One
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		5 years
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date Two
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		10 years
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date Three
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		5 years
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date Four
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		4 years
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 21,459
Cost Capitalized Subsequent to Acquisition		28,896
Basis at Close of Period, Land		3,756
Basis at Close of Period, Building and Improvements		46,599
Basis at Close of Period, Leasehold Interests		0
Total		50,355
Accumulated Depreciation		33,503
Book Value		16,852
Related Debt		$ 29,714
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		35 years
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		40 years
Mixed-Use Properties | Clarendon Center, Arlington, VA (1)
Real Estate Properties [Line Items]
Initial Basis	[1]	$ 12,753
Cost Capitalized Subsequent to Acquisition	[1]	185,129
Basis at Close of Period, Land	[1]	16,287
Basis at Close of Period, Building and Improvements	[1]	181,595
Basis at Close of Period, Leasehold Interests	[1]	0
Total	[1]	197,882
Accumulated Depreciation	[1]	27,412
Book Value	[1]	170,470
Related Debt	[1]	$ 112,299
Buildings and Improvements Depreciable Lives in Years		50 years
Mixed-Use Properties | 601 Pennsylvania Ave., Washington, DC
Real Estate Properties [Line Items]
Initial Basis		$ 5,479
Cost Capitalized Subsequent to Acquisition		65,773
Basis at Close of Period, Land		5,667
Basis at Close of Period, Building and Improvements		65,585
Basis at Close of Period, Leasehold Interests		0
Total		71,252
Accumulated Depreciation		47,842
Book Value		23,410
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		35 years
Mixed-Use Properties | Washington Square, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis		$ 2,034
Cost Capitalized Subsequent to Acquisition		53,631
Basis at Close of Period, Land		544
Basis at Close of Period, Building and Improvements		55,121
Basis at Close of Period, Leasehold Interests		0
Total		55,665
Accumulated Depreciation		21,091
Book Value		34,574
Related Debt		$ 30,778
Buildings and Improvements Depreciable Lives in Years		50 years
Development Land
Real Estate Properties [Line Items]
Initial Basis		$ 9,622
Cost Capitalized Subsequent to Acquisition		77,025
Basis at Close of Period, Land		11,644
Basis at Close of Period, Building and Improvements		75,003
Basis at Close of Period, Leasehold Interests		0
Total		86,647
Accumulated Depreciation		0
Book Value		86,647
Development Land, Related Debt		45,208
Development Land | Ashland Square Phase II, Manassas, VA
Real Estate Properties [Line Items]
Initial Basis		5,292
Cost Capitalized Subsequent to Acquisition		1,736
Basis at Close of Period, Land		7,028
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		7,028
Accumulated Depreciation		0
Book Value		7,028
Development Land, Related Debt		0
Development Land | New Market, New Market, MD
Real Estate Properties [Line Items]
Initial Basis		2,088
Cost Capitalized Subsequent to Acquisition		286
Basis at Close of Period, Land		2,374
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		2,374
Accumulated Depreciation		0
Book Value		2,374
Development Land, Related Debt		0
Development Land | Park Van Ness, Washington, DC
Real Estate Properties [Line Items]
Initial Basis		2,242
Cost Capitalized Subsequent to Acquisition		75,003
Basis at Close of Period, Land		2,242
Basis at Close of Period, Building and Improvements		75,003
Basis at Close of Period, Leasehold Interests		0
Total		77,245
Accumulated Depreciation		0
Book Value		77,245
Development Land, Related Debt		$ 45,208
[1] Includes the North and South Blocks and Residential

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