Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Real Estate Properties [Line Items]
Initial Basis	$ 1,088,613
Cost capitalized subsequent to acquisition	1,532,492
Land and Land Improvements	511,529
Buildings and Improvements, Gross	1,595,023
Construction in progress	514,553	$ 322,226
Real estate investments	2,621,105	2,408,136	$ 2,284,126	$ 2,124,796
Accumulated Depreciation	729,470	688,475	$ 650,113	$ 607,706
Total real estate investments, net	1,891,635	1,719,661
Fixed rate mortgages	935,451	961,577
Development land, related debt	77,305	$ 0
Total, related debt	1,030,285
Shopping Centers
Real Estate Properties [Line Items]
Initial Basis	835,537
Cost capitalized subsequent to acquisition	501,528
Land and Land Improvements	420,132
Buildings and Improvements, Gross	903,264
Construction in progress	13,669
Real estate investments	1,337,065
Accumulated Depreciation	480,348
Total real estate investments, net	856,717
Fixed rate mortgages	584,145
Shopping Centers | Ashbrook Marketplace, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis	8,938
Cost capitalized subsequent to acquisition	25,443
Land and Land Improvements	13,258
Buildings and Improvements, Gross	21,074
Construction in progress	49
Real estate investments	34,381
Accumulated Depreciation	2,745
Total real estate investments, net	31,636
Fixed rate mortgages	$ 20,216
Buildings and improvements depreciable lives in years	50 years
Shopping Centers | Ashburn Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis	$ 11,431
Cost capitalized subsequent to acquisition	21,000
Land and Land Improvements	6,764
Buildings and Improvements, Gross	25,658
Construction in progress	9
Real estate investments	32,431
Accumulated Depreciation	17,147
Total real estate investments, net	15,284
Fixed rate mortgages	$ 21,805
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | Ashburn Village, Ashburn, VA | Minimum
Real Estate Properties [Line Items]
Buildings and improvements depreciable lives in years	5 years
Shopping Centers | Ashburn Village, Ashburn, VA | Maximum
Real Estate Properties [Line Items]
Buildings and improvements depreciable lives in years	10 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA
Real Estate Properties [Line Items]
Initial Basis	$ 1,178
Cost capitalized subsequent to acquisition	7,508
Land and Land Improvements	1,178
Buildings and Improvements, Gross	7,508
Construction in progress	0
Real estate investments	8,686
Accumulated Depreciation	3,255
Total real estate investments, net	5,431
Fixed rate mortgages	$ 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	$ 24,161
Cost capitalized subsequent to acquisition	18,514
Land and Land Improvements	22,691
Buildings and Improvements, Gross	19,984
Construction in progress	0
Real estate investments	42,675
Accumulated Depreciation	17,210
Total real estate investments, net	25,465
Fixed rate mortgages	$ 53,681
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
Land and Land Improvements	22,623
Buildings and Improvements, Gross	0
Construction in progress	0
Real estate investments	22,623
Accumulated Depreciation	0
Total real estate investments, net	22,623
Fixed rate mortgages	$ 15,099
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	3,616
Land and Land Improvements	5,735
Buildings and Improvements, Gross	14,473
Construction in progress	128
Real estate investments	20,336
Accumulated Depreciation	7,161
Total real estate investments, net	13,175
Fixed rate mortgages	$ 0
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	4,731
Land and Land Improvements	3,687
Buildings and Improvements, Gross	5,921
Construction in progress	6
Real estate investments	9,614
Accumulated Depreciation	4,040
Total real estate investments, net	5,574
Fixed rate mortgages	$ 9,358
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	5,916
Land and Land Improvements	9,789
Buildings and Improvements, Gross	23,155
Construction in progress	9
Real estate investments	32,953
Accumulated Depreciation	12,079
Total real estate investments, net	20,874
Fixed rate mortgages	$ 0
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	36,806
Land and Land Improvements	5,300
Buildings and Improvements, Gross	36,360
Construction in progress	462
Real estate investments	42,122
Accumulated Depreciation	16,713
Total real estate investments, net	25,409
Fixed rate mortgages	$ 27,999
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 | Burtonsville Town Square, Burtonsville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 74,212
Cost capitalized subsequent to acquisition	6,357
Land and Land Improvements	28,402
Buildings and Improvements, Gross	52,149
Construction in progress	18
Real estate investments	80,569
Accumulated Depreciation	9,935
Total real estate investments, net	70,634
Fixed rate mortgages	$ 32,178
Shopping Centers | Burtonsville Town Square, Burtonsville, MD | Minimum
Real Estate Properties [Line Items]
Buildings and improvements depreciable lives in years	20 years
Shopping Centers | Burtonsville Town Square, Burtonsville, MD | Maximum
Real Estate Properties [Line Items]
Buildings and improvements depreciable lives in years	45 years
Shopping Centers | Countryside Marketplace, Sterling, VA
Real Estate Properties [Line Items]
Initial Basis	$ 28,912
Cost capitalized subsequent to acquisition	5,134
Land and Land Improvements	7,666
Buildings and Improvements, Gross	26,181
Construction in progress	199
Real estate investments	34,046
Accumulated Depreciation	13,764
Total real estate investments, net	20,282
Fixed rate mortgages	$ 0
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	2,047
Land and Land Improvements	6,700
Buildings and Improvements, Gross	26,906
Construction in progress	19
Real estate investments	33,625
Accumulated Depreciation	8,332
Total real estate investments, net	25,293
Fixed rate mortgages	$ 13,224
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	954
Land and Land Improvements	3,901
Buildings and Improvements, Gross	9,279
Construction in progress	0
Real estate investments	13,180
Accumulated Depreciation	4,700
Total real estate investments, net	8,480
Fixed rate mortgages	$ 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	409
Land and Land Improvements	169
Buildings and Improvements, Gross	400
Construction in progress	0
Real estate investments	569
Accumulated Depreciation	117
Total real estate investments, net	452
Fixed rate mortgages	$ 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	17,689
Land and Land Improvements	1,118
Buildings and Improvements, Gross	21,450
Construction in progress	902
Real estate investments	23,470
Accumulated Depreciation	15,159
Total real estate investments, net	8,311
Fixed rate mortgages	$ 0
Buildings and improvements depreciable lives in years	50 years
Shopping Centers | Germantown, Germantown, MD
Real Estate Properties [Line Items]
Initial Basis	$ 2,034
Cost capitalized subsequent to acquisition	566
Land and Land Improvements	2,034
Buildings and Improvements, Gross	566
Construction in progress	0
Real estate investments	2,600
Accumulated Depreciation	489
Total real estate investments, net	2,111
Fixed rate mortgages	$ 0
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | The Glen, Woodbridge, VA
Real Estate Properties [Line Items]
Initial Basis	$ 12,918
Cost capitalized subsequent to acquisition	8,799
Land and Land Improvements	5,300
Buildings and Improvements, Gross	16,377
Construction in progress	40
Real estate investments	21,717
Accumulated Depreciation	12,027
Total real estate investments, net	9,690
Fixed rate mortgages	$ 20,234
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	3,516
Land and Land Improvements	14,766
Buildings and Improvements, Gross	30,414
Construction in progress	86
Real estate investments	45,266
Accumulated Depreciation	12,945
Total real estate investments, net	32,321
Fixed rate mortgages	$ 30,547
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	3,559
Land and Land Improvements	1,892
Buildings and Improvements, Gross	4,816
Construction in progress	10
Real estate investments	6,718
Accumulated Depreciation	4,291
Total real estate investments, net	2,427
Fixed rate mortgages	$ 11,569
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	4,771
Land and Land Improvements	4,822
Buildings and Improvements, Gross	12,533
Construction in progress	0
Real estate investments	17,355
Accumulated Depreciation	6,613
Total real estate investments, net	10,742
Fixed rate mortgages	$ 0
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	2,486
Land and Land Improvements	4,455
Buildings and Improvements, Gross	12,085
Construction in progress	1
Real estate investments	16,541
Accumulated Depreciation	5,925
Total real estate investments, net	10,616
Fixed rate mortgages	$ 0
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	3,730
Land and Land Improvements	5,005
Buildings and Improvements, Gross	13,104
Construction in progress	0
Real estate investments	18,109
Accumulated Depreciation	5,561
Total real estate investments, net	12,548
Fixed rate mortgages	$ 18,840
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	3,555
Land and Land Improvements	23,133
Buildings and Improvements, Gross	56,860
Construction in progress	285
Real estate investments	80,278
Accumulated Depreciation	19,561
Total real estate investments, net	60,717
Fixed rate mortgages	$ 30,168
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	7,944
Land and Land Improvements	1,425
Buildings and Improvements, Gross	7,700
Construction in progress	244
Real estate investments	9,369
Accumulated Depreciation	4,951
Total real estate investments, net	4,418
Fixed rate mortgages	$ 6,406
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	43,903
Land and Land Improvements	6,546
Buildings and Improvements, Gross	43,593
Construction in progress	309
Real estate investments	50,448
Accumulated Depreciation	21,009
Total real estate investments, net	29,439
Fixed rate mortgages	$ 0
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	7,012
Land and Land Improvements	1,132
Buildings and Improvements, Gross	8,195
Construction in progress	103
Real estate investments	9,430
Accumulated Depreciation	6,523
Total real estate investments, net	2,907
Fixed rate mortgages	$ 11,822
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	11,792
Land and Land Improvements	950
Buildings and Improvements, Gross	15,161
Construction in progress	81
Real estate investments	16,192
Accumulated Depreciation	14,170
Total real estate investments, net	2,022
Fixed rate mortgages	$ 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	5,454
Land and Land Improvements	26,064
Buildings and Improvements, Gross	8,470
Construction in progress	4,043
Real estate investments	38,577
Accumulated Depreciation	2,903
Total real estate investments, net	35,674
Fixed rate mortgages	$ 0
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	16,070
Land and Land Improvements	9,260
Buildings and Improvements, Gross	16,351
Construction in progress	0
Real estate investments	25,611
Accumulated Depreciation	7,680
Total real estate investments, net	17,931
Fixed rate mortgages	$ 25,670
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	15,430
Land and Land Improvements	12,686
Buildings and Improvements, Gross	15,422
Construction in progress	8
Real estate investments	28,116
Accumulated Depreciation	6,734
Total real estate investments, net	21,382
Fixed rate mortgages	$ 12,135
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	6,979
Land and Land Improvements	5,409
Buildings and Improvements, Gross	17,468
Construction in progress	35
Real estate investments	22,912
Accumulated Depreciation	9,995
Total real estate investments, net	12,917
Fixed rate mortgages	$ 19,563
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | Olney, Olney, MD
Real Estate Properties [Line Items]
Initial Basis	$ 4,963
Cost capitalized subsequent to acquisition	3,026
Land and Land Improvements	3,079
Buildings and Improvements, Gross	4,910
Construction in progress	0
Real estate investments	7,989
Accumulated Depreciation	3,744
Total real estate investments, net	4,245
Fixed rate mortgages	$ 12,655
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	1,642
Land and Land Improvements	7,751
Buildings and Improvements, Gross	13,242
Construction in progress	26
Real estate investments	21,019
Accumulated Depreciation	5,692
Total real estate investments, net	15,327
Fixed rate mortgages	$ 0
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	2,534
Land and Land Improvements	5,739
Buildings and Improvements, Gross	14,665
Construction in progress	495
Real estate investments	20,899
Accumulated Depreciation	7,371
Total real estate investments, net	13,528
Fixed rate mortgages	$ 0
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	4,486
Land and Land Improvements	703
Buildings and Improvements, Gross	5,028
Construction in progress	0
Real estate investments	5,731
Accumulated Depreciation	3,717
Total real estate investments, net	2,014
Fixed rate mortgages	$ 11,361
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	24
Land and Land Improvements	22,113
Buildings and Improvements, Gross	4,472
Construction in progress	0
Real estate investments	26,585
Accumulated Depreciation	1,488
Total real estate investments, net	25,097
Fixed rate mortgages	$ 0
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | 1500/1580/1582 Rockville Pike, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis	$ 45,351
Cost capitalized subsequent to acquisition	2,046
Land and Land Improvements	38,065
Buildings and Improvements, Gross	7,050
Construction in progress	2,282
Real estate investments	47,397
Accumulated Depreciation	6,950
Total real estate investments, net	40,447
Fixed rate mortgages	0
Shopping Centers | Seabreeze Plaza, Palm Harbor, FL
Real Estate Properties [Line Items]
Initial Basis	24,526
Cost capitalized subsequent to acquisition	3,553
Land and Land Improvements	8,665
Buildings and Improvements, Gross	18,943
Construction in progress	471
Real estate investments	28,079
Accumulated Depreciation	8,991
Total real estate investments, net	19,088
Fixed rate mortgages	$ 12,683
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	339
Land and Land Improvements	1,147
Buildings and Improvements, Gross	2,112
Construction in progress	0
Real estate investments	3,259
Accumulated Depreciation	858
Total real estate investments, net	2,401
Fixed rate mortgages	$ 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	46,536
Land and Land Improvements	4,929
Buildings and Improvements, Gross	46,450
Construction in progress	5
Real estate investments	51,384
Accumulated Depreciation	35,402
Total real estate investments, net	15,982
Fixed rate mortgages	$ 85,889
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	3,588
Land and Land Improvements	12,700
Buildings and Improvements, Gross	54,035
Construction in progress	107
Real estate investments	66,842
Accumulated Depreciation	15,930
Total real estate investments, net	50,912
Fixed rate mortgages	$ 24,458
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	11,109
Land and Land Improvements	992
Buildings and Improvements, Gross	12,825
Construction in progress	0
Real estate investments	13,817
Accumulated Depreciation	9,787
Total real estate investments, net	4,030
Fixed rate mortgages	$ 13,094
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	8,915
Land and Land Improvements	6,402
Buildings and Improvements, Gross	20,143
Construction in progress	189
Real estate investments	26,734
Accumulated Depreciation	11,922
Total real estate investments, net	14,812
Fixed rate mortgages	$ 0
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | Southdale, Glen Burnie, MD
Real Estate Properties [Line Items]
Initial Basis	$ 18,895
Cost capitalized subsequent to acquisition	26,767
Land and Land Improvements	15,255
Buildings and Improvements, Gross	29,318
Construction in progress	1,089
Real estate investments	45,662
Accumulated Depreciation	24,607
Total real estate investments, net	21,055
Fixed rate mortgages	$ 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	12,284
Land and Land Improvements	1,878
Buildings and Improvements, Gross	17,134
Construction in progress	0
Real estate investments	19,012
Accumulated Depreciation	14,019
Total real estate investments, net	4,993
Fixed rate mortgages	$ 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	5,111
Land and Land Improvements	615
Buildings and Improvements, Gross	6,901
Construction in progress	69
Real estate investments	7,585
Accumulated Depreciation	5,601
Total real estate investments, net	1,984
Fixed rate mortgages	$ 0
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | Thruway, Winston-Salem, NC
Real Estate Properties [Line Items]
Initial Basis	$ 7,848
Cost capitalized subsequent to acquisition	31,346
Land and Land Improvements	7,692
Buildings and Improvements, Gross	29,867
Construction in progress	1,635
Real estate investments	39,194
Accumulated Depreciation	21,721
Total real estate investments, net	17,473
Fixed rate mortgages	$ 0
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	3,486
Land and Land Improvements	7,851
Buildings and Improvements, Gross	12,137
Construction in progress	0
Real estate investments	19,988
Accumulated Depreciation	8,866
Total real estate investments, net	11,122
Fixed rate mortgages	$ 24,460
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	25,754
Land and Land Improvements	6,047
Buildings and Improvements, Gross	25,725
Construction in progress	29
Real estate investments	31,801
Accumulated Depreciation	12,949
Total real estate investments, net	18,852
Fixed rate mortgages	$ 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	7,110
Land and Land Improvements	4,649
Buildings and Improvements, Gross	8,512
Construction in progress	226
Real estate investments	13,387
Accumulated Depreciation	6,821
Total real estate investments, net	6,566
Fixed rate mortgages	$ 19,031
Buildings and improvements depreciable lives in years	40 years
Shopping Centers | Other Buildings / Improvements
Real Estate Properties [Line Items]
Cost capitalized subsequent to acquisition	$ 182
Buildings and Improvements, Gross	182
Construction in progress
Real estate investments	182
Accumulated Depreciation	178
Total real estate investments, net	4
Fixed rate mortgages	0
Mixed-Use Properties
Real Estate Properties [Line Items]
Initial Basis	96,034
Cost capitalized subsequent to acquisition	679,679
Land and Land Improvements	82,114
Buildings and Improvements, Gross	691,759
Construction in progress	1,840
Real estate investments	775,713
Accumulated Depreciation	249,122
Total real estate investments, net	526,591
Fixed rate mortgages	363,505
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis	21,459
Cost capitalized subsequent to acquisition	37,762
Land and Land Improvements	3,756
Buildings and Improvements, Gross	55,385
Construction in progress	80
Real estate investments	59,221
Accumulated Depreciation	43,412
Total real estate investments, net	15,809
Fixed rate mortgages	$ 21,611
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	$ 12,753
Cost capitalized subsequent to acquisition	188,640
Land and Land Improvements	16,287
Buildings and Improvements, Gross	184,486
Construction in progress	620
Real estate investments	201,393
Accumulated Depreciation	65,111
Total real estate investments, net	136,282
Fixed rate mortgages	$ 81,693
Buildings and improvements depreciable lives in years	50 years
Mixed-Use Properties | Park Van Ness, Washington, DC
Real Estate Properties [Line Items]
Initial Basis	$ 2,242
Cost capitalized subsequent to acquisition	91,960
Land and Land Improvements	2,242
Buildings and Improvements, Gross	91,775
Construction in progress	185
Real estate investments	94,202
Accumulated Depreciation	20,370
Total real estate investments, net	73,832
Fixed rate mortgages	$ 60,874
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	71,722
Land and Land Improvements	5,667
Buildings and Improvements, Gross	71,041
Construction in progress	493
Real estate investments	77,201
Accumulated Depreciation	60,634
Total real estate investments, net	16,567
Fixed rate mortgages	$ 0
Buildings and improvements depreciable lives in years	35 years
Mixed-Use Properties | The Waycroft, Arlington, VA
Real Estate Properties [Line Items]
Initial Basis	$ 52,067
Cost capitalized subsequent to acquisition	228,794
Land and Land Improvements	53,618
Buildings and Improvements, Gross	227,243
Construction in progress	0
Real estate investments	280,861
Accumulated Depreciation	25,188
Total real estate investments, net	255,673
Fixed rate mortgages	$ 149,078
Buildings and improvements depreciable lives in years	50 years
Mixed-Use Properties | Washington Square, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis	$ 2,034
Cost capitalized subsequent to acquisition	60,801
Land and Land Improvements	544
Buildings and Improvements, Gross	61,829
Construction in progress	462
Real estate investments	62,835
Accumulated Depreciation	34,407
Total real estate investments, net	28,428
Fixed rate mortgages	$ 50,249
Buildings and improvements depreciable lives in years	50 years
Development Land
Real Estate Properties [Line Items]
Initial Basis	$ 157,042
Cost capitalized subsequent to acquisition	351,285
Land and Land Improvements	9,283
Buildings and Improvements, Gross	0
Construction in progress	499,044
Real estate investments	508,327
Accumulated Depreciation	0
Total real estate investments, net	508,327
Development land, related debt	82,635
Development Land | Ashland Square Phase II, Manassas, VA
Real Estate Properties [Line Items]
Initial Basis	5,292
Cost capitalized subsequent to acquisition	3,448
Land and Land Improvements	7,049
Buildings and Improvements, Gross	0
Construction in progress	1,691
Real estate investments	8,740
Accumulated Depreciation	0
Total real estate investments, net	8,740
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	146
Land and Land Improvements	2,234
Buildings and Improvements, Gross	0
Construction in progress	0
Real estate investments	2,234
Accumulated Depreciation	0
Total real estate investments, net	2,234
Development land, related debt	0
Development Land | Hampden House, Bethesda, MD
Real Estate Properties [Line Items]
Initial Basis	39,641
Cost capitalized subsequent to acquisition	102,599
Land and Land Improvements	0
Buildings and Improvements, Gross	0
Construction in progress	142,240
Real estate investments	142,240
Accumulated Depreciation	0
Total real estate investments, net	142,240
Development land, related debt	7,726
Development Land | Twinbrook, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis	110,021
Cost capitalized subsequent to acquisition	245,092
Land and Land Improvements	0
Buildings and Improvements, Gross	0
Construction in progress	355,113
Real estate investments	355,113
Accumulated Depreciation	0
Total real estate investments, net	355,113
Development land, related debt	$ 74,909