Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2014

SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]

Real Estate and Accumulated Depreciation Disclosure [Text Block]

								Gross Amount at Which Carried
				Initial Cost				December 31, 2014
Property Name	City	State	Encumbrances at December 31, 2014 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2014 (c)	Year of Construction	Year Acquired	Depreciable Life
PENNSYLVANIA SUBURBS
400 Berwyn Park	Berwyn	PA	—	2,657	4,462	14,011		2,657	18,473	21,130	6,255	1999	1999	40
300 Berwyn Park	Berwyn	PA	—	2,206	13,422	3,800		2,206	17,222	19,428	8,280	1989	1997	40
1050 Westlakes Drive	Berwyn	PA	—	2,611	10,445	5,047		2,611	15,492	18,103	7,984	1984	1999	40
1200 Swedesford Road	Berwyn	PA	—	2,595	11,809	3,534		2,595	15,343	17,938	6,457	1994	2001	40
200 Berwyn Park	Berwyn	PA	—	1,533	9,460	2,466		1,533	11,926	13,459	5,751	1987	1997	40
1180 Swedesford Road	Berwyn	PA	—	2,086	8,342	2,979		2,086	11,321	13,407	3,441	1987	2001	40
100 Berwyn Park	Berwyn	PA	—	1,180	7,290	2,228		1,180	9,518	10,698	4,661	1986	1997	40
1160 Swedesford Road	Berwyn	PA	—	1,781	7,124	4,255		2,045	11,115	13,160	2,961	1986	2001	40
1100 Cassett Road	Berwyn	PA	—	1,695	6,779	1,269		1,695	8,048	9,743	2,561	1997	2001	40
980 Harvest Drive	Blue Bell	PA	—	2,079	8,315	736		2,079	9,051	11,130	2,935	1988	2002	40
910 Harvest Drive	Blue Bell	PA	—	1,224	8,645	(730	)	1,224	7,915	9,139	4,394	1990	1998	40
925 Harvest Drive	Blue Bell	PA	—	1,671	6,606	993		1,671	7,599	9,270	3,480	1990	1998	40
920 Harvest Drive	Blue Bell	PA	—	1,209	6,595	(684	)	1,209	5,911	7,120	3,134	1990	1998	40
181 Washington Street	Conshohocken	PA	—	6,927	14,722	786		6,927	15,508	22,435	698	1999	2013	40
426 Lancaster Avenue	Devon	PA	—	1,689	6,756	376		1,689	7,132	8,821	3,431	1990	1998	40
52 Swedesford Square	East Whiteland Twp.	PA	—	4,241	16,579	3,262		4,241	19,841	24,082	8,392	1988	1998	40
One Progress Drive	Horsham	PA	—	1,399	5,629	5,202		1,399	10,831	12,230	4,457	1986	1996	40
500 Enterprise Drive	Horsham	PA	—	1,303	5,188	3,743		1,303	8,931	10,234	4,098	1990	1996	40
640 Freedom Business Center	King Of Prussia	PA	—	4,222	16,891	4,686		4,222	21,577	25,799	9,535	1991	1998	40
555 Croton Road	King of Prussia	PA	—	4,486	17,943	1,412		4,486	19,355	23,841	6,779	1999	2001	40
630 Allendale Road	King of Prussia	PA	—	2,836	4,028	12,484		2,898	16,450	19,348	5,778	2000	2000	40
620 Freedom Business Center	King Of Prussia	PA	—	2,770	11,014	3,375		2,770	14,389	17,159	7,515	1986	1998	40
1000 First Avenue	King Of Prussia	PA	—	2,772	10,936	2,117		2,772	13,053	15,825	5,894	1980	1998	40
1060 First Avenue	King Of Prussia	PA	—	2,712	10,953	4,522		2,712	15,475	18,187	6,646	1987	1998	40
630 Freedom Business Center	King Of Prussia	PA	—	2,773	11,144	2,343		2,773	13,487	16,260	6,300	1989	1998	40
1020 First Avenue	King Of Prussia	PA	—	2,168	8,576	7,617		2,168	16,193	18,361	6,766	1984	1998	40
1040 First Avenue	King Of Prussia	PA	—	2,860	11,282	6,080		2,860	17,362	20,222	5,460	1985	1998	40
610 Freedom Business Center	King Of Prussia	PA	—	2,017	8,070	2,393		2,017	10,463	12,480	4,883	1985	1998	40
650 Park Avenue	King Of Prussia	PA	—	1,916	4,378	1,701		1,916	6,079	7,995	2,920	1968	1998	40
500 North Gulph Road	King Of Prussia	PA	—	1,303	5,201	1,522		1,303	6,723	8,026	3,390	1979	1996	40
741 First Avenue	King Of Prussia	PA	—	1,287	5,151	11		1,287	5,162	6,449	2,363	1966	1998	40
751-761 Fifth Avenue	King Of Prussia	PA	—	1,097	4,391	31		1,097	4,422	5,519	2,021	1967	1998	40
620 Allendale Road	King Of Prussia	PA	—	1,020	3,839	658		1,020	4,497	5,517	2,008	1961	1998	40
600 Park Avenue	King Of Prussia	PA	—	1,012	4,048	385		1,012	4,433	5,445	2,045	1964	1998	40

												Gross Amount at Which Carried
					Initial Cost							December 31, 2014
Property Name	City	State	Encumbrances at December 31, 2014 (a)		Land		Building and Improvements		Net Improvements (Retirements) Since Acquisition			Land		Building and Improvements		Total (b)		Accumulated Depreciation at December 31, 2014 (c)		Year of Construction	Year Acquired	Depreciable Life
660 Allendale Road	King Of Prussia	PA	$	—	$	396	$	948	$	2,957		$	1,085	$	3,216	$	4,301	$	921	2011	1998	40
640 Allendale Road	King of Prussia	PA	—		439		432		1,580			439		2,012		2,451		802		2000	2000	40
14 Campus Boulevard	Newtown Square	PA	—		2,244		4,217		1,533			2,244		5,750		7,994		3,322		1998	1998	40
17 Campus Boulevard	Newtown Square	PA	—		1,108		5,155		(374		)	1,108		4,781		5,889		1,728		2001	1997	40
11 Campus Boulevard	Newtown Square	PA	—		1,112		4,067		1,006			1,112		5,073		6,185		1,967		1998	1999	40
15 Campus Boulevard	Newtown Square	PA	—		1,164		3,896		249			1,164		4,145		5,309		1,394		2002	2000	40
18 Campus Boulevard	Newtown Square	PA	—		787		3,312		(77		)	787		3,235		4,022		1,631		1990	1996	40
401 Plymouth Road	Plymouth Meeting	PA	—		6,198		16,131		16,130			6,198		32,261		38,459		9,982		2001	2000	40
4000 Chemical Road	Plymouth Meeting	PA	—		4,373		24,546		1,467			4,373		26,013		30,386		4,864		2006	2001	40
610 West Germantown Pike	Plymouth Meeting	PA	—		3,651		14,514		3,357			3,651		17,871		21,522		5,892		1987	2002	40
600 West Germantown Pike	Plymouth Meeting	PA	—		3,652		15,288		1,609			3,652		16,897		20,549		5,659		1986	2002	40
630 West Germantown Pike	Plymouth Meeting	PA	—		3,558		14,743		1,902			3,558		16,645		20,203		5,994		1988	2002	40
620 West Germantown Pike	Plymouth Meeting	PA	—		3,572		14,435		1,339			3,572		15,774		19,346		5,378		1990	2002	40
660 West Germantown Pike	Plymouth Meeting	PA	—		3,694		5,487		18,484			5,404		22,261		27,665		1,436		1987	2012	30
2240/2250 Butler Pike	Plymouth Meeting	PA	—		1,104		4,627		1,312			1,104		5,939		7,043		3,596		1984	1996	40
2260 Butler Pike	Plymouth Meeting	PA	—		661		2,727		2,115			661		4,842		5,503		2,165		1984	1996	40
120 West Germantown Pike	Plymouth Meeting	PA	—		685		2,773		729			685		3,502		4,187		1,767		1984	1996	40
140 West Germantown Pike	Plymouth Meeting	PA	—		481		1,976		282			481		2,258		2,739		1,079		1984	1996	40
351 Plymouth Road	Plymouth Meeting	PA	—		1,043		555		—			1,043		555		1,598		135		N/A	2000	40
150 Radnor Chester Road	Radnor	PA	—		11,925		36,986		12,549			11,897		49,563		61,460		16,431		1983	2004	29
One Radnor Corporate Center	Radnor	PA	—		7,323		28,613		23,182			7,323		51,795		59,118		18,406		1998	2004	29
201 King of Prussia Road	Radnor	PA	—		8,956		29,811		5,070			8,949		34,888		43,837		15,445		2001	2004	25

555 Lancaster Avenue	Radnor	PA	—	8,014	16,508	16,854	8,609	32,767	41,376	12,563	1973	2004	24
Four Radnor Corporate Center	Radnor	PA	—	5,406	21,390	8,501	5,705	29,592	35,297	10,480	1995	2004	30
Five Radnor Corporate Center	Radnor	PA	—	6,506	25,525	5,455	6,578	30,908	37,486	8,024	1998	2004	38
Three Radnor Corporate Center	Radnor	PA	—	4,773	17,961	2,645	4,791	20,588	25,379	8,094	1998	2004	29
Two Radnor Corporate Center	Radnor	PA	—	3,937	15,484	3,888	3,942	19,367	23,309	6,882	1998	2004	29
130 Radnor Chester Road	Radnor	PA	—	2,573	8,338	3,483	2,567	11,827	14,394	4,357	1983	2004	25
170 Radnor Chester Road	Radnor	PA	—	2,514	8,147	1,718	2,509	9,870	12,379	3,051	1983	2004	25
200 Radnor Chester Road	Radnor	PA	—	3,366	—	3,675	3,366	3,675	7,041	113	2014	2005	40

								Gross Amount at Which Carried
				Initial Cost				December 31, 2014
Property Name	City	State	Encumbrances at December 31, 2014 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2014 (c)	Year of Construction	Year Acquired	Depreciable Life
101 West Elm Street	W. Conshohocken	PA	—	6,251	25,209	3,189		6,251	28,398	34,649	7,640	1999	2005	40
1 West Elm Street	W. Conshohocken	PA	—	3,557	14,249	3,876		3,557	18,125	21,682	4,204	1999	2005	40
595 East Swedesford Road	Wayne	PA	—	2,729	10,917	2,307		2,729	13,224	15,953	4,464	1998	2003	40
575 East Swedesford Road	Wayne	PA	—	2,178	8,712	1,681		2,178	10,393	12,571	3,692	1985	2003	40
565 East Swedesford Road	Wayne	PA	—	1,872	7,489	1,744		1,872	9,233	11,105	3,166	1984	2003	40
585 East Swedesford Road	Wayne	PA	—	1,350	5,401	1,350		1,350	6,751	8,101	1,551	1998	2003	40
PHILADELPHIA CBD
2970 Market Street	Philadelphia	PA	184,442	22,430	217,763	12,021		22,430	229,784	252,214	27,560	2010	2007	40
2929 Arch Street	Philadelphia	PA	—	—	208,570	29,302		12,586	225,286	237,872	85,000	2005	N/A	40
1717 Arch Street	Philadelphia	PA	—	—	98,188	66,550		25,195	139,543	164,738	19,000	1990	2010	40
2001 Market Street	Philadelphia	PA	112,000	15,323	120,842	2,125		15,323	122,967	138,290	3,371	1992	2013	40
130 North 18th Street	Philadelphia	PA	—	14,496	107,736	17,397		14,473	125,156	139,629	37,755	1998	2004	34
100 North 18th Street	Philadelphia	PA	87,767	16,066	100,255	10,925		16,066	111,180	127,246	35,435	1988	2004	36
2005 Market Street	Philadelphia	PA	123,205	15,161	122,486	(11,726	)	15,161	110,760	125,921	2,959	1987	2013	40
2930 Chestnut Street	Philadelphia	PA	37,765	—	76,008	2,644		—	78,652	78,652	8,677	2010	N/A	40
1900 Market Street	Philadelphia	PA	—	7,768	17,263	481		7,768	17,744	25,512	1,246	1981	2012	30
3020 Market Street	Philadelphia	PA	—	—	21,417	6,225		—	27,642	27,642	3,260	1959	2011	26
101 - 103 Juniper Street	Philadelphia	PA	—	—	14,401	324		478	14,247	14,725	1,865	2010	2006	40
Philadelphia Marine Center	Philadelphia	PA	—	532	2,196	3,444		628	5,544	6,172	2,408	Various	1998	40
METROPOLITAN WASHINGTON, D.C.
11720 Beltsville Drive	Beltsville	MD	—	3,831	16,661	3,399		3,904	19,987	23,891	5,887	1987	2006	46
11700 Beltsville Drive	Beltsville	MD	—	2,808	12,081	293		2,863	12,319	15,182	2,702	1981	2006	46
11710 Beltsville Drive	Beltsville	MD	—	2,278	11,100	(814	)	2,321	10,243	12,564	2,370	1987	2006	46
6600 Rockledge Drive	Bethesda	MD	—	—	37,421	11,303		—	48,724	48,724	15,070	1981	2006	50
11740 Beltsville Drive	Bethesda	MD	—	198	870	42		202	908	1,110	211	1987	2006	46
12015 Lee Jackson Memorial Highway	Fairfax	VA	—	3,770	22,895	3,987		3,841	26,811	30,652	7,188	1985	2006	42
11781 Lee Jackson Memorial Highway	Fairfax	VA	—	3,246	19,836	567		3,307	20,342	23,649	4,748	1982	2006	40
4401 Fair Lakes Court	Fairfax	VA	—	1,569	11,982	247		1,599	12,199	13,798	2,456	1988	2006	52
3141 Fairview Park Drive (d)	Falls Church	VA	21,242	5,918	40,981	12,017		7,080	51,836	58,916	10,264	1988	2006	51
2340 Dulles Corner Boulevard	Herndon	VA	—	16,345	65,379	18,280		16,129	83,875	100,004	28,064	1987	2006	40
2291 Wood Oak Drive	Herndon	VA	—	8,243	52,413	13,499		8,782	65,373	74,155	13,524	1999	2006	55
196/198 Van Buren Street	Herndon	VA	—	7,931	43,812	9,040		8,348	52,435	60,783	10,308	1991	2006	53
2251 Corporate Park Drive	Herndon	VA	—	11,472	45,893	2,276		11,472	48,169	59,641	9,758	2000	2006	40
2355 Dulles Corner Boulevard	Herndon	VA	—	10,365	43,876	4,648		10,365	48,524	58,889	12,675	1988	2006	40
2411 Dulles Corner Park	Herndon	VA	—	7,279	46,340	117		7,417	46,319	53,736	8,645	1990	2006	50
13880 Dulles Corner Lane	Herndon	VA	—	7,236	39,213	3,369		7,373	42,445	49,818	7,824	1997	2006	55

							Gross Amount at Which Carried
				Initial Cost			December 31, 2014
Property Name	City	State	Encumbrances at December 31, 2014 (a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition	Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2014 (c)	Year of Construction	Year Acquired	Depreciable Life
2121 Cooperative Way	Herndon	VA	—	5,598	38,639	2,532	5,795	40,974	46,769	7,665	2000	2006	54
2201 Cooperative Way	Herndon	VA	—	4,809	34,093	4,513	4,809	38,606	43,415	7,153	1990	2006	54
13825 Sunrise Valley Drive	Herndon	VA	—	3,794	19,365	2,121	3,866	21,414	25,280	4,441	1989	2006	46
1676 International Drive	Mclean	VA	58,470	18,437	97,538	3,183	18,785	100,373	119,158	16,619	1999	2006	55
8260 Greensboro Drive	Mclean	VA	31,043	7,952	33,964	1,641	8,102	35,455	43,557	7,320	1980	2006	52
2273 Research Boulevard	Rockville	MD	—	5,167	31,110	3,764	5,237	34,804	40,041	10,191	1999	2006	45
2275 Research Boulevard	Rockville	MD	—	5,059	29,668	6,479	5,154	36,052	41,206	7,672	1990	2006	45
2277 Research Boulevard	Rockville	MD	—	4,649	26,952	695	4,733	27,563	32,296	5,724	1986	2006	45
1900 Gallows Road	Vienna	VA	—	7,797	47,817	10,849	7,944	58,519	66,463	11,008	1989	2006	52
8521 Leesburg Pike	Vienna	VA	—	4,316	30,885	4,858	4,397	35,662	40,059	6,399	1984	2006	51
NEW JERSEY/DELAWARE
457 Haddonfield Road (e)	Cherry Hill	NJ	—	2,142	9,120	1,402	2,142	10,522	12,664	5,273	1990	1996	40
200 Lake Drive East	Cherry Hill	NJ	—	2,069	8,275	1,328	2,069	9,603	11,672	3,635	1989	2001	40
220 Lake Drive East	Cherry Hill	NJ	—	2,144	8,798	825	2,144	9,623	11,767	3,490	1988	2001	40
210 Lake Drive East	Cherry Hill	NJ	—	1,645	6,579	1,917	1,645	8,496	10,141	2,812	1986	2001	40
20 East Clementon Road	Gibbsboro	NJ	—	769	3,055	480	769	3,535	4,304	1,682	1986	1997	40
10 Foster Avenue	Gibbsboro	NJ	—	244	971	78	244	1,049	1,293	497	1983	1997	40
7 Foster Avenue	Gibbsboro	NJ	—	231	921	123	231	1,044	1,275	475	1983	1997	40
50 East Clementon Road	Gibbsboro	NJ	—	114	964	653	114	1,617	1,731	483	1986	1997	40
2 Foster Avenue	Gibbsboro	NJ	—	185	730	16	185	746	931	351	1974	1997	40
4 Foster Avenue	Gibbsboro	NJ	—	183	726	16	183	742	925	343	1974	1997	40
1 Foster Avenue	Gibbsboro	NJ	—	93	364	57	93	421	514	215	1972	1997	40
5 U.S. Avenue	Gibbsboro	NJ	—	21	81	3	21	84	105	39	1987	1997	40
5 Foster Avenue	Gibbsboro	NJ	—	9	32	26	9	58	67	28	1968	1997	40

Two Eves Drive	Marlton	NJ	—	818	3,461	234	818	3,695	4,513	1,825	1987	1997	40
Five Eves Drive	Marlton	NJ	—	703	2,819	665	703	3,484	4,187	1,643	1986	1997	40
Four B Eves Drive	Marlton	NJ	—	588	2,369	420	588	2,789	3,377	1,449	1987	1997	40
Four A Eves Drive	Marlton	NJ	—	539	2,168	322	539	2,490	3,029	1,122	1987	1997	40
308 Harper Drive	Moorestown	NJ	—	1,643	6,663	739	1,643	7,402	9,045	3,258	1976	1998	40
1120 Executive Boulevard	Mt. Laurel	NJ	—	2,074	8,415	4,398	2,074	12,813	14,887	5,143	1987	1997	40
10000 Midlantic Drive	Mt. Laurel	NJ	—	3,206	12,857	4,228	3,206	17,085	20,291	7,138	1990	1997	40
700 East Gate Drive	Mt. Laurel	NJ	—	3,569	14,436	2,243	3,569	16,679	20,248	7,576	1984	1998	40
15000 Midlantic Drive	Mt. Laurel	NJ	—	3,061	12,254	1,619	3,061	13,873	16,934	6,518	1991	1997	40
1000 Howard Boulevard	Mt. Laurel	NJ	—	2,297	9,288	3,922	2,297	13,210	15,507	5,900	1988	1997	40
1000 Atrium Way (e)	Mt. Laurel	NJ	—	2,061	8,180	4,531	2,061	12,711	14,772	5,894	1989	1997	40
2000 Midlantic Drive	Mt. Laurel	NJ	—	2,202	8,823	2,970	2,202	11,793	13,995	5,349	1989	1997	40
701 East Gate Drive	Mt. Laurel	NJ	—	1,736	6,877	1,768	1,736	8,645	10,381	3,715	1986	1998	40

								Gross Amount at Which Carried
				Initial Cost				December 31, 2014
Property Name	City	State	Encumbrances at December 31, 2014(a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2014 (c)	Year of Construction	Year Acquired	Depreciable Life
9000 Midlantic Drive	Mt. Laurel	NJ	—	1,472	5,895	2,185		1,472	8,080	9,552	3,503	1989	1997	40
307 Fellowship Drive	Mt. Laurel	NJ	—	1,565	6,342	1,517		1,565	7,859	9,424	3,472	1981	1998	40
305 Fellowship Drive	Mt. Laurel	NJ	—	1,421	5,768	1,631		1,421	7,399	8,820	3,122	1980	1998	40
303 Fellowship Drive	Mt. Laurel	NJ	—	1,493	6,055	851		1,493	6,906	8,399	3,114	1979	1998	40
309 Fellowship Drive	Mt. Laurel	NJ	—	1,518	6,154	780		1,518	6,934	8,452	3,070	1982	1998	40
1000 Bishops Gate	Mt. Laurel	NJ	—	934	6,287	(647	)	934	5,640	6,574	1,534	2005	2000	40
161 Gaither Drive	Mt. Laurel	NJ	—	1,016	4,064	731		1,016	4,795	5,811	1,855	1987	2001	40
815 East Gate Drive	Mt. Laurel	NJ	—	636	2,584	550		636	3,134	3,770	1,436	1986	1998	40
4000 Midlantic Drive	Mt. Laurel	NJ	—	714	5,085	(1,833	)	714	3,252	3,966	1,531	1998	1997	40
817 East Gate Drive	Mt. Laurel	NJ	—	611	2,426	263		611	2,689	3,300	1,159	1986	1998	40
400 Commerce Drive	Newark	DE	—	2,528	9,220	1,086		2,528	10,306	12,834	3,911	1997	2002	40
100 Commerce Drive	Newark	DE	—	1,160	4,633	859		1,160	5,492	6,652	2,595	1989	1997	40
200 Commerce Drive	Newark	DE	—	911	4,414	1,018		911	5,432	6,343	2,180	1998	2002	40
Main Street - Plaza 1000	Voorhees	NJ	—	2,732	10,942	2,933		2,732	13,875	16,607	13,211	1988	1997	40
Main Street - Piazza	Voorhees	NJ	—	696	2,802	3,034		696	5,836	6,532	1,714	1990	1997	40
Main Street - Promenade	Voorhees	NJ	—	531	2,052	444		531	2,496	3,027	1,218	1988	1997	40
920 North King Street	Wilmington	DE	—	6,141	21,140	2,669		6,141	23,809	29,950	7,669	1989	2004	30
300 Delaware Avenue	Wilmington	DE	—	6,368	13,739	2,548		6,368	16,287	22,655	6,642	1989	2004	23
Two Righter Parkway	Wilmington	DE	—	2,802	11,217	6,172		2,802	17,389	20,191	4,822	1987	2001	40
One Righter Parkway	Wilmington	DE	—	2,545	10,195	5,864		2,545	16,059	18,604	8,839	1989	1996	40
RICHMOND
4364 South Alston Avenue	Durham	NC	—	1,622	6,419	1,357		1,581	7,817	9,398	3,174	1985	1998	40
4805 Lake Brooke Drive	Glen Allen	VA	—	1,640	6,567	1,537		1,640	8,104	9,744	3,243	1996	1998	40
Overlook I	Glen Allen	VA	—	748	3,976	599		790	4,533	5,323	677	1998	2011	40
Overlook II	Glen Allen	VA	—	748	4,492	364		790	4,814	5,604	671	2000	2011	40
2812 Emerywood Parkway	Henrico	VA	—	1,069	4,281	515		1,069	4,796	5,865	2,182	1980	1998	40
300 Arboretum Place	Richmond	VA	—	5,450	21,892	6,917		5,450	28,809	34,259	10,862	1988	1998	40
7501 Boulders View Drive	Richmond	VA	—	4,669	19,699	2,071		4,925	21,514	26,439	4,786	1989	2007	40
7300 Beaufont Springs Drive	Richmond	VA	—	4,672	19,689	2,857		4,922	22,296	27,218	4,223	2000	2007	40
6800 Paragon Place	Richmond	VA	—	4,552	18,414	2,163		4,552	20,577	25,129	4,651	1987	2006	40
6802 Paragon Place	Richmond	VA	—	2,917	11,454	3,143		2,917	14,597	17,514	5,312	1989	2002	40
1025 Boulders Parkway	Richmond	VA	—	2,574	11,297	1,704		2,824	12,751	15,575	2,545	1994	2007	40
2100-2116 West Laburnam Avenue	Richmond	VA	—	2,482	8,846	2,770		2,482	11,616	14,098	5,162	1984	1998	40
7401 Beaufont Springs Drive	Richmond	VA	—	2,349	10,396	1,011		2,599	11,157	13,756	2,289	1998	2007	40
7325 Beaufont Springs Drive	Richmond	VA	—	2,344	10,377	630		2,594	10,757	13,351	2,049	1999	2007	40

								Gross Amount at Which Carried
				Initial Cost				December 31, 2014
Property Name	City	State	Encumbrances at December 31, 2014(a)	Land	Building and Improvements	Net Improvements (Retirements) Since Acquisition		Land	Building and Improvements	Total (b)	Accumulated Depreciation at December 31, 2014 (c)	Year of Construction	Year Acquired	Depreciable Life
9011 Arboretum Parkway	Richmond	VA	—	1,857	7,702	940		1,857	8,642	10,499	3,854	1991	1998	40
6806 Paragon Place	Richmond	VA	—	—	10,288	(37	)	402	9,849	10,251	2,660	2007	2005	40
9100 Arboretum Parkway	Richmond	VA	—	1,362	5,489	979		1,362	6,468	7,830	2,807	1987	1998	40
2511 Brittons Hill Road	Richmond	VA	—	1,202	4,820	1,221		1,202	6,041	7,243	2,846	1987	1998	40
100 Gateway Centre Parkway	Richmond	VA	—	391	5,410	617		391	6,027	6,418	1,922	2001	1998	40
9200 Arboretum Parkway	Richmond	VA	—	985	3,973	1,252		985	5,225	6,210	2,348	1987	1998	40
9210 Arboretum Parkway	Richmond	VA	—	1,110	4,474	517		1,110	4,991	6,101	2,239	1988	1998	40
2201-2245 Tomlynn Street	Richmond	VA	—	1,020	4,067	1,046		1,020	5,113	6,133	2,154	1989	1998	40
9211 Arboretum Parkway	Richmond	VA	—	582	2,433	844		582	3,277	3,859	1,317	1991	1998	40
2221-2245 Dabney Road	Richmond	VA	—	530	2,123	359		530	2,482	3,012	990	1994	1998	40
2212-2224 Tomlynn Street	Richmond	VA	—	502	2,014	395		502	2,409	2,911	1,020	1985	1998	40
2244 Dabney Road	Richmond	VA	—	550	2,203	—		550	2,203	2,753	964	1993	1998	40
2277 Dabney Road	Richmond	VA	—	507	2,034	294		507	2,328	2,835	977	1986	1998	40
2248 Dabney Road	Richmond	VA	—	512	2,049	57		512	2,106	2,618	923	1989	1998	40
2161-2179 Tomlynn Street	Richmond	VA	—	423	1,695	315		423	2,010	2,433	842	1985	1998	40
2246 Dabney Road	Richmond	VA	—	455	1,822	—		455	1,822	2,277	797	1987	1998	40
2251 Dabney Road	Richmond	VA	—	387	1,552	95		387	1,647	2,034	738	1983	1998	40
2256 Dabney Road	Richmond	VA	—	356	1,427	182		356	1,609	1,965	751	1982	1998	40
2130-2146 Tomlynn Street	Richmond	VA	—	353	1,416	214		353	1,630	1,983	704	1988	1998	40
2112-2124 Tomlynn Street	Richmond	VA	—	281	1,125	300		281	1,425	1,706	625	1984	1998	40
2240 Dabney Road	Richmond	VA	—	264	1,059	88		264	1,147	1,411	478	1984	1998	40
Boulders Land	Richmond	VA	—	1,256	—	28		1,259	25	1,284	2	N/A	2007	N/A

CALIFORNIA
5900 & 5950 La Place Court	Carlsbad	CA	—		3,706		11,185		3,613		3,955		14,549		18,504		3,645		1988	2006	48
5963 La Place Court	Carlsbad	CA	—		2,824		9,413		2,117		2,999		11,355		14,354		2,486		1987	2006	55
2035 Corte Del Nogal	Carlsbad	CA	—		3,261		6,077		1,167		3,499		7,006		10,505		2,038		1991	2006	39
1200 Concord Avenue	Concord	CA	—		6,395		24,664		808		6,515		25,352		31,867		7,949		1984	2006	34
1220 Concord Avenue	Concord	CA	—		6,476		24,966		260		6,476		25,226		31,702		7,622		1984	2006	34
155 Grand Avenue	Oakland	CA	—		13,556		54,267		6,316		13,556		60,583		74,139		12,652		1990	2007	40
Two Kaiser Plaza	Oakland	CA	—		7,841		—		—		7,841		—		7,841		—		N/A	2006	N/A
Oakland Lot B	Oakland	CA	—		4,342		—		—		4,342		—		4,342		—		N/A	2006	N/A
	Total:		$	655,934	$	625,594	$	3,362,277	$	643,257	$	673,838	$	3,957,290	$	4,631,128	$	1,078,996

(a) Excludes the effect of any net interest premium / (discount).

(b) Reconciliation of Real Estate:

The following table reconciles the real estate investments from January 1, 2012 to December 31, 2014 (in thousands):

	2014			2013			2012
Balance at beginning of year	$	4,669,289		$	4,726,169		$	4,793,080
Additions:
Acquisitions	—			347,510			50,579
Capital expenditures and assets placed into service	132,149			109,740			90,619
Less:
Dispositions	(126,471		)	(474,275		)	(168,408		)
Retirements	(43,839		)	(39,855		)	(39,701		)
Balance at end of year	$	4,631,128		$	4,669,289		$	4,726,169
Less:
Assets held for sale (e)	27,436			—			—
Per consolidated balance sheet	$	4,603,692		$	4,669,289		$	4,726,169

The aggregate cost for federal income tax purposes is $3.7 billion as of December 31, 2014.

(c) Reconciliation of Accumulated Depreciation:

The following table reconciles the accumulated depreciation on real estate investments from January 1, 2012 to December 31, 2014 (in thousands):

	2014			2013			2012
Balance at beginning of year	$	983,808		$	954,665		$	865,710
Additions:
Depreciation expense — continuing operations	160,641			150,236			154,095
Depreciation expense — discontinued operations	—			9,164			2,143
Less:
Dispositions	(22,459		)	(91,890		)	(28,270		)
Retirements	(42,994		)	(38,367		)	(39,013		)
Balance at end of year	$	1,078,996		$	983,808		$	954,665
Less:
Assets held for sale (e)	(11,167		)	—			—
Per consolidated balance sheet	$	1,067,829		$	983,808		$	954,665

(d) This property was contributed to an unconsolidated real estate venture, however, the Company will continue to consolidate this property due to its continuing involvement in this property resulting from its ongoing lease at this property and its 50% ownership interest in the venture. Please see Note 3, "Real Estate Investments," to the consolidated financial statements for additional information.

(e) The office properties known as Atrium I, located at 1000 Atrium Way in Mt Laurel, New Jersey and Libertyview, located 457 Haddonfield Road in Cherry Hill, New Jersey, were categorized as held for sale as of December 31, 2014. For further information see Note 3, "Real Estate Investments."