Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2017

SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]

Real Estate and Accumulated Depreciation Disclosure [Text Block]

Item 15. Exhibits and Financial Statement Schedules

(a) Financial Statement Schedule

Boston Properties, Inc. Schedule III - Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
Property Name	Type	Location	Encumbrances		Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives  (Years)
					Land		Building
767 Fifth Avenue (the General Motors Building)	Office	New York, NY	$	2,267,041	$	1,796,252	$	1,532,654	$	135,559	$	1,796,252	$	1,668,213	$	—	$	—	$	3,464,465	$	222,981	1968	2013	(1)
Prudential Center	Office	Boston, MA	—		92,077		948,357		501,709		115,638		1,426,505		—		—		1,542,143		511,605		1965/1993/2002/2016-2017	1998/1999/2000	(1)
Embarcadero Center	Office	San Francisco, CA	—		179,697		847,410		366,780		195,987		1,197,900		—		—		1,393,887		596,100		1970/1989	1998-1999	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		181,418		354,107		866,869		—		—		1,220,976		310,262		1961	2002	(1)
601 Lexington Avenue	Office	New York, NY	672,142		241,600		494,782		290,590		289,639		634,134		—		103,199		1,026,972		254,932		1977/1997	2001	(1)
200 Clarendon Street and Garage	Office	Boston, MA	—		219,543		667,884		139,189		219,616		799,991		7,009		—		1,026,616		161,471		1976	2010	(1)
250 West 55th Street	Office	New York, NY	—		285,263		603,167		43,296		285,263		646,463		—		—		931,726		72,058		2014	2007	(1)
Carnegie Center	Office	Princeton, NJ	—		107,997		389,359		157,960		108,948		543,514		2,854		—		655,316		228,171		1983-2016	1998/1999/2000/2007/2014/2017	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		79,035		131,067		514,989		—		—		646,056		97,630		1971-1975/2017	2012	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		87,050		169,193		463,708		—		—		632,901		191,435		2004	2000	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		17,473		63,988		472,010		—		—		535,998		101,525		2011	2007	(1)
Fountain Square	Office	Reston, VA	—		56,853		306,298		17,834		56,853		320,474		3,658		—		380,985		60,098		1986-1990	2012	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		23,875		103,000		277,540		—		—		380,540		54,056		2012	2010	(1)
599 Lexington Avenue	Office	New York, NY	—		81,040		100,507		165,350		87,852		259,045		—		—		346,897		165,739		1986	1997	(1)
680 Folsom Street	Office	San Francisco, CA	—		72,545		219,766		7,545		72,545		227,311		—		—		299,856		30,577		2014	2012	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		14,991		13,687		252,386		—		—		266,073		87,711		2008-2009	2003	(1)
601 Massachusetts Avenue	Office	Washington, DC	—		95,310		165,173		2,353		95,322		167,514		—		—		262,836		12,177		2016	2008	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		73,418		18,789		221,869		—		—		240,658		57,320		1985-1989	2011	(1)
Gateway Center	Office	San Francisco, CA	—		28,255		139,245		59,019		30,627		195,892		—		—		226,519		102,634		1984/1986/2002	1999	(1)
535 Mission Street	Office	San Francisco, CA	—		40,933		148,378		3,259		40,933		151,637		—		—		192,570		14,637		2015	2013	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		4,907		—		188,448		—		—		188,448		46,780		2011	2008	(1)
Mountain View Research Park	Office	Mountain View, CA	—		95,066		68,373		8,136		95,066		76,509		—		—		171,575		15,146		1977-1981/2007-2013	2013	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		104,124		43,255		20,108		145,876		—		—		165,984		66,230		1955/1987/2017	1997/1998	(1)
1330 Connecticut Avenue	Office	Washington, DC	—		25,982		82,311		32,839		27,135		113,997		—		—		141,132		22,530		1984	2004	(1)
1333 New Hampshire Avenue	Office	Washington, DC	—		34,032		85,660		11,473		35,382		95,783		—		—		131,165		40,499		1996	2003	(1)
Kingstowne Towne Center	Office	Alexandria, VA	—		18,021		109,038		1,371		18,062		110,368		—		—		128,430		39,048		2003-2006	2007	(1)

Boston Properties, Inc. Schedule III - Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
Property Name	Type	Location	Encumbrances	Original		Costs Capitalized Subsequent to Acquisition		Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives  (Years)
				Land	Building
One Freedom Square	Office	Reston, VA	—	9,929	84,504	32,618		11,293	115,758	—	—	127,051	50,313	2000	2003	(1)
Capital Gallery	Office	Washington, DC	—	4,725	29,565	89,514		8,662	115,142	—	—	123,804	66,009	1981/2006	2007	(1)
Weston Corporate Center	Office	Weston, MA	—	25,753	92,312	(123	)	25,854	92,088	—	—	117,942	23,125	2010	2001	(1)
Two Freedom Square	Office	Reston, VA	—	13,930	77,739	23,379		15,420	99,628	—	—	115,048	47,936	2001	2003	(1)
One and Two Reston Overlook	Office	Reston, VA	—	16,456	66,192	25,111		16,179	91,580	—	—	107,759	44,626	1999	2000	(1)
Discovery Square	Office	Reston, VA	—	11,198	71,782	24,414		12,533	94,861	—	—	107,394	43,184	2001	2003	(1)
140 Kendrick Street	Office	Needham, MA	—	18,095	66,905	17,492		19,092	83,400	—	—	102,492	29,013	2000	2004	(1)
355 Main Street	Office	Cambridge, MA	—	18,863	53,346	27,450		21,173	78,486	—	—	99,659	26,915	1981/1996/2013	2006	(1)
10 CityPoint	Office	Waltham, MA	—	1,953	85,752	2,833		2,116	88,422	—	—	90,538	4,673	2016	1997	(1)
90 Broadway	Office	Cambridge, MA	—	19,104	52,078	17,180		20,785	67,577	—	—	88,362	19,254	1983/1998/2013	2006	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	25,236		13,593	74,655	—	—	88,248	26,562	1992	2005	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	11,030		11,097	71,012	—	—	82,109	30,036	2003	1999	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	5,703		13,873	66,060	—	—	79,933	23,044	2008	2001	(1)
3625-3635 Peterson Way	Office	Santa Clara, CA	—	63,206	14,879	138		63,206	14,879	138	—	78,223	5,120	1979	2016	(1)
North First Business Park	Office	San Jose, CA	—	58,402	13,069	4,416		23,377	16,600	35,910	—	75,887	15,839	1981	2007	(1)
300 Binney Street	Office	Cambridge, MA	—	18,080	51,262	140		18,080	51,402	—	—	69,482	7,755	2013	2009	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	1,287		16,741	52,572	—	—	69,313	10,790	1987/2003	2011	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	14,907		—	68,256	—	—	68,256	19,775	2009	2004	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	6,236		10,148	56,080	—	—	66,228	26,769	1984	1998	(1)
New Dominion Technology Park, Bldg. Two	Office	Herndon, VA	—	5,584	51,868	4,157		6,510	55,099	—	—	61,609	23,652	2004	1998	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	10,673		16,813	34,991	—	—	51,804	21,140	1999	1997	(1)
New Dominion Technology Park, Bldg. One	Office	Herndon, VA	32,691	3,880	43,227	3,882		4,583	46,406	—	—	50,989	25,940	2001	1998	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	19,000		1,478	46,891	—	—	48,369	23,570	1985	1999	(1)
255 Main Street	Office	Cambridge, MA	—	134	25,110	21,583		548	46,279	—	—	46,827	28,250	1987	1997	(1)
University Place	Office	Cambridge, MA	7,407	—	37,091	9,007		390	45,708	—	—	46,098	26,295	1985	1998	(1)
2600 Tower Oaks Boulevard	Office	Rockville, MD	—	4,243	31,125	9,867		4,785	40,450	—	—	45,235	21,020	2001	1998	(1)
Quorum Office Park	Office	Chelmsford, MA	—	3,750	32,454	5,813		5,187	36,830	—	—	42,017	16,594	2001	2000	(1)
500 E Street	Office	Washington, DC	—	109	22,420	14,743		2,379	34,893	—	—	37,272	23,781	1987	1997	(1)
150 Broadway	Office	Cambridge, MA	—	850	25,042	8,540		1,323	33,109	—	—	34,432	16,933	1999	1997	(1)
325 Main Street	Office	Cambridge, MA	—	174	12,200	11,963		965	23,372	—	—	24,337	12,852	1987/2013	1997	(1)
105 Broadway	Office	Cambridge, MA	—	1,299	12,943	8,214		2,395	20,061	—	—	22,456	13,493	1990	1997	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	18,219		1,264	19,379	—	—	20,643	13,404	1982	1997	(1)
201 Spring Street	Office	Lexington, MA	—	2,849	15,303	694		3,124	15,722	—	—	18,846	7,931	1997	1997	(1)
The Point	Office	Waltham, MA	—	6,395	10,040	409		6,480	10,364	—	—	16,844	714	2015	2007	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—	594	6,748	8,181		802	14,721	—	—	15,523	12,495	1985	1997	(1)
91 Hartwell Avenue	Office	Lexington, MA	—	784	6,464	8,269		941	14,576	—	—	15,517	9,849	1985	1997	(1)

Boston Properties, Inc. Schedule III - Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
Property Name	Type	Location	Encumbrances	Original		Costs Capitalized Subsequent to Acquisition	Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives  (Years)
				Land	Building
690 Folsom Street	Office	San Francisco, CA	—	3,219	11,038	1,157	3,219	12,195	—	—	15,414	1,295	2015	2012	(1)
181 Spring Street	Office	Lexington, MA	—	1,066	9,520	2,318	1,160	11,744	—	—	12,904	5,194	1999	1997	(1)
195 West Street	Office	Waltham, MA	—	1,611	6,652	4,340	1,858	10,745	—	—	12,603	7,963	1990	1997	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	8,381	425	11,456	—	—	11,881	8,211	1979	1997	(1)
7501 Boston Boulevard, Building Seven	Office	Springfield, VA	—	665	9,273	819	791	9,966	—	—	10,757	4,848	1997	1997	(1)
7435 Boston Boulevard, Building One	Office	Springfield, VA	—	392	3,822	3,997	659	7,552	—	—	8,211	5,510	1982	1997	(1)
250 Binney Street	Office	Cambridge, MA	—	110	4,483	3,593	273	7,913	—	—	8,186	5,066	1983	1997	(1)
8000 Grainger Court, Building Five	Office	Springfield, VA	—	366	4,282	3,375	601	7,422	—	—	8,023	5,644	1984	1997	(1)
7450 Boston Boulevard, Building Three	Office	Springfield, VA	—	1,165	4,681	1,773	1,430	6,189	—	—	7,619	3,451	1987	1998	(1)
453 Ravendale Drive	Office	Mountain View, CA	—	5,477	1,090	408	5,477	1,498	—	—	6,975	472	1977	2012	(1)
17 Hartwell Avenue	Office	Lexington, MA	—	26	150	6,252	65	6,363	—	—	6,428	1,098	1968	1997	(1)
7601 Boston Boulevard, Building Eight	Office	Springfield, VA	—	200	878	5,052	551	5,579	—	—	6,130	4,263	1986	1997	(1)
7300 Boston Boulevard, Building Thirteen	Office	Springfield, VA	—	608	4,773	709	661	5,429	—	—	6,090	2,785	2002	1997	(1)
7500 Boston Boulevard, Building Six	Office	Springfield, VA	—	138	3,749	1,655	406	5,136	—	—	5,542	3,965	1985	1997	(1)
8000 Corporate Court, Building Eleven	Office	Springfield, VA	—	136	3,071	1,596	774	4,029	—	—	4,803	2,909	1989	1997	(1)
7374 Boston Boulevard, Building Four	Office	Springfield, VA	—	241	1,605	1,913	398	3,361	—	—	3,759	2,578	1984	1997	(1)
7375 Boston Boulevard, Building Ten	Office	Springfield, VA	—	23	2,685	938	93	3,553	—	—	3,646	2,570	1988	1997	(1)
7451 Boston Boulevard, Building Two	Office	Springfield, VA	—	249	1,542	1,659	613	2,837	—	—	3,450	2,429	1982	1997	(1)
32 Hartwell Avenue	Office	Lexington, MA	—	168	1,943	1,012	314	2,809	—	—	3,123	1,974	1968/1979/1987	1997	(1)
164 Lexington Road	Office	Billerica, MA	—	592	1,370	319	643	1,638	—	—	2,281	868	1982	1997	(1)
The Avant at Reston Town Center	Residential	Reston, VA	—	20,350	91,995	830	20,350	92,825	—	—	113,175	9,780	2014	2010	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—	3,529	54,891	1,768	3,529	56,659	—	—	60,188	9,622	2011	2007	(1)
Boston Marriott Cambridge	Hotel	Cambridge, MA	—	478	37,918	38,799	1,201	75,994	—	—	77,195	47,753	1986	1997	(1)
Kendall Center Green Garage	Garage	Cambridge, MA	—	—	35,035	7,448	103	42,380	—	—	42,483	10,779	1984	2006	(1)
Kendall Center Yellow Garage	Garage	Cambridge, MA	—	1,256	15,697	1,621	1,434	17,140	—	—	18,574	5,181	2006	2004	(1)
Kendall Center Blue Garage	Garage	Cambridge, MA	—	1,163	11,633	2,283	1,579	13,500	—	—	15,079	9,209	1990	1997	(1)
Salesforce Tower	Development	San Francisco, CA	—	—	—	947,106	200,349	55,318	—	691,439	947,106	116	N/A	2013	N/A
Signature at Reston	Development	Reston, VA	—	—	—	203,650	—	—	—	203,650	203,650	—	N/A	2013	N/A
Proto Kendall Square	Development	Cambridge, MA	—	—	—	82,905	—	—	—	82,905	82,905	—	N/A	2015	N/A
145 Broadway	Development	Cambridge, MA	—	121	—	79,979	324	—	—	79,776	80,100	—	NA	1997	N/A
191 Spring Street	Development	Lexington, MA	—	2,850	27,166	35,174	3,151	46,288	—	15,751	65,190	19,034	1971/1995	1997	(1)

Boston Properties, Inc. Schedule III - Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
Property Name	Type	Location	Encumbrances				Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development				Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives  (Years)
							Land		Building
6595 Springfield Center Drive (TSA Headquarters)	Development	Springfield, VA	—				—		—		41,918		—		—		—				41,918		41,918		—		N/A	2007	N/A
MacArthur Station Residences	Development	Oakland, CA	—				—		—		37,644		—		—		—				37,644		37,644		—		N/A	N/A	N/A
20 CityPoint	Development	Waltham, MA	—				—		—		13,056		—		—		—				13,056		13,056		—		N/A	2007	N/A
Tower Oaks Master Plan	Land	Rockville, MD	—				—		—		29,419		—		—		29,419				—		29,419		—		N/A	1998	N/A
Plaza at Almaden	Land	San Jose, CA	—				—		—		29,085		—		—		29,085				—		29,085		—		N/A	2006	N/A
Springfield Metro Center	Land	Springfield, VA	—				—		—		19,684		—		—		19,684				—		19,684		—		N/A	2007	N/A
214 Third Avenue	Land	Waltham, MA	—				—		—		13,815		—		—		13,815				—		13,815		—		N/A	2006	N/A
Reston Gateway	Land	Reston, VA	—				—		—		13,730		—		—		13,730				—		13,730		—		N/A	1998	N/A
103 Fourth Avenue	Land	Waltham, MA	—				—		—		12,115		—		—		12,115				—		12,115		—		N/A	2007	N/A
Crane Meadow	Land	Marlborough, MA	—				—		—		8,836		—		—		8,836				—		8,836		—		N/A	2000	N/A
Washingtonian North	Land	Gaithersburg, MD	—				—		—		7,645		—		—		7,645				—		7,645		—		N/A	1998	N/A
2100 Pennsylvania Avenue	Land	Washington, DC	—				—		—		6,543		—		—		6,543				—		6,543		—		N/A	N/A	N/A
Fourth and Harrison	Land	San Francisco, CA	—				—		—		5,659		—		—		5,659				—		5,659		—		N/A	N/A	N/A
North First Master Plan	Land	San Jose, CA	—				—		—		3,018		—		—		3,018				—		3,018		—		N/A	2007	N/A
Broad Run Business Park	Land	Loudoun County, VA	—				—		—		2,367		—		—		2,367				—		2,367		—		N/A	1998	N/A
Kendall Center Master Plan	Land	Cambridge, MA	—				—		—		2,207		—		—		2,207				—		2,207		—		N/A	N/A	N/A
Weston Quarry	Land	Weston, MA	—				—		—		1,194		—		—		1,194				—		1,194		—		N/A	2001	N/A
Reston Overlook Master Plan	Land	Reston, VA	—				—		—		39		—		—		39				—		39		—		N/A	2000	N/A
			$	2,979,281	(2	)	$	4,762,002	$	11,634,050	$	4,662,662	$	5,080,679	$	14,503,772	$	204,925	(3	)	$	1,269,338	$	21,058,714	$	4,566,570

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $37,928. Accumulated Depreciation does not include approximately $23,064 of accumulated depreciation related to Furniture, Fixtures and Equipment.

The aggregate cost and accumulated depreciation for tax purposes was approximately $17.3 billion and $3.6 billion, respectively.

(1) Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2) Includes unamortized deferred financing costs totaling approximately $(34.7) million.

(3) Includes pre-development costs.

Boston Properties, Inc.

Real Estate and Accumulated Depreciation

December 31, 2017, 2016 and 2015

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2017			2016			2015
Real Estate:
Balance at the beginning of the year	$	20,114,576		$	19,451,683		$	19,208,417
Additions to/improvements of real estate	1,099,286			977,287			700,792
Assets sold/written-off	(155,148		)	(314,394		)	$	(457,526	)
Balance at the end of the year	$	21,058,714		$	20,114,576		$	19,451,683
Accumulated Depreciation:
Balance at the beginning of the year	$	4,201,891		$	3,905,940		$	3,529,978
Depreciation expense	497,059			560,024			486,450
Assets sold/written-off	(132,380		)	(264,073		)	(110,488		)
Balance at the end of the year	$	4,566,570		$	4,201,891		$	3,905,940

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.

Boston Properties Limited Partnership

SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]

Real Estate and Accumulated Depreciation Disclosure [Text Block]

Boston Properties Limited Partnership Schedule III—Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
					Original				Costs Capitalized Subsequent to Acquisition			Land and Improvements		Building and Improvements		Land Held for Development		Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances		Land		Building
767 Fifth Avenue (the General Motors Building)	Office	New York, NY	$	2,267,041	$	1,796,252	$	1,532,654	$	135,559		$	1,796,252	$	1,668,213	$	—	$	—	$	3,464,465	$	222,981	1968	2013	(1)
Prudential Center	Office	Boston, MA	—		92,077		948,357		441,339			100,540		1,381,233		—		—		1,481,773		497,960		1965/1993/2002/2016-2017	1998/1999/2000	(1)
Embarcadero Center	Office	San Francisco, CA	—		179,697		847,410		304,399			180,420		1,151,086		—		—		1,331,506		581,932		1970/1989	1998-1999	(1)
399 Park Avenue	Office	New York, NY	—		339,200		700,358		121,810			339,200		822,168		—		—		1,161,368		296,763		1961	2002	(1)
200 Clarendon Street and Garage	Office	Boston, MA	—		219,543		667,884		139,189			219,616		799,991		7,009		—		1,026,616		161,471		1976	2010	(1)
601 Lexington Avenue	Office	New York, NY	672,142		241,600		494,782		253,504			279,281		607,406		—		103,199		989,886		246,814		1977/1997	2001	(1)
250 West 55th Street	Office	New York, NY	—		285,263		603,167		43,296			285,263		646,463		—		—		931,726		72,058		2014	2007	(1)
100 Federal Street	Office	Boston, MA	—		131,067		435,954		79,035			131,067		514,989		—		—		646,056		97,630		1971-1975/2017	2012	(1)
Carnegie Center	Office	Princeton, NJ	—		107,997		389,359		140,642			104,617		530,527		2,854		—		637,998		224,256		1983-2016	1998/1999/2000/2007/2014/2017	(1)
Times Square Tower	Office	New York, NY	—		165,413		380,438		49,071			159,694		435,228		—		—		594,922		182,850		2004	2000	(1)
Atlantic Wharf	Office	Boston, MA	—		63,988		454,537		17,473			63,988		472,010		—		—		535,998		101,525		2011	2007	(1)
Fountain Square	Office	Reston, VA	—		56,853		306,298		17,834			56,853		320,474		3,658		—		380,985		60,098		1986-1990	2012	(1)
510 Madison Avenue	Office	New York, NY	—		103,000		253,665		23,875			103,000		277,540		—		—		380,540		54,056		2012	2010	(1)
599 Lexington Avenue	Office	New York, NY	—		81,040		100,507		138,108			81,040		238,615		—		—		319,655		159,586		1986	1997	(1)
680 Folsom Street	Office	San Francisco, CA	—		72,545		219,766		7,545			72,545		227,311		—		—		299,856		30,577		2014	2012	(1)
South of Market and Democracy Tower	Office	Reston, VA	—		13,603		237,479		14,655			13,603		252,134		—		—		265,737		87,651		2008-2009	2003	(1)
601 Massachusetts Avenue	Office	Washington, DC	—		95,310		165,173		2,341			95,310		167,514		—		—		262,824		12,177		2016	2008	(1)
Bay Colony Corporate Center	Office	Waltham, MA	—		18,789		148,451		73,418			18,789		221,869		—		—		240,658		57,320		1985-1989	2011	(1)
Gateway Center	Office	San Francisco, CA	—		28,255		139,245		52,630			29,029		191,101		—		—		220,130		101,191		1984/1986/2002	1999	(1)
535 Mission Street	Office	San Francisco, CA	—		40,933		148,378		3,259			40,933		151,637		—		—		192,570		14,637		2015	2013	(1)
2200 Pennsylvania Avenue	Office	Washington, DC	—		—		183,541		4,907			—		188,448		—		—		188,448		46,780		2011	2008	(1)
Mountain View Research Park	Office	Mountain View, CA	—		95,066		68,373		8,136			95,066		76,509		—		—		171,575		15,146		1977-1981/2007-2013	2013	(1)
Reservoir Place	Office	Waltham, MA	—		18,605		104,124		39,180			19,089		142,820		—		—		161,909		65,309		1955/1987/2017	1997/1998	(1)
1330 Connecticut Avenue	Office	Washington, DC	—		25,982		82,311		28,226			25,982		110,537		—		—		136,519		21,484		1984	2004	(1)
Kingstowne Towne Center	Office	Alexandria, VA	—		18,021		109,038		1,207			18,021		110,245		—		—		128,266		39,018		2003-2006	2007	(1)
1333 New Hampshire Avenue	Office	Washington, DC	—		34,032		85,660		6,079			34,032		91,739		—		—		125,771		39,279		1996	2003	(1)
One Freedom Square	Office	Reston, VA	—		9,929		84,504		26,981			9,883		111,531		—		—		121,414		49,037		2000	2003	(1)
Weston Corporate Center	Office	Weston, MA	—		25,753		92,312		(123		)	25,854		92,088		—		—		117,942		23,125		2010	2001	(1)
Capital Gallery	Office	Washington, DC	—		4,725		29,565		79,383			6,128		107,545		—		—		113,673		63,717		1981/2006	2007	(1)
Two Freedom Square	Office	Reston, VA	—		13,930		77,739		17,167			13,866		94,970		—		—		108,836		46,532		2001	2003	(1)
One and Two Reston Overlook	Office	Reston, VA	—		16,456		66,192		20,693			15,074		88,267		—		—		103,341		43,627		1999	2000	(1)

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
				Original		Costs Capitalized Subsequent to Acquisition		Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances	Land	Building
Discovery Square	Office	Reston, VA	—	11,198	71,782	18,869		11,146	90,703	—	—	101,849	41,928	2001	2003	(1)
355 Main Street	Office	Cambridge, MA	—	18,863	53,346	27,152		21,098	78,263	—	—	99,361	26,850	1981/1996/2013	2006	(1)
140 Kendrick Street	Office	Needham, MA	—	18,095	66,905	13,502		18,095	80,407	—	—	98,502	28,111	2000	2004	(1)
10 CityPoint	Office	Waltham, MA	—	1,953	85,752	2,670		1,953	88,422	—	—	90,375	4,673	2016	1997	(1)
90 Broadway	Office	Cambridge, MA	—	19,104	52,078	17,001		20,741	67,442	—	—	88,183	19,220	1983/1998/2013	2006	(1)
230 CityPoint	Office	Waltham, MA	—	13,189	49,823	23,619		13,189	73,442	—	—	86,631	26,200	1992	2005	(1)
77 CityPoint	Office	Waltham, MA	—	13,847	60,383	5,598		13,847	65,981	—	—	79,828	23,024	2008	2001	(1)
Waltham Weston Corporate Center	Office	Waltham, MA	—	10,385	60,694	8,043		10,350	68,772	—	—	79,122	29,359	2003	1999	(1)
3625-3635 Peterson Way	Office	Santa Clara, CA	—	63,206	14,879	138		63,206	14,879	138	—	78,223	5,120	1979	2016	(1)
North First Business Park	Office	San Jose, CA	—	58,402	13,069	4,393		23,371	16,583	35,910	—	75,864	15,839	1981	2007	(1)
300 Binney Street	Office	Cambridge, MA	—	18,080	51,262	140		18,080	51,402	—	—	69,482	7,755	2013	2009	(1)
2440 West El Camino Real	Office	Mountain View, CA	—	16,741	51,285	1,287		16,741	52,572	—	—	69,313	10,790	1987/2003	2011	(1)
Wisconsin Place	Office	Chevy Chase, MD	—	—	53,349	14,907		—	68,256	—	—	68,256	19,775	2009	2004	(1)
Reston Corporate Center	Office	Reston, VA	—	9,135	50,857	3,625		9,496	54,121	—	—	63,617	26,178	1984	1998	(1)
New Dominion Technology Park, Bldg. Two	Office	Herndon, VA	—	5,584	51,868	412		5,574	52,290	—	—	57,864	22,801	2004	1998	(1)
200 West Street	Office	Waltham, MA	—	16,148	24,983	8,012		16,148	32,995	—	—	49,143	20,538	1999	1997	(1)
New Dominion Technology Park, Bldg. One	Office	Herndon, VA	32,691	3,880	43,227	1,072		3,880	44,299	—	—	48,179	25,304	2001	1998	(1)
Sumner Square	Office	Washington, DC	—	624	28,745	16,920		958	45,331	—	—	46,289	23,103	1985	1999	(1)
255 Main Street	Office	Cambridge, MA	—	134	25,110	19,927		134	45,037	—	—	45,171	27,878	1987	1997	(1)
University Place	Office	Cambridge, MA	7,407	—	37,091	7,557		27	44,621	—	—	44,648	25,971	1985	1998	(1)
2600 Tower Oaks Boulevard	Office	Rockville, MD	—	4,243	31,125	7,704		4,244	38,828	—	—	43,072	20,529	2001	1998	(1)
Quorum Office Park	Office	Chelmsford, MA	—	3,750	32,454	4,115		4,762	35,557	—	—	40,319	16,211	2001	2000	(1)
500 E Street	Office	Washington, DC	—	109	22,420	11,503		1,569	32,463	—	—	34,032	23,051	1987	1997	(1)
150 Broadway	Office	Cambridge, MA	—	850	25,042	6,535		822	31,605	—	—	32,427	16,477	1999	1997	(1)
325 Main Street	Office	Cambridge, MA	—	174	12,200	11,192		772	22,794	—	—	23,566	12,675	1987/2013	1997	(1)
105 Broadway	Office	Cambridge, MA	—	1,299	12,943	6,108		1,868	18,482	—	—	20,350	13,015	1990	1997	(1)
Lexington Office Park	Office	Lexington, MA	—	998	1,426	17,455		1,073	18,806	—	—	19,879	13,235	1982	1997	(1)
201 Spring Street	Office	Lexington, MA	—	2,849	15,303	(405	)	2,849	14,898	—	—	17,747	7,681	1997	1997	(1)
The Point	Office	Waltham, MA	—	6,395	10,040	409		6,480	10,364	—	—	16,844	714	2015	2007	(1)
690 Folsom Street	Office	San Francisco, CA	—	3,219	11,038	1,157		3,219	12,195	—	—	15,414	1,295	2015	2012	(1)
91 Hartwell Avenue	Office	Lexington, MA	—	784	6,464	7,642		784	14,106	—	—	14,890	9,705	1985	1997	(1)
92-100 Hayden Avenue	Office	Lexington, MA	—	594	6,748	7,452		619	14,175	—	—	14,794	12,329	1985	1997	(1)
181 Spring Street	Office	Lexington, MA	—	1,066	9,520	1,941		1,066	11,461	—	—	12,527	5,109	1999	1997	(1)
195 West Street	Office	Waltham, MA	—	1,611	6,652	3,351		1,611	10,003	—	—	11,614	7,736	1990	1997	(1)
33 Hayden Avenue	Office	Lexington, MA	—	266	3,234	7,744		266	10,978	—	—	11,244	8,067	1979	1997	(1)

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
				Original		Costs Capitalized Subsequent to Acquisition	Land and Improvements	Building and Improvements	Land Held for Development	Development and Construction in Progress	Total	Accumulated Depreciation	Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances	Land	Building
7501 Boston Boulevard, Building Seven	Office	Springfield, VA	—	665	9,273	314	665	9,587	—	—	10,252	4,732	1997	1997	(1)
250 Binney Street	Office	Cambridge, MA	—	110	4,483	2,939	110	7,422	—	—	7,532	4,922	1983	1997	(1)
7435 Boston Boulevard, Building One	Office	Springfield, VA	—	392	3,822	3,304	486	7,032	—	—	7,518	5,354	1982	1997	(1)
8000 Grainger Court, Building Five	Office	Springfield, VA	—	366	4,282	2,781	453	6,976	—	—	7,429	5,511	1984	1997	(1)
7450 Boston Boulevard, Building Three	Office	Springfield, VA	—	1,165	4,681	1,359	1,327	5,878	—	—	7,205	3,354	1987	1998	(1)
453 Ravendale Drive	Office	Mountain View, CA	—	5,477	1,090	408	5,477	1,498	—	—	6,975	472	1977	2012	(1)
17 Hartwell Avenue	Office	Lexington, MA	—	26	150	6,095	26	6,245	—	—	6,271	1,062	1968	1997	(1)
7300 Boston Boulevard, Building Thirteen	Office	Springfield, VA	—	608	4,773	497	608	5,270	—	—	5,878	2,737	2002	1997	(1)
7601 Boston Boulevard, Building Eight	Office	Springfield, VA	—	200	878	4,359	378	5,059	—	—	5,437	4,107	1986	1997	(1)
7500 Boston Boulevard, Building Six	Office	Springfield, VA	—	138	3,749	1,122	273	4,736	—	—	5,009	3,845	1985	1997	(1)
8000 Corporate Court, Building Eleven	Office	Springfield, VA	—	136	3,071	1,245	686	3,766	—	—	4,452	2,826	1989	1997	(1)
7375 Boston Boulevard, Building Ten	Office	Springfield, VA	—	23	2,685	757	47	3,418	—	—	3,465	2,532	1988	1997	(1)
7374 Boston Boulevard, Building Four	Office	Springfield, VA	—	241	1,605	1,530	303	3,073	—	—	3,376	2,494	1984	1997	(1)
7451 Boston Boulevard, Building Two	Office	Springfield, VA	—	249	1,542	1,346	535	2,602	—	—	3,137	2,357	1982	1997	(1)
32 Hartwell Avenue	Office	Lexington, MA	—	168	1,943	426	168	2,369	—	—	2,537	1,840	1968/1979/1987	1997	(1)
164 Lexington Road	Office	Billerica, MA	—	592	1,370	117	592	1,487	—	—	2,079	819	1982	1997	(1)
The Avant at Reston Town Center	Residential	Reston, VA	—	20,350	91,995	830	20,350	92,825	—	—	113,175	9,780	2014	2010	(1)
The Lofts at Atlantic Wharf	Residential	Boston, MA	—	3,529	54,891	1,768	3,529	56,659	—	—	60,188	9,622	2011	2007	(1)
Boston Marriott Cambridge	Hotel	Cambridge, MA	—	478	37,918	35,908	478	73,826	—	—	74,304	47,101	1986	1997	(1)
Kendall Center Green Garage	Garage	Cambridge, MA	—	—	35,035	7,034	—	42,069	—	—	42,069	10,687	1984	2006	(1)
Kendall Center Yellow Garage	Garage	Cambridge, MA	—	1,256	15,697	909	1,256	16,606	—	—	17,862	5,024	2006	2004	(1)
Kendall Center Blue Garage	Garage	Cambridge, MA	—	1,163	11,633	618	1,163	12,251	—	—	13,414	8,834	1990	1997	(1)
Salesforce Tower	Development	San Francisco, CA	—	—	—	947,106	200,349	55,318	—	691,439	947,106	116	N/A	2013	N/A
Signature at Reston	Development	Reston, VA	—	—	—	203,650	—	—	—	203,650	203,650	—	N/A	2013	N/A
Proto Kendall Square	Development	Cambridge, MA	—	—	—	82,905	—	—	—	82,905	82,905	—	N/A	2015	N/A
145 Broadway	Development	Cambridge, MA	—	121	—	79,776	121	—	—	79,776	79,897	—	NA	1997	N/A
191 Spring Street	Development	Lexington, MA	—	2,850	27,166	34,542	2,850	45,957	—	15,751	64,558	18,934	1971/1995	1997	(1)
6595 Springfield Center Drive (TSA Headquarters)	Development	Springfield, VA	—	—	—	41,918	—	—	—	41,918	41,918	—	N/A	2007	N/A

Boston Properties Limited Partnership Schedule 3—Real Estate and Accumulated Depreciation December 31, 2017 (dollars in thousands)
							Original				Costs Capitalized Subsequent to Acquisition		Land and Improvements		Building and Improvements		Land Held for Development				Development and Construction in Progress		Total		Accumulated Depreciation		Year(s) Built/ Renovated	Year(s) Acquired	Depreciable Lives (Years)
Property Name	Type	Location	Encumbrances				Land		Building
MacArthur Station Residences	Development	Oakland, CA	—				—		—		37,644		—		—		—				37,644		37,644		—		N/A	N/A	N/A
20 CityPoint	Development	Waltham, MA	—				—		—		13,056		—		—		—				13,056		13,056		—		N/A	2007	N/A
Tower Oaks Master Plan	Land	Rockville, MD	—				—		—		29,419		—		—		29,419				—		29,419		—		N/A	1998	N/A
Plaza at Almaden	Land	San Jose, CA	—				—		—		29,085		—		—		29,085				—		29,085		—		N/A	2006	N/A
Springfield Metro Center	Land	Springfield, VA	—				—		—		19,684		—		—		19,684				—		19,684		—		N/A	2007	N/A
214 Third Avenue	Land	Waltham, MA	—				—		—		13,815		—		—		13,815				—		13,815		—		N/A	2006	N/A
Reston Gateway	Land	Reston, VA	—				—		—		13,730		—		—		13,730				—		13,730		—		N/A	1998	N/A
103 Fourth Avenue	Land	Waltham, MA	—				—		—		12,115		—		—		12,115				—		12,115		—		N/A	2007	N/A
Crane Meadow	Land	Marlborough, MA	—				—		—		8,836		—		—		8,836				—		8,836		—		N/A	2000	N/A
Washingtonian North	Land	Gaithersburg, MD	—				—		—		7,645		—		—		7,645				—		7,645		—		N/A	1998	N/A
2100 Pennsylvania Avenue	Land	Washington, DC	—				—		—		6,543		—		—		6,543				—		6,543		—		N/A	N/A	N/A
Fourth and Harrison	Land	San Francisco, CA	—				—		—		5,659		—		—		5,659				—		5,659		—		N/A	N/A	N/A
North First Master Plan	Land	San Jose, CA	—				—		—		3,018		—		—		3,018				—		3,018		—		N/A	2007	N/A
Broad Run Business Park	Land	Loudoun County, VA	—				—		—		2,367		—		—		2,367				—		2,367		—		N/A	1998	N/A
Kendall Center Master Plan	Land	Cambridge, MA	—				—		—		2,207		—		—		2,207				—		2,207		—		N/A	N/A	N/A
Weston Quarry	Land	Weston, MA	—				—		—		1,194		—		—		1,194				—		1,194		—		N/A	2001	N/A
Reston Overlook Master Plan	Land	Reston, VA	—				—		—		39		—		—		39				—		39		—		N/A	2000	N/A
			$	2,979,281	(2	)	$	4,762,002	$	11,634,050	$	4,251,184	$	4,976,303	$	14,196,670	$	204,925	(3	)	$	1,269,338	$	20,647,236	$	4,473,895

Note: Total Real Estate does not include Furniture, Fixtures and Equipment totaling approximately $37,928. Accumulated Depreciation does not include approximately $23,064 of accumulated depreciation related to Furniture, Fixtures and Equipment.

The aggregate cost and accumulated depreciation for tax purposes was approximately $19.3 billion and $4.1 billion, respectively.

(1) Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

(2) Includes unamortized deferred financing costs totaling approximately $(34.7) million.

(3) Includes pre-development costs.

Boston Properties Limited Partnership

Real Estate and Accumulated Depreciation

December 31, 2017, 2016 and 2015

(dollars in thousands)

A summary of activity for real estate and accumulated depreciation is as follows:

	2017			2016			2015
Real Estate:
Balance at the beginning of the year	$	19,701,185		$	19,031,289		$	18,786,572
Additions to/improvements of real estate	1,099,286			977,287			700,792
Assets sold/written-off	(153,235		)	(307,391		)	(456,075		)
Balance at the end of the year	$	20,647,236		$	19,701,185		$	19,031,289
Accumulated Depreciation:
Balance at the beginning of the year	$	4,116,020		$	3,826,862		$	3,458,640
Depreciation expense	488,919			548,397			478,457
Assets sold/written-off	(131,044		)	(259,239		)	(110,235		)
Balance at the end of the year	$	4,473,895		$	4,116,020		$	3,826,862

Note: Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.