Biggest building emitters in the US

The 100 highest reported greenhouse-gas totals across every disclosure jurisdiction, latest year per building. Figures far outside what any building of its type can produce (unit or entry errors in the city files) are left out. Per-city lists: New York City · Chicago · Seattle · Los Angeles · Cambridge · San Francisco · Boston · Washington, DC · Denver · Philadelphia · Montgomery County · Kansas City · San José · San Diego · Berkeley · California · Atlanta · Ann Arbor · Evanston · St. Louis · Miami · Portland · Honolulu · Reno

At a glance

Ucla Main Campus in California is the biggest reported building emitter in US benchmarking disclosures, at 239,571 tCO₂e in its 2024 report. The 100 buildings ranked here reported 5,935,098 tCO₂e together — 8% of the 73,567,766 tCO₂e reported by all 142,504 disclosed buildings.

Top 100 by reported emissions

#	Building	City	Emissions	Score	Floor area
1	Ucla Main Campus	California	239,571 tCO₂e	–—	27,989,925 sq ft
2	University of Pennsylvania	Philadelphia	197,016 tCO₂e	–—	—
3	Pratt S.I. Campus - Total	New York City	141,938 tCO₂e	–—	438,530 sq ft
4	Co-Op City	New York City	138,481 tCO₂e	D46	21,150,159 sq ft
5	NYP Columbia (West Campus)	New York City	132,358 tCO₂e	D12	5,144,107 sq ft
6	Intel Mission Campus	California	120,106 tCO₂e	–—	2,215,115 sq ft
7	Uw - University Of Washington Seattle Campus (Master)	Seattle	113,771 tCO₂e	–—	15,216,474 sq ft
8	San Francisco International Airport (Sfo)	California	111,514 tCO₂e	–—	20,835,176 sq ft
9	Rush University Medical Center	Chicago	97,340 tCO₂e	D36	4,232,186 sq ft
10	Ca1	California	94,994 tCO₂e	–—	342,797 sq ft
11	The Children's Hospital fo Philadelphia	Philadelphia	94,758 tCO₂e	–—	—
12	Uc Davis Campus	California	93,701 tCO₂e	–—	11,398,733 sq ft
13	Benchmarking Group - 211	New York City	93,318 tCO₂e	–—	5,970,773 sq ft
14	Franklin Plaza 1656	New York City	85,851 tCO₂e	D1	1,838,700 sq ft
15	Columbia University Main Campus	New York City	85,124 tCO₂e	–—	6,890,880 sq ft
16	NYU: Washington Square CoGen Campus	New York City	80,240 tCO₂e	–—	7,553,129 sq ft
17	Washington Hospital Center	Washington, DC	79,389 tCO₂e	D1	2,000,000 sq ft
18	METROPOLITIAN PIER AND EXPOSITION AUTHORITY	Chicago	78,782 tCO₂e	–—	9,245,333 sq ft
19	LL84 NYU Langone Health - Main Campus	New York City	76,581 tCO₂e	–—	3,532,083 sq ft
20	Parkchester Full Campus (North + South)	New York City	72,078 tCO₂e	D28	12,817,770 sq ft
21	Rockefeller Center (All Bldgs)	New York City	71,221 tCO₂e	–—	8,053,115 sq ft
22	Rochdale Village - Campus	New York City	69,444 tCO₂e	D9	7,898,975 sq ft
23	Hudson Yards Cogen Campus	New York City	68,380 tCO₂e	–—	7,739,076 sq ft
24	Uc Irvine	California	65,926 tCO₂e	–—	8,534,295 sq ft
25	Willis Tower (Rivion LLC)	Chicago	63,190 tCO₂e	D32	4,534,594 sq ft
26	MSKCC - Super Campus -(Main Campus / Schwartz / RRL/ ZRC )	New York City	63,172 tCO₂e	–—	2,437,399 sq ft
27	CEPSR Schapiro	New York City	60,211 tCO₂e	–—	207,940 sq ft
28	OHSU	Portland	59,993 tCO₂e	–—	3,338,504 sq ft
29	2220 De La Cruz Blvd (Sc1)	California	59,844 tCO₂e	–—	470,999 sq ft
30	AECOM College, Laboratory Spaces and Weiler Campus	New York City	59,462 tCO₂e	–—	2,173,486 sq ft
31	Sub Station Buildings	Washington, DC	58,636 tCO₂e	–—	3,276,489 sq ft
32	Z073 - Central Utility Plant	California	57,597 tCO₂e	–—	3,426,018 sq ft
33	Main Airport Terminal Complex	Philadelphia	57,130 tCO₂e	–—	—
34	300 Longwood Ave	Boston	56,999 tCO₂e	–—	2,391,883 sq ft
35	Hospital (General Medical & Surgical) building #C10028	Boston	56,857 tCO₂e	D46	4,164,224 sq ft
36	Ntt Global Data Centers Americas - Ca1, Ca2, And Ca3 Campus	California	55,955 tCO₂e	–—	556,588 sq ft
37	NYP Cornell (East Campus)	New York City	55,574 tCO₂e	D47	2,801,795 sq ft
38	Uc Davis	California	55,311 tCO₂e	–—	11,398,733 sq ft
39	111 Eighth Avenue	New York City	53,701 tCO₂e	–—	2,375,706 sq ft
40	Moses Campus	New York City	52,888 tCO₂e	–—	1,590,710 sq ft
41	Georgetown University Main Campus	Washington, DC	52,650 tCO₂e	–—	4,680,268 sq ft
42	Pcup & Parnassus Campus	California	52,138 tCO₂e	–—	3,373,568 sq ft
43	DEP > BWT_9611_Newtown Creek WPCP Campus	New York City	51,516 tCO₂e	D1	1,306,271 sq ft
44	Benchmarking Group - 212	New York City	51,477 tCO₂e	–—	3,472,597 sq ft
45	San Diego State University	California	50,990 tCO₂e	–—	5,466,569 sq ft
46	Lockheed Martin	California	49,057 tCO₂e	–—	3,903,450 sq ft
47	2020 East Tremont Avenue	New York City	49,023 tCO₂e	D1	2,409,161 sq ft
48	1980-2040 East Tremont Avenue - Parent Property	New York City	49,023 tCO₂e	D1	2,820,651 sq ft
49	MSKCC Super Campus - Main Campus / RRL / ZRC	New York City	48,737 tCO₂e	–—	2,490,355 sq ft
50	CHI1 - Chicago DC1	Chicago	48,295 tCO₂e	B75	474,979 sq ft
51	NH LIJ ZH Hospital Campus	New York City	47,836 tCO₂e	D12	1,699,445 sq ft
52	P&S - Black	New York City	47,833 tCO₂e	–—	721,049 sq ft
53	P&S - Black LL97	New York City	47,833 tCO₂e	–—	721,049 sq ft
54	Washington Hospital Center	Washington, DC	47,591 tCO₂e	–—	1,367,985 sq ft
55	BEPS1 - Foggy Bottom Campus	Washington, DC	47,341 tCO₂e	–—	5,533,789 sq ft
56	Wp&A Lost Hills Facility	California	46,526 tCO₂e	–—	1,500,275 sq ft
57	University Park Campus (Upc)	California	46,348 tCO₂e	–—	8,763,109 sq ft
58	DEP > BWT_859_Wards Island WPCP Campus	New York City	46,043 tCO₂e	D20	1,546,246 sq ft
59	Illinois Institute of Technology	Chicago	45,930 tCO₂e	–—	2,944,091 sq ft
60	Benchmarking Group - 38	New York City	45,282 tCO₂e	A93	2,381,204 sq ft
61	20 Gillette Park	Boston	45,066 tCO₂e	–—	1,269,312 sq ft
62	Ala Moana Center	Honolulu	44,658 tCO₂e	–—	1,838,144 sq ft
63	College/University building #C10059	Boston	44,471 tCO₂e	–—	6,872,989 sq ft
64	Moses Campus	New York City	44,394 tCO₂e	D30	1,715,442 sq ft
65	2045 - 2055 Lafayette St (Sjc17)	California	43,952 tCO₂e	–—	300,000 sq ft
66	NH LIJ Hillside Campus	New York City	43,849 tCO₂e	D21	1,729,945 sq ft
67	NH LIJ Medical	New York City	42,561 tCO₂e	D15	1,575,735 sq ft
68	HU Sub Station	Washington, DC	42,282 tCO₂e	–—	3,543,436 sq ft
69	NMH Feinberg Pavilion and Galter Pavilion	Chicago	41,775 tCO₂e	C65	2,200,000 sq ft
70	26464 Corporate Ave	California	41,459 tCO₂e	–—	131,896 sq ft
71	Stroger Hospital Campus	Chicago	40,317 tCO₂e	D12	1,596,300 sq ft
72	Georgetown University Hospital	Washington, DC	39,993 tCO₂e	D3	1,395,908 sq ft
73	Stuyvesant Town	New York City	39,464 tCO₂e	B83	9,055,218 sq ft
74	Howard University Main Campus - Updated Profile	Washington, DC	39,229 tCO₂e	–—	5,569,182 sq ft
75	1300 Morris Park Avenue	New York City	39,017 tCO₂e	–—	572,892 sq ft
76	Benchmarking Group - 226	New York City	38,988 tCO₂e	–—	2,345,603 sq ft
77	Renown Health Regional Hospital 1155 Mill	Reno	38,933 tCO₂e	C55	2,582,263 sq ft
78	Nestle Purina Petcare Company	Denver	38,913 tCO₂e	–—	462,285 sq ft
79	Children's National Medical Center	Washington, DC	38,697 tCO₂e	C57	1,957,377 sq ft
80	Howard University Main Campus	Washington, DC	38,637 tCO₂e	–—	4,414,673 sq ft
81	Benchmarking Group - 10	New York City	38,540 tCO₂e	–—	3,385,955 sq ft
82	Hospital (General Medical & Surgical) building #106826	Boston	38,532 tCO₂e	D8	1,629,256 sq ft
83	388 Greenwich - HQ	New York City	38,264 tCO₂e	B82	2,329,941 sq ft
84	H+H_9691_Bellevue Hospital: Center	New York City	37,776 tCO₂e	A91	2,276,300 sq ft
85	The Children's Mercy Hospital	Kansas City	36,856 tCO₂e	D45	1,657,200 sq ft
86	401 North Broad Lessee LLC	Philadelphia	36,769 tCO₂e	–—	1,296,804 sq ft
87	CCD	Chicago	36,452 tCO₂e	D5	1,205,371 sq ft
88	Main Hosp - 4401 Wornall	Kansas City	35,750 tCO₂e	D15	1,382,863 sq ft
89	8735, 2145 Sheridan Rd	Evanston	35,396 tCO₂e	–—	975,805 sq ft
90	20-30 Hudson Yards	New York City	34,862 tCO₂e	–—	3,810,623 sq ft
91	30 Rockefeller Plaza (Bld 1 & 9)	New York City	34,855 tCO₂e	–—	2,862,565 sq ft
92	MedStar Washington Hospital Center	Washington, DC	34,731 tCO₂e	D39	1,459,375 sq ft
93	Coresite Sv7	California	34,592 tCO₂e	–—	231,000 sq ft
94	Urgent Care/Clinic/Other Outpatient building #C10010	Boston	34,470 tCO₂e	–—	1,661,829 sq ft
95	Western Union Building	New York City	34,247 tCO₂e	–—	1,028,016 sq ft
96	HUP West	Philadelphia	33,685 tCO₂e	D22	—
97	1250-1300 Morris Park Avenue (South Campus, Lot 1)	New York City	33,437 tCO₂e	–—	911,540 sq ft
98	Perelman Center for Advanced Medicine	Philadelphia	33,278 tCO₂e	–—	—
99	CIG MMA_4427_Metropolitan Museum of Art	New York City	33,134 tCO₂e	–—	2,153,282 sq ft
100	MWHC and MNRH Campus	Washington, DC	32,943 tCO₂e	C67	2,157,159 sq ft

Where are the biggest-emitting buildings, and what are they?

By jurisdiction, the top 100 come mostly from New York City (42), California (18), Washington, DC (12) and Chicago (8). By property type the list is led by hospital (general medical & surgical) (28), college/university (16), data center (9) and multifamily housing (7).

The 100th building on the list reported 32,943 tCO₂e. Each figure is the building's own reported total for its latest disclosure year, so buildings from different jurisdictions can be from different years.

Frequently asked questions

Which US building emits the most carbon?

Among buildings in city benchmarking disclosures, Ucla Main Campus in California reported the most: 239,571 tCO₂e in its latest disclosure year.

Where do these emissions figures come from?

Each figure is the building's own reported total greenhouse-gas emissions (metric tons CO₂e) from its jurisdiction's mandatory energy-benchmarking disclosure — NYC LL84, Boston BERDO, DC BEPS, California AB 802 and every other US program with public data. Only the latest disclosure year per building is ranked.

About this data

Source: 24 municipal and state building-energy benchmarking disclosures, as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.

Cite as: BuildingCensus, “Biggest building emitters in the US”, https://buildingcensus.com/rankings/biggest-emitters (data as of October 2, 2026).