Least efficient large buildings in Seattle

Bottom 100 ENERGY STAR scores among buildings over 50,000 sq ft under Seattle Energy Benchmarking Ordinance (SMC 22.920) — the penalty-exposure watchlist. Flip side: most efficient →

At a glance

Amli Waterfront Apartments has the lowest ENERGY STAR score among Seattle buildings over 50,000 sq ft: 1 out of 100 in its 2025 disclosure. The 100 buildings ranked here score between 1 and 38, against a citywide average of 78 across all sizes.

Bottom 100 by ENERGY STAR score

#	Building	City	Score	Site EUI	Floor area
1	Amli Waterfront Apartments	Seattle	D1	21375.4 kBtu/ft²	200,152 sq ft
2	4545 15th Ave Ne	Seattle	D1	278.3 kBtu/ft²	113,944 sq ft
3	3005 1st Ave Building	Seattle	D1	174.8 kBtu/ft²	109,347 sq ft
4	Sound View West Condominium	Seattle	D1	97.9 kBtu/ft²	82,082 sq ft
5	Sorrento Hotel	Seattle	D1	305.1 kBtu/ft²	76,631 sq ft
6	EVERGREEN WHLSLE FLORIST (DEMOLISHED)	Seattle	D1	23.5 kBtu/ft²	66,968 sq ft
7	Restaurant Depot	Seattle	D1	143.1 kBtu/ft²	63,225 sq ft
8	Annaliese	Seattle	D1	60.4 kBtu/ft²	58,152 sq ft
9	Union Gospel Mission Assn - Admin Building	Seattle	D1	48.1 kBtu/ft²	54,765 sq ft
10	Scca - Proton Therapy Center	Seattle	D1	477.7 kBtu/ft²	53,575 sq ft
11	3101 Western (Formerly Airborne Bldg)	Seattle	D3	177.4 kBtu/ft²	253,103 sq ft
12	Seattle Distribution Center Bldg A	Seattle	D3	61.5 kBtu/ft²	124,472 sq ft
13	MADISON APTS- FIRE/WILL BE DEMO'D	Seattle	D3	173.1 kBtu/ft²	54,770 sq ft
14	6th & Holgate Building	Seattle	D5	56.3 kBtu/ft²	149,881 sq ft
15	Park Place Assisted Living Apts	Seattle	D7	172.9 kBtu/ft²	121,635 sq ft
16	Merrill Gardens - Faerland Terrace	Seattle	D9	60.2 kBtu/ft²	95,117 sq ft
17	1000 Denny Way Building	Seattle	D10	197.1 kBtu/ft²	287,819 sq ft
18	Shannon Condominium	Seattle	D10	50.3 kBtu/ft²	97,160 sq ft
19	Emerald Landing I	Seattle	D10	100.9 kBtu/ft²	84,116 sq ft
20	CAMLIN WORLDMARK HOTEL	Seattle	D10	104.5 kBtu/ft²	83,008 sq ft
21	1223 Spring Street Condominium	Seattle	D10	72.1 kBtu/ft²	66,924 sq ft
22	Plym0uth On Stewart Apts	Seattle	D10	109.8 kBtu/ft²	55,882 sq ft
23	Northgate Office Building	Seattle	D10	103.4 kBtu/ft²	53,730 sq ft
24	Concord Condominium	Seattle	D11	89.6 kBtu/ft²	219,874 sq ft
25	Citizenm South Lake Union Hotel	Seattle	D13	91.5 kBtu/ft²	89,199 sq ft
26	Plymouth Congregational Church	Seattle	D14	87.1 kBtu/ft²	75,058 sq ft
27	A O SMITH CORP (includes #24845)- DEMOLISHED	Seattle	D14	17.1 kBtu/ft²	51,050 sq ft
28	Spinnaker Bay Condominium	Seattle	D15	46.2 kBtu/ft²	71,000 sq ft
29	Nyer Urness House Apts	Seattle	D16	103.2 kBtu/ft²	51,287 sq ft
30	Seattle Academy Campus	Seattle	D17	67.4 kBtu/ft²	164,074 sq ft
31	Market Place North Phase I Condominium	Seattle	D18	51.8 kBtu/ft²	185,506 sq ft
32	Terreno 2nd Ave	Seattle	D18	57.3 kBtu/ft²	50,832 sq ft
33	Pacific Iron & Metal	Seattle	D19	57.0 kBtu/ft²	61,200 sq ft
34	Industrial Transfer Whse	Seattle	D20	46.4 kBtu/ft²	98,220 sq ft
35	Stone Avenue Building	Seattle	D20	76.6 kBtu/ft²	92,080 sq ft
36	507 Northgate	Seattle	D21	59.2 kBtu/ft²	295,410 sq ft
37	The Summit	Seattle	D21	111.3 kBtu/ft²	207,022 sq ft
38	East Union Apartments	Seattle	D21	51.4 kBtu/ft²	184,974 sq ft
39	Charlie's Produce & Catering (Terminal)	Seattle	D21	130.3 kBtu/ft²	104,099 sq ft
40	First Presbyterian Church	Seattle	D22	70.4 kBtu/ft²	131,127 sq ft
41	Greentree Village Condominium	Seattle	D22	30.2 kBtu/ft²	79,963 sq ft
42	Parkshore	Seattle	D23	97.4 kBtu/ft²	225,629 sq ft
43	Ballard Landmark	Seattle	D23	51.5 kBtu/ft²	197,368 sq ft
44	Sutton Place Condominium	Seattle	D23	90.2 kBtu/ft²	101,706 sq ft
45	Wilsonian Apartments	Seattle	D23	84.3 kBtu/ft²	100,234 sq ft
46	Domaine	Seattle	D23	50.2 kBtu/ft²	67,796 sq ft
47	R.d. Merrill Building	Seattle	D23	74.1 kBtu/ft²	50,499 sq ft
48	Northwest Outpatient Medical Center	Seattle	D24	157.5 kBtu/ft²	133,298 sq ft
49	Northaven Senior Living	Seattle	D24	52.1 kBtu/ft²	124,904 sq ft
50	Harwood Condominium	Seattle	D24	32.7 kBtu/ft²	114,030 sq ft
51	Mercy Magnuson Place - Building 9 - Sand Point	Seattle	D25	34.0 kBtu/ft²	213,076 sq ft
52	Ballard Care & Rehab	Seattle	D25	147.7 kBtu/ft²	65,636 sq ft
53	Pioneer Human Services	Seattle	D25	77.7 kBtu/ft²	55,450 sq ft
54	Cristalla Condominium	Seattle	D26	66.2 kBtu/ft²	248,225 sq ft
55	Kelleher House Condominium	Seattle	D26	40.7 kBtu/ft²	76,855 sq ft
56	Washington Park Towers Condominium	Seattle	D27	54.8 kBtu/ft²	146,102 sq ft
57	Bloodworks Nw Central Seattle	Seattle	D27	141.4 kBtu/ft²	121,099 sq ft
58	Kimberly Apts	Seattle	D27	78.6 kBtu/ft²	51,510 sq ft
59	Fedex Van Terminal	Seattle	D28	32.1 kBtu/ft²	123,061 sq ft
60	South Seattle Distribution Center- 3601	Seattle	D28	81.7 kBtu/ft²	52,613 sq ft
61	Lake City Center	Seattle	D28	67.2 kBtu/ft²	50,759 sq ft
62	Lake Washington Apartments	Seattle	D29	36.6 kBtu/ft²	332,900 sq ft
63	University Book Store	Seattle	D29	59.8 kBtu/ft²	89,200 sq ft
64	Office Building, 2111 N NORTHGATE WAY	Seattle	D29	77.9 kBtu/ft²	76,105 sq ft
65	First Free Methodist Church	Seattle	D29	35.8 kBtu/ft²	62,200 sq ft
66	Continental Place Condominium	Seattle	D30	74.6 kBtu/ft²	190,610 sq ft
67	Ballard House	Seattle	D30	54.8 kBtu/ft²	52,926 sq ft
68	Fifteen Twenty-One Second Avenue	Seattle	D31	59.5 kBtu/ft²	330,693 sq ft
69	Cabrini Medical Tower	Seattle	D31	117.4 kBtu/ft²	319,911 sq ft
70	Kiro-Tv	Seattle	D31	105.5 kBtu/ft²	100,734 sq ft
71	Simons Senior Apts	Seattle	D31	60.8 kBtu/ft²	96,980 sq ft
72	Imperial House	Seattle	D31	57.9 kBtu/ft²	74,327 sq ft
73	Viktoria Apartments	Seattle	D32	61.5 kBtu/ft²	237,186 sq ft
74	Zephyr Apts	Seattle	D33	43.0 kBtu/ft²	85,647 sq ft
75	The Canal View Building	Seattle	D33	83.5 kBtu/ft²	77,174 sq ft
76	Citizenm Seattle Pioneer Square	Seattle	D33	58.0 kBtu/ft²	66,639 sq ft
77	Lyon Building	Seattle	D33	78.6 kBtu/ft²	63,712 sq ft
78	The Bush School - Middle And Lower School Campus	Seattle	D34	78.9 kBtu/ft²	109,794 sq ft
79	Lakeside West Condominium	Seattle	D34	99.0 kBtu/ft²	80,539 sq ft
80	University Congregational Church	Seattle	D34	52.4 kBtu/ft²	56,772 sq ft
81	First Hill Plaza Condominium	Seattle	D35	53.6 kBtu/ft²	231,352 sq ft
82	Skyline Olympic Tower	Seattle	D35	46.6 kBtu/ft²	188,183 sq ft
83	The Cobb Apartments	Seattle	D35	70.1 kBtu/ft²	123,897 sq ft
84	Thaw Building	Seattle	D35	61.0 kBtu/ft²	91,360 sq ft
85	Tri-Court	Seattle	D35	48.9 kBtu/ft²	57,247 sq ft
86	Volta Apartments	Seattle	D35	51.1 kBtu/ft²	54,550 sq ft
87	Seattle City Light North Service Center (Nsc)	Seattle	D36	78.3 kBtu/ft²	91,130 sq ft
88	St Joseph K-8 School	Seattle	D36	39.9 kBtu/ft²	67,743 sq ft
89	Tableau	Seattle	D36	65.7 kBtu/ft²	53,108 sq ft
90	Sunset West Phase Ii Condominium	Seattle	D37	43.6 kBtu/ft²	239,054 sq ft
91	The Kenney	Seattle	D37	117.8 kBtu/ft²	203,155 sq ft
92	Chambery Park Condominium	Seattle	D37	23.8 kBtu/ft²	130,680 sq ft
93	Edgewater Inn	Seattle	D37	169.5 kBtu/ft²	122,309 sq ft
94	Parkview Plaza Condominium	Seattle	D37	59.2 kBtu/ft²	78,538 sq ft
95	Swedish Medical Center Ballard - Campus	Seattle	D38	219.5 kBtu/ft²	451,526 sq ft
96	Tate Mason	Seattle	D38	49.7 kBtu/ft²	132,024 sq ft
97	SAFEWAY #1885	Seattle	D38	268.6 kBtu/ft²	93,997 sq ft
98	Concept One Apts	Seattle	D38	72.8 kBtu/ft²	63,861 sq ft
99	Harbor Park Condominium	Seattle	D38	46.9 kBtu/ft²	63,414 sq ft
100	The Century House	Seattle	D38	46.0 kBtu/ft²	58,485 sq ft

What do Seattle's least efficient buildings have in common?

23 of them score 10 or lower. By property type the list is led by multifamily housing (45), office (11) and non-refrigerated warehouse (8). Their average site EUI is 88.2 kBtu/ft², about 85% above the citywide average of 47.6 kBtu/ft². Combined they cover 12.0 million square feet; the median ranked building has 92,080 sq ft.

The ranking covers buildings of 50,000 sq ft or more that report an ENERGY STAR score, ordered by score and then by floor area. Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.

More Seattle rankings and data

Frequently asked questions

Which large Seattle buildings have the worst energy grades?

Amli Waterfront Apartments reports the lowest ENERGY STAR score (1) among Seattle buildings over 50,000 sq ft. Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.

Does a low score mean the building breaks the law?

No. A low ENERGY STAR score is a national efficiency percentile, not a violation. It does correlate with exposure under building-performance standards (carbon caps, retrofit mandates), which is why owners, lenders and retrofit contractors watch these lists.

About this data

Source: Building Energy Benchmarking (Seattle Energy Benchmarking Ordinance (SMC 22.920)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.

Cite as: BuildingCensus, “Least efficient buildings in Seattle”, https://buildingcensus.com/rankings/least-efficient/seattle (data as of October 2, 2026).