501 Elliott Ave W, Seattle, WA 98119

Office · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: mid-rise office, appears multi-tenant. AI estimate from public imagery. In recent public imagery (2026-06), the building appears well maintained. AI estimate from public imagery; may be outdated.

One of 957 reachable office buildings in Seattle. Larger than 82% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size: 165,111 SF, King County Assessor
Lot size: 56,891 SF, King County Assessor
Year built: 2000, King County Assessor
Stories: 4, King County Assessor
Predominant use: Lab Building, 4 Stories & U/G Parking, King County Assessor
Assessed value: $79,915,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $484.01/SF, derived from assessor records
Lot coverage: 290%, derived from assessor records
Vintage: 2000s vintage
Zoning: II U/85, King County
County use code: Office Building
Construction (observed): masonry, AI estimate from public imagery
Parking (observed): street only, AI estimate from public imagery
Frontage (observed): mid block, AI estimate from public imagery

Nearby comparable buildings

Same building type, by distance. Assessor facts only; not an opinion of value.

401 Elliott Ave W, Seattle · 0.1 mi · 132,010 SF · built 2000 · assessed $395.27/SF
351 Elliott Ave W, Seattle · 0.1 mi · 162,420 SF · built 2000 · assessed $275.03/SF
410 W Harrison St, Seattle · 0.1 mi · 50,028 SF · built 1962 · assessed $395.90/SF
309 W Republican St, Seattle · 0.2 mi · 3,822 SF · built 1900 · assessed $385.03/SF
300 W Republican St, Seattle · 0.2 mi · 80,035 SF · built 2024 · assessed $296.68/SF
333 Elliott Ave W, Seattle · 0.2 mi · 183,964 SF · built 2008 · assessed $165.36/SF

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Sale history and market context

MakeMe Estimate: $78,960,364 (estimated market value), with a likely range of $71,360,597 to $102,881,618 (half of recent verified sales in this segment landed inside that range). Based on 55 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Current ownership dates to 2013 (about 13 years) per recorded transfers.

2013-04-03: $142,500,000 from Private party to Cole of Seattle Wa LLC (part of a 3-parcel sale; price is the whole deal), rec. 20130410002173

2005-12-16: $117,125,000 from 401 Elliott West LLC to CLPF Elliott West LP (part of a 3-parcel sale; price is the whole deal), rec. 20051216000286

1998-06-26: $540,000 from Diamond Parking INC to 401 Elliott West LLC, rec. 199806291255

Source: King County recorded sales extract; buyer and seller shown only when a company or organization. Individual names are withheld.

Value over time

Solid line: county appraised value per King County tax rolls. Shaded range: our modeled estimate for each year, built from recorded arm's-length sales in the building's segment; years without enough sales stay unmodeled. Dots: recorded arm's-length sales. Not an appraisal. How this estimate works.

Land, site, and value history

Assessed value moved from $27,484,000 (2011) to $79,915,000 (2026), up 191% over 15 years, per county tax rolls. The 2026 roll splits $79,915,000 into $12,800,400 land and $67,114,600 improvements.

Zoning: II U/85 (per King County)

Lot: 56,891 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Laboratories 60,741 SF; Open Office 56,065 SF; Basement, Parking 48,305 SF (county building sections)

County districts report (schools, fire, sewer, council; on kingcounty.gov)

Permit history

2025-10-24: Remodel, declared value $125,000, permit 7098240-CN

2024-09-16: Remodel, declared value $300,000 (Complete), permit 7008441-CN

2024-01-12: Electrical, declared value $264,584 (Complete), permit 7004579-EL

2023-03-30: Remodel, declared value $9,700,000 (Complete), permit 6907669-CN

2022-09-09: Remodel, declared value $15,000,000 (Complete), permit 6855198-CN

2015-12-30: Remodel, declared value $600,000 (Complete), permit 6507445

2015-05-11: Remodel, declared value $900,000 (Complete), permit 6469278

2014-10-30: Remodel, declared value $500,000 (Complete), permit 6428671

2014-09-11: Remodel, declared value $130,000 (Complete), permit 6436165

2012-02-24: Remodel, declared value $310,600 (Complete), permit 6308125

Source: King County permit records (newest first).