850 Republican St, Seattle, WA 98109

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 AI estimate from public imagery; may be outdated.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 94% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size
436,497 SF, King County Assessor
Lot size
71,626 SF, King County Assessor
Year built
2008, King County Assessor
Stories
5, King County Assessor
Predominant use
Bio-Tech Research Facility, King County Assessor
Assessed value
$252,045,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF
$577.43/SF, derived from assessor records
Lot coverage
609%, derived from assessor records
Vintage
2000s vintage
Zoning
SM-SLU 175/85-280, King County
County use code
Medical/Dental Office
Construction (observed)
steel glass, 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.

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Sale history and market context

MakeMe Estimate: $232,959,525 (estimated market value), with a likely range of $210,537,667 to $303,535,236 (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.

Last sold: 2016-08-31 for $98,864,000 (recorded arm's-length sale).

Current ownership dates to 2016 (about 10 years) per recorded transfers.

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

Value over time

$132M$263M$395M$527M201120142017202020232026$98.9MCounty appraised valueEstimated value (modeled range)Recorded sale

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 $102,219,600 (2011) to $252,045,000 (2026), up 147% over 15 years, per county tax rolls. The 2026 roll splits $252,045,000 into $68,044,700 land and $184,000,300 improvements.

Taxes