910 Boylston Ave, Seattle, WA 98104

Office · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: low-rise office. 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 AI estimate from public imagery; may be outdated.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 33% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size: 7,960 SF, King County Assessor
Lot size: 6,720 SF, King County Assessor
Year built: 1966, King County Assessor
Stories: 1, King County Assessor
Predominant use: Medical Office Building, King County Assessor
Assessed value: $4,128,600, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $518.67/SF, derived from assessor records
Lot coverage: 118%, derived from assessor records
Vintage: 1960s vintage
Zoning: MIO-70-HR (M), King County
County use code: Medical/Dental Office
Construction (observed): masonry, AI estimate from public imagery
Parking (observed): none visible, 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.

900 Boylston Ave, Seattle · 0 mi · 6,795 SF · built 1946 · assessed $467.70/SF
1395 Marion St, Seattle · 0.1 mi · 12,000 SF · built 2016 · assessed $299.06/SF
801 Broadway, Seattle · 0.1 mi · 250,902 SF · built 1970 · assessed $192.85/SF
720 Broadway, Seattle · 0.1 mi · 44,660 SF · built 1988 · assessed $482.34/SF
700 Broadway, Seattle · 0.1 mi · 83,540 SF · built 1963 · assessed $247.81/SF
1101 Madison St, Seattle · 0.2 mi · 690,158 SF · built 1992 · assessed $145.09/SF

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Sale history and market context

MakeMe Estimate: $4,692,524 (estimated market value), with a likely range of $4,240,879 to $6,114,137 (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: 2020-10-19 for $5,000,000 (recorded arm's-length sale).

Current ownership dates to 2020 (about 6 years) per recorded transfers.

2020-10-19: $5,000,000 from Private party to Private party, rec. 20201020001819

2011-11-16: transfer from Greenspace INC to First Hill Partners LLC (non-market transfer), rec. 20120106000922

2008-03-25: $2,075,000 from Private party to Greenspace INC, rec. 20080325001748

1998-12-31: transfer from Private party to Private party (non-market transfer), rec. 199903182494

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 $2,063,200 (2011) to $4,128,600 (2026), up 100% over 15 years, per county tax rolls. The 2026 roll splits $4,128,600 into $3,864,000 land and $264,600 improvements.

Zoning: MIO-70-HR (M) (per King County)

Lot: 6,720 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Basement, Parking 3,980 SF; Medical Office 3,980 SF (county building sections)

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