105 Mercer St, Seattle, WA 98109

Multifamily · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: mid-rise apartment, 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 AI estimate from public imagery; may be outdated.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 5,391 reachable multifamily buildings in Seattle. Larger than 82% of multifamily buildings in Seattle (median 9,444 SF), derived from assessor records.

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Building size: 32,908 SF, King County Assessor
Lot size: 12,514 SF, King County Assessor
Year built: 1929, King County Assessor
Stories: 3, King County Assessor
Predominant use: Mercer Apts, King County Assessor
Units: 41, King County Assessor
Assessed value: $9,224,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $280.30/SF, derived from assessor records
Lot coverage: 263%, derived from assessor records
Vintage: pre-war vintage
Zoning: SM-UP 85 (M1), King County
County use code: Apartment
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.

527 1st Ave N, Seattle · 0 mi · 13,130 SF · built 1929 · assessed $359.63/SF
100 Republican St, Seattle · 0 mi · 301,831 SF · built 2012 · assessed $221.37/SF
513 1st Ave N, Seattle · 0.1 mi · 97,101 SF · built 2022 · assessed $311.96/SF
617 Queen Anne Ave N, Seattle · 0.1 mi · 40,700 SF · built 1906 · assessed $335.95/SF
100 Roy St, Seattle · 0.1 mi · 143,134 SF · built 2023 · assessed $371.48/SF
715 Warren Ave N, Seattle · 0.1 mi · 6,910 SF · built 1963 · assessed $335.60/SF

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Sale history and market context

MakeMe Estimate: $8,847,057 (estimated market value), with a likely range of $7,853,421 to $10,092,032 (half of recent verified sales in this segment landed inside that range). Based on 667 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works. About $216K per unit at the midpoint (41 units).

Last sold: 2019-12-05 for $11,785,000 (recorded arm's-length sale).

Current ownership dates to 2019 (about 7 years) per recorded transfers.

2019-12-05: $11,785,000 from 105 Mercer LLC to Mgre 105 Mercer LLC, rec. 20191213001133

2018-10-30: transfer from 105 Mercer LLC to 105 Mercer LLC (non-market transfer), rec. 20181102000516

2017-04-26: $8,944,330 from Private party to 105 Mercer LLC Et Al, rec. 20170501001248

2 administrative transfers (no consideration), 1984 to 2004

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 $4,108,000 (2011) to $9,224,000 (2026), up 125% over 15 years, per county tax rolls. The 2026 roll splits $9,224,000 into $6,882,700 land and $2,341,300 improvements.

Zoning: SM-UP 85 (M1) (per King County)

Lot: 12,514 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Multiple Residence (Low Rise) 32,908 SF (county building sections)

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