623 W Mercer Pl, Seattle, WA 98119

Multifamily · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: mid-rise apartments, 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 AI estimate from public imagery; may be outdated.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 21% of multifamily buildings in Seattle (median 9,444 SF), derived from assessor records.

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Building size: 4,899 SF, King County Assessor
Lot size: 2,933 SF, King County Assessor
Year built: 1932, King County Assessor
Stories: 2, King County Assessor
Predominant use: 8 Unit Apt, King County Assessor
Units: 8, King County Assessor
Assessed value: $1,937,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $395.39/SF, derived from assessor records
Lot coverage: 167%, derived from assessor records
Vintage: pre-war vintage
Zoning: MR (M), 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.

500 W Mercer St, Seattle · 0 mi · 23,636 SF · built 1957 · assessed $295.82/SF
600 Elliott Ave W, Seattle · 0 mi · 116,595 SF · built 2014 · assessed $275.45/SF
617 5th Ave W, Seattle · 0 mi · 10,733 SF · built 1988 · assessed $294.33/SF
421 W Roy St, Seattle · 0.1 mi · 31,040 SF · built 1930 · assessed $246.07/SF
600 5th Ave W, Seattle · 0.1 mi · 22,716 SF · built 1985
412 W Mercer St, Seattle · 0.1 mi · 7,540 SF · built 1958 · assessed $407.43/SF

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Sale history and market context

MakeMe Estimate: $1,940,061 (estimated market value), with a likely range of $1,722,168 to $2,213,070 (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 $243K per unit at the midpoint (8 units).

Last sold: 2010-10-29 for $800,000 (recorded arm's-length sale).

Current ownership dates to 2010 (about 16 years) per recorded transfers.

2010-10-29: $800,000 from Private party to Private party, rec. 20101029003095

2004-10-22: $775,000 from Private party to Private party (non-market transfer), rec. 20041029000447

1997-10-29: $549,200 from Private party to Private party, rec. 199710310001

1992-09-30: $400,000 from Private party to Private party, rec. 199210011039

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 $1,029,000 (2011) to $1,937,000 (2026), up 88% over 15 years, per county tax rolls. The 2026 roll splits $1,937,000 into $976,600 land and $960,400 improvements.

Zoning: MR (M) (per King County)

Lot: 2,933 sq ft

Nuisance flags: Other nuisance

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Multiple Residence (Low Rise) 4,899 SF (county building sections)

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