903 Union St, Seattle, WA 98101

Multifamily · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: mid-rise apartment building, 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 AI estimate from public imagery; may be outdated.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 93% of multifamily buildings in Seattle (median 9,444 SF), derived from assessor records.

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Building size: 90,920 SF, King County Assessor
Lot size: 23,040 SF, King County Assessor
Year built: 1922, King County Assessor
Stories: 10, King County Assessor
Predominant use: Cambridge Apts (LOW Income), King County Assessor
Units: 157, King County Assessor
Assessed value: $21,428,300, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $235.68/SF, derived from assessor records
Lot coverage: 395%, derived from assessor records
Vintage: pre-war vintage
Zoning: HR (M), King County
County use code: Apartment(Subsidized)
Construction (observed): masonry, AI estimate from public imagery
Parking (observed): surface lot, 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.

1331 Terry Ave, Seattle · 0 mi · 21,483 SF · built 1967 · assessed $260.58/SF
1317 Boren Ave, Seattle · 0.1 mi · 47,154 SF · built 1925 · assessed $193.49/SF
1020 University St, Seattle · 0.1 mi · 39,895 SF · built 1962 · assessed $265/SF
1011 Pike St, Seattle · 0.1 mi · 195,000 SF · built 1991 · assessed $211.62/SF
1330 Boren Ave, Seattle · 0.1 mi · 57,930 SF · built 1925 · assessed $234.23/SF
1020 Seneca St, Seattle · 0.1 mi · 52,620 SF · built 1925 · assessed $243.42/SF

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Sale history and market context

MakeMe Estimate: $21,169,888 (estimated market value), with a likely range of $19,336,669 to $21,847,498 (half of recent verified sales in this segment landed inside that range). Based on 98 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works. About $135K per unit at the midpoint (157 units).

Last sold: 2016-12-20 for $18,775,000 (recorded arm's-length sale).

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

2026-02-02: $800,000 from Cambridge LLLP to Private party (part of a 2-parcel sale; price is the whole deal), rec. 20260205000333

2016-12-20: $18,775,000 from Bellwether Housing to Cambridge LLLP, rec. 20161221001265

2001-07-31: $4,757,667 from Seattle Housing Authority to Housing Resource Group (non-market transfer), rec. 20010801000775

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 $5,677,500 (2010) to $21,428,300 (2026), up 277% over 16 years, per county tax rolls. The 2026 roll splits $21,428,300 into $13,086,300 land and $8,342,000 improvements.

Zoning: HR (M) (per King County)

Lot: 23,040 sq ft

Rated views: Seattle skyline

Nuisance flags: Traffic noise

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Apartment 89,808 SF; Retail Store 1,112 SF (county building sections)

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

Permit history

2025-10-14: Electrical, declared value $8,000 (Screened), permit 7111685-EL

2025-08-13: Electrical, declared value $23,000 (Screened), permit 7101435-EL

2023-09-19: Electrical, declared value $800 (Screened), permit 6986552-EL

2023-09-19: Electrical, declared value $800 (Screened), permit 6986556-EL

2023-09-19: Electrical, declared value $800 (Screened), permit 6986564-EL

2023-09-19: Electrical, declared value $800 (Screened), permit 6986538-EL

2023-09-19: Electrical, declared value $800 (Screened), permit 6986566-EL

2016-10-27: Remodel, declared value $10,000,000 (Complete), permit 6495645

Source: King County permit records (newest first).