100 S Massachusetts St, Seattle, WA 98134

Small-Bay Industrial · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: large format retail warehouse. 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 AI estimate from public imagery; may be outdated.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 1,229 reachable small-bay industrial buildings in Seattle. Larger than 49% of small-bay industrial buildings in Seattle (median 14,469 SF), derived from assessor records.

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Building size: 14,272 SF, King County Assessor
Lot size: 21,261 SF, King County Assessor
Year built: 1996, King County Assessor
Stories: 2, King County Assessor
Predominant use: Ofc/Whse, King County Assessor
Assessed value: $4,454,800, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $312.14/SF, derived from assessor records
Lot coverage: 67%, derived from assessor records
Vintage: 1990s vintage
Zoning: UI U/85, King County
County use code: Warehouse
Construction (observed): metal, AI estimate from public imagery
Parking (observed): surface lot, AI estimate from public imagery
Frontage (observed): corner, AI estimate from public imagery

Nearby comparable buildings

Same building type, by distance. Assessor facts only; not an opinion of value.

1548 1st Ave S, Seattle · 0 mi · 12,550 SF · built 1970 · assessed $247.34/SF
1714 1st Ave S, Seattle · 0.1 mi · 18,406 SF · built 1927 · assessed $229.93/SF
1534 1st Ave S, Seattle · 0.1 mi · 40,878 SF · built 1928 · assessed $160.84/SF
1743 1st Ave S, Seattle · 0.1 mi · 22,580 SF · built 1927 · assessed $143.60/SF
1531 Utah Ave S, Seattle · 0.1 mi · 285,007 SF · built 2009 · assessed $171.66/SF
1749 1st Ave S, Seattle · 0.1 mi · 9,000 SF · built 1904 · assessed $262.97/SF

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Sale history and market context

MakeMe Estimate: $5,959,029 (estimated market value), with a likely range of $4,605,875 to $6,018,619 (half of recent verified sales in this segment landed inside that range). Based on 81 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Current ownership dates to 2012 (about 14 years) per recorded transfers.

2012-05-31: $9,450,000 from Falconbridge Enterprises INC to Wsa Properties IV LLC (part of a 2-parcel sale; price is the whole deal), rec. 20120601001508

2002-01-17: $1,975,000 from FBC Properties LLC to Falconbridge Enterprises INC (part of a 2-parcel sale; price is the whole deal), rec. 20020124001640

2 administrative transfers (no consideration), 1999 to 2001

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 $3,083,800 (2011) to $4,454,800 (2026), up 44% over 15 years, per county tax rolls. The 2026 roll splits $4,454,800 into $4,252,200 land and $202,600 improvements.

Zoning: UI U/85 (per King County)

Lot: 21,261 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Floor and use mix: Office Building 7,360 SF; Storage Warehouse 6,912 SF (county building sections)

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