100 W Roy St, Seattle, WA 98119

Office · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: mid-rise office, 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 AI estimate from public imagery; may be outdated.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 957 reachable office buildings in Seattle. Larger than 60% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size
34,976 SF, King County Assessor
Lot size
12,000 SF, King County Assessor
Year built
1912, King County Assessor
Stories
3, King County Assessor
Predominant use
Mixed Use Office/Retail/Theater, King County Assessor
Assessed value
$6,286,600, per the King County Assessor (not a market appraisal)
Assessed value per building SF
$179.74/SF, derived from assessor records
Lot coverage
291%, derived from assessor records
Vintage
pre-war vintage
Zoning
SM-UP 85 (M1), King County
County use code
Office Building
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.

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Sale history and market context

MakeMe Estimate: $6,489,431 (estimated market value), with a likely range of $6,319,433 to $8,574,327 (half of recent verified sales in this segment landed inside that range). Based on 185 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Last sold: 1996-07-01 for $1,555,125 (recorded arm's-length sale).

Current ownership dates to 1996 (about 30 years) per recorded transfers.

Source: King County recorded sales extract; buyer and seller shown only when a company or organization. Individual names are withheld.

Value over time

$3.32M$6.64M$9.96M$13.3M20102014201820222026County appraised valueEstimated value (modeled range)

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 $4,127,400 (2010) to $6,286,600 (2026), up 52% over 16 years, per county tax rolls. The 2026 roll splits $6,286,600 into $5,728,800 land and $557,800 improvements.

Taxes