17710 100th Ave SW, Vashon, WA 98070

Office · Vashon · Seattle-Bellevue metro, WA

One of 25 reachable office buildings in Vashon. Larger than 88% of office buildings in Vashon (median 2,753 SF), derived from assessor records.

Usable building area
7,247 SF, King County Assessor
County gross area
7,361 SF, King County Assessor
Excluded area
114 SF outside primary usable area
Lot size
21,875 SF, King County Assessor
Year built
1974, King County Assessor
Stories
2, King County Assessor
Predominant use
Office, King County Assessor
Assessed value
$1,301,700, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$179.62/SF, derived from assessor records
Usable area / lot
0.33, derived from assessor records
Vintage
1970s vintage
Zoning
CB, King County
County use code
Office Building

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: $1.57M (estimated market value), with a likely range of $1.39M to $1.81M (half of recent verified sales in this segment landed inside that range). Based on 7 verified arm's-length comparable sales (through 2026-06-01). Not an appraisal. How this estimate works.

lower confidence: 0 comparable sales within 3 miles; nearest 5.8 mi. This property type carries wider measured error; treat the estimate as a starting point. Last arm's-length sale: $1,150,000 in 2022. The market has moved since; the estimate reflects current county values and ratios, not that price.

Comparable sales used as evidence

Recorded arm's-length sales of similar buildings nearby; nearer and more recent sales rank first. Buyer and seller names are withheld. Get this data via API.

Last sold: 2022-11-01 for $1,150,000 (recorded arm's-length sale).

Current ownership dates to 2022 (about 4 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

$0$1M$2M$3M201120142017202020232026Last sold $1.15M · 2022$1.57M$1.3MCounty assessed valueMakeMe Estimate rangeRecorded sale

Dark line: county assessed value per King County tax rolls. Blue line: our estimate; dashed years are a modeled backcast built from recorded arm's-length sales in the building's segment, not estimates published at the time, and years without enough sales stay unmodeled. The shaded range is the model's measured error band; about half of verified sales in the segment land inside it. Diamonds: recorded arm's-length sales. Not an appraisal. How this estimate works.

Land, site, and value history

Assessed value moved from $1,078,900 (2011) to $1,301,700 (2026), up 21% over 15 years, per county tax rolls. The 2026 roll splits $1,301,700 into $590,600 land and $711,100 improvements.

Taxes

Permit history

Source: King County permit records (newest first).