18035 Sperry Dr, Tukwila, WA 98188

Office · Tukwila · Seattle-Bellevue metro, WA

One of 97 reachable office buildings in Tukwila. Larger than 64% of office buildings in Tukwila (median 12,273 SF), derived from assessor records.

Usable building area
20,250 SF, King County Assessor
Lot size
79,264 SF, King County Assessor
Year built
1977, King County Assessor
Stories
1, King County Assessor
Predominant use
Office / Warehouse, King County Assessor
Assessed value
$4,234,300, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$209.10/SF, derived from assessor records
Usable area / lot
0.26, derived from assessor records
Vintage
1970s vintage
Zoning
TUC-WP, 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: $5.22M (estimated market value), with a likely range of $4.36M to $6.35M (half of recent verified sales in this segment landed inside that range). Based on 8 verified arm's-length comparable sales (through 2026-06-01). The county roll carries a nominal improvement value for this parcel, so the estimate leans on comparable sales and the county-confirmed building area rather than the county land and improvement split. Not an appraisal. How this estimate works.

lower confidence: 5 comparable sales within 3 miles; nearest 1 mi. This property type carries wider measured error; treat the estimate as a starting point. Comparable-sale caveat: the estimate is 35% above the $191.38/SF median of the shown comparable sales.

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: 1990-03-09 for $1,350,000 (recorded arm's-length sale).

Current ownership dates to 1990 (about 36 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$2M$4M$6M$8M201120142017202020232026$5.22M$4.23MCounty assessed valueMakeMe Estimate range

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 $1,984,900 (2011) to $4,234,300 (2026), up 113% over 15 years, per county tax rolls. The 2026 roll splits $4,234,300 into $4,200,900 land and $33,400 improvements.

Taxes