16648 31st Ave S, Seatac, WA 98188

Multifamily · Seatac · Seattle-Bellevue metro, WA

One of 79 reachable multifamily buildings in Seatac. Larger than 4% of multifamily buildings in Seatac (median 20,118 SF), derived from assessor records.

Usable building area
3,376 SF, King County Assessor
County gross area
3,736 SF, King County Assessor
Excluded area
360 SF outside primary usable area
Lot size
7,200 SF, King County Assessor
Year built
1977, King County Assessor
Stories
2, King County Assessor
Predominant use
4-Plex, King County Assessor
Units
4, King County Assessor
Assessed value
$677,000, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$200.53/SF, derived from assessor records
Usable area / lot
0.47, derived from assessor records
Vintage
1970s vintage
Zoning
UVM, King County
County use code
4-Plex

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: $807K (estimated market value), with a likely range of $718K to $922K (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). Not an appraisal. How this estimate works. About $202K per unit at the midpoint (4 units).

moderate confidence: 4 comparable sales within 3 miles; nearest 2.3 mi.

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: 1994-02-10 for $203,425 (recorded arm's-length sale).

Current ownership dates to 2018 (about 8 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$500K$1M$1.5M201120142017202020232026$807K$677KCounty 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 $416,000 (2011) to $677,000 (2026), up 63% over 15 years, per county tax rolls. The 2026 roll splits $677,000 into $169,200 land and $507,800 improvements.

Taxes