20825 31st Ln S, Seatac, WA 98198

Multifamily · Seatac · Seattle-Bellevue metro, WA

One of 72 reachable multifamily buildings in Seatac. Larger than 3% of multifamily buildings in Seatac (median 23,400 SF), derived from assessor records.

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Building size: 3,680 SF, King County Assessor
Lot size: 3,604 SF, King County Assessor
Year built: 1986, King County Assessor
Stories: 2, King County Assessor
Predominant use: Legacy Place Apartments, King County Assessor
Units: 4, King County Assessor
Assessed value: $844,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $229.35/SF, derived from assessor records
Lot coverage: 102%, derived from assessor records
Vintage: 1980s vintage
Zoning: URM, King County
County use code: 4-Plex
Parking (observed): surface lot, AI estimate from public imagery

Nearby comparable buildings

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

20801 32nd Ln S, Seatac · 0 mi · 27,216 SF · built 1984 · assessed $222.99/SF
20844 31st Ln S, Seatac · 0 mi · 3,680 SF · built 1986 · assessed $229.35/SF
20810 32nd Ln S, Seatac · 0 mi · 19,092 SF · built 1991 · assessed $215.74/SF
20824 31st Ln S, Seatac · 0 mi · 3,680 SF · built 1986 · assessed $229.35/SF
20832 31st Ln S, Seatac · 0 mi · 3,680 SF · built 1986 · assessed $229.35/SF
20835 31st Ln S, Seatac · 0 mi · 3,680 SF · built 1986 · assessed $229.35/SF

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Sale history and market context

MakeMe Estimate: $949,173 (estimated market value), with a likely range of $842,568 to $1,082,742 (half of recent verified sales in this segment landed inside that range). Based on 667 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works. About $237K per unit at the midpoint (4 units).

Current ownership dates to 2019 (about 7 years) per recorded transfers.

2019-06-24: $4,663,646 from RC Madrona II LLC to Washington State of/Department of Transportation (part of a 17-parcel sale; price is the whole deal), rec.

2006-06-29: $6,495,700 from Presidential Estates Apartment Associates LLC to RC Madrona II LLC (part of a 17-parcel sale; price is the whole deal), rec. 20060629002844

1997-01-02: transfer from Presidential Estates Apartment Assoc to Presidential Estates Apartment Assoc LLC (part of a 17-parcel sale; price is the whole deal), rec. 199701160164

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 $374,000 (2011) to $844,000 (2026), up 126% over 15 years, per county tax rolls. The 2026 roll splits $844,000 into $152,000 land and $692,000 improvements.

Zoning: URM (per King County)

Lot: 3,604 sq ft

Nuisance flags: Airport noise

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Multiple Residence (Low Rise) 3,680 SF (county building sections)

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