402 21st St SE, Auburn, WA 98002

Multifamily · Auburn · Seattle-Bellevue metro, WA

One of 198 reachable multifamily buildings in Auburn. Larger than 86% of multifamily buildings in Auburn (median 13,000 SF), derived from assessor records.

Usable building area
61,906 SF, King County Assessor
County gross area
64,034 SF, King County Assessor
Excluded area
2,128 SF outside primary usable area
Lot size
106,430 SF, King County Assessor
Year built
1968, King County Assessor
Stories
2, King County Assessor
Predominant use
Apartment, King County Assessor
Units
72, King County Assessor
Assessed value
$13,991,000, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$226/SF, derived from assessor records
Usable area / lot
0.58, derived from assessor records
Vintage
1960s vintage
Zoning
R20, King County
County use code
Apartment

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: $13.3M (estimated market value), with a likely range of $11.9M to $15.2M (half of recent verified sales in this segment landed inside that range). Based on 4 verified arm's-length comparable sales (through 2026-06-01). Not an appraisal. How this estimate works. About $185K per unit at the midpoint (72 units).

lower confidence: 0 comparable sales within 3 miles; nearest 5.9 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.

Market context: Multifamily in Auburn

median verified sale $220.82/SF over the trailing 24 months; median $163,963 per unit; 3 sales in the last 12 months and 5 in 24 (newest verified sale 2025-12).

Computed from 199 verified arm's-length sales in King County public records (5 in the trailing 24 months). Free public records. Not an appraisal.

Last sold: 2008-03-31 for $5,489,200 (recorded arm's-length sale).

Current ownership dates to 2008 (about 18 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$5M$10M$15M$20M201120142017202020232026$13.3M$14MCounty 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 $4,042,000 (2011) to $13,991,000 (2026), up 246% over 15 years, per county tax rolls. The 2026 roll splits $13,991,000 into $1,170,700 land and $12,820,300 improvements.

Taxes

Permit history

Source: King County permit records (newest first).