501 21st St SE, Auburn, WA 98002

Multifamily · Auburn · Seattle-Bellevue metro, WA

One of 198 reachable multifamily buildings in Auburn. Larger than 27% of multifamily buildings in Auburn (median 13,000 SF), derived from assessor records.

Usable building area
6,320 SF, King County Assessor
Lot size
40,117 SF, King County Assessor
Year built
1973, King County Assessor
Stories
1, King County Assessor
Buildings on parcel
4, King County Assessor
Predominant use
Duplex With Garage, King County Assessor
Units
8, King County Assessor
Assessed value
$1,369,000, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$216.61/SF, derived from assessor records
Usable area / lot
0.16, derived from assessor records
Vintage
1970s 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: $1.68M (estimated market value), with a likely range of $1.5M to $1.92M (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 $211K per unit at the midpoint (8 units).

lower confidence: 2 comparable sales within 3 miles; nearest 1.3 mi. Recent sale check: this building sold for $2,070,000 in 2025; the estimate is about 19% apart. Treat the recorded trade as strong evidence alongside the model.

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: 2025-12-16 for $2,070,000 (recorded arm's-length sale).

Current ownership dates to 2025 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$3M201120142017202020232026$1.08MLast sold $2.07M · 2025$1.68M$1.37MCounty 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 $565,000 (2011) to $1,369,000 (2026), up 142% over 15 years, per county tax rolls. The 2026 roll splits $1,369,000 into $481,400 land and $887,600 improvements.

Taxes