2315 SW 320th St, Federal Way, WA 98023

Office · Federal Way · Seattle-Bellevue metro, WA

One of 189 reachable office buildings in Federal Way. Larger than 53% of office buildings in Federal Way (median 9,780 SF), derived from assessor records.

Usable building area
10,614 SF, King County Assessor
Lot size
115,434 SF, King County Assessor
Year built
1980, King County Assessor
Stories
1, King County Assessor
Buildings on parcel
3, King County Assessor
Predominant use
Unit 3 - 2317, King County Assessor
Assessed value
$1,139,700, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$107.38/SF, derived from assessor records
Usable area / lot
0.09, derived from assessor records
Vintage
1980s vintage
Zoning
PO, King County
County use code
Medical/Dental Office

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: $1.56M (estimated market value), with a likely range of $1.3M to $1.84M (half of recent verified sales in this segment landed inside that range). Based on 4 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

lower confidence: 1 comparable sale within 3 miles; nearest 2 mi. This property type carries wider measured error; treat the estimate as a starting point. Comparable-sale caveat: the estimate is 53% below the $310.43/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.

Market context: Office in Federal Way

median verified sale $245.41/SF over the trailing 24 months; 2 sales in the last 12 months and 5 in 24 (newest verified sale 2026-03).

  • 2022: $234.46/SF median (6 sales)
  • 2023: $210.86/SF median (4 sales)
  • 2024: $369/SF median (6 sales)

Computed from 215 verified arm's-length sales in King County public records (5 in the trailing 24 months). Free public records. Not an appraisal.