31231 3rd Ave, Black Diamond, WA 98010

Commercial · Black Diamond · Seattle-Bellevue metro, WA

One of 26 reachable commercial buildings in Black Diamond. Larger than 73% of commercial buildings in Black Diamond (median 5,035 SF), derived from assessor records.

Usable building area
17,078 SF, King County Assessor
Lot size
208,036 SF, King County Assessor
Year built
2023, King County Assessor
Stories
1, King County Assessor
Buildings on parcel
4, King County Assessor
Predominant use
Car Wash, King County Assessor
Assessed value
$4,856,000, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$284.34/SF, derived from assessor records
Usable area / lot
0.08, derived from assessor records
Vintage
2020s vintage
Zoning
CC, King County
County use code
Car Wash

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: $5.83M (estimated market value), with a likely range of $4.84M to $7.03M (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.

lower confidence: 2 comparable sales within 3 miles; nearest 0.8 mi. This property type carries wider measured error; treat the estimate as a starting point. Comparable-sale caveat: the estimate is well above (more than double apart from) the $150.35/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.

Last sold: 2017-09-14 for $345,000 (recorded arm's-length sale).

Ownership tenure is not asserted for this parcel: the most recent recorded transfer is a non-market conveyance.

Source: King County recorded sales extract; buyer and seller shown only when a company or organization. Individual names are withheld.

Value over time

$0$2M$4M$6M$8M201120142017202020232026Last sold $345K · 2017$5.83M$4.86MCounty 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 $184,000 (2011) to $4,856,000 (2026), up 2539% over 15 years, per county tax rolls. The 2026 roll splits $4,856,000 into $1,872,300 land and $2,983,700 improvements.

Taxes

Permit history

Source: King County permit records (newest first).