31109 3rd Ave, Black Diamond, WA 98010

Small-Bay Industrial · Black Diamond · Seattle-Bellevue metro, WA

One of 10 reachable small-bay industrial buildings in Black Diamond. Larger than 20% of small-bay industrial buildings in Black Diamond (median 2,939 SF), derived from assessor records.

Usable building area
2,002 SF, King County Assessor
Lot size
1,363,863 SF, King County Assessor
Year built
1946, King County Assessor
Stories
1, King County Assessor
Predominant use
Service Garage, King County Assessor
Assessed value
$7,541,700, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$3,767/SF, derived from assessor records
Usable area / lot
0, derived from assessor records
Vintage
1940s vintage
Zoning
B/IP, King County
County use code
Service Building

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: $8.48M (estimated market value), with a likely range of $5.94M to $10.7M (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). The county roll carries a nominal improvement value for this parcel, so the estimate leans on comparable sales and the county-confirmed building area rather than the county land and improvement split. Not an appraisal. How this estimate works.

lower confidence: 0 comparable sales within 3 miles; nearest 9.8 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 3x apart from) the $316.02/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: 2018-07-10 for $6,562,500 (recorded arm's-length sale).

Current ownership dates to 2018 (about 8 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$15M201120142017202020232026Last sold $6.56M · 2018$8.48M$7.54MCounty 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 $1,092,000 (2011) to $7,541,700 (2026), up 591% over 15 years, per county tax rolls. The 2026 roll splits $7,541,700 into $7,501,200 land and $40,500 improvements.

Taxes