26821 Maple Valley Black Diamond Rd SE, Maple Valley, WA 98038

NNN Retail · Maple Valley · Seattle-Bellevue metro, WA

One of 52 reachable nnn retail buildings in Maple Valley. Larger than 8% of nnn retail buildings in Maple Valley (median 6,230 SF), derived from assessor records.

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Building size
1,736 SF, King County Assessor
Lot size
20,604 SF, King County Assessor
Year built
1969, King County Assessor
Stories
1, King County Assessor
Predominant use
C Store W/ Gas, King County Assessor
Assessed value
$1,101,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF
$634.22/SF, derived from assessor records
Lot coverage
8%, derived from assessor records
Vintage
1960s vintage
Zoning
TC, King County
County use code
Service Station

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: $1,716,144 (estimated market value), with a likely range of $1,257,750 to $2,007,063 (half of recent verified sales in this segment landed inside that range). Based on 79 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Last sold: 2007-11-07 for $765,182 (recorded arm's-length sale).

Current ownership dates to 2013 (about 13 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

$617K$1.23M$1.85M$2.47M201120142017202020232026County appraised valueEstimated value (modeled range)

Solid line: county appraised value per King County tax rolls. Shaded range: our modeled estimate for each year, built from recorded arm's-length sales in the building's segment; years without enough sales stay unmodeled. Dots: recorded arm's-length sales. Not an appraisal. How this estimate works.

Land, site, and value history

Assessed value moved from $757,200 (2011) to $1,101,000 (2026), up 45% over 15 years, per county tax rolls. The 2026 roll splits $1,101,000 into $659,300 land and $441,700 improvements.

Taxes

Permit history

Source: King County permit records (newest first).