1040 12th Ave NW, Issaquah, WA 98027

Commercial · Issaquah · Seattle-Bellevue metro, WA

One of 158 reachable commercial buildings in Issaquah. Larger than 85% of commercial buildings in Issaquah (median 3,140 SF), derived from assessor records.

Usable building area
53,566 SF, King County Assessor
Lot size
176,567 SF, King County Assessor
Year built
1987, King County Assessor
Stories
2, King County Assessor
Predominant use
School(private), King County Assessor
Assessed value
$25,702,300, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$479.82/SF, derived from assessor records
Usable area / lot
0.3, derived from assessor records
Vintage
1980s vintage
Zoning
UC, King County
County use code
School(Private)

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: $20.2M (estimated market value), with a likely range of $16.8M to $24.4M (half of recent verified sales in this segment landed inside that range). Based on 6 verified arm's-length comparable sales (through 2026-06-01). Not an appraisal. How this estimate works.

lower confidence: 0 comparable sales within 3 miles; nearest 14.3 mi. This property type carries wider measured error; treat the estimate as a starting point. Recent sale check: this building sold for $12,250,000 in 2023; the estimate is about 65% apart. Treat the recorded trade as strong evidence alongside the model. Comparable-sale caveat: the estimate is 53% above the $246.41/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: Commercial in Issaquah

median verified sale $468.09/SF over the trailing 24 months; 6 sales in the last 12 months and 9 in 24 (newest verified sale 2026-01); the middle 80% of recent sales traded at 0.91x to 1.27x their county assessed value, median 1.03x (9 sales with usable county values).

  • 2023: $600/SF median (4 sales)
  • 2025: $468.09/SF median (6 sales)

This estimate sits at 0.79x county assessed value, the 0th percentile of those recent sale premiums.

Computed from 172 verified arm's-length sales in King County public records (9 in the trailing 24 months). Free public records. Not an appraisal.

Last sold: 2023-12-28 for $12,250,000 (recorded arm's-length sale).

Current ownership dates to 2023 (about 3 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$10M$20M$30M$40M20252026$20.2M$25.7MCounty assessed valueMakeMe Estimate range

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 $23,062,100 (2025) to $25,702,300 (2026), up 11% over 1 years, per county tax rolls. The 2026 roll splits $25,702,300 into $11,351,700 land and $14,350,600 improvements.

Taxes

Permit history

Source: King County permit records (newest first).