7900 SE 28th St, Mercer Island, WA 98040

Office · Mercer Island · Seattle-Bellevue metro, WA

One of 34 reachable office buildings in Mercer Island. Larger than 91% of office buildings in Mercer Island (median 11,827 SF), derived from assessor records.

Usable building area
36,337 SF, King County Assessor
County gross area
78,890 SF, King County Assessor
Excluded area
42,553 SF outside primary usable area
Lot size
38,811 SF, King County Assessor
Year built
1985, King County Assessor
Stories
2, King County Assessor
Buildings on parcel
2, King County Assessor
Predominant use
Parking Garage, King County Assessor
Assessed value
$12,153,000, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$334.45/SF, derived from assessor records
Usable area / lot
0.94, derived from assessor records
Vintage
1980s vintage
Zoning
TC, King County
County use code
Office 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: $14M (estimated market value), with a likely range of $12.3M to $16.1M (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: 1 comparable sale within 3 miles; nearest 2.7 mi. This property type carries wider measured error; treat the estimate as a starting point. Comparable-sale caveat: the estimate is 37% below the $610.31/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: 2005-07-15 for $11,575,000 (recorded arm's-length sale).

Current ownership dates to 2005 (about 21 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$30M201120142017202020232026$14M$12.2MCounty 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 $9,547,900 (2011) to $12,153,000 (2026), up 27% over 15 years, per county tax rolls. The 2026 roll splits $12,153,000 into $8,538,400 land and $3,614,600 improvements.

Taxes

Permit history

Source: King County permit records (newest first).