8005 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 44% of office buildings in Mercer Island (median 11,827 SF), derived from assessor records.

Usable building area
10,567 SF, King County Assessor
County gross area
13,795 SF, King County Assessor
Excluded area
3,228 SF outside primary usable area
Lot size
25,195 SF, King County Assessor
Year built
1954, King County Assessor
Stories
2, King County Assessor
Predominant use
Office Building, King County Assessor
Assessed value
$4,788,000, per the King County Assessor (not a market appraisal)
Assessed value per usable SF
$453.11/SF, derived from assessor records
Usable area / lot
0.42, derived from assessor records
Vintage
1950s 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.

Want to talk to the owner? makeme1031 delivers a private letter directly to the owner of record. We never publish the owner's identity or address.

Own this building?

Claim privately

Claiming is for you. Your mailing address is never shown; no offer reaches you unless you opt in.

Claimed owners can confirm facts, watch the estimate, and decide whether to reply.

Received a letter about this building? It came from a real buyer through makeme1031; claiming is how you reply privately, on your terms.

Claimed owners also get Portfolio Pulse: a monthly email tracking this building's value.

Claim or manage this building

Sale history and market context

MakeMe Estimate: $5.46M (estimated market value), with a likely range of $4.57M to $6.64M (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: 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 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: 2001-05-14 for $3,600,000 (recorded arm's-length sale).

Current ownership dates to 2001 (about 25 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$2.5M$5M$7.5M$10M201120142017202020232026$5.46M$4.79MCounty 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 $3,049,100 (2011) to $4,788,000 (2026), up 57% over 15 years, per county tax rolls. The 2026 roll splits $4,788,000 into $4,787,000 land and $1,000 improvements.

Taxes