4400 88th Ave SE, Mercer Island, WA 98040
Commercial · Mercer Island · Seattle-Bellevue metro, WA
Imagery suggests: single-story service building. AI estimate from public imagery. In recent public imagery (2026-06), the building appears well maintained. AI estimate from public imagery; may be outdated.
One of 23 reachable commercial buildings in Mercer Island. Larger than 17% of commercial buildings in Mercer Island (median 41,832 SF), derived from assessor records.
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.
Claim or manage this building- Building size
- 14,650 SF, King County Assessor
- Lot size
- 36,000 SF, King County Assessor
- Year built
- 1990, King County Assessor
- Stories
- 2, King County Assessor
- Predominant use
- Mercer Island Library, King County Assessor
- Assessed value
- $0, per the King County Assessor (not a market appraisal)
- Lot coverage
- 41%, derived from assessor records
- Vintage
- 1990s vintage
- Zoning
- R-9.6, King County
- County use code
- Governmental Service
- Construction (observed)
- masonry, AI estimate from public imagery
- Parking (observed)
- surface lot, AI estimate from public imagery
Nearby comparable buildings
Same building type, by distance. Assessor facts only; not an opinion of value.
- 9100 SE 42nd St, Mercer Island · 0.4 mi · 206,500 SF · built 1955
- 4120 86th Ave SE, Mercer Island · 0.4 mi · 44,968 SF · built 2010
- 4030 86th Ave SE, Mercer Island · 0.5 mi · 77,277 SF · built 2017
- 8815 SE 40th St, Mercer Island · 0.5 mi · 16,908 SF · built 1973
- 4141 81st Ave SE, Mercer Island · 0.6 mi · 35,785 SF · built 1964
- 5017 90th Ave SE, Mercer Island · 0.6 mi · 15,652 SF · built 1965 · assessed $303.06/SF
Want to talk to the owner? makeme1031 delivers a private, principal-to-principal letter to the owner of record. We never publish the owner's identity or address.