450 NW Gilman Blvd, Issaquah, WA 98027

Office · Issaquah · Seattle-Bellevue metro, WA

Imagery suggests: senior living facility, appears multi-tenant. 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 AI estimate from public imagery; may be outdated.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 79 reachable office buildings in Issaquah. Larger than 84% of office buildings in Issaquah (median 11,200 SF), derived from assessor records.

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Building size: 40,100 SF, King County Assessor
Lot size: 116,179 SF, King County Assessor
Year built: 1988, King County Assessor
Stories: 3, King County Assessor
Predominant use: Medical Center, King County Assessor
Assessed value: $13,536,600, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $337.57/SF, derived from assessor records
Lot coverage: 35%, derived from assessor records
Vintage: 1980s vintage
Zoning: MU-CI, King County
County use code: Medical/Dental Office
Construction (observed): masonry, AI estimate from public imagery
Parking (observed): surface lot, AI estimate from public imagery
Frontage (observed): interior, AI estimate from public imagery

Nearby comparable buildings

Same building type, by distance. Assessor facts only; not an opinion of value.

640 NW Gilman Blvd, Issaquah · 0.1 mi · 12,140 SF · built 1987 · assessed $347.80/SF
400 NW Gilman Blvd, Issaquah · 0.1 mi · 22,897 SF · built 2000
405 NW Gilman Blvd, Issaquah · 0.1 mi · 8,277 SF · built 1969 · assessed $343.94/SF
1301 4th Ave NW, Issaquah · 0.1 mi · 108,587 SF · built 2011 · assessed $236.20/SF
1000 5th Ave NW, Issaquah · 0.1 mi · 3,070 SF · built 1959 · assessed $356.32/SF
22500 SE 64th Pl, Issaquah · 0.2 mi · 26,188 SF · built 1999 · assessed $189.27/SF

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Sale history and market context

MakeMe Estimate: $16,445,195 (estimated market value), with a likely range of $14,862,380 to $21,427,310 (half of recent verified sales in this segment landed inside that range). Based on 55 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Last sold: 2006-04-24 for $12,175,000 (recorded arm's-length sale).

Current ownership dates to 2018 (about 8 years) per recorded transfers.

2018-06-28: $14,325,000 from 450 NW Gilman BLVD LLC to Mcoi LLC (non-market transfer), rec. 20180629001570

2006-04-24: $12,175,000 from Issaquah Medical Center LLC to 450 NW Gilman BLVD LLC, rec. 20060427000187

2000-08-28: transfer from Issaquah Medical Center Partnership to Issaquah Medical Center LLC (non-market transfer), rec. 20000831000396

1999-03-30: $922,320 from Private party to Medical Center of Issaquah (non-market transfer), rec. 199904091360

1998-12-02: transfer from Private party to Private party (non-market transfer), rec. 199901071074

Source: King County recorded sales extract; buyer and seller shown only when a company or organization. Individual names are withheld.

Value over time

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 $8,000,000 (2011) to $13,536,600 (2026), up 69% over 15 years, per county tax rolls. The 2026 roll splits $13,536,600 into $3,993,700 land and $9,542,900 improvements.

Zoning: MU-CI (per King County)

Lot: 116,179 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Medical Office 40,100 SF (county building sections)

County districts report (schools, fire, sewer, council; on kingcounty.gov)

Permit history

2022-03-02: Remodel, declared value $60,000 (Complete), permit BLD21-00278

2020-04-03: Remodel, declared value $75,000 (Screened), permit BLD19-00185

2018-11-30: Plumbing, declared value $1,500 (Complete), permit PLM18-00252

2018-11-15: Remodel, declared value $25,000 (Complete), permit BLD18-00316

2018-08-27: Remodel, declared value $154,000 (Complete), permit BLD18-00223

2017-10-19: Remodel, declared value $188,800 (Complete), permit BLD17-00287

2015-06-08: Remodel, declared value $140,000 (Complete), permit BLD15-00145

2015-06-08: Remodel, declared value $135,000 (Complete), permit BLD15-00146

2012-11-16: Remodel, declared value $75,000 (Complete), permit BLD12-00345

2012-10-04: Remodel, declared value $71,626 (Complete), permit BLD12-00281

Source: King County permit records (newest first).