600 Broadway, Seattle, WA 98122

Office · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: mid-rise office, 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 AI estimate from public imagery; may be outdated.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 957 reachable office buildings in Seattle. Larger than 89% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size: 289,419 SF, King County Assessor
Lot size: 32,731 SF, King County Assessor
Year built: 1990, King County Assessor
Stories: 5, King County Assessor
Predominant use: Clinic, King County Assessor
Assessed value: $40,936,600, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $141.44/SF, derived from assessor records
Lot coverage: 884%, derived from assessor records
Vintage: 1990s vintage
Zoning: MIO-90-NC3-95 (M), King County
County use code: Medical/Dental Office
Construction (observed): masonry, AI estimate from public imagery
Parking (observed): structured, AI estimate from public imagery
Frontage (observed): mid block, AI estimate from public imagery

Nearby comparable buildings

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

700 Broadway, Seattle · 0 mi · 83,540 SF · built 1963 · assessed $247.81/SF
720 Broadway, Seattle · 0.1 mi · 44,660 SF · built 1988 · assessed $482.34/SF
801 Broadway, Seattle · 0.1 mi · 250,902 SF · built 1970 · assessed $192.85/SF
515 Minor Ave, Seattle · 0.1 mi · 177,089 SF · built 1988 · assessed $195.90/SF
1395 Marion St, Seattle · 0.1 mi · 12,000 SF · built 2016 · assessed $299.06/SF
1124 Columbia St, Seattle · 0.2 mi · 383,914 SF · built 1975 · assessed $237.59/SF

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Sale history and market context

MakeMe Estimate: $42,246,193 (estimated market value), with a likely range of $38,180,087 to $55,044,790 (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: 2004-12-14 for $31,500,000 (recorded arm's-length sale).

Current ownership dates to 2004 (about 22 years) per recorded transfers.

2004-12-14: $31,500,000 from Private party to HCP 600 Broadway Mob LLC, rec. 20041217000683

2004-06-30: transfer from Wells Fargo Bank NW NA to Private party (non-market transfer), rec. 20040702000533

1999-06-30: $29,700,000 from Broadway Medical Center LTD PTSHP to First Security Bank NA (non-market transfer), rec. 19990630001565

1998-12-30: transfer from Broadway Medical Center LP to Seattle University (non-market transfer), rec. 199902100822

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 $32,815,400 (2011) to $40,936,600 (2026), up 25% over 15 years, per county tax rolls. The 2026 roll splits $40,936,600 into $15,330,600 land and $25,606,000 improvements.

Zoning: MIO-90-NC3-95 (M) (per King County)

Lot: 32,731 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Underground Parking Structure 159,157 SF; Medical Office 130,262 SF (county building sections)

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

Permit history

2025-09-09: Remodel, permit 7100213-BK

2024-03-05: Electrical, declared value $6,401,400 (Screened), permit 7012671-EL

2024-03-05: Remodel (Screened), permit 7005729-BK

2024-02-06: Remodel, declared value $200,000 (Screened), permit 6997982-CN

2023-10-04: Remodel, declared value $150,000 (Complete), permit 6947129-CN

2023-01-12: Remodel, declared value $46,000 (Complete), permit 6939842-CN

2021-12-14: Remodel, declared value $1,518,334 (Screened), permit 6843380-CN

2019-08-16: Remodel, declared value $20,000 (Screened), permit 6743845-CN

2018-02-05: Remodel, declared value $182,442 (Screened), permit 6640771

2016-07-25: Remodel, declared value $75,000 (Screened), permit 6541386

Source: King County permit records (newest first).