6100 4th Ave S, Seattle, WA 98108

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 AI estimate from public imagery; may be outdated.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 87% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size: 238,148 SF, King County Assessor
Lot size: 94,533 SF, King County Assessor
Year built: 1975, King County Assessor
Stories: 5, King County Assessor
Predominant use: Class A Multi-Tenant Office, King County Assessor
Assessed value: $22,549,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $94.68/SF, derived from assessor records
Lot coverage: 252%, derived from assessor records
Vintage: 1970s vintage
Zoning: MML U/85, King County
County use code: Office Building
Construction (observed): steel glass, 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.

500 S Michigan St, Seattle · 0.1 mi · 3,380 SF · built 2005 · assessed $817.10/SF
550 S Michigan St, Seattle · 0.1 mi · 4,567 SF · built 1978 · assessed $214.50/SF
303 S Michigan St, Seattle · 0.2 mi · 6,350 SF · built 1967 · assessed $360.36/SF
6520 4th Ave S, Seattle · 0.2 mi · 1,500 SF · built 1984 · assessed $1,208/SF
6346 6th Ave S, Seattle · 0.2 mi · 2,620 SF · built 1905 · assessed $111.22/SF
6527 4th Ave S, Seattle · 0.2 mi · 2,621 SF · built 2002 · assessed $336.67/SF

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Sale history and market context

MakeMe Estimate: $23,687,851 (estimated market value), with a likely range of $21,407,946 to $30,864,149 (half of recent verified sales in this segment landed inside that range). Based on 12 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Last sold: 2004-04-05 for $850,000 (recorded arm's-length sale).

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

2018-08-02: $64,925,000 from Benaroya-Capital CO LLC to Trupanion-Apic LLC (part of a 4-parcel sale; price is the whole deal), rec.

2005-01-21: $26,300,000 from Bay West Gift Center LLC to Benaroya Capital CO LLC (part of a 5-parcel sale; price is the whole deal), rec. 20050125000499

2004-04-05: $850,000 from Private party to Bay West Gift Center LLC, rec. 20040406000862

1999-08-30: $6,620,737 from Pacific Northwest Group B to Bay West Gift Center, rec. 19990902001286

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 $23,254,100 (2011) to $22,549,000 (2026), down 3% over 15 years, per county tax rolls. The 2026 roll splits $22,549,000 into $5,671,900 land and $16,877,100 improvements.

Zoning: MML U/85 (per King County)

Lot: 94,533 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Office Building 238,148 SF (county building sections)

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

Permit history

2018-09-14: Remodel, declared value $250,000 (Complete), permit 6643698-CN

2017-03-09: Remodel, declared value $323,750 (Screened), permit 6561780

2017-02-23: Remodel, declared value $1,260,000 (Screened), permit 6561668

2016-12-05: Remodel, declared value $697,330 (Screened), permit 6563739

2016-09-03: Remodel, declared value $250,000 (Screened), permit 6538933

2016-06-17: Remodel, declared value $228,954 (Screened), permit 6515167

2016-05-29: Remodel, declared value $150,000 (Screened), permit 6504920

2016-03-08: Remodel, declared value $323,750 (Screened), permit 6496759

2016-02-20: Remodel, declared value $2,500,000 (Screened), permit 6497424

2015-10-27: Remodel, declared value $500,000 (Screened), permit 6405339

Source: King County permit records (newest first).