800 5th Ave, Seattle, WA 98104

Office · Seattle · Seattle-Bellevue metro, WA

Imagery suggests: office building, 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 AI estimate from public imagery; may be outdated.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 99% of office buildings in Seattle (median 20,410 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: 1,216,017 SF, King County Assessor
Lot size: 61,440 SF, King County Assessor
Year built: 1981, King County Assessor
Stories: 42, King County Assessor
Predominant use: Class A Office, King County Assessor
Assessed value: $206,122,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $169.51/SF, derived from assessor records
Lot coverage: 1979%, derived from assessor records
Vintage: 1980s vintage
Zoning: DOC1 U/450/U, King County
County use code: Office Building
Construction (observed): steel glass, 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.

711 6th Ave, Seattle · 0.1 mi · 1,195,387 SF · built 1990
505 Madison St, Seattle · 0.1 mi · 990,000 SF · built 2017 · assessed $245.67/SF
411 Columbia St, Seattle · 0.1 mi · 1,952,220 SF · built 1985 · assessed $193.35/SF
909 5th Ave, Seattle · 0.1 mi · 777,268 SF · built 1973 · assessed $170.21/SF
904 7th Ave, Seattle · 0.1 mi · 306,490 SF · built 2008 · assessed $274.84/SF
600 5th Ave, Seattle · 0.1 mi · 310,490 SF · built 2001

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.

Sale history and market context

MakeMe Estimate: $176,116,219 (estimated market value), with a likely range of $159,165,408 to $229,471,099 (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: 2014-09-25 for $165,000,000 (recorded arm's-length sale).

Current ownership dates to 2019 (about 7 years) per recorded transfers.

2019-01-25: $539,199,583 from 800 Fifth Avenue Partners Owner LLC to BPP 800 Fifth Property Owner LLC, rec.

2014-09-25: $165,000,000 from James Campbell CO LLC to 800 Fifth Avenue Partners Owner LLC, rec. 20140925001292

2014-09-23: $111,362,225 from Block 24 Seattle LTD LP to 800 Fifth Avenue Partners Owner LLC, rec. 20140925001293

2 administrative transfers (no consideration), 1987 to 2005

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 $168,726,000 (2011) to $206,122,000 (2026), up 22% over 15 years, per county tax rolls. The 2026 roll splits $206,122,000 into $98,304,000 land and $107,818,000 improvements.

Zoning: DOC1 U/450/U (per King County)

Lot: 61,440 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Office Building 1,014,896 SF; Underground Parking Structure 201,121 SF (county building sections)

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

Permit history

2026-01-15: Remodel, declared value $863,131, permit 7088830-CN

2025-12-09: Remodel, permit 7115195-BK

2025-11-20: Remodel, permit 7112246-BK

2025-05-16: Remodel (Screened), permit 6909653-BK

2024-06-24: Remodel, declared value $1,500,000 (Complete), permit 7023386-CN

2022-12-15: Remodel (Screened), permit 6925613-BK

2022-07-25: Remodel (Screened), permit 6910390-BK

2021-06-04: Remodel, declared value $4,100,000 (Complete), permit 6787069-CN

2021-01-08: Remodel (Screened), permit 6805023-BK

2019-10-31: Remodel, declared value $269,896 (Complete), permit 6754734-CN

Source: King County permit records (newest first).