999 3rd Ave, Seattle, WA 98104

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 AI estimate from public imagery; may be outdated.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 99% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size: 1,325,986 SF, King County Assessor
Lot size: 56,400 SF, King County Assessor
Year built: 1983, King County Assessor
Stories: 47, King County Assessor
Predominant use: Ofc Bldg, King County Assessor
Assessed value: $224,971,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $169.66/SF, derived from assessor records
Lot coverage: 2351%, 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): street only, 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.

808 2nd Ave, Seattle · 0.1 mi · 95,373 SF · built 1906 · assessed $130.14/SF
925 4th Ave, Seattle · 0.1 mi · 1,052,469 SF · built 2002 · assessed $200.93/SF
915 2nd Ave, Seattle · 0.1 mi · 861,221 SF · built 1973
1015 3rd Ave, Seattle · 0.1 mi · 293,576 SF · built 1998 · assessed $204.20/SF
1000 2nd Ave, Seattle · 0.1 mi · 589,921 SF · built 1986 · assessed $203.80/SF
821 2nd Ave, Seattle · 0.1 mi · 384,302 SF · built 1929 · assessed $123.66/SF

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Sale history and market context

MakeMe Estimate: $191,305,186 (estimated market value), with a likely range of $172,892,469 to $249,261,604 (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: 2013-05-31 for $389,900,000 (recorded arm's-length sale).

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

2 administrative transfers (no consideration), 2013 to 2019

2013-05-31: $389,900,000 from 999 Third Ave Property LLC to 999 Thirst Avenue REIT, rec. 20130531001195

2007-04-10: $402,966,200 from Wa-999 Third Avenue LLC to 999 Third Avenue Property LLC, rec. 20070424000114

5 administrative transfers (no consideration), 1995 to 2006

1994-11-30: $6,600,000 from First Interstate Bank of Wash to Private party, rec. 199412051110

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 $207,125,000 (2011) to $224,971,000 (2026), up 9% over 15 years, per county tax rolls. The 2026 roll splits $224,971,000 into $90,240,000 land and $134,731,000 improvements.

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

Lot: 56,400 sq ft

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Floor and use mix: Office Building 1,052,289 SF; Underground Parking Structure 242,952 SF; Retail Store 22,543 SF; Basement, Storage 8,202 SF (county building sections)

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

Permit history

2025-08-08: Remodel, permit 7097046-BK

2025-06-24: Remodel, declared value $32,000 (Screened), permit 7080164-CN

2023-12-29: Remodel, declared value $251,387 (Complete), permit 6993213-CN

2023-02-06: Remodel, declared value $175,000 (Complete), permit 6945837-CN

2023-01-24: Remodel, declared value $200,000 (Complete), permit 6939460-CN

2020-01-28: Remodel, declared value $127,148 (Complete), permit 6763063-CN

2019-06-10: Remodel, declared value $200,000 (Complete), permit 6708476-CN

2019-01-25: Remodel, declared value $10,111,785 (Complete), permit 6626779-CN

2019-01-16: Remodel, declared value $350,000 (Complete), permit 6646969-CN

2018-04-26: Remodel, declared value $166,000 (Complete), permit 6658781

Source: King County permit records (newest first).