509 6th St S, Kirkland, WA 98033

Office · Kirkland · Seattle-Bellevue metro, WA

Imagery suggests: modern 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 AI estimate from public imagery; may be outdated.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 146 reachable office buildings in Kirkland. Larger than 97% of office buildings in Kirkland (median 13,229 SF), derived from assessor records.

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Building size: 324,923 SF, King County Assessor
Lot size: 124,099 SF, King County Assessor
Year built: 2021, King County Assessor
Stories: 2, King County Assessor
Predominant use: Google Iii, King County Assessor
Assessed value: $62,212,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $191.47/SF, derived from assessor records
Lot coverage: 262%, derived from assessor records
Vintage: 2020s vintage
Zoning: LIT, King County
County use code: Office Building
Construction (observed): steel glass, AI estimate from public imagery
Parking (observed): none visible, 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.

512 6th St S, Kirkland · 0 mi · 6,802 SF · built 1992 · assessed $332.95/SF
600 6th St S, Kirkland · 0.1 mi · 29,043 SF · built 2001 · assessed $192.43/SF
620 5th Ave S, Kirkland · 0.1 mi · 110,661 SF · built 2024 · assessed $253.83/SF
630 6th St S, Kirkland · 0.1 mi · 4,679 SF · built 2013 · assessed $326.95/SF
720 6th St S, Kirkland · 0.1 mi · 8,190 SF · built 1990 · assessed $175.70/SF
777 6th St S, Kirkland · 0.1 mi · 358,798 SF · built 2008 · assessed $198.25/SF

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Sale history and market context

MakeMe Estimate: $91,369,833 (estimated market value), with a likely range of $88,976,291 to $120,724,728 (half of recent verified sales in this segment landed inside that range). Based on 185 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works.

Last sold: 1995-07-21 for $3,120,000 (recorded arm's-length sale).

Current ownership dates to 2020 (about 6 years) per recorded transfers.

7 administrative transfers (no consideration), 1999 to 2020

1995-07-21: $3,120,000 from Cash Flow Partners to Private party, rec. 199507260896

1995-07-20: transfer from Private party to Private party (non-market transfer), rec. 199507260897

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 $5,512,000 (2011) to $62,212,000 (2026), up 1029% over 15 years, per county tax rolls. The 2026 roll splits $62,212,000 into $10,548,400 land and $51,663,600 improvements.

Zoning: LIT (per King County)

Lot: 124,099 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 188,245 SF; Office Building 136,678 SF (county building sections)

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

Permit history

2022-12-30: Electrical, declared value $66,500 (Complete), permit ELV22-10009

2022-10-20: Electrical, declared value $46,000 (Complete), permit ELV22-08199

2021-08-06: Accessory, New, declared value $1,250,000 (Complete), permit BNO21-01366

2020-10-22: Plumbing, declared value $1,800,000 (Complete), permit PNR20-05281

2020-07-01: Building, New, declared value $48,362,057 (Complete), permit BNR19-02595

2020-06-29: Demolition, declared value $500,000 (Complete), permit DEM20-01986

2017-01-17: Building, New, declared value $12,000 (Complete), permit BNR16-09989

2014-08-22: Remodel, declared value $150,000 (Complete), permit BNR14-03895

2014-08-22: Remodel, declared value $64,000 (Complete), permit PNR14-05097

2014-07-09: Remodel, declared value $150,000 (Complete), permit BNR14-04007

Source: King County permit records (newest first).