1200 S Dearborn St, Seattle, WA 98144

Office · Seattle · Seattle-Bellevue metro, WA

One of 957 reachable office buildings in Seattle. Larger than 86% of office buildings in Seattle (median 20,410 SF), derived from assessor records.

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Building size: 217,223 SF, King County Assessor
Lot size: 57,600 SF, King County Assessor
Year built: 2016, King County Assessor
Stories: 6, King County Assessor
Predominant use: Public Storage - 6-Story Bldg, King County Assessor
Assessed value: $40,698,800, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $187.36/SF, derived from assessor records
Lot coverage: 377%, derived from assessor records
Vintage: 2010s vintage
Zoning: DMC 85/75-170, King County
County use code: Office Building
Construction (observed): metal, AI estimate from public imagery
Parking (observed): surface lot, 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.

606 12th Ave S, Seattle · 0.1 mi · 21,600 SF
1225 S Weller St, Seattle · 0.1 mi · 70,332 SF · built 2001 · assessed $185.92/SF
1227 S Weller St, Seattle · 0.1 mi · 7,500 SF · built 1953 · assessed $318.47/SF
515 10th Ave S, Seattle · 0.2 mi · 3,536 SF · built 2009 · assessed $273.08/SF
510 Rainier Ave S, Seattle · 0.2 mi · 4,700 SF · built 1978 · assessed $245.96/SF
502 Rainier Ave S, Seattle · 0.2 mi · 14,826 SF · built 2002 · assessed $160.17/SF

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Sale history and market context

MakeMe Estimate: $42,851,477 (estimated market value), with a likely range of $38,727,114 to $55,833,447 (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: 2015-06-23 for $3,000,000 (recorded arm's-length sale).

Current ownership dates to 2015 (about 11 years) per recorded transfers.

2015-06-23: $3,000,000 from Columbia State Bank to Private party, rec. 20150629001113

2010-04-19: $4,323,365 from Private party to Columbia State Bank (non-market transfer), rec. 20100421000455

2007-10-11: transfer from Dearborn Terrace Associates LLC to Private party (non-market transfer), rec. 20071011001699

2007-10-09: $6,150,000 from Private party to Private party, rec. 20071017002191

4 administrative transfers (no consideration), 1999 to 2003

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 $5,473,000 (2011) to $40,698,800 (2026), up 644% over 15 years, per county tax rolls. The 2026 roll splits $40,698,800 into $16,128,000 land and $24,570,800 improvements.

Zoning: DMC 85/75-170 (per King County)

Lot: 57,600 sq ft

Nuisance flags: Traffic noise, Other nuisance

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Mini Warehouse, Hi-Rise 199,001 SF; Parking Structure 15,718 SF; Office Building 1,444 SF; Apartment 1,060 SF (county building sections)

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

Permit history

2023-07-18: Electrical, declared value $8,900 (Screened), permit 6976051-EL

2023-04-25: Remodel, declared value $25,000 (Screened), permit 6883943-CN

2022-12-22: Remodel, declared value $80,000 (Screened), permit 6930057-CN

2022-07-25: Remodel, declared value $20,000 (Screened), permit 6884707-CN

2022-03-25: Remodel, declared value $30,000 (Screened), permit 6864789-CN

2015-12-02: Building, New, declared value $23,006,329 (Complete), permit 6461700

2015-08-24: Building, New, declared value $2,400,000 (Complete), permit 6461699

2015-06-29: Demolition (Complete), permit 6461635

Source: King County permit records (newest first).