MakeMe Estimate: $14.4M (estimated market value), with a likely range of $12.7M to $18.5M (half of recent verified sales in this segment landed inside that range). Based on 4 verified arm's-length comparable sales (through 2026-06-01). Not an appraisal. How this estimate works.
lower confidence: 0 comparable sales within 3 miles; nearest 3.2 mi. This property type carries wider measured error; treat the estimate as a starting point. Recent sale check: this building sold for $10,000,000 in 2026; the estimate is about 44% apart. Treat the recorded trade as strong evidence alongside the model. Comparable-sale caveat: the estimate is 35% above the $188.09/SF median of the shown comparable sales.
Recorded arm's-length sales of similar buildings nearby; nearer and more recent sales rank first. Buyer and seller names are withheld. Get this data via API.
Market context: Office in Seattle
median verified sale $364.58/SF over the trailing 24 months; 28 sales in the last 12 months and 52 in 24 (newest verified sale 2026-05); the middle 80% of recent sales traded at 0.63x to 1.44x their county assessed value, median 1.00x (52 sales with usable county values).
2022: $472.22/SF median (35 sales)
2023: $415.77/SF median (20 sales)
2024: $326.92/SF median (24 sales)
2025: $371.06/SF median (27 sales)
2026 YTD: $390.03/SF median (11 sales)
This estimate sits at 1.04x county assessed value, the 54th percentile of those recent sale premiums.
Computed from 1,574 verified arm's-length sales in King County public records (52 in the trailing 24 months). Free public records. Not an appraisal.
Last sold: 2026-01-30 for $10,000,000 (recorded arm's-length sale).
Current ownership dates to 2026 per recorded transfers.
2026-01-30: $10,000,000 from SWL LLC to 3670 Stone LLC, rec. 20260204000639
2011: transferred to SWL LLC, no consideration (3 recorded transfers, 2010 to 2011)
2005-05-03: $7,000,000 from Private party to Private party, rec. 20050504001229
2000-10-20: transfer from United Cerebral Palsy Association of King-Snohomis… to Seattle City of-Seatran R/W (non-market transfer), rec. 20001020000841
2000-02-26: $3,000,000 from Private party to United Cerebral Palsy Association (non-market transfer), rec. 20000302001586
Source: King County recorded sales extract; buyer and seller shown only when a company or organization. Individual names are withheld.
Value over time
Dark line: county assessed value per King County tax rolls. Blue line: our estimate; dashed years are a modeled backcast built from recorded arm's-length sales in the building's segment, not estimates published at the time, and years without enough sales stay unmodeled. The shaded range is the model's measured error band; about half of verified sales in the segment land inside it. Diamonds: recorded arm's-length sales. Not an appraisal. How this estimate works.
Land, site, and value history
Assessed value moved from $6,998,700 (2011) to $13,840,900 (2026), up 98% over 15 years, per county tax rolls. The 2026 roll splits $13,840,900 into $9,282,000 land and $4,558,900 improvements.
Zoning: NC2-75 (M1) (per King County)
Lot: 22,100 sq ft
Water: Water District (per King County)
Sewer: Public (per King County)
Access: Public
Street surface: Paved
Floor and use mix: Medical Office 33,292 SF; Basement, Parking 15,243 SF; Basement, Unfinished 8,001 SF (county building sections)