400 Wall St, Seattle, WA 98121

Multifamily · Seattle · Seattle-Bellevue metro, WA

One of 5,391 reachable multifamily buildings in Seattle. Larger than 96% of multifamily buildings in Seattle (median 9,444 SF), derived from assessor records.

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Building size: 160,141 SF, King County Assessor
Lot size: 25,440 SF, King County Assessor
Year built: 2000, King County Assessor
Stories: 6, King County Assessor
Predominant use: Sidney Apts, King County Assessor
Units: 128, King County Assessor
Assessed value: $49,559,000, per the King County Assessor (not a market appraisal)
Assessed value per building SF: $309.47/SF, derived from assessor records
Lot coverage: 629%, derived from assessor records
Vintage: 2000s vintage
Zoning: DMR/C 280/125, King County
County use code: Apartment(Mixed Use)

Nearby comparable buildings

Same building type, by distance. Assessor facts only; not an opinion of value.

420 Wall St, Seattle · 0 mi · 44,736 SF · built 1925 · assessed $730.13/SF
2515 4th Ave, Seattle · 0 mi · 321,050 SF · built 1990 · assessed $267.82/SF
2400 4th Ave, Seattle · 0.1 mi · 328,947 SF · built 1998 · assessed $303.48/SF
2602 4th Ave, Seattle · 0.1 mi · 22,400 SF · built 1923 · assessed $313.66/SF
420 Vine St, Seattle · 0.1 mi · 33,880 SF · built 1925 · assessed $243.51/SF
2550 3rd Ave, Seattle · 0.1 mi · 192,077 SF · built 2000 · assessed $302.71/SF

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Sale history and market context

MakeMe Estimate: $46,890,686 (estimated market value), with a likely range of $42,830,159 to $48,391,573 (half of recent verified sales in this segment landed inside that range). Based on 98 verified arm's-length comparable sales (through 2026-05-29). Not an appraisal. How this estimate works. About $366K per unit at the midpoint (128 units).

Current ownership dates to 2008 (about 18 years) per recorded transfers.

2008-08-13: $40,550,000 from Wallfour Realty Holding Company to Somerset Green Townhouses Associates LLC (part of a 2-parcel sale; price is the whole deal), rec. 20080818000478

2000-10-05: $17,769,000 from Fourth and Wall LLC to Wallfour Realty Holding CO (part of a 2-parcel sale; price is the whole deal), rec. 20001006001064

1999-02-09: $2,667,315 from Private party to Fourth & Wall LLC (part of a 2-parcel sale; price is the whole deal), rec. 199902091294

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 $26,439,000 (2011) to $49,559,000 (2026), up 87% over 15 years, per county tax rolls. The 2026 roll splits $49,559,000 into $25,185,600 land and $24,373,400 improvements.

Zoning: DMR/C 280/125 (per King County)

Lot: 25,440 sq ft

Rated views: Territorial, Seattle skyline

Water: Water District (per King County)

Sewer: Public (per King County)

Access: Public

Street surface: Paved

Floor and use mix: Apartment 113,000 SF; Basement, Parking 40,377 SF; Retail Store 6,764 SF (county building sections)

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

Permit history

2025-12-22: Other, declared value $20,000 (Screened), permit 7122246-RF

2023-07-10: Other (Screened), permit 6974372-RF

2022-10-17: Remodel (Screened), permit 6875626-CN

2022-01-17: Remodel, declared value $80,000 (Complete), permit 6854664-CN

2019-12-12: Remodel, declared value $78,000 (Complete), permit 6762634-CN

2014-02-05: Remodel, declared value $18,000 (Screened), permit 6382535

2011-01-10: Remodel, declared value $40,000 (Screened), permit 6269674

1998-02-28: Building, New (Complete), permit BP9999

Source: King County permit records (newest first).