4241 21ST AVE W
Office · Seattle · 98199
At a glance
4241 21ST AVE W in Seattle, WA is listed on the Seattle / King County property roll as “Office”, parcel (major-minor) 2771100445. The roll records 22,365 sq ft of building area, 4 floors, a 1979 build year and an assessed value of $4,284,200. It last sold for $1,850,000 in Jul 2026. 6 active business locations at this address appear in public records.
Derived from suite and floor strings in the occupancy records
Which floors show activity
- 41 on record
- 32 on record
- 21 on record
- 12 on record
Floors are read from suite numbers on Seattle / King County business records (suite 4900 → floor 49). A floor with no record is not necessarily vacant — it may be mechanical, occupied by the owner, or let to a business whose receipt carries no suite. Receipts also lag reality by months. This shows where the public record places businesses, not a rent roll or an availability report. A stretch of quiet floors is not contiguous space for rent — it is contiguous silence in the record, which is the closest thing the public record has to that question and worth exactly what it costs to check.
The building's own benchmarking filing
Energy performance
From the building's own filing under its city's benchmarking ordinance. An ENERGY STAR score of 75 or above means the building outperforms three quarters of comparable buildings nationally. It is a self-reported figure, verified by the city only to the extent the ordinance requires.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Jul 2026 | $1,850,000 | not rated | County roll | — |
Prices are the consideration recorded in Seattle / King County's public property records. Where a qualification code exists it is the assessor's judgement of whether a transfer was arm's length; transfers without one appear unrated rather than assumed clean. Whether a building is on the market today, and at what price, is not a public record and is not shown here — asking prices, listings and lease terms live in private commercial databases.
Public record — 6 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| CLOUTERA | # 206 | May 2016 | Seattle business licence | address · medium |
| ALASKA SEAFOOD COOPERATIVE | # 302 | Jan 2016 | Seattle business licence | address · medium |
| ELECTRONIC CHARTS | # 107 | Sep 2014 | Seattle business licence | address · medium |
| GROUNDFISH FORUM | # 302 | Oct 1996 | Seattle business licence | address · medium |
| F 64 INC | # 109 | Feb 1993 | Seattle business licence | address · medium |
| GREENWOOD OHLUND, PS | # 400 | Nov 1971 | Seattle business licence | address · medium |
Seattle / King County assessment roll
Parcel record
| Field | Value |
|---|---|
| parcel (major-minor) | 2771100445 |
| Site address | 4241 21ST AVE W |
| Land use (DOR) | — Office |
| Building area (actual) | 22,365 sq ft |
| Floors / units / buildings | 4 / — / 1 |
| Lot size | — |
| Year built | 1979 |
| Zoning (primary) | — |
| Land value | $1,440,000 |
| Building value | — |
| Total assessed value | $4,284,200 |
Recorded owner (assessment roll)
No owning organisation shown. Where the county roll names a private individual, the name and mailing address are not published here.
Location
- Address
- 4241 21ST AVE W
- City
- Seattle
- ZIP
- 98199
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 4241 21ST AVE W compare with other Seattle office buildings?
At 22,365 sq ft, 4241 21ST AVE W is about half the size of the average office building on the Seattle / King County roll, which comes to 46,649 sq ft across 4,289 buildings.
Its assessed value works out to $192 per square foot of building area, against $230 across all office floor area on the roll.
The last recorded sale priced it at $83 per square foot.
Does the owner of 4241 21ST AVE W hold other Seattle office property?
Seattle / King County's published roll does not include owner names, so no owner is shown for any parcel in this metro.
What has happened at 4241 21ST AVE W recently?
1 recorded transfer is on file for this parcel, the latest dated Jul 2026.
The building files energy-benchmarking disclosures — 1 report year are matched to this parcel.
What does “Office” mean for this parcel?
The Seattle / King County roll classifies parcel (major-minor) 2771100445 as “Office”. BuildingCensus includes a parcel in its office census when the roll gives it an office-class use, so the label is the county's, not an inference.
Frequently asked questions
Who owns 4241 21ST AVE W?
Seattle / King County's published roll does not include owner names, so no owner is shown.
What companies have offices at 4241 21ST AVE W?
6 active business locations at this building appear in Seattle / King County public records, including CLOUTERA, ALASKA SEAFOOD COOPERATIVE, ELECTRONIC CHARTS, GROUNDFISH FORUM, F 64 INC. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 4241 21ST AVE W?
The Seattle / King County roll records 22,365 sq ft of building area, 4 floors, a build year of 1979.
What is the assessed value of 4241 21ST AVE W?
$4,284,200 on the Seattle / King County roll. Assessed values are taxable-roll figures, not market prices.
When did 4241 21ST AVE W last sell?
The last recorded transfer was in Jul 2026 for $1,850,000 ($83 per square foot).
What is the parcel (major-minor) for 4241 21ST AVE W?
Parcel (major-minor) 2771100445, site address 4241 21ST AVE W, Seattle. It is the key to look the parcel up in the King County Assessor bulk extracts and Seattle open data (Seattle / King County).
More around 4241 21ST AVE W
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- Seattle / King County — King County Assessor bulk extracts and Seattle open data. Washington law restricts commercial use of lists of individuals, so this metro is built without personal names by design: the county's name-stripped account file provides mailing addresses (portfolios group by mailing cluster, unnamed), sales show price and date but never buyer or seller, and tenants are business licence trade names.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
Working with Seattle office parcels? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
Dataset updated . Source: Seattle / King County assessment roll, parcel (major-minor) 2771100445.
About this data
Source: King County Assessor bulk extracts and Seattle open data (Seattle / King County), as published September 20, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “4241 21ST AVE W, Seattle, WA (parcel (major-minor) 2771100445)”, https://buildingcensus.com/offices/seattle/office-building-47587604 (data as of September 20, 2026).