COSTCO WHOLESALE CORP
6 office properties in Seattle / King County recorded to 2 owner entities mailing to 999 LAKE DR, ISSAQUAH, WA. likely one owner
At a glance
COSTCO WHOLESALE CORP is recorded as the owner of 6 office properties (6 parcels) in Seattle / King County, totalling 1.6M sq ft of building area with $277.1M of assessed value. The holdings sit in 2 owner entities that share one tax-bill mailing address in ISSAQUAH, WA — and a name root, which is how a single sponsor usually holds property.
County assessment roll
Properties
| Building | Submarket | Sq ft | Assessed | Last sold | Tenants |
|---|---|---|---|---|---|
| 1045 LAKE DR | Seattle | 1.2M | $213.3M | $3,149,000 · May 2017 | 0 |
| NORTH CENTRAL PLAZA I | Dallas | 204K | $14.1M | — | 14 |
| 1605 NW SAMMAMISH RD | Seattle | 96.5K | $23.3M | — | 0 |
| 8301 SOUTH PARK CIR | Orlando | 69.7K | $18.9M | — | 0 |
| 1530 11TH AVE NW | Seattle | 15.1K | $5.2M | $6,400,000 · Aug 2020 | 0 |
| 1510 11TH AVE NW | Seattle | 6.7K | $2.2M | $6,450,000 · Oct 2025 | 0 |
Names on the deeds
Owner entities at this address
- COSTCO WHOLESALE CORPORATION
- COSTCO WHOLESALE CORP
How this group was built. These entities share both a mailing address and a name root, which is how a single sponsor usually holds property — one entity per building.The county records an owner and a mailing address for every parcel; this page collects the office parcels whose owners mail to the same address, and counts buildings rather than parcels using the county's own condo-to-building link. Lease terms, rents and the identity of a manager acting for the owner are not public records and are not shown.
Where are COSTCO WHOLESALE CORP's office buildings?
The 6 properties are spread across 3 cities, led by Seattle (4), Dallas (1), Orlando (1).
The largest is 1045 LAKE DR in Seattle at 1.2M sq ft over 9 floors.
Recorded build years run from 1982 to 2008.
How large is this portfolio within Seattle's office market?
Its 1.6M sq ft is 0.79% of the 200.1M sq ft of office building area on the Seattle / King County roll.
Its $277.1M of assessed value is 0.60% of the metro's office total.
It holds 6 of the metro's 4,289 office buildings.
3 of its parcels carry a recorded sale price; the most recent was 1510 11TH AVE NW in Oct 2025 for $6,450,000.
Frequently asked questions
How many office buildings does COSTCO WHOLESALE CORP own in Seattle?
6 office properties (6 parcels) on the Seattle / King County roll, counted by building rather than by condo parcel.
What is COSTCO WHOLESALE CORP's largest office building?
1045 LAKE DR, Seattle — 1.2M sq ft, assessed at $213.3M.
What are COSTCO WHOLESALE CORP's office properties worth?
Their combined assessed value on the current Seattle / King County roll is $277,071,624. Assessed values are taxable-roll figures, not market prices.
Are these properties owned by one company?
These entities share both a mailing address and a name root, which is how a single sponsor usually holds property — one entity per building. 2 owner entities share the mailing address. It is evidence of common ownership, not proof of it.
When did one of COSTCO WHOLESALE CORP's Seattle office properties last change hands?
The most recent recorded transfer among these parcels is 1510 11TH AVE NW, Oct 2025, for $6,450,000.
Related
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.
Dataset updated . Derived from public data sources.
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, “COSTCO WHOLESALE CORP — Seattle office property holdings”, https://buildingcensus.com/offices/seattle/owners/costco-wholesale-corp-7974e5 (data as of September 20, 2026).