901 K ST NW # 1
Office · Washington · 20001
At a glance
901 K ST NW # 1 in Washington, DC is listed on the Washington, DC property roll as “Office”, SSL 03712001. The roll records 193,114 sq ft of building area, a 2009 build year and an assessed value of $84,300,000. It last sold for $84,300,000 in Jun 2025. 2 active business locations at this address appear in public records.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Jun 2025 | $84,300,000 | not rated | County roll | — |
Prices are the consideration recorded in Washington, DC'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 — 2 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| Microsoft Corporationvia MICROSOFT CORPORATION | 1100 | Apr 2026 | DC business licence | folio match · high |
| AIG Employee Services, Inc. | — | Jul 2024 | DC business licence | folio match · high |
Washington, DC assessment roll
Parcel record
| Field | Value |
|---|---|
| SSL | 03712001 |
| Site address | 901 K ST NW # 1 |
| Land use (DOR) | 057 — Office |
| Building area (actual) | 193,114 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | 21,667 sq ft |
| Year built | 2009 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $84,300,000 |
Recorded owner (assessment roll)
901 K STREET OWNER, L.P.
Owner mailing address: 235 MONTGOMERY ST # 16FLOOR, SAN FRANCISCO, CA, 94104
Location
- Address
- 901 K ST NW # 1
- City
- Washington
- ZIP
- 20001
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 901 K ST NW # 1 compare with other Washington office buildings?
At 193,114 sq ft, 901 K ST NW # 1 is about 60% larger than the average office building on the Washington, DC roll, which comes to 120,450 sq ft across 1,761 buildings.
Its assessed value works out to $437 per square foot of building area, against $370 across all office floor area on the roll.
The last recorded sale priced it at $437 per square foot.
What has happened at 901 K ST NW # 1 recently?
1 recorded transfer is on file for this parcel, the latest dated Jun 2025.
What does “Office” mean for this parcel?
The Washington, DC roll classifies SSL 03712001 as “Office” (use code 057). 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 901 K ST NW # 1?
The recorded owner on the Washington, DC assessment roll (current) is 901 K STREET OWNER, L.P.. Owner mailing address on file: 235 MONTGOMERY ST # 16FLOOR, SAN FRANCISCO, CA, 94104.
What companies have offices at 901 K ST NW # 1?
2 active business locations at this building appear in Washington, DC public records, including Microsoft Corporation, AIG Employee Services, Inc.. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 901 K ST NW # 1?
The Washington, DC roll records 193,114 sq ft of building area, a build year of 2009. It sits on a 21,667 sq ft lot.
What is the assessed value of 901 K ST NW # 1?
$84,300,000 on the Washington, DC roll. Assessed values are taxable-roll figures, not market prices.
When did 901 K ST NW # 1 last sell?
The last recorded transfer was in Jun 2025 for $84,300,000 ($437 per square foot).
What is the SSL for 901 K ST NW # 1?
SSL 03712001, site address 901 K ST NW # 1, Washington. It is the key to look the parcel up in the Integrated Tax System public extract (Washington, DC).
More around 901 K ST NW # 1
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- Washington, DC — Integrated Tax System public extract (owner names, mailing addresses, assessments), CAMA commercial and daily sales tables, Basic Business Licenses (suite-level premises; the universal catch-all licence was repealed Oct 2025, thinning the roll thereafter), and DOEE energy benchmarking.
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.
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Dataset updated . Source: Washington, DC assessment roll, SSL 03712001.
About this data
Source: Integrated Tax System public extract (Washington, DC), as published September 20, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “901 K ST NW # 1, Washington, DC (SSL 03712001)”, https://buildingcensus.com/offices/dc/office-building-bf75b08e (data as of September 20, 2026).