609 I ST NW
Office · Washington · 20001
At a glance
609 I ST NW in Washington, DC is listed on the Washington, DC property roll as “Office”, SSL 04527000. The roll records 1,042 sq ft of building area, a 1890 build year and an assessed value of $144,910. It last sold for $638,124 in Jul 2017 on a deed covering 2 parcels.
Recorded transfers — county roll + state sale file
Sale history
The most recent transfer covered 2 parcels. The price shown is the whole transaction, not this parcel alone, so any per-square-foot figure is measured across everything the deed conveyed. The county record carries no multi-parcel flag for it; the parcels were identified by their identical price, date and ZIP.
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Jul 2017 | $638,124 | 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 — 0 matched business locations
Tenants & business locations
No active business locations at this address appear in the public records ingested so far. That is a statement about the records, not the building: tenants without a county business-tax receipt or a Florida registration at this address are invisible to public data.
Washington, DC assessment roll
Parcel record
| Field | Value |
|---|---|
| SSL | 04527000 |
| Site address | 609 I ST NW |
| Land use (DOR) | 051 — Office |
| Building area (actual) | 1,042 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | — |
| Year built | 1890 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $144,910 |
Recorded owner (assessment roll)
SQUARE 452 TOWNHOUSE LLC
GOULD PROPERTY COMPANY
Owner mailing address: 1725 DESALES ST NW STE 900, WASHINGTON, DC, 20036
5 Washington office properties share this owner mailing address →
Commercial property is usually held one building per entity; a shared mailbox is how the roll reveals a portfolio. It is evidence of common ownership, not proof.
Location
- Address
- 609 I ST NW
- City
- Washington
- ZIP
- 20001
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 609 I ST NW compare with other Washington office buildings?
At 1,042 sq ft, 609 I ST NW is less than a tenth the size of 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 $139 per square foot of building area, against $370 across all office floor area on the roll.
The last recorded sale priced it at $153 per square foot across the parcels conveyed.
Does the owner of 609 I ST NW hold other Washington office property?
5 Washington office properties (5 parcels, 388.3K sq ft) are recorded to 4 owner entities sharing this parcel's tax-bill mailing address. A shared mailing address is evidence of common ownership, not proof of it.
What has happened at 609 I ST NW recently?
1 recorded transfer is on file for this parcel, the latest dated Jul 2017.
What does “Office” mean for this parcel?
The Washington, DC roll classifies SSL 04527000 as “Office” (use code 051). 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 609 I ST NW?
The recorded owner on the Washington, DC assessment roll (current) is SQUARE 452 TOWNHOUSE LLC, GOULD PROPERTY COMPANY. Owner mailing address on file: 1725 DESALES ST NW STE 900, WASHINGTON, DC, 20036.
What companies have offices at 609 I ST NW?
No business locations at this building appear in the public records ingested so far — no licence, tax or registry record currently lists this address; that is a gap in the record, not proof the building is empty.
How big is 609 I ST NW?
The Washington, DC roll records 1,042 sq ft of building area, a build year of 1890.
What is the assessed value of 609 I ST NW?
$144,910 on the Washington, DC roll. Assessed values are taxable-roll figures, not market prices.
When did 609 I ST NW last sell?
The last recorded transfer was in Jul 2017 for $638,124, on one deed conveying 2 parcels ($153 per square foot).
What is the SSL for 609 I ST NW?
SSL 04527000, site address 609 I ST NW, Washington. It is the key to look the parcel up in the Integrated Tax System public extract (Washington, DC).
More around 609 I ST NW
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 04527000.
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, “609 I ST NW, Washington, DC (SSL 04527000)”, https://buildingcensus.com/offices/dc/office-building-1abcb925 (data as of September 20, 2026).