1850 I ST NW
Office (large) · Washington · 20433
At a glance
1850 I ST NW in Washington, DC is listed on the Washington, DC property roll as “Office (large)”, SSL 01050055. The roll records 368,790 sq ft of building area, a 1978 build year and an assessed value of $149,789,810. 1 active business locations at this address appear in public records.
The building's own benchmarking filing
Energy performance
From the building's own filing under its city's benchmarking ordinance, latest of 2 years on record. 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.
Public record — 1 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| WORLD BANK I | — | Dec 2024 | DC business licence | folio match · high |
Washington, DC assessment roll
Parcel record
| Field | Value |
|---|---|
| SSL | 01050055 |
| Site address | 1850 I ST NW |
| Land use (DOR) | 052 — Office (large) |
| Building area (actual) | 368,790 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | 43,919 sq ft |
| Year built | 1978 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $149,789,810 |
Recorded owner (assessment roll)
INTERNATIONAL BANK FOR RECONSTRUCTION & DEVELOPMENT
Owner mailing address: 1818 H ST NW, WASHINGTON, DC, 20433
4 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
- 1850 I ST NW
- City
- Washington
- ZIP
- 20433
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 1850 I ST NW compare with other Washington office buildings?
At 368,790 sq ft, 1850 I ST NW is about 3 times 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 $406 per square foot of building area, against $370 across all office floor area on the roll.
Does the owner of 1850 I ST NW hold other Washington office property?
4 Washington office properties (4 parcels, 1.6M sq ft) are recorded to 3 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 1850 I ST NW recently?
The building files energy-benchmarking disclosures — 2 report years are matched to this parcel.
What does “Office (large)” mean for this parcel?
The Washington, DC roll classifies SSL 01050055 as “Office (large)” (use code 052). 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 1850 I ST NW?
The recorded owner on the Washington, DC assessment roll (current) is INTERNATIONAL BANK FOR RECONSTRUCTION & DEVELOPMENT. Owner mailing address on file: 1818 H ST NW, WASHINGTON, DC, 20433.
What companies have offices at 1850 I ST NW?
1 active business locations at this building appear in Washington, DC public records, including WORLD BANK I. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 1850 I ST NW?
The Washington, DC roll records 368,790 sq ft of building area, a build year of 1978. It sits on a 43,919 sq ft lot.
What is the assessed value of 1850 I ST NW?
$149,789,810 on the Washington, DC roll. Assessed values are taxable-roll figures, not market prices.
What is the SSL for 1850 I ST NW?
SSL 01050055, site address 1850 I ST NW, Washington. It is the key to look the parcel up in the Integrated Tax System public extract (Washington, DC).
More around 1850 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 01050055.
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, “1850 I ST NW, Washington, DC (SSL 01050055)”, https://buildingcensus.com/offices/dc/office-building-99c4bef0 (data as of September 20, 2026).