1255 UNION ST NE
Office (large) · Washington · 20002
At a glance
1255 UNION ST NE in Washington, DC is listed on the Washington, DC property roll as “Office (large)”, SSL 35870833. The roll records 237,645 sq ft of building area, a 2021 build year and an assessed value of $77,407,840. It last sold for $20,335,748 in Jan 2018. 15 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. 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 |
|---|---|---|---|---|
| Jan 2018 | $20,335,748 | 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 — 15 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| KIPP D.C. Public Charter Schools | 900 | Sep 2026 | DC business licence | folio match · high |
| The Trendline | — | Sep 2026 | DC business licence | folio match · high |
| Bytedance Inc.via ByteDance Inc. | — | May 2026 | DC business licence | folio match · high |
| TIKTOK, INC. | — | May 2026 | DC business licence | folio match · high |
| OmegaMITS | — | Feb 2026 | DC business licence | folio match · high |
| Reliant Construction Development and Management LLC | — | Feb 2026 | DC business licence | folio match · high |
| PROVEN MANAGEMENT | — | Jan 2026 | DC business licence | folio match · high |
| DATANET SYSTEMS Corporation | — | Jan 2026 | DC business licence | folio match · high |
| AGF Talent | — | Jan 2026 | DC business licence | folio match · high |
| TJS GROUP LLC | — | Dec 2025 | DC business licence | folio match · high |
| Howerton Horticulture | — | Aug 2025 | DC business licence | folio match · high |
| grOH! Playrooms | — | Aug 2025 | DC business licence | folio match · high |
| EL PRESIDENTE | — | Jul 2025 | DC business licence | folio match · high |
| GREEN COMPASS, LLC | — | Jan 2024 | DC business licence | folio match · high |
| LLOYD E. CHESLEY JR. INSURANCE AGENCY, | 7-42 | Feb 2023 | DC business licence | folio match · high |
Washington, DC assessment roll
Parcel record
| Field | Value |
|---|---|
| SSL | 35870833 |
| Site address | 1255 UNION ST NE |
| Land use (DOR) | 052 — Office (large) |
| Building area (actual) | 237,645 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | 27,776 sq ft |
| Year built | 2021 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $77,407,840 |
Recorded owner (assessment roll)
CP MARKET TERMINAL LLC
Owner mailing address: 1615 L ST NW STE 650, 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
- 1255 UNION ST NE
- City
- Washington
- ZIP
- 20002
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 1255 UNION ST NE compare with other Washington office buildings?
At 237,645 sq ft, 1255 UNION ST NE is about twice 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 $326 per square foot of building area, against $370 across all office floor area on the roll.
The last recorded sale priced it at $86 per square foot.
Does the owner of 1255 UNION ST NE hold other Washington office property?
5 Washington office properties (5 parcels, 1.3M sq ft) are recorded to 5 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 1255 UNION ST NE recently?
1 recorded transfer is on file for this parcel, the latest dated Jan 2018.
The building files energy-benchmarking disclosures — 1 report year are matched to this parcel.
What does “Office (large)” mean for this parcel?
The Washington, DC roll classifies SSL 35870833 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 1255 UNION ST NE?
The recorded owner on the Washington, DC assessment roll (current) is CP MARKET TERMINAL LLC. Owner mailing address on file: 1615 L ST NW STE 650, WASHINGTON, DC, 20036.
What companies have offices at 1255 UNION ST NE?
15 active business locations at this building appear in Washington, DC public records, including KIPP D.C. Public Charter Schools, The Trendline, Bytedance Inc., TIKTOK, INC., OmegaMITS. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 1255 UNION ST NE?
The Washington, DC roll records 237,645 sq ft of building area, a build year of 2021. It sits on a 27,776 sq ft lot.
What is the assessed value of 1255 UNION ST NE?
$77,407,840 on the Washington, DC roll. Assessed values are taxable-roll figures, not market prices.
When did 1255 UNION ST NE last sell?
The last recorded transfer was in Jan 2018 for $20,335,748 ($86 per square foot).
What is the SSL for 1255 UNION ST NE?
SSL 35870833, site address 1255 UNION ST NE, Washington. It is the key to look the parcel up in the Integrated Tax System public extract (Washington, DC).
More around 1255 UNION ST NE
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.
Working with Washington 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: Washington, DC assessment roll, SSL 35870833.
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, “1255 UNION ST NE, Washington, DC (SSL 35870833)”, https://buildingcensus.com/offices/dc/office-building-f218e618 (data as of September 20, 2026).