Block by Block
ActiveGeneral Business · Washington, DC, DC
At a glance
Public records place Block by Block at 2 active locations in 2 Washington office buildings. Locations include 1000 POTOMAC ST NW # CU5 (122); 1020 19TH ST NW (LL55).
Public record — Washington, DC
Office locations (2 active)
| Building | Suite / floor | Submarket | Since | Source | Match |
|---|---|---|---|---|---|
| 1000 POTOMAC ST NW # CU5 | 122 | Washington | Aug 2025 | DC business licence | folio match · high |
| 1020 19TH ST NW | LL55 | Washington | Nov 2024 | DC business licence | folio match · high |
Where does Block by Block operate in Washington?
The earliest active record dates from Nov 2024 and the most recent from Aug 2025.
Across Washington, 5,289 active business locations are matched to office buildings; Block by Block accounts for 2 of them.
How does BuildingCensus know Block by Block is at these addresses?
Each location is a business record whose premises address was matched to a county office parcel (record types on this page: DC business licence). The match method and confidence are shown on every row.
A record at an address is evidence that the business operates there, not a lease: records lag moves by months, and businesses without a local record at an address do not appear.
Frequently asked questions
Where are Block by Block's offices in Washington?
Public records place Block by Block at 2 active locations in Washington, DC: 1000 POTOMAC ST NW # CU5 (122); 1020 19TH ST NW (LL55).
How long has Block by Block been at its Washington locations?
The earliest active record starts Nov 2024; the newest Aug 2025. Start dates are when the record was opened, which can trail the actual move-in.
Related
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commercial and daily sales tables, Basic Business Licenses (suite-level premises; the universal catch-all licence was repealed Oct 2025, thinning the roll thereafter), and DOEE energy benchmarking.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.
Dataset updated . Locations from Washington, DC business records matched to county office parcels.
About this data
Source: Integrated Tax System public extract (Washington, DC), as published October 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Block by Block — Washington office locations”, https://buildingcensus.com/offices/dc/companies/block-by-block (data as of October 9, 2026).