T C 800 17TH STREET NW OWNER LLC
2 office properties in Washington, DC recorded to 2 owner entities mailing to 730 3RD AVE, NEW YORK, NY. likely one owner
At a glance
T C 800 17TH STREET NW OWNER LLC is recorded as the owner of 2 office properties (2 parcels) in Washington, DC, totalling 983K sq ft of building area with $412.8M of assessed value. The holdings sit in 2 owner entities that share one tax-bill mailing address in NEW YORK, NY — and a name root, which is how a single sponsor usually holds property.
County assessment roll
Properties
| Building | Submarket | Sq ft | Assessed | Last sold | Tenants |
|---|---|---|---|---|---|
| 25 MASSACHUSETTS AVE NW | Washington | 551.4K | $143.1M | $307,000,000 · Mar 2015 | 7 |
| 800 17TH ST NW | Washington | 431.6K | $269.7M | — | 4 |
Names on the deeds
Owner entities at this address
- T-C REPUBLIC SQUARE OWNER LLC
- T C 800 17TH STREET NW OWNER LLC
How this group was built. These entities share both a mailing address and a name root, which is how a single sponsor usually holds property — one entity per building.The county records an owner and a mailing address for every parcel; this page collects the office parcels whose owners mail to the same address, and counts buildings rather than parcels using the county's own condo-to-building link. Lease terms, rents and the identity of a manager acting for the owner are not public records and are not shown.
Where are T C 800 17TH STREET NW OWNER LLC's office buildings?
All 2 properties are in Washington.
The largest is 25 MASSACHUSETTS AVE NW in Washington at 551.4K sq ft.
Recorded build years run from 2006 to 2010.
How large is this portfolio within Washington's office market?
Its 983K sq ft is 0.46% of the 212.1M sq ft of office building area on the Washington, DC roll.
Its $412.8M of assessed value is 0.53% of the metro's office total.
It holds 2 of the metro's 1,761 office buildings.
1 of its parcels carry a recorded sale price; the most recent was 25 MASSACHUSETTS AVE NW in Mar 2015 for $307,000,000.
Frequently asked questions
How many office buildings does T C 800 17TH STREET NW OWNER LLC own in Washington?
2 office properties (2 parcels) on the Washington, DC roll, counted by building rather than by condo parcel.
What is T C 800 17TH STREET NW OWNER LLC's largest office building?
25 MASSACHUSETTS AVE NW, Washington — 551.4K sq ft, assessed at $143.1M.
What are T C 800 17TH STREET NW OWNER LLC's office properties worth?
Their combined assessed value on the current Washington, DC roll is $412,800,590. Assessed values are taxable-roll figures, not market prices.
Are these properties owned by one company?
These entities share both a mailing address and a name root, which is how a single sponsor usually holds property — one entity per building. 2 owner entities share the mailing address. It is evidence of common ownership, not proof of it.
When did one of T C 800 17TH STREET NW OWNER LLC's Washington office properties last change hands?
The most recent recorded transfer among these parcels is 25 MASSACHUSETTS AVE NW, Mar 2015, for $307,000,000.
Related
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.
Dataset updated . Derived from public data sources.
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, “T C 800 17TH STREET NW OWNER LLC — Washington office property holdings”, https://buildingcensus.com/offices/dc/owners/t-c-800-17th-street-nw-owner-llc-313810 (data as of September 20, 2026).