PHASE I 456 ASSOCIATES
33 office properties in Washington, DC recorded to 3 owner entities mailing to 601 E ST NW, WASHINGTON, DC. likely one owner
At a glance
PHASE I 456 ASSOCIATES is recorded as the owner of 33 office properties (33 parcels) in Washington, DC, totalling 443.1K sq ft of building area with $275.9M of assessed value. The holdings sit in 3 owner entities that share one tax-bill mailing address in WASHINGTON, DC — 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 |
|---|---|---|---|---|---|
| 601 E ST NW # A300 | Washington | 24.1K | $11.4M | — | 0 |
| 601 E ST NW # A400 | Washington | 23.5K | $12.9M | — | 0 |
| 601 E ST NW # B200 | Washington | 23.1K | $10.9M | — | 0 |
| 601 E ST NW # A600 | Washington | 22K | $13.4M | — | 0 |
| 601 E ST NW # A800 | Washington | 22K | $14.9M | — | 0 |
| 601 E ST NW # A500 | Washington | 22K | $12.5M | — | 0 |
| 601 E ST NW # A700 | Washington | 22K | $14.2M | — | 0 |
| 601 E ST NW # A200 | Washington | 21.9K | $10.9M | — | 0 |
| 601 E ST NW # B600 | Washington | 21.8K | $13.1M | — | 0 |
| 601 E ST NW # B500 | Washington | 21.8K | $12.5M | — | 0 |
| 601 E ST NW # B700 | Washington | 21.8K | $13.8M | — | 0 |
| 601 E ST NW # B800 | Washington | 21.8K | $14.5M | — | 0 |
| 601 E ST NW # B900 | Washington | 21.4K | $17.8M | — | 0 |
| 601 E ST NW # 1000 | Washington | 21.4K | $17M | — | 0 |
| 601 E ST NW # 1000 | Washington | 21K | $17M | — | 5 |
| 601 E ST NW # A900 | Washington | 21K | $15.8M | — | 0 |
| 601 E ST NW # B300 | Washington | 19.8K | $8.5M | — | 0 |
| 601 E ST NW # B400 | Washington | 17.1K | $12.9M | — | 0 |
| 601 E ST NW # C11 | Washington | 12.3K | $1.1M | — | 0 |
| 601 E ST NW # B100 | Washington | 12.3K | $5.7M | — | 0 |
| 601 E ST NW # B301 | Washington | 5.6K | $3M | — | 0 |
| 601 E ST NW # A102 | Washington | 5.5K | $2M | — | 0 |
| 601 E ST NW # A100 | Washington | 4.7K | $1.4M | — | 0 |
| 601 E ST NW # A101 | Washington | 3.6K | $1M | — | 0 |
| 601 E ST NW # BC11 | Washington | 3.4K | $1.4M | — | 0 |
| 601 E ST NW # B101 | Washington | 2.2K | $1M | — | 0 |
| 601 E ST NW # B102 | Washington | 1.9K | $808.4K | — | 0 |
| 601 E ST NW # A103 | Washington | 1.8K | $808.4K | — | 0 |
| 601 E ST NW # A104 | Washington | 225 | $200K | — | 0 |
| 601 E ST NW # C40 | Washington | — | $4.3M | — | 0 |
| 601 E ST NW # C30 | Washington | — | $4.3M | — | 0 |
| 601 E ST NW # C10 | Washington | — | $2.2M | — | 0 |
| 601 E ST NW # C20 | Washington | — | $2.7M | — | 0 |
Names on the deeds
Owner entities at this address
- PHASE I 456 ASSOCIATES
- AARP FOUNDATION
- AARP PROPERTIES 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 PHASE I 456 ASSOCIATES's office buildings?
All 33 properties are in Washington.
The largest is 601 E ST NW # A300 in Washington at 24.1K sq ft.
The one recorded build year is 1991.
How large is this portfolio within Washington's office market?
Its 443.1K sq ft is 0.21% of the 212.1M sq ft of office building area on the Washington, DC roll.
Its $275.9M of assessed value is 0.35% of the metro's office total.
It holds 33 of the metro's 1,761 office buildings.
Frequently asked questions
How many office buildings does PHASE I 456 ASSOCIATES own in Washington?
33 office properties (33 parcels) on the Washington, DC roll, counted by building rather than by condo parcel.
What is PHASE I 456 ASSOCIATES's largest office building?
601 E ST NW # A300, Washington — 24.1K sq ft, assessed at $11.4M.
What are PHASE I 456 ASSOCIATES's office properties worth?
Their combined assessed value on the current Washington, DC roll is $275,874,190. 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. 3 owner entities share the mailing address. It is evidence of common ownership, not proof of it.
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, “PHASE I 456 ASSOCIATES — Washington office property holdings”, https://buildingcensus.com/offices/dc/owners/phase-i-456-associates-44356d (data as of September 20, 2026).