# SAM #5DC0643

Sole-source extension of CSOSA’s Washington, DC office lease LDC12624

**Buyer:** GSA PBS Office of Leasing
**Posted:** November 13, 2026
**Identifier:** 5DC0643
**NAICS:** 531120

GSA seeks a sole-source extension of CSOSA’s office lease at 800 North Capitol Street NW in Washington, DC.
- **Requirement:** Extend lease LDC12624 to maintain occupancy of 73,421 rentable square feet (RSF), providing 62,987 building-owner-acceptable square feet (BOASF).
- **Purpose:** Continue operations while replacement federally controlled space is delayed; the project schedule anticipates substantial completion in September 2027.
- **Value:** The stated total contract value is $6,277,495.50.
- **Period detail:** The attachment calls this an 18-month extension, but gives dates of October 1, 2026 through March 31, 2027, which is six months. It also states that the current lease expires September 30, 2026; the duration and dates therefore appear inconsistent and should be verified against the justification.

### Description

<p>See attached redacted justification</p>

[View original listing](https://sam.gov/opp/57242b96a9c54bcf8751611ce36ebc18/view)