The Department of the Interior seeks construction work at the Stewart Lee Udall Building, 1849 C Street NW, Washington, DC 20240, under a combined synopsis/solicitation for a firm-fixed-price award. This is a total small-business set-aside under NAICS 238910 (Site Preparation Contractors) with a $19 million size standard. Award will be made on a lowest-price technically acceptable basis to a responsible vendor whose quote conforms to the solicitation, with the government intending to evaluate and award without discussions but reserving the right to hold discussions if necessary. Interested vendors may attend site visits on Friday, November 6, 2026, at 11:00 AM and Monday, November 9, 2026, at 2:00 PM at the C Street entrance, and must email attendee details; visitors must have a valid REAL ID. Written questions are due by 12:00 PM EST on November 10, 2026.