GSA seeks expressions of interest for a fully serviced office lease in Denver, Colorado, within an area bounded by Market Street, 20th Street, Champa Street, and 17th Street, for 21,476–22,550 ABOA sq ft. The space must be contiguous, self-contained, on a single floor above the first floor, not in a courthouse or co-located with law enforcement, and not in the 1-percent annual chance floodplain, with loading dock, freight elevator, and attached covered parking (20 total/structured, 2 reserved). Lease terms are a 120-month full term, 60-month firm term, and one 60-month option, with estimated occupancy on 2/28/2029. The offered space must meet government fire safety, accessibility, seismic, and sustainability standards and comply with Section 889 telecommunications prohibitions. Expressions of interest must include building address, contact details, available ABOA/rentable square footage by floor, full-service rental and operating costs, and rates inclusive of a $56.59/ABOA tenant improvement allowance and a $12.00/ABOA BSAC allowance, with owner consent if submitted by a representative.