Contracting officers must include sustainable design requirements appropriate for the type of leasing action in the solicitations for offers. Contracting officers can find solicitation requirements and instructions on http://www.gsa.gov/leasing under Leasing Policies and Procedures, Green Leasing, and in the Leasing Desk Guide to assist them in complying with GSA's sustainable requirements identified in this part.
48 C.F.R. §570.117