The Administrator may lease space on a major pedestrian access level, courtyard, or rooftop of a public building to a person, firm, or organization engaged in commercial, cultural, educational, or recreational activity (as defined in
section 3306(a) of this title). The Administrator shall establish a rental rate for leased space equivalent to the prevailing commercial rate for comparable space devoted to a similar purpose in the vicinity of the public building. The lease may be negotiated without competitive bids, but shall contain terms and conditions and be negotiated pursuant to procedures that the Administrator considers necessary to promote competition and to protect the public interest.