N.Y.C. Charter § 323: Section 323. Multi-step sealed proposals.

A preliminary request for proposals may be issued requesting the submission of unpriced offers. Submissions in response to such a preliminary request for proposals may be relied upon by an agency (a) to solicit competitive sealed bids in accordance with section three hundred thirteen of this chapter; (b) to solicit competitive sealed bids from prequalified vendors in accordance with section three hundred eighteen; (c) to solicit competitive sealed proposals in accordance with section three hundred nineteen; or (d) to solicit proposals from prequalified vendors in accordance with section three hundred twenty.