N.Y.C. Charter § 310: Section 310. Scope.

Except as otherwise provided in this charter or by statute,

1. all goods, services or construction to be paid for out of the city treasury or out of moneys under the control of or assessed or collected by the city shall be procured as prescribed in this chapter; provided, however, that for (i) the office of an independently elected city official, or (ii) the council, where the provisions of this chapter require action by the mayor or an appointee of the mayor in regard to a particular procurement except for mayoral action pursuant to subdivision c of section three hundred thirty-four, such action shall not be taken by the mayor or such appointee of the mayor, but shall be taken respectively, by (i) by such elected official or (ii) the speaker of the council, or another member of the council designated by the speaker with the approval of a majority of the members of the council, and

2. all goods, services or construction to be procured by an entity, the majority of the members of whose board are city officials or are individuals appointed directly or indirectly by city officials shall be procured as prescribed in this chapter; provided, however, that where the provisions of this chapter require action by the mayor or an appointee of the mayor in regard to a particular procurement except for mayoral action pursuant to subdivision c of section three hundred thirty-four, such action shall not be taken by the mayor or such appointee of the mayor, but shall be taken by the governing board of such entity or by the chair of the board or chief executive officer of such entity pursuant to a resolution adopted by such board delegating such authority to such officer.