(a) Where a consultant is to be retained, the city shall select the consultant to be employed providing such consultant is acceptable to the commissioner. Such consultant shall demonstrate a particular competency to engage in the preparation of local laws.

(b) Where there is professional licensing under New York State law, such consultant shall be qualified in his particular profession within the State of New York.

(c) If the consultant is not an attorney qualified to practice law in the State of New York, the proposed local law shall be accompanied by a statement from an attorney qualified to practice law in the State of New York to the effect that in his opinion the proposed local law conforms to the laws of the State of New York.