N.Y. Comp. Codes R. & Regs. tit. 2, § 24.4
(a) An initial protest to the Bureau of Contracts must be in writing and must contain specifically enumerated factual and/or legal allegations, setting forth the basis on which the protesting party challenges the contract award by the public contracting entity.
(3) In the case of a protest related to a procurement that resulted in contract awards to multiple successful bidders, the interested party must file such protest with the Bureau of Contracts prior to the Comptroller’s final action on any contract award related to that procurement.
(c) Service and delivery.
(2) In the case of a protest related to a procurement that resulted in contract awards to multiple successful bidders, the Bureau of Contracts shall determine whether any of the successful bidders would be affected by the outcome of the protest and, thus, whether any of the successful bidders should be provided with a copy of the protest and an opportunity to respond.
(d) Answers to the protest.
(3) The successful bidder may file an answer to the protest with the Bureau of Contracts no later than the date that the public contracting entity is required to file its answer. If the successful bidder chooses to file an answer, it must simultaneously deliver a copy of such answer to the public contracting entity and the protesting party, and provide evidence of such delivery, either by showing that an electronic copy has been provided, or by attaching to the answer an affirmation in writing as to such delivery.
(e) Protesting party’s reply.
(b) Time to file a protest.