The seller would like you to introduce the request for a concession with the initial offer. From a buyers prospective a seller's concession could be inroduced during the negotiation phase. In the Hempstead NY area the buying procedure usually does not go to contract until after the home inspection. The accepted offer is considered as a binder, the home inspection follows, then a contract of sale is presented to the buyer's attorney. Negotiations can still be continuing regarding the defects found during the inspection and remedies could be included in the contract.