first, an offer is “a manifestation of the willingness to enter into a transaction that is made in such a way that another person understands that his or her consent to that transaction will be invited and will close it.” id. there are many types of contingencies that can be included in real estate contracts on the buyer and seller side, and it is important to understand all the contingencies included in your purchase agreement as the hot market continues, it is important that everyone knows and understands the importance of disclosing parallel agreements. “collateral agreements are not parallel agreements – they are often the main event in commercial transactions, but [for too long] courts and commentators have paid no attention to these side agreements.” when analyzing the existence of a contract, a lawyer will review each offer, acceptance, counterpayment, addendum and consideration to determine whether the parties have reached an agreement. the georgia residential purchase and sale agreement covers everything necessary for a contract to be considered complete and enforceable.