A buyer makes an offer on property and the seller accepts the buyer's offer. The buyer does not offer an earnest money payment in the offer. The contract is:

A void contract is one that has no legal effect from the beginning, usually due to a lack of essential elements such as capacity or legality. In this case, since there are valid components such as an offer and acceptance, the contract remains enforceable and is not void.

A unilateral contract is one in which only one party makes a promise or takes action contingent upon the other party's performance. In this scenario, both the buyer and seller have made mutual agreements (offer and acceptance), indicating that this is a bilateral contract rather than unilateral.

An unenforceable contract is one that cannot be enforced due to certain legal defenses, such as the lack of a written agreement in specific situations or the statute of limitations. However, in this instance, the contract is valid and binding, despite the absence of earnest money, and therefore it is not unenforceable.