It depends on where you are with the purchase offer. When the offer is first made, it is basically a request to buy a piece of property. An offer then becomes a valid, legal, and binding contract once it is signed by both parties, consideration(a deposit) is paid, and it is delivered back to the party that made the offer. It starts its journey as a request to buy, and if followed through, becomes a full fledged and binding contract. Good luck to you!