What kind of contract describes the property, states the amount of commission to be paid, states an expiration date, and is signed by the seller?

An offer to purchase is a document submitted by a potential buyer to a seller, indicating their intention to buy a property at a specified price. While it may mention terms like price and conditions, it is not signed by the seller as a means of representation and does not establish commission or an expiration date.

A contract to sell is a legal agreement between a buyer and a seller once the terms of sale have been agreed upon. While it outlines the transaction details, including price and conditions, it does not typically cover the commission structure or the seller's agreement to list the property, which are key components of a listing contract.

An option agreement grants a buyer the right to purchase a property within a certain timeframe at a predetermined price, but it does not involve a commission structure or explicitly require a seller's signature for marketing purposes. Its focus is more on the buyer's rights rather than the seller's obligations in marketing the property.