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 buyer to indicate their intention to buy a property, specifying terms such as price and conditions. However, it does not include commission details or an expiration date, nor is it signed by the seller until accepted, making it unsuitable for this description.

A contract to sell is a legal agreement that outlines the terms of a sale once an offer has been accepted. While it may address property details and conditions of sale, it does not typically include commission specifics or expiration dates, which are specific to listing agreements.

An option agreement gives a potential buyer the right to purchase a property at a specified price within a certain timeframe. This type of agreement does not typically involve commission details or require the seller's signature in the same manner as a listing contract, focusing instead on the buyer's right to purchase.