An Ohio residential purchase agreement is a contract between the buyer and the seller of a residential property. Point out the homes character, specifically if the sellers have their own projects; Explain your willingness to close; Explain your bid.An Ohio purchase agreement establishes the terms and conditions of a real estate transaction. This letter offers a general description of the proposed transaction, including the desired financial terms and completion dates. NAR offers a number of other forms to members and association staff which are not transaction-related: Real Estate Business Letter Templates.