Purchase Agreement - Standard Form. Click here to download a Standard Purchase Agreement.The purchase agreement attached here is a standard purchase agreement between the buyer and seller, for properties located in Ohio. This Purchase and Sale Agreement ("Agreement") is made and entered into between DMark. This document will provide a guide to the rules and regulations for the preparation and approval of survey plats and legal descriptions. THIS PURCHASE AND SALE AGREEMENT (the "Agreement") is made as of the Effective. Fill in the blank Land Contract form formatted to comply with all Ohio recording and content requirements. Apply for and inform the city of what you require.