A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. A master service agreement (MSA) is a fundamental contract outlining the scope of the relationship between two parties.First Hurdle, Form of a Contract - Statute of Frauds. In Michigan, an agreement for the sale of real property must be in writing in order to be enforceable. Earnest money deposits (often confused with down payments) plays an important role in the sale, with processes and amounts varying from state to state. Check out all the forms you need in Michigan here! FAQs. Is Filling out a Michigan Real Estate Purchase Agreement Difficult? I represent buyers who terminated a purchase contract after discovering black mold in the house.