A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. The Seller agrees to sell, and the Institution agrees to buy, the Collection for a total purchase price of ______ ("Purchase Price").The Institution shall. Section 17 of this Agreement and the warranty of title contained in the Deed). A land sales agreement is a legal contract between a seller and a buyer that is used to purchase real estate and outline the terms of the transaction. Download a template purchase and sale agreement for multifamily (i.e. Apartment) properties.