A Pennsylvania purchase agreement creates a secured contract for a residential property transaction. Sell your home without a realtor using our ultimate For Sale By Owner checklist.A complete FSBO guide with the best expert tips! A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction. Have the offer and contract forms available for potential buyers. One property I sold FSBO the buyers signed a contract on the spot. I am trying to use google sheets and google forms as in inventory tracker to have a main page where the items location is. I've been tracking income and expenses on a very simple Google sheet which separates things into the different properties.