View the forms library. A For Sale By Owner contract Pennsylvania must include: 1.The Purchase Price, 2. Pennsylvania requires those selling FSBO to fill out and file many documents and forms. You'll need to complete a seller's disclosure form, which includes details about the property history and any past damage. This FSBO paperwork is needed as soon as you accept an offer, so it's useful to have a purchase agreement onhand that you can fill out quickly. The answer is because the agent did not fill out their buyer agency form correctly (or at all). The FSBO Agreement of Sale is the most necessary and important document of the real estate transaction. We help FSBO's with this 610-489-6983. Selling FSBO requires essential documents, from the original sales contract to the deed.