Form SSP is generally considered the most buyerfriendly of the forms. Some of the most common include: Mortgage contingency – This clause outlines the period of time in which the buyer must find financing to purchase a property.Each property transaction begins with a legally binding document known as "the contract. An acceleration clause in a mortgage or trust deed stipulates that the entire debt is due immediately, if the borrower defaults under the terms of the contract. Standard Forms for Pennsylvania Realtors®. In Pennsylvania, a buyer can back out of a real estate contract if certain contingencies are not met or if the contract includes a specific termination clause. A power of sale clause written into a mortgage contract authorizes the mortgagee to sell the property in the event of default. Everything you need to know to represent your seller! These four primary clauses are an acceleration clause, a dueonsale clause, a prepayment penalty clause and a release clause. It details what is needed to sell and buy a property in the entire state of Pennsylvania.