These four primary clauses are an acceleration clause, a dueonsale clause, a prepayment penalty clause and a release clause. Below, we'll look at the most common home sale contingencies in Florida, including inspection, title, and sale of buyer property.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. An escalation clause, or escalation addendum, is a real estate document that outlines a buyer's willingness to raise their initial purchase price offer. We're going to be reviewing and going over the as is residential contract some of the best practices builds and clauses in here. Our real estate attorneys at LAW OFFICE OF GARY M. LANDAU can assist you with contract drafting and negotiations. The assignability clause in the contract addresses the buyer's ability to transfer their rights and obligations to another party. Real estate transactions are loaded with issues that require carefully worded clauses and conditions to keep the deal on track. Skills Training for the Real Estate Professional. Abney, Disclaiming the Implied.