These four primary clauses are an acceleration clause, a dueonsale clause, a prepayment penalty clause and a release clause. What are the essential elements of a Real Estate Contract?Some important contingency clauses should include financing, home inspections, closing costs, and the closing date, among others. 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. Essential clauses in home purchase agreements protect buyers and sellers. The first clause binds the buyer to the contract no matter what. The second clause gives the buyer an out if he or she finds another property. Seven-point checklist for items that investors should include in their purchase contract when they are buying real estate investment 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. Key Components: Purchase price, property description, contingencies, and closing date.