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. There are many different types of contract clauses. Timing.Seller shall sell and convey and Purchaser shall purchase the property, together with all buildings and improvements thereon (collectively the. This booklet explains many of these laws you need to know and provides resources where you can find more information about landlord and tenant issues. Each of our deeds is attorneydesigned to meet the requirements of New York law. Click the link below to create a deed online to transfer New York real estate. Simply defined, it is a legal term that serves to remind all parties involved in a contract that time is running out. These four primary clauses are an acceleration clause, a dueonsale clause, a prepayment penalty clause and a release clause.