This page contains Due Diligence clauses in business contracts and legal agreements. We have organized these clauses into groups of similarly worded clauses.Learn due diligence in real estate, different types of due diligence, buyer rights, due diligence time period and essential action items. What should be on my due diligence checklist for real estate purchases? Due diligence is a critical process in real estate that involves researching and verifying information about a property before making a purchase. Customer: I entered into a purchase agreement on March 25th to purchase a property with due diligence period ending May 3rd. Settlement to be on May 15th. When purchasing commercial real estate, you should include a due diligence period as a crucial element in your negotiations and in the contract. Due diligence relates to an investigation or review of all facts and details about a matter. The term applies more commonly within the business context.