It comes as the final step before the signing of the contract of sale and typically lasts 57 business days. We have put together a real estate due diligence checklist.Thus, we have gathered some go-to resources that we often use ourselves. Due Diligence in real estate is the process of conducting a comprehensive research or investigation prior to engaging in a property transaction. Each property is different and there is no "one size fits all" due diligence checklist. Listed below are some common items that apply to most residential deals. When purchasing commercial real estate, you should include a due diligence period as a crucial element in your negotiations and in the contract. We will describe the full extent of the real estate due diligence checklist. What is due diligence in real estate? This page contains Due Diligence clauses in business contracts and legal agreements.