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.Due Diligence in real estate is the process of conducting a comprehensive research or investigation prior to engaging in a property transaction. 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. When purchasing commercial real estate, you should include a due diligence period as a crucial element in your negotiations and in the contract. I cannot stress the importance of due diligence when picking a realtor to list your home. What do real estate lawyers actually do during due diligence for a deal? What does a NYC real estate due diligence report sample look like?