Learn more about real estate due diligence in California on the Steinberg Law website. Contact us today to schedule a consultation!When purchasing land, yes, you do have to do your independent due diligence. Further, there is no "one-stop shopping" for all the information you need. In a CAR Residential Purchase Agreement, the default contingency period for due diligence is typically 17 days from the date of acceptance of the offer. S in your interest as a prospective buyer to have the purchase agreement, disclosure statements, and escrow instructions carefully reviewed. This is a multi offer situation. My agent says I need to put up a strong due diligence offer to show I have the funds to complete the sale. Blue Systems International Private Investigations Firm specializes in due diligence background checks. BSI can be a valuable resource for you.