Step-by-Step Tutorial: Navigating Form 21 Residential Purchase and Sale Agreement. 168 views 11 months agoTo securely and accurately complete the One Time Showing Agreement and ensure all legal bases are covered, click the button below. Welcome to our comprehensive guide on the Form 47 Seller Representation Agreement (Sale to Identified Buyer). A sale on real estate contract shall be on Form. Welcome to our comprehensive guide on the Form 47 Seller Representation Agreement (Sale to Identified Buyer). NOTE: The date of mutual acceptance is important because it triggers many of the time lines in the Purchase and Sale Agreement. Real estate forms and contracts for Washington, DC and Montgomery County, MD. Sales contracts, buyer's agreement, rental forms, leasing agreements. Improved residential real property—Seller's duty—Format of disclosure statement—Minimum information.