You have to use Conditional Deed of Sale wherein certain clauses should be added to the normal DOAS. Keep the bank guarantee and stipulate that the downpayment.An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal. Create yours now with our free form. Focus on three things: State your intentions, show that you have the financial means to make the purchase and make a personal appeal to the seller. Present Clear Benefits: Explain how the loan will benefit the borrower. Learn the steps in a real estate transaction and what happens with sale of property. Find a real estate lawyer. The purchase offer is your opportunity to convince the seller that they should sell their home to you rather than another buyer. I just found your blog.