A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers. A OneTime Showing Agreement form is a legally binding agreement between the buyer's broker and the homeowner listing the property for sale.To securely and accurately complete the One Time Showing Agreement and ensure all legal bases are covered, click the button below. Use the Sales Tax Paid in Another State {Sales Tax Form} (PDF) (DTF-804) form to claim credit for the state and local sales taxes you paid in the other state. This form is used for the sale of vacant land. This form is actually three forms in one; offer, purchase and sale agreement and escrow instructions. This is a legally binding contract. If not understood, seek legal advice. POST-CLOSING OCCUPANCY BY SELLER. 76. 7.