See Illinois REALTORS® sample form Exclusive Buyer Brokerage Agreement. (a) To provide Designated Agent with Buyer's general specifications for the real estate Buyer is seeking. 67.When you sign this Agreement, you grant that agent the exclusive right to market, list, and sell your home for a specified period, usually 2-6 months. Edit, sign, and share chicago area realtor listing agreements online. No need to install software, just go to DocHub, and sign up instantly and for free. UPDATED Residential Exclusive Agency Marketing Agreement.pdf.