The agreement must have a start and end date. As the seller's agent, the brokerage and listing agent must: follow the seller's lawful instructions, be loyal to the seller, promote the seller's best.Purpose. The purpose of this Agreement is to establish an exclusive agency relationship between Buyer and Agent. Buyer Agents often require Buyers to sign an Agreement to ensure their Brokerage will be paid the entirety of the Buyer Brokerage commission. A buyer's agency agreement creates a business relationship between buyers and agents. Learn how a buyer's agreement works and what both parties can expect. For buyers, the agreement must be signed before touring a home with their REALTOR®. The purpose of this Agreement is to establish an exclusive agency relationship between Buyer and Brokerage. Buyer. A licensee shall enter into a written agency agreement that contains all of the following: (1) An expiration date; (2) A statement that it is illegal. With an exclusive buyer agency agreement, you pledge to work with only one buyer's agent – the one offering you the buyer agency agreement.