Duties to Clients and Customer : When representing a buyer, seller. landlord, tenant, or other client as an agent, Realtors PLEDGE themselves to protect and promote the interests of their client. This obligation to the client is primary, but it does not relieve Realtors of their obligation to treat all parties honestly. When serving a buyer, seller, landlord, tenant or other party in a non-agency capacity, Realtors remain obligated to treat all parties Honestly .