You may be talking about paying a commission on the sale of your condo. In which case the commission rate is determined by the realtor and their broker.
Your buyer who Is also an agent should know how to handle the transaction for himself. However, you are not being represented. You will need to hire an attorney or realtor for your interests to be represented.
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In your case the realtor on the other side of your deal is protecting his interests, not yours. Has anyone else told you the value of your property? Has anyone told you if the condo is in a buyer or sellers market area and how that affects its value? Has anyone advised you what your legal protections are? What inspections you are required to do? What protections your tenants have in the transaction? Do you know that you have to give the buyer the renter's security deposits for the condo as part of the deal? Who is protecting YOU and making sure you get a fair deal?? That's what you are hiring a realtor for - not just for "doing paperwork".
You really need a real estate professional that review the documents and advice you properly. Now, is a personal decision, but, you need to hire a real estate attorney or a real estate agent.
Best of Luck,
J C Realtors Group