Choosing a Realtor- what you wish you knew now!

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My fiance and I are in the early stages of creating our plan for our strategy regarding REI. We are interested in purchasing multifamily buy and hold properties near us. I am curious if anybody has any tips or suggestions as to what to look for in a realtor- is there anything you know now about your realtor that would make you decide to work with them again or not? Any specific questions to ask in regards to selecting a realtor for REI? Any red flags to look for?