Engaging Apartment Brokers - Key Questions?

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I've been doing a lot of reading and research on how to engage brokers that deal in small to medium apartment buildings. Up until this point, I haven't actually reached out to any though. I'm interested in an 18 unit apartment building and would like suggestions on key questions to ask when contacting the listing broker. I know I need to ask for the T12, offering memorandum, and rent roll but what are some other questions to ask? Additionally, what questions should be in the initial correspondence versus later in the conversation? Any suggestions or tips would be appreciated!