From there, I would weed those down with interview questions.

Whatever office you interview with, make sure you ask about available training, floor time, fees, coaching, leads, mentoring and other grow opportunities within the company.

I post a list of 7 questions in other places for people to use when interviewing banks. 

She's interviewed several but is not comfortable with the terms of their contracts and they seem resistant to modifying/red-lining their terms (note: my wife is a contract attorney, so part of the question here is "are we being too stringent?").  

If you performed your due diligence and interviewed 3 companies, don’t give up yet. 

@Charles Mitchell, happy to interview to be your local Broker. 

Is like and interview for a job, first appearance, good interest in their valued time, etc, small things is what makes the difference on these deals sometimes.  

Regardless of how you find them, try to interview at least three managers1.

If you're going to invest out of state, interview multiple property managers and get referrals from their clients.

Be sure to interview them and ask them for references!