How do you thank anyone, never mind a real estate Broker?
A simple note of thanks for your time will suffice. To be honest I don't know that a written note is necessary, it was just an interview. If on the other hand you were hired and you are so happy about this, perhaps you can send roses as your way of saying thank you for giving me this job. It doesn't matter if the person who hired you is a man or woman. Men like to receive flowers too. You'd be suprised at what some men think about receiving flowers.