The reason that you may not have gotten answers here is simple. Loopnet is the place that you can do the work for your client. It seems that you need to get more training from your company on how to study comps on the MLS. This is your client. And your broker would be the one to ask if you don't know how to do the research. Otherwise you are asking the commercial world out there...to do your job.
I hope you have a company that will help you know how to do this. I like RE/MAX because the agents have a lot of experience and there is always someone you can ask as you get stumped somewhere.
Sep 14, 2016