Your realtor can give you all the actual sales comps to help you see the difference between the listing price and the actual sales price.I however do have a little contrarian advice. 

I'll be happy to try to help you start off "on the right foot."

This strategy can help you preserve your HELOC for other uses while still securing the funds needed for your next investment.

Hope this info helps! 

Are there any key questions that you’ve found particularly helpful for getting constructive feedback?

(I assume trying to get free leads or market their name as the local expert.)If no one at your broker will help, reach out to new realtors.

Considering the area  I am not sure how this poster's LTRs are going, but I own 2 in the area and have helped multiple investors buy and then lease their LTRs in the Buda/Kyle area as well - all are cash flowing.

You want an accountant who can help you strategize and who is responsive when you want to know the consequences of the financial decisions you are making throughout the year.Good luck.

Building departments, typically, are very helpful. 

I am an out of state investor.How have dealt with this issue>Neal Schadler There are multiple property managers in the "build your investing team" section that can help here.