Personally, I just rip it down.

I personally feel it's very intrusive to call someone like this, but maybe it's considered acceptable? 

I personally used Jon McGraw in the past and he is extremely knowledgeable in the field. 

The GC is a business person who doesn't care about your ARV, LTV, or your budget.

Perhaps there is a relevant book or podcast that you could suggest to expand my knowledge in this area.Considering you're experience with creative finance deals, which you mentioned previously, I am keen to hear about your personal insights and experiences.

If the IRS has a Form 1098, they assume that the person listed on the form made the payments, and they move on. 

Other CPAs and firms have quoted me 5k-10k+ but are no where near as responsive and personable as my current CPA and accountant.

I find it's very personal, and dependent a lot on your goals, resources, risk tolerance, location, experience, etc.

I found an auction person, and I see listings online.

Others may have personal experience to share.