She has the contract stating I will purchase under my LLC, however now she is saying underwriting considers it a commercial loan and they don't do those types of commercial. 

I 100% understand that state, county within state, building type, age, depth of coverage, etc., etc., etc. is going to make every property unique, but it would be great to come up with a rough rule of thumb that will allow a conservative estimate.

Was this place built as a warehouse-type structure that has been compartmentalized or does it look like a strip-mall?  

I am personally strongly against any type of mentorship program or course.

This isn’t the type of situation where you hire your aunt Sally’s handyman lolHope this helps.

Yes getting a report from the plumber would be ideal; however, I believe your issue will be no one knew that an open window would cause the pipes to explode. had you given them a notification the first time when it happened then you could say "Hey I explained to you this would happen" or have it written in the lease agreement.

The key will be ensuring you have a good enough (1-1 or higher ideally) DSCR ratio in addition to a strong credit score. 

Seeing more of these "syndicates" and "genius" type groups.

I lived there last year (Redding) and it's a very blue-collar type town. 

My ideal contact with a realtor would be receiving an email when a new property hits the market.