After experiencing a serious damage via frozen pipes and insurance covered renovation - I feel like I need to figure out where I am with this rental and determine what to do with it.

An appeal shall lie from the judgment of a general district court, in any proceeding under this article, to the circuit court in the same manner and with like effect and upon like security as appeals taken under the provisions of § 16.1-106 et seq. except as specifically provided in this section.

If it's completely obvious cracked to hell, and crumbling then save the few hundred dollars you would spend on an engineer and go straight to a contractor but just remember they are in the business of doing repairs (sometimes not the most cost effective either) not giving you the best advice.

Subsequently, it can effect your utilization rate.For example, I had a commercial line of credit, that had not been reported to my credit reports.

This is a common and effective strategy for long-term, generational wealth building.

But for an LLC that is lending or investing in deeds, is this appropriate as a general LLC policy might protect against injury or property damage, company autos, etc. – none of which is applicable when the LLC strictly engages in paper transactions without employees and a physical office. 

Additionally it is unlikely to run long enough to really have an effect on the humidity.

It's been pretty effective for us when we've used it 

I found out it could be upwards of $4500 to clean depending on the extent of damage!

What is the most effective way to estimate rents for multifamily rentals?