If your books are kept up to date and properly maintained you will be able to calculate whichever ROI you are looking to quantify at any time.

I can't properly waterproof my basement without having theirs waterproofed as well.

I have found "Proper" to be "improper" in almost every quote I have gotten - they were twice or more as anyone else.

If you are just looking to make a deal, being able to do proper due diligence, analyze the deal, remodel a house, etc. 

It certainly sounds like a spring snapped and the full weight fo the door came down.

I say this because we're seeing a shortage in housing with low-interest rates drawing in more buyers and, because of the forbearance program, folks can sit tight and weight to sell their home for more as home prices are increasing. 

I'm sure there is a way to give weight for particular attributes that are important to a Landlord, but I never did very well in statistics, LOL. 

Unfortunately you will have to spend money to defend but in some cases you can recoup legal fees if you prevail and the suit is baseless.The key is to make sure that you know what your doing first and foremost, Structure your deals correctly and provide proper, complete and thorough disclosures.

How would I make the proper trusted connections?

When building up you may need to reinforce the structure below to accommodate the additional weight.