This might be a lot of new information for you so feel free to ask if you have any questions.As has already been suggested, you might want to consult with a good real estate attorney who practices in the area where the property is located. 

It is good practice to obtain from them the actual 1098 and to remind them that they are no longer entitled to the deduction since they aren't making the payments anymore (again, these things are usually spelled out in the sub2 agreement).

For the past few months, I have been watching YouTube videos, listening to podcasts, and practicing with deal analyzers.

And if income passes into the holding LLC, what is the best practice for pulling that cash out to utilize for other purposes while preserving the veil and not commingling.  

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

I had a situation this last yaer where I had a simultaneously recorded first and second (in practicality).

Very often mold is caused by poor cleaning practices or excessive moisture in an area.

The studies being released show how different industries appear to be increasing their profits with hidden or bogus fees that can harm consumers and companies that have honest business practices. 

Learning the theory or the real practical part of the business.

I'm not that professional but I think a whole house filter would filter particulates like dirt but not chlorine. for chlorine you might need a reverse osmosis system for a specific drinking water tap to eliminate the taste as it's not practical or efficient to put an RO on the whole house supply. if skin issues from bathing are a problem you might need a softener. sometimes when kids have eczema doctors actually prescribe "bleach baths" where a small amount of chlorine bleach is added to the bath water. also many of the water treatment systems can be rented so maybe just rent it while they are there. regardless, proceed with data. water test, pediatrician diagnosis (if it's legal to ask for, no clue), and a system that is right for the application. sounds like the tenant is willing to help out which is awesome.