What is the tax treatment with respect to reporting, depreciaiton, etc.

Inventory is not eligible for capital gains treatment.

You want a termite company to come back and certify no current activity and set up a treatment plan to pass on.

LLC has more tax treatment options (taxed as a sub S) and better protection than a land trust, if managed correctly.

If you are flipping a lot of homes you could be considered a dealer and not be eligible for any capital gains treatment.

Have around 100 MHP- About half with waste water treatment plants.

I'm curious on how best to structure this approach: Who owns what, who gets what, rental income & depreciation (all tax treatment).

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.

Eventually, he shifted his attention to me, and now I receive the same treatment.

@Christina Galdieri I agree with the comments on the window treatment replacement and the floor to be tiled (looks like a small bath of probably 50 or so square feet of floor tile, so shouldn't be too expensive to make it look semi-custom).