We then have to cut a manual check to cover.Are you saying that for normal operations, they have a system in place to monitor & pay the taxes?

Schedule 80 does indeed have thicker walls and can handle "more pressure" however you are talking about a sewer system, which will not be under pressure. 

I would recommend sticking with a multi-family that has solid systems and at worst, needs aesthetic upgrades.

Additional features include new SS appliances, recessed lighting, new 200 amp panel and updated electrical in kitchen, a French drain system, and 1 car garage w/ workshop.

Does it have a good school system?  

There are sections of the crawlspace I cannot access for subterranean termite treatment, as well as running new electrical for an AC system, I kept thinking there may be a hidden opening covered by flooring, but if I can't find it then I need to crawl down to the 16" headroom crawlspace with a corded rotary hammer strapped to my ankle, crawl ony belly for over 40 feet to enlarge the congested opening so I can pass through it. 

Had a tenant moving in, mis-matched coils and too small system.  

@Nicole Fischer Check out the LEED Rating System and look for contractors experienced working with it!

It’ll take a lot of solid systems and people you trust.

We improved some bad electrical work (a two-pronged system that wasn't grounded) and did some light cosmetic paint as well as added safety features in a few areas.