I think it's a better business practice for me to find and repair small leaks myself, rather than jousting in court over who's responsible for the damage the big leak caused.

My hope was they would stay longer, but I also could punt out any people causing issues.

Something to think about.Mathematically, I agree with @Christopher Krug but in real life having the spectre of 150K hanging over your head is going to cause you some headaches.

They don't normally come without cause - or maybe they do in your area? 

Needless to say, the wood is rotted and using the shower causes leaking. 

Mom living there is not cause to evict in NY.

This is one major problem that tenants would not complain about since they don't see it, I only found it in monthly visits, And it ran longer, would have caused structural issues.

As in, can I get it back if my estimates are wrong/not close to the actual bids, cause (and this is probably obvious, I know...)

Do any of them use chemicals, any corrosives, are operations expected to be loud or cause noise issues?

Yeah it sounds like something weird when the property sits and no air is circulating the corrosion gets worse on the panel etc.Those older panels are more fickle and the least thing can cause them to be off especially depending on where the panel is located and next to.I am not an electrician but it sounds like it to me.