Unless there is negligence on your part where you aren't repairing an item that needs repair, this is a non-issue other than a tenant complaining. 

They broke one (i suspect negligence) of the recycling containers and now they asked me for a replacement.

There are other misc fees when you close, but that's negligible. 

A couple of months later - due to a number of other issues between us - I switched to a new PM.Of note here is that the old PM actually wanted to end the relationship with me: besides my pointing out general negligence concerns in the month leading up to that, I also began to ask for any/all contractor invoices to be forwarded to me, as I started to suspect issues with being overcharged for repairs.

Most important would be contacting a lawyer who can go through your PM agreement/contract and see what the transition process is and if it is possible to hold them liable for any financial damages incurred due to their negligence.

Your liability insurance as a GC does not cover the building itself, the land and any claims which happen at the home ie; a child walks by and falls on a rusty nail and claims you are negligent, a contractor injures himself claiming it was the owner of the home's fault, the buyer of the home claims the LLC was at fault and misrepresented some fact. 

Im facing to huge lose and my attorney do not accept his firm negligence 

It will take several hours, but it is on them for their negligence.

The attorney I spoke to about methodology of maintaining the corporate veil, he laughed and told me they get after you for negligence.

More often than not agents are pushing deals for a commission and unless there is some type of gross negligence there’s not much that we can do.