Maybe it’s the commercial lender in me, but I think it’s good business practice to retain, or at the very least have access to, all notices and documents that were given to the tenant.

Doing so puts risks back onto you... unnecessarily.Your head's kind of in the right place but your intentions could be much better served practicing IBC as it was intended to be practiced.You're 10 months into this now and still haven't acted.

For most people DIY is NOT a good option and will probably fail at anything you are trying to accomplish.This is not legal advice, it's practical advice.

The idea is to discourage the small-landlord's practice of nonrenewing leases due to personality conflicts, whether you find the tenant likeable enough, etc.

There's got to be some that specialize in this area of law and business practices.

I have a choice to make on which lender to go with on my rental property refinance, however as I research each lender, I cannot find adequate information about their actual business practices.

Its good practice anyway to start that relationship before you need it for an eviction.  

Is it common practice for the property manger to not communicate about non payment of rent?

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One thing I've noticed many experienced investors are recommending to do, but many first-time investors don't practice is; to go and see the out-of-state property in person.