Is a bathtub a necessity, or is just a shower adequate?  

I realize in your case, being out of state, having a PM is a necessity, but I'm speaking more in general terms.If this is the only complaint you have with the PM, I wouldn't look to change to a new PM. 

That being said if they really do want something bigger and newer (only because they want it, it is not a necessity), then either you fund it and raise the rent accordingly OR they are able to pay for it with the understanding of your lease agreements (must meet code requirements; must stay with property after the lease is up).  

You view rent as a necessity to pay the mortgage to the bank.

Necessity is the mother of invention.

I am not a landlord by choice---but only necessity.  

It just needs to communicate the necessities.

But, you can ask them (even if they're on disability income) to have their medical professional fax you a letter on their letterhead from their office, that explains why the companion animal is necessary for the applicant/tenant, and how that necessity relates to their disability.You can't ask for specifics - are you schizophrenic.  

First, though, they'd have to sue you to enforce an easement by prescription or necessity that hasn't been recorded (easement created by long-term use, or as a way to get to their own property, which is basically not reachable by any other reasonable means).  

The rest of my team has been put together out of necessity.