However, if they wanted to justify it, I'm sure the justification is that renters cause more problems than owners; renters tend to live then shorter periods of time and there are expenses when someone moves in/out such as extra trash pick-ups, programming them into an entry system, cleaning costs as the move in/out can be messy around the building, light damage to the building, scheduling of the freight elevator, cost of providing additional notices as now the tenant and owner need to receive copies, etc.

The biggest determining factor of a profitable investment is a competent manager.

It doesn't seem like a ton of money, but owning this one is definitely slowing my progress toward picking up actual money-making investment properties. 

My cleaning team went, picked them up and dropped them off at my STR. 

I also agree with others.. would determine what your property is worth, add a large (but not insane) premium and ask that. 

Shellpoint should pick up their phone.

The price is really determined by you.

I was wondering how do you determine if a renovation is going to add any significant value to a home?

The more adversarial your approach the higher the risk in increasing the cost.To determine the boundaries, check the legal descriptions of the properties in both of the deeds.

Surely there should be some way of determining this online so I can then go out there with this knowledge and get more specifics?