@Dani Z is right about one thing, consider the source and their motivations, however she has certainly misjudged the source and motivations.  

Like when is the exit how will you exit what if x,y, & z happen. 

You could potentially say that for a kitchen you usually spend X and bathroom Y, floors Z, Paint etc, but since every property requires different amounts of work and levels of finishes it becomes impossible to get an overall number.  

Takes you from A to Z

Quote from @Neal Z.: It's an interesting proposition, but my first inclination is how is time allocated to the possible 8 investors and how much time is allocated for owner use vs revenue driving use. 

Thanks,Helen Z

Or they want x,y,z updated because they mowed your lawn. 

I would also opt for the Z-wave model as the hub could be secured on the property and act as your remote lockout service that you can charge for in the event they forget the code or lose a key, you could also use it to provide a vendor access on short notice and don’t want to give them the main code.

@Jasmine Z. that's good to know.

Doing Z should minimize your tax bill."