Is a shared bathroom common or should we add more?

You've listed the "big three", and those are all that are needed for most MTRs, especially if you have a limited number of doors in an area.

Upgrades include a fully remodeled kitchen, renovated bathrooms, new durable flooring, contemporary fixtures, and efficient heating and cooling systems.

Also measure the profit per door and fix or sell the dogs.

It's a multifamily property in a good neighborhood with three units and a total of four bedrooms and three bathrooms.

You opened the front door by unlocking it and then pulling a rope that lifted a lever inside.   

Upon inspection, the pest control company found holes in the walls under the kitchen and bathroom sinks.

@Andreas Mathews admirable, but make sure you do some research so you understand what a PM can make.Starting your own PMC business will require 75-150 doors to make a decent living, depending on gross rents and your fee structre.Working for a SFR PMC as a PM, will require a RE license and you usually get paid a percentage of the gross rents the portfolio of owners/properties you manage generates.

The property is a 3 bedroom, 2 bath (one of the rooms is the master with its bathroom and access to go outside), with a separate garage and an unfinished garage unit.

I can't see how some investors cashflow just $100 per door in some markets.