Walls? 

Using a calculator designed for single family acquisitions to underwrite a multifamily property is like trying to pound a nail into the wall with a screwdriver.

The goal is to put your passive income goal on the wall, make sure it exceeds your expenses, attack it every day, and once you hit it, you are financially free.

In some instances you can simply replace a broken section, if you have several brakes, broken pipes in the walls, or old plumbing you may find replacing all lines to be the best option. 

When I say trying to figure out cost I mean price per square for engineered floors or price per square to paint two coats wall and ceiling inside a house, etc. 

Walls have moved and previous repair was inadequate and unprofessional.

removed wall between dining and living room to have a more open floor plan.

Some of them leave out important details like, how to cut your tile to fit against walls that aren't square.

The general idea is to renovate the kitchen with new cabinet & counter top; Update all the restrooms; patch up all walls; remove pop-corn ceiling, repaint whole house; re-sand and re-stain all the hardwood floor; some plumbing work; install can lights in all rooms; move some lighting fixtures; add/move switches and wire for Ethernet.

I’ve already begun replacing wall switches with SmartThings devices just so I can make sure all the lights are off when someone checks out.