This is an interesting property with 2 one bedroom apartments and then 3 commercial spaces on the bottom.

-framing cavity's (wall floor and ceiling) should be completely filled with thermal fiber or roxul.if you have a fire door hopefully it is a insulated one and not just a hollow steel shell. a door with a threshold would be best so sound doenst transfer through gap under regular door.if the units are vibrating a lot they should sit on rubber dampers.theres 2 areas to focus on when trying to limit noisevibrations from one material through another like foot steps above or vibrating machinerythe other is airborne sounds like talking and speakersthere are many products available to help you reduce the noise unfortunately it sounds like you may have to invest some more money and time being they are already rehabbed

The plan is to live in the upstairs unit and rent out the bottom.

I’m a contractor by trade so I can handle all the Reno work top to bottom so that aspect doesn’t worry me and I’ll save money on the labor.

OK I'm buying Whirlpool machines $1600-1800  for a top/bottom stackable. 

Bottom 20% of the market in comparison to comparable properties?  

One more thing for you to fix and take away from your bottom line.

You should look into self managing to drastically improve your bottom line.

I plan on adding value by renovating the property top to bottom.

I plan on adding value by renovating the property top to bottom.