But it had damage to the walls, and floors, the kitchen was in disarray, I assume the bathrooms will be as well.

The house was in BAD shape...We moved the deck, changed the floorpan, moved walls, new floors, bathrooms, kitchen, roof, painting, a bunch of grading work and exterior stuff, new landscaping, exterior trim work, and removed the family of dead raccoons!!

See the Zillow link for the property below; interior is only 2,000 sq. ft not 2,556 (2,556 includes the garage)https://www.zillow.com/homedetails/600-N-13th-Ave-...Work for this house would include turning it into a 3/3 while leaving the existing 2 car garage, 3 brand new bathrooms, remove the wall separating the kitchen from family room, refinish and/or replace kitchen cabinets (countertops will be reused), replace all exterior doors and windows with new impact glass, new HVAC system with duct work, minor electrical (high hats, new fixtures, inspection repairs), paint, new casing/baseboard, and maybe new interior doors.

I'm very much a copper fan myself when redoing bathrooms, mostly for any sort of complicated shower system.

The property will be put on the market soon.We just put in beige wood look plank tile in the bathroom.

A beautifully designed bathroom all brass faucet $40.

We generally use the same contractors so that probably helps a bit on the price.So that's my experience but I'm sure it varies a little across the country.Agree with Pete's post too - certainly if you're adding bathrooms or things that require additional permits, certainly that can add up.

So you would walk from the utility room straight into the master bathroom.

Like, I'd like to build 5 200sqft studios all with private entrances, full bathrooms, and kitchenettes. 

It's a professionals market...professional is not the right word...anyone willing or able to spend the time on deal flow (brokers, direct mail, cold calling, etc.).I just sold a rental in one day above asking price in Greenville for $190 sqft and the property is due for a new roof, wiring, HVAC, kitchen, and bathroom...and they were countering their own offers to make sure they got it (in a multiple offer situation).