He must have a stack of JV agreements in the bathroom just in case he runs out of toilet paper. 

once you actually identify a specific property, you need real numbers.in a duplex you may have two of everything (unless some utilities are shared) - two furnaces, two water heaters, two sets of appliances, lots of bathrooms. 

I'm a newbie trying to rent out rooms in my 4-bedroom, 3-bathroom house in Seattle.

Anyway, it was originally a 2 bedroom 1 bathroom.

The renovation is significant (flooring, counters, heating, upgrading the bathrooms, etc.), but not a complete remodel (not adding or expanding structures).

This has put a cut on our cashflow and we have had some major expenses, like a new roof,  water heater, bathroom remodel, and kitchen remodel all done at the 3 bed house.

The previous owner added an unpermitted bathroom to the downstairs and this small storage room (walls and a door were put up).

I recently added a micro half bathroom to a little unit.  

At one point a plumber checking a toilet leak identified subfloor damage requiring the bathroom floor to be taken up and repaired.

As someone who grew up with his mom cooking drugs in the bathroom (wow...