Typically a three-conductor cable (black, red and white, plus a bare ground not included in this wire count) is used when you need alternate paths for the hot voltage to reach a device.

Its common to have issues pop up like this during the purchase of a new rental property, so don't lose your cool.

You can see them in the wood now and it is kind of cool, giving the floor even more character.After-Now that the floors were all prepped and ready, we could have them bring in the cabinets and countertops that we had ordered.

I would do a new central air furnace with Natural Gas forced hot air and A/C for the cooling.  

this interesting article in the Washington post (with very cool maps) says it all wrt costal vs fly over states real estate values...https://www.washingtonpost.com/news/wonk/wp/2016/01/12/a-stunning-map-shows-how-living-on-americas-coasts-really-is-so-different/?

AND they have some cool access panel doors in the plumbing dept of all the big box stores. 

Rehabbers are fighting over deals in many markets.Profit margins are becoming thinner and thinner.A few years ago, you can buy a house worth $200K for $50K, put $50K of repairs in it and come out - after all expenses - making a cool $50K.

Cool thanks for the words of encouragement.

That's really cool.

Very cool idea, and ambitious, especially in California.