This would probably also be the simplest route.    

The simplest way is to continue renting by the room, and just add your space to the equation.

Count on paying occupancy taxes (which vary), income taxes, and perhaps licensing and inspection fees - that would be the simplest advice I can give you.

Either way the simplest partnership is splitting profits 50-50 between her and you (and your husband).

IMO, the frugal would likely much prefer to grow their own fruits and vegetables, shop for raw quality ingredients, and invest a bit more time and money in their food in the short term to cook their own meals with quality ingredients in order to achieve the long term benefits of eating more healthy, while still saving money over going out to eat.

I don't want to respond to someone who isn't interested in taking the simplest effort into themselves.

And maybe they will be able to close a property without a middleman, real estate agent or closing attorney, but I've learned over the years that most people cannot sell their own homes as they will destroy a sale over the simplest things, and half my job is saving them from themselves and getting the deal done.  

I am looking to buy my next investment property, a fourplex to be more specific.We got an 80% LTV heloc on our duplex househack as an opportunity fund.Then simplest I'd imagine going forward is conventional 4-plex primary mortgage when your 1099 traveling nurse income has 2 years.   

Not to tell you something, but to press your case in the legal system and try to collect something.The simplest outcome would be for you to sell your interest to this guy for the amount you want.

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.