legal 2 family setup as 3

[Mike Mitchell]

I recently purchased a legal 2 family house that is setup as 3, My brother will be living in the illegal unit for free as he will be managing the property. What are my options for handling utilites for the illegal unit (no lease) and the unit that it will share utilites with.. Can I include in the lease that all bills will be shared between the 2 units? or do I have to rent with everything included? is there a better option.

thanks in advance