Newly bought duplex but what current tenant out?

[Casey Berli]

I am buying duplex and there is a unit that is occupied. One side is is ready to rent and I want to move into the occupied side to do renovations and rent out the ready to go side. I'm 10 days from closing and the occupied unit has a lease till dec of 2017. Can I give them 30 days to find a new place or do I have to honor there lease. * the lease says no dog and they have two. * lease say to keep unit clean and clutter free. They are living with everything in the house and in the backyard. I live in Michigan. Please help this new landlord ha.