Can a landlord ask a tenant to vacate without cause?

[Michael Wagner]

I am currently in the process of closing on my first property, a duplex that has both units rented through the End of April.  Working with my lender and looking at my financing options available it appears my best option is a first time home buyer program (https://www.wheda.com/home-buyers/available-progra...) allowing me to only put 5% down.  However, with the first time home buyer program there are certain stipulations one of which is it needs to be my primary residence within 60 days after close.  

With that being the case, in the transfer of ownership of the property can I shorten the duration of the current lease or ask the current tenants to vacate early?    

I would prefer not to have to  make the tenants vacate prior to the agreed upon terms.  Does anyone have any other ideas to get out of this particular stipulation?  How is it determined if that property is my primary residence?   Will two months make a difference? 

Does anyone know of any other Wisconsin loan programs that are still advantageous but wouldn't have this hurdle?