Terminating a tenant lease so I can move into a building

[Dan McGrew]

I live in Chicago, and I'm closing on a 4 unit property in a couple weeks.  We plan to make one of the units in the building our primary residence.  The mortgage laws, as I understand them, require us to move into the building within 60 days of close.  None of the units' leases expire before the end of that 60 day period.  I can't get a clear hold on the local laws as to whether I can terminate a tenant's lease without cause just due to the building being sold (and now me becoming the owner).  It just seems crazy to me that the laws would require us to move in within 60 days given that this might not always work out very easily.  Is that because the new owner can always terminate a lease at their choosing when they purchase a new property?  Or is the expectation that if timing doesn't work out, that I as the new owner offer a tenant some money in order for them to accept an early termination?