Changing locks, but giving tenants a set?

[Rick Pinney]

On my duplex, I have two tenants. I have asked one to leave even offered them cash for keys. They are inherited tenants and the unit has to be rehabbed in order to be livable. It does not look like they are trying to find a place or packing. I need a set of keys because I have a gut feeling things could "magically" go wrong. Can I inform the tenants, change out both sets of locks l, and give them a set of keys while keeping a set? There lease has been assigned, and there is no key clause. What do you think?