What do I do if my old tenants don't close on there house.

[Ray Thorsen]

I have a tenant who is buying a house and moving out of mine......I hope.  They were supposed to close 3 weeks ago and are due to move out April 10. I have a tenant ready to move in may 1. If they issued notice and are not out on the date they specified do I have to evict them in the same fashion as if they didn't pay rent. There lease has expired so they have been mtm for a few months while they were looking to buy a house.