Can I change provision for month to month lease?

[Robin Evans]

Hi BP friends we just closed on a 4-unit mixed use property (super excited!)and inherited three units' tenants. One tenant's one-year lease is up but a new lease is not signed previously so she is on month to month now. But there is nothing mentioned in lease on where to park other than 2 cars are allowed for her. Our questions: 1. Can we sign a new lease with her now? If we can, do we have to honor all the provisions in the old lease?  2. Can we add parking rules that we are going to designate a specific parking spot to each tenant? 3. For the one-year lease tenant, do we need to resign a lease with her with old provisions?  Or can we sign a new lease with our own provisions?  Thank you in advance for any input!