MultiFamily new landlord

[Geoffrey Morales]

I just took ownership of a Multiplex with 4 units. I have two long term (6 years and 12 years) tenants are on a month to month lease, one tenant that just signed a lease agreement in November and another tentant that is on their 6th month of their year lease. 

The question is do I honor the leases agreements from the prior owner? 

For the month to month tenants do I put them into a new year lease aggreement?

All rents are below market value, when and to which tenants can I raise rents ?