Switching Property manager's mid lease?

[Davis Stoner]

Hi all, 

I currently am using a property manager that I believe is doing a sub par job. At this point I own 3 finished units that are fairly new (hopefully low maintenance) so I am thinking about self managing. Two of the units were managed by the PM from the start and they listed themselves as the landlord on the lease. 

Once I "fire" the PM and I become the landlord, does that matter if the lease says that? I feel like it would be a little drastic to have to resign the lease, or maybe it is not a big deal at all and nothing has to be done. Please let me know your thoughts!