Rent increase on a currently occupied rental property

[Joe Prenger]

I've got a property in Missouri that i'm purchasing from someone and it is currently rented out. This couple has rented it for nearly a decade and it seems that there hasn't been an increase in the rent since they started renting. They are currently on a month to month lease agreement. Once i purchase i would like to get the property up to current rent rates for the location. What are the legal requirements that must be meant in order to increase the rent? How much notice is needed to be given? Would there be any legal circumstance where the renters would be able to keep their current rent if they do not have a long term lease agreement in place?  Thanks in advance

[Krystal Grubbs]

Under a month to month lease you should be able to raise the rent with a written 30 day notice. Is it an oral month to month tenancy or written?