Legal Question in Landlord & Tenant Law in Ohio

In Ohio, much would depend upon whether the agreement you had was in writing and its duration. Since you say that you have it in writing, as long as you have a copy of it, that should be sufficient to prove the agreement. Remember that your agreement is not with the rental manager, but with the owner of the property for whom the rental manager acts. Thus they can have 100 rental managers, and change them every day if they want, but the agreement with the property owner for whom these managers act does not change.

The key question here is the duration of this written agreement. If the written agreement does not give a set period of time for which it is good, then it is little better than a month to month tenancy, which can be ended or altered at any time and by either party to the agreement and for any reason so long as 30 days notice is given from one side to the other.