When a lease requires the giving of a written notice, the notice is effective upon its receipt. Thus, in this case, the thirty day notice starts to run from the 10th of the month. A private landlord is not required to give a reason for refusing to renew a lease unless the lease so requires. A private landlord merely has to give the tenant notice of non­renewal as required under the lease. If there is no written lease, the landlord has to give the tenant sixty (60) days notice to terminate the tenancy.