Tenant's Acceptance of Renewed Lease Waives Challenge to Rent Increase Calculation

A dispute arose concerning a lease agreement where the tenant, after being notified of a significant rent increase, accepted the renewal under the new terms but later sought to invalidate the increase, claiming the notice was flawed due to an incorrect calculation of the index used for adjustment. The court rejected the tenant's appeal, reasoning that the acceptance of the renewal under the new conditions, without timely reservation or contestation regarding the calculation method at the time of acceptance, constituted a definitive waiver of the right to challenge the rent increase based on a subsequent claim of a minor arithmetic error in the underlying index application.