At the dispute which was the subject of the Decision of the 6th Chamber of the Court of High Appeals with the date February 11th,2015 and Essentials. 2004/13763, Decision numbered 2015/1173, a lease determination case was filed at the sixth term of a lease contract signed for ten years and the local court has accepted half of the file by taking the Manufacturers Price Index into consideration. The Chamber of the Court of High Appeals stated that the lease contract was formed for ten years and the increase in the amount of lease per month was regulated by the mentioned contract, For this reason, this article should be applied. Followingly the increase in the amount of lease should be calculated. The Court of High Appeals has reversed the local courts judgement. According to us in the lease contracts that are in the frame of residence and roofed workplace leases, if the contract is formed for over five years, a lease amount determination case can not be filed after the sixth term as per the Art. 344/III. In a situation where there is a lease contract containing a lease increase clause, a determination case is not a determination case from a technical point of view and the new amount of lease should be determined by the court according to the increase clause regulated by the lease contract.