Your information regarding the Turkish Law specifically regulating rent(lease) contracts seems true.The Act on the Leasing of Real Estates, numbered 6570 lays down the applicable rules along with the Turkish Code of Obligatios. First of all , the termination of lease regarding real estates in Turkish Law requires a "valid cause", which have been enumerated in a limited manner, such as non-payment of rental, breach of lease, requirement of the landlord or his dependants to rent the house for their own needs, essential re-construction or repair of the house, a written commitment on a fixed date for evacuation or acquisition of the house by a third party who has a real requirement to rent the house for his own needs.

If you believe having one of these causes in your case, then a notice to quit the property should be given to the tenant.İf the tenant does not comply with the notice and keeps residing, then you must file a suit for release.

Keep in mind that, no ground or cause for termination of the lease is required for the real estates in rural areas which stay outside the municipal boundaires (such as rural ares or villages), but the expiry date (and a due notice for not renewal) of the lease period is considered adequate for evictment.