Distinguishing Rent Determination Actions (TCO Art. 344–345) from Hardship Adaptation Suits (TCO Art. 138) in Commercial and Residential Leases
Turkish Code of Obligations No. 6098 provides two distinct mechanisms for rent adjustment: rent determination lawsuits after five years of tenancy under Articles 344(3) and 345, and hardship adaptation actions under Article 138 triggered by extraordinary, unforeseeable events. Their procedural notice rules, retroactivity, and evidentiary thresholds differ fundamentally.
Rent Determination After Five Years of Tenancy (TCO Art. 344/3)
Under Article 344(1) of the Turkish Code of Obligations No. 6098 ("TCO"), annual rent escalation clauses in residential and roofed commercial leases are capped at the twelve-month average Consumer Price Index (CPI) rate.
Pursuant to Article 344(3), however, in leases exceeding five years or renewed after five years—and at the end of every subsequent five-year cycle—the court determines the rent equitably by weighing the twelve-month CPI average, the physical condition of the leased premises, and comparable market rents, regardless of prior contractual caps. Settled Court of Cassation jurisprudence applies an equitable "existing-tenant discount" to the vacant market benchmark established by court-appointed experts.
Retroactivity to the New Lease Term and Notice Rules (TCO Art. 345)
While a rent determination action may be filed at any time, Article 345 stipulates that the determined rent takes effect from the beginning of the new lease year only if: (i) the lawsuit is filed—or written increase notice is served—at least thirty days prior to the new term's commencement, or (ii) the lease agreement already contains an annual rent increase clause, in which case filing at any point before the end of that new term preserves term-start applicability.
Distinction from Hardship Adaptation Under TCO Article 138
Unlike Article 344(3), an adaptation action under Article 138 requires an extraordinary, unforeseeable event outside the debtor's sphere that renders performance excessively onerous under good faith. It does not require five years to have elapsed, carries a strict evidentiary burden, and operates prospectively from the date of filing rather than the start of the lease period.
Statutory Questions & Practical Scope
Is mandatory mediation a precondition before filing a rent determination lawsuit?+
Yes. Pursuant to Article 18/B of Law on Mediation in Civil Disputes No. 6325, applying to a mediator is a mandatory procedural prerequisite for lease disputes prior to litigation.
Can the claimed rent amount be increased later via procedural amendment (ıslah)?+
No. Under binding Court of Cassation Unification of Judgments principles, rent determination claims are indivisible and cannot be filed as partial/indefinite claims or increased via procedural amendment.
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