Index-linked rent tied to an index other than the CPI – valid?
Likely invalid — such a clause does not bind you.
An index-linked rent may only reference the official German consumer price index published by the Federal Statistical Office (§ 557b para. 1 BGB). Other indices render the clause void.
What you can do next
Reject rent increases based on another index. The clause is invalid.
The law behind it
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General information based on German law and court decisions, checked by lawyers — not legal advice for your individual case.