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The Rent Increase Notice Letter is a crucial document in German residential tenancy law, used when landlords wish to increase rent within the legal framework established by the German Civil Code (BGB). This document must be used whenever a landlord intends to raise the rent to the local comparative level (ortsübliche Vergleichsmiete) or following modernization measures. It must be issued in writing and include specific justifications, calculations, and references to either the local rent index (Mietspiegel), three comparable properties, or an expert opinion. The notice must respect statutory limits (maximum 20% increase within three years in most areas) and comply with local rent control regulations (Mietpreisbremse) where applicable. The timing and format of this notice are strictly regulated, and tenants have specific rights and deadlines to respond.

1. Sender Details: Full name and address of the landlord or property management company

2. Recipient Details: Full name and address of the tenant(s)

3. Date: Date of the notice

4. Subject Line: Clear identification as a rent increase notice (Mieterhöhungsverlangen)

5. Property Identification: Clear description of the rental property including address and any specific unit information

6. Current Rent Statement: Statement of the current rent amount and any included utilities or operating costs

7. New Rent Declaration: Clear statement of the proposed new rent amount and effective date

8. Legal Justification: Explanation of the legal basis for the rent increase (e.g., reference to local comparative rent)

9. Calculation Breakdown: Detailed calculation showing how the new rent amount was determined

10. Tenant Rights Information: Information about the tenant's right to consent or refuse and the relevant deadlines

11. Signature: Landlord's or authorized representative's signature