1. Rent Reduction Notice: Notice of intention to reduce rent (Mietminderung) if applicable - use when damage significantly affects living conditions

2. Previous Correspondence Reference: Reference to previous communications - include if there have been prior attempts to resolve the issue

3. Health and Safety Concerns: Description of any health risks - include if mold or other health hazards are present

4. Cost Documentation: Details of any costs incurred - include if tenant has paid for temporary repairs or suffered property damage

1. Photographic Evidence: Photos documenting the water damage and affected areas

2. Communication Log: Copies of previous emails, messages, or notes from conversations about the issue

3. Expert Assessment: Any professional evaluations or reports about the damage

4. Damage Documentation: List and photos of damaged personal property if applicable

5. Witness Statements: Statements from neighbors or other witnesses if relevant