The Addendum Tenancy Agreement is a essential legal instrument in Belgian property law, used when parties need to modify an existing lease agreement without creating an entirely new contract. This document type is particularly relevant in situations requiring formal documentation of changes to rental terms, such as rent adjustments, lease extensions, or modifications to property use conditions. It must comply with Belgian federal civil law and specific regional housing regulations (Brussels, Flanders, or Wallonia region). The addendum becomes an integral part of the original lease agreement and requires proper registration with relevant authorities when mandatory. Typically used by property managers, landlords, and tenants, this document ensures that modifications to existing lease arrangements are legally binding and properly documented while maintaining the validity of the original agreement's unmodified terms.
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1. Parties: Identification of landlord and tenant(s) with full legal names and addresses
2. Background: Reference to the original tenancy agreement including date, property address, and registration details
3. Definitions: Key terms used in the addendum, including reference to definitions from original agreement
4. Purpose of Amendment: Clear statement of the purpose and scope of the addendum
5. Modifications: Detailed description of specific changes to the original agreement, with reference to relevant clause numbers
6. Effective Date: Date when the modifications take effect
7. Confirmation of Other Terms: Statement confirming all other terms of original agreement remain unchanged
8. Signatures: Execution block for all parties, including date and place of signing
1. Rental Amount Modification: Used when changing rent amounts, including indexation calculations if applicable
2. Term Extension: Used when modifying the duration of the lease
3. Property Modifications: Used when documenting agreed changes to the property or permitted uses
4. Additional Occupants: Used when adding new tenants or occupants to the agreement
5. Payment Terms: Used when modifying payment methods or schedules
6. Security Deposit Adjustment: Used when modifying security deposit arrangements
7. Special Conditions: Used for any unique or specific modifications not covered by other sections
8. Registration Declaration: Used when specific registration requirements apply to the modifications
1. Schedule of Modifications: Detailed list of all changes with reference to original agreement clauses
2. Updated Rent Calculation: Breakdown of new rent calculations including indexation if applicable
3. Property Modification Plans: Plans or specifications for any agreed property modifications
4. Updated Property Inventory: If modifications affect the property inventory
5. Consent Documents: Any required third-party consents or approvals
6. Registration Documents: Copies of registration documents if modifications require registration
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