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An Extension Letter is a crucial document used when parties wish to continue their contractual relationship beyond the original termination date. This document type is particularly relevant in the Philippine business context where formal documentation of contract modifications is required under the Civil Code. The Extension Letter serves as an addendum to the original agreement, specifically modifying its duration while typically preserving all other terms and conditions. It's commonly used in various situations such as lease extensions, service contract continuations, or project timeline modifications. The document must comply with Philippine legal requirements and should clearly reference the original agreement, state the new termination date, and include proper execution by authorized representatives. Extension Letters are particularly important in maintaining business continuity while avoiding the need to draft and negotiate entirely new agreements.

1. Letter Header: Date, recipient's name and address, and reference line identifying the original agreement

2. Salutation: Formal greeting to the appropriate representative of the other party

3. Reference to Original Agreement: Clear identification of the original agreement including its title, parties, and execution date

4. Extension Declaration: Clear statement of the extension being granted and the new termination date

5. Confirmation of Other Terms: Statement confirming that all other terms and conditions of the original agreement remain unchanged

6. Execution Requirements: Request for countersignature and return of the executed copy if required

7. Closing: Standard letter closing, signature block with full signatory details