<![CDATA[Disputes arising from shop-house lease agreements may occur when tenants alter the building structure without the owner’s consent, resulting in legal issues concerning breach of contract and its evidentiary aspects in court. This study aims to analyze the evidentiary strength of authentic deeds and written admissions in lease disputes involving unauthorized structural alterations. The study employed a normative legal method using statutory, conceptual, and case approaches. The results show that an authentic deed containing a prohibition against structural alterations has perfect and binding evidentiary force regarding the parties’ agreement, as stipulated in Article 1870 of the Indonesian Civil Code. In addition, the Defendant’s written admission in court concerning the removal of wall partitions may serve as evidence supporting the occurrence of an act contrary to the lease agreement. The authentic deed provides an evidentiary basis regarding the rights and obligations of the parties, while the admission strengthens the factual evidence of the prohibited conduct. Therefore, authentic deeds and written admissions have complementary functions in proving breaches of lease agreements and providing legal certainty for the parties in resolving disputes. ]]>
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