Lessor v. Tenant: Unauthorized Leasehold Alterations and Contract Rescission

A lessor sought the rescission of a lease agreement and damages, claiming the tenant had materially altered the leased premises by installing equipment without authorization, thereby breaching a contractual clause that prohibited such modifications without the landlord's written consent. The court of first instance found in favor of the lessor, a decision upheld by the appellate court, which determined that the unauthorized installation constituted a serious breach justifying termination and damages. The highest court rejected the appeal, reasoning that the tenant's failure to obtain prior written authorization for the modifications, explicitly required by the lease, constituted a sufficiently serious fault to justify the rescission of the contract, affirming the lower courts' findings based on the established facts.