Question juridique clé
Whether the lease termination was valid when the official form was sent as a photocopy but the accompanying letter was signed.
Solution extraite
Yes. The signed accompanying letter and the photocopied official form formed a single declaration with an evident link, so the termination satisfied the written-form requirement.
Motifs extraits
Art. 266l CO requires written termination on an approved official form, but the signature need not be on the form itself if the signed cover letter clearly incorporates the form and its contents.