Question juridique clé
Whether the cantonal appeal court's finding that no lease existed could be challenged in a civil-law appeal to the Federal Supreme Court without a constitutional complaint.
Solution extraite
No. The court held that the jurisdictional issue turned on cantonal law, and the appellants did not invoke or substantiate a constitutional violation linked to that cantonal rule.
Motifs extraits
The Geneva rule on the tenancy court's jurisdiction was cantonal law. When cantonal law uses federal notions or makes a preliminary federal-law assessment, that does not transform the matter into federal law. Under the LTF, pure cantonal-law issues are not directly reviewable absent a properly reasoned constitutional complaint.