Question juridique clé
Whether the tenant's late submission should be admitted in view of the social investigative principle and cantonal procedural rules.
Solution extraite
The late submission was inadmissible under cantonal law; Art. 274d OR did not override the requirements of Art. 164 ZPO/SG.
Motifs extraits
The federal tenancy investigative principle does not eliminate cantonal limits on new submissions in appeal proceedings. The tenant failed to show timely grounds for admissibility.