Key legal question
Whether A. had standing to challenge the lease termination and pursue lease-related claims.
Extracted holding
A. remained affected by the canton-level decision and could participate, but the merits turned on B. being the only contractual tenant after the 1994 assumption.
Extracted reasoning
He was not the sole tenant after the 1994 assumption, yet he had appeared throughout the proceedings and was jointly liable for costs; the appeal was therefore not wholly inadmissible as to him.