Kernrechtsfrage
Whether the tenants could still challenge the initial rent after the landlord served the official rent form late.
Extrahierter Entscheid
Yes. A late official notice did not extinguish the tenants' right to seek rent reduction and reimbursement.
Extrahierte Begründung
Where the landlord omits or delays the mandatory notice of the previous rent, the lease is invalid as to the rent clause and the tenant may seek judicial fixation of the rent.