Question juridique clé
Whether the rent increase notices were null because the form used had allegedly lost validity after a later cantonal approval
Solution extraite
No. The earlier officially approved form remained valid because the later publication did not undermine the material statutory requirements and served only legal certainty.
Motifs extraits
The essential protection lies in state-controlled official information to tenants. Since the old and new forms contained the same required information under Art. 19 OBLF, and the form had been officially approved by the canton, nullity was not warranted; the later publication was a regulatory measure, not a material defect.