Legal Question in Landlord & Tenant Law in California

Notices to tenants can be mailed. However the rest of this sounds highly illegal. Since the beginning of 2021, rent increases are limited to the rate of inflation plus 5% unless you are in a building built after 2004, a single family home, or a duplex where the owner occupies the other unit. Even if the rent increase is legal, California also now has a "just cause" eviction law. That means you can't just give a 30 or 60 day notice. A landlord must have "just cause" such a failure to pay rent, or other violation of the lease, or something like intent to move themselves or family into the unit. There are other "just causes" but a landlord can't just issue a notice for no reason.