When an how much can a landlord raise the rent?
Since XYZ Apartments has both month-to-month tenants and tenants under lease agreements, Landlord A cannot raise the rent for all tenants of XYZ Apartments.
If you have a written lease your landlord can't raise the rent until the end of the lease period. A lease is a rental agreement that covers a specific period of time, such as a year or six months. Therefore, Tenant B does not have to comply with the rent increase.
If your agreement does not specify a certain period of time or if you don't have a written agreement, you have what is called a month-to-month tenancy. With a month-to-month tenancy, a landlord can usually raise the rent after giving 30 days notice. Therefore, Tenant A must pay the rent increase.