Ownership of an apartment building changed hands, and the landlord for the new owner is demanding unusually high additional monthly payments from preexisting tenants for parking privileges that are guaranteed at no cost under the lease agreement.
This technique has already caused two tenants to vacate the building, and the new tenants that replaced them are being charged markedly higher rent. A preexisting tenant has been advised that the landlord is acting illegally.
The new owner is a Jewish organization, and their landlord is Jewish. One of the preexisting tenants, who is also Jewish, prefers not to have to file a formal complaint with affidavits from other tenants. The tenant prefers to deal with the landlord and the new owner from a religious law perspective.
How should the tenant proceed from the standpoint of Jewish law? Is there any religious law and/or requirement which the landlord and/or owner is contravening in their behaviour?