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The landlord can be guilty of what is commonly called "bait and switch" which is an unfair and deceptive business practice. Furthermore, your lease guarantees you a habitable premises and this is not a habitable premises and as such the landlord is in breach of lease. You need to send the landlord a letter informing him that showing you one unit and renting another is an unfair and deceptive business practice and also they are in breach of lease for not providing a habitable premises and as such you find that they are in breach of the lease and if they do not refund any of your money paid and cancel the lease, you would file a complaint with the Attorney General's Consumer Protection Unit, with the local health and building inspector and also file a civil suit under the unfair and deceptive practices act for triple damages plus attorney's fees.
If the landlord refuses to cancel the lease and refund any money you paid them, then you would file your complaints as stated above and file suit against them in the small claims court for your damages and up to triple damages for unfair and deceptive practices by using bait and switch tactics.