Do you have a written lease for four years? Do you have a copy? Are you current on your rent? If so, I would respond to the attorney and tell him that there is a mistake. Best of luck to you.
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If you have a written lease, are current in the rent and not in breach of any other lease covenant, it appears the 30 notice to vacate is improper. I agree with my fellow lawyers, send a copy of the lease by certified mail to the attorney for the landlady and request the reason why you received the 30 day notice. Many landlord/tenant attorneys will give you a free consultation. Seek one out on the AVVO tab if your certified mail letter does not clear this up.