Please speak with an attorney in your area because the Real Property Law in the state of Massachusetts differs considerably than the rest of the country.  Now, I am considering the property as commercial real estate given that the original owner rents it assumedly for profit.  It is my understanding of the law there that the purchase of the property comes with it what is known as an assignment and assumption of leases, meaning that the new owner must honor your lease.  There are many theories under the law allowing you to collect against the parties here should you get in to a legal battle. Get advice. Good luck.