21-23 Middle St, Newburyport, MA, Massachusetts 01950. Outstanding opportunity to own a prime retail/office building in the heart of Newburyport. Currently, 2 retail and 5 office suites in the building have many options. Parking in the rear of the building for 4-6 cars. A rare offering. Income is $10,79 monthly and $129,540 a year in current configuration. Expenses are heat and electric approximately $10,000K insurance $2000 per year.