Office space for lease. Landmark building in the heart of downtown Cambridge. New owners. Significant upgrades to building systems and common areas. New hallways, bathrooms, lighting, HVAC and elevators. More upgrades in the works. Spaces range from below 1,200 square feet to 17,266 square feet for a full floor.  Rent is $9.00 per RSF Net in the tower and $11.00 RSF Net on the ground floor.  See individual suite listings for exact sizes and layouts.