Cornerstone Properties is a full-service real estate company located in Boston. The company offers a range of apartments for rent, as well as condominiums and buildings for sale in the areas of Beacon Hill, Back Bay, South Boston, East Boston and Somerville. Its rental apartments include several amenities, such as kitchen cabinets, hardwood floors, marble vanities, 24-hour concierge service, elevators, dishwashers and private balconies. In addition, Cornerstone Properties provides a variety of online real estate tools, including mortgage payment calculators and a real estate dictionary, as well as information related to local neighborhoods and real estate tax.