Black Walnut Urban Town Residences is a new townhouse and single family home development by Greentown Developments at 107 Concession Street, Cambridge. The development was completed in 2019. Sales for available units range in price from $629,900 to over $644,900. Black Walnut Urban Town Residences has a total of 21 units. Sizes range from 1841 to 1949 square feet.