The city of Savannah, Province of Georgia, was laid out in 1733, in what was colonial America, around four open squares, each surrounded by four residential ("tything") blocks and four civic ("trust") blocks. The layout of a square and eight surrounding blocks was known as a "ward." The original plan (now known as the Oglethorpe Plan) was part of a larger regional plan that included gardens, farms, and "out-lying villages." Once the four wards were developed in the mid-1730s, two additional wards were laid. Oglethorpe's agrarian balance was abandoned after the Georgia Trustee period. Additional squares were added during the late 18th and 19th centuries, and by 1851 there were 24 squares in the city. In the 20th century, three of the squares were demolished or altered beyond recognition, leaving 21. In 2010, one of the three "lost" squares, Ellis, was reclaimed.