At number 21 on Philly YIMBY’s December Development Countdown is the 340-foot-tall, 27-story tower planned at 1620 Sansom Street in the Rittenhouse Square area of Center City. Designed by Solomon Cordwell Buenz, a firm that is behind a number of recent projects in the city, and developed by the Southern Land Company, the 298-unit tower will have a total square footage of 376,900 square feet, with 19,600 square feet of restaurant space, 5,200 square feet of retail, and 67 parking spaces on three underground levels. Though the tower which is located just two blocks to the south of Liberty Place, it will have a significant impact on the surrounding area, which lacks modern structures of a similar size. No progress has been observed at the sits since demolition and construction permits were filed in September.