The Lego Flatiron Building 21023 is a 471-piece set from the LEGO Architecture series, featuring the iconic New York landmark. Released in 2015, this retired set includes all the pieces needed to build a detailed replica of the Flatiron Building, measuring 7.5 inches in length, 2.4 inches in height, and 10.3 inches in width. Made of plastic, this collectible set is suitable for ages 12 and up, making it a challenging yet rewarding project for fans of LEGO and architecture alike.