This LEGO Creator Expert Assembly Square building set, item number 10255, was produced by LEGO to commemorate the 10th anniversary of the Modular Buildings series. The set is constructed from molded plastic components and contains 4,002 pieces. Designed for builders aged 16 and older, the finished model depicts a detailed multi-story street scene. Functional elements include opening doors and windows. The set features various interior locations such as a bakery, flower shop, cafe, music store, photo studio, dental office, and a residential apartment. It includes an assortment of minifigures and a baby figurine.