This document discusses the Urban Design Framework (UDF) for the CATS Lynx Blue Line Extension (BLE) rail project in Charlotte, North Carolina. The UDF provides guidelines for integrating public art and design treatments to mitigate visual impacts of the rail infrastructure. It describes different treatment levels for walls, bridges, fencing, and other system elements based on factors like land use and visibility. Examples of proposed art treatments are provided for various infrastructure components like segmental walls, pile panel walls, and bridges to follow the UDF. The document also discusses community engagement efforts like a project where local residents provided materials for a mosaic wall art piece and shared personal stories with the artist.