The replacement window is the manufacturer's largest standard size window that will fit within the existing frame or existing rough opening. Every dwelling must have two exits at least 36 inches wide and 80 inches high which provide unobstructed travel to the outside of the building.Part I. General Information. At the heart of the LVXP project is a massive entertainment complex to attract big events and major sports teams. You can choose to add windows to the building, allowing natural light to flood the space. Permits for commercial, industrial, and multi-family developments will only be issued to appropriate.