The Sunrain lean-to pergola system is an outdoor seating solution that allows businesses to maximize their outdoor space year-round. It features a fully automated retracting roof to regulate sunlight and temperature. Rainwater is directed through an internal drainage system. Optional features include dimmable LED lights, electric heating, various fabric and color options, and glass side screens to fully enclose the area. The structures are customized in different sizes and can be integrated with additional features.