Locally sourced materials including wood and stone are refined and polished with organic patterns like a willow motif. Positioned to maximize views of the Viejas Mountain, the property draws inspiration from the natural beauty of the surrounding scenery. The existing Viejas Casino was also expanded. Locally based studio IGroup Design spearheaded the development of the luxe resort within a resort that is home to a full-service spa, fitness center, and salt water pool. The Viejas Casino & Resort in San Diego has introduced the Willows Hotel & Spa.