The Amporn Sathan Throne Hall is a three-story building designed in an H shape, consisting of two rectangular structures arranged parallel to each other in a north-south orientation, connected by a vertical section. This architectural gem showcases a fusion of Art Nouveau and Moorish styles. It is divided into two main parts: the Amporn Sathan Hall and the Udornphak Hall, which are linked by bridges on both the upper and lower levels. One of the hall's striking features is its front facade, characterized by two curved walls that are elegantly stacked three layers high. The outermost layer serves as a balcony, encasing the inner space, with walls adorned with intricate stucco designs featuring floral and foliate motifs, harmoniously combined with geometric shapes. Above the doors and windows, the architectural details include long, vine-like patterns in wet plaster that race around the building. Moreover, the balconies and railings are crafted from metal, embellished with geometric patterns interspersed with floral designs. The building's interior walls are decorated with stucco patterns and dry plaster paintings depicting floral and avian motifs, beautifully rendered by the Italian artist Cesare Ferro.