The Yellow Room serves as a reception and waiting area for guests and as the venue for signing well-wishing books presented to Their Majesties. The Santi Maitri Building was designed as a multifunctional facility for various official purposes, such as hosting banquets, receiving distinguished foreign guests, conferring royal decorations and awards, holding meetings and seminars, and welcoming numerous domestic visitors, including students, local administrators, and other groups. The outer wing of the Santi Maitri Building was renovated to expand the stage area, providing more space to accommodate the APEC meetings in 2003.