Located on 21 rai ( 3 hectares ) of Chulalongkorn University land on the northeastern corner of Sam Yan Intersection (Phaya Thai and Rama IV Roads) next to the Thai Red Cross Society and opposite Wat Hua Lamphong, Chamchuri Square is directly connected to the metro's Sam Yan Station; it is the first and (as of 2009 lc=yes ) only building to feature such an internal connection.