 The avenue forms the northern boundary of the formerly proposed Diliman Quadrangle within the former Diliman Estate also known as Hacienda de Tuason, purchased by the Philippine Commonwealth government in 1939 as the new capital to replace Manila.It was originally planned as the new city's Central Park housing the new national government buildings (the new Presidential palace, Capitol Building, and Supreme Court complex) within the elliptical site now known as the Quezon Memorial Circle.The quadrangle is bordered on the north by North Avenue, on the east by East Avenue, on the south by Timog (South) Avenue, and on the west by West Avenue.