This Buddhist temple is located about 600 meters north east of Kalasan temple on the north side of the main road between Yogyakarta and Solo. It is a slender and beautiful temple consisting of two floors. The upper floor was formerly used to keep religious relics. This temple was formerly a Buddhist sanctuary or Vihara where the Buddhist priest used to live, meditate, and teach their followers. The wall of the temple is also protected with Vajralepa.
source by http://www.jogjatourism.com/html/sari.htm