The origin of Mulleriyawa Hospital go back to the 1960′s. It is situated in the heart of Colombo East blends in with its surrounding residential neighborhoods of Kolonnawa, Kaduwela, Kelaniya & Kotikawatte. The land area was about 117 acres. The Mulleriyawa Mental Hospital opened it doors in early 70′s and merged with Nurses Training School in 1980′s. Then it was named as Mental Hospital (Teaching) – Mulleriyawa. It was consisted of two units namely Unit 01(for male patients) & Unit 02 (for female patients).