Ellerslie is the Himachal Pradesh Secretariat, which is also known as Raj Bhawan. It hosts assemblies of Vidhan Sabha. The Ellerslie building was designed by Lt. Col. H.E.S. Abbott over hundreds of years ago during the British Empire.The structure was constructed after dismantling an old building of the same name that housed the military department of the Punjab Government until 1886. Thereafter, the building is connected with Barnes Court where the interiors of the building feature brickwork of lime mortar cementing.The building of Ellerslie was taken over by the Himachal Pradesh Secretariat in the summer’s assembly of 1967. In July 1972, the 'Summit Hall' hosted cabinet meetings and was named after the initial summit meeting for Shimla Agreement between India and Pakistan. The building has a sub-basement along with basement and three floors, which has 143 rooms and 31 public conveniences