Scottish's main base moved in 1974 to custom built facilities on Renfield Street in Cowcaddens on land opposite the Theatre Royal site. Construction began on the new base in 1972 - it was officially opened on 12 December 1974 by Princess Alexandra, and expanded to accommodate further production in 1978. Following the completion of the new studio complex, the Theatre Royal was sold to Scottish Opera to become the first national opera house in Scotland, and the home of Scottish Opera and Scottish Ballet.