In 1959, Blankstein and Coop were joined by architects Alan Hanna[REF] and R. Douglas Gillmor[REF] to form Blankstein, Coop, Gillmor and Hanna.
In 1962, the expanded firm won a national competition for the Mendel Art Gallery and Conservatory in Saskatoon (constructed in 1965),[REF] a major creative cultural centre for that city.