The Adath Israel Congregation first met in a rented hall in 1930. In 1936, land was bought in Outremont; in 1938 the synagogue was incorporated; by 1940 the building was completed. The Adath Israel, an Orthodox synagogue, also ran the first congregational day school in Canada in the synagogue building; a school was built in 1947. A Hebrew high school, the Adath Israel Academy, was begun in 1952, also with its own building. It was later called Hebrew Academy, and both schools amalgamated with Young Israel Synagogues schools in 1965. The Adath Israel has its own cemetery. It also ran an afternoon school and developed a separate Sephardi service (Adat Yisrael Sefaradi). Eventually, due to the shifting Jewish population, the Outremont buildings were sold and the congregation moved to a newly built synagogue in Hampstead in 1980. The Adath Israel had one of the first "contemporary" synagogue designs and was the first large, new synagogue built in the post-Depression era in Montreal.