The building has
maintained connections with Canada
throughout its history. It was built
as the British headquarters of Canada's Sun
Life Assurance Company. The foundation
stone was laid by
Thomas Bassett Macaulay, of Sun Life
Assurance, on Canada Day in 1927. In
1939 it became the Canadian Military
Headquarters in the UK, which remained the
case until 1947. Between 1940 and 1947
physical connections were established
between it and Canada House next door.
In the years following
WWII the building played a number of roles
for the British government. For a
while it was the Department of Culture,
Media & Sport and more recently the
Serious Fraud Office. The building is
apparently listed but I have been unable to
locate that listing.