Sir Leonard Tilley Building and Annex is a Canadian federal

Government of Canada

The Government of Canada, formally Her Majesty's Government, is the system whereby the federation of Canada is administered by a common authority; in Canadian English, the term can mean either the collective set of institutions or specifically the Queen-in-Council...

 office building property consisting of two buildings and operated by the Public Works and Government Services Canada

Public Works and Government Services Canada

Public Works and Government Services Canada is the department of the government of Canada with responsibility for the government's internal servicing and administration....

 and located at 719 Heron Road in Ottawa, Ontario, Canada. It was designed by Bemi & Associates Architects in 1987. The floor space covers 23,832 square metres and the land area covers 4.527 hectares. The building includes the Communications Security Establishment

Communications Security Establishment

The Communications Security Establishment Canada is the Canadian government's national cryptologic agency. Administered under the Department of National Defence , it is charged with the duty of keeping track of foreign signals intelligence , and protecting Canadian government electronic...

. This building was named in honour of Samuel Leonard Tilley

Samuel Leonard Tilley

Sir Samuel Leonard Tilley, PC, KCMG was a Canadian politician and one of the Fathers of Confederation. Tilley was descended from United Empire Loyalists on both sides of his family...

, an early federal Finance Minister.