The 5 storey Dominion Public Building was built between 1926 to 1935 for the government of Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 and is across the street from Union Station (Toronto)

Union Station (Toronto)

Union Station is the major inter-city rail station and a major commuter rail hub in Toronto, located on Front Street West and occupying the south side of the block bounded by Bay Street and York Street in the central business district. The station building is owned by the City of Toronto, while the...

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The Beaux-Arts building was built by architects Thomas W. Fuller

Thomas W. Fuller

Thomas William Fuller , the son of Thomas Fuller, was a Canadian architect. He served as Chief Dominion Architect from 1927 to 1936, designing a number of prominent public buildings in Canada....

 and James H. Craig and originally served as Toronto's federal customs clearing house. It remains a federal property, currently housing a number of administrative and support functions for Canada Revenue Agency

Canada Revenue Agency

The Canada Revenue Agency is a federal agency that administers tax laws for the Government of Canada and for most provinces and territories, international trade legislation, and various social and economic benefit and incentive programs delivered through the tax system...

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The building north facade is curved to match the flow of Front Street east of Bay Street. To the south is the Union Station Bus Terminal, formerly the site of the CP Express and Freight Building (replaced the old Grand Trunk Freight Shed after 1904).
Prior to 1920s, the site was occuppied by a series wholesale warehouses along Front from Bay to just west of Yonge. These buildings were destroyed by the Great Toronto Fire of 1904. To the east the City's 7th Customs House (built in 1876 on the site of the 6th Customs House) and the annex Customs Examination Warehouse occuppied the east side facing Yonge Street.

By 1919 the old Customs House was demolished and the stretch along Front laid vacant.

Other Dominion Public Buildings

Halifax also has a building named Dominion Public Building

Dominion Public Building (Halifax)

The Dominion Public Building is an art deco-style office building located in Halifax, Nova Scotia. Completed in 1936, it originally served as the central post office for the City of Halifax and contained various other government offices....

 completed in 1936. (See List of old Canadian buildings.) Hamilton had a "Dominion Public Building" too, built in 1935-36, which is now the John Sopinka

John Sopinka

John Sopinka, QC was a Canadian lawyer and puisne justice on the Supreme Court of Canada, the first Ukrainian-Canadian appointed to the high court....

Courthouse.