They own the Pontiac Silverdome.

Now they've snapped up a downtown Detroit landmark: The Penobscot Building,  Detroit's third tallest officer tower, the Wall Street Journal reports.

The paper reported that the Apostolopoulos family of Toronto bought the Detroit building for a measly $5 million. In its day, it was one of the classiest office buildings in downtown Detroit, filled to the brim with lawyers. 

That bargain-basement price comes down to $5 a square foot, far below the $28 range downtown Detroit buildings were costing last year, the Journal reported. There may be a reason: The office vacancy rate in downtown Detroit 26.5 percent, far above the national average.

The Canadian company bought the Silverdome a few years ago for $583,000.

The vacancy rate of offices in Detroit is 26.5 percent. -- A.L.

Read more: Wall Street Journal