Quebec's corruption inquiry is grilling a construction boss about his relationship with a man who once ran Quebec's most powerful construction union.

Joe Borsellino, head of Garnier Construction, says former FTQ-Construction boss Jocelyn Dupuis was simply a friend and that he was generous towards him.

He tells Quebec's corruption inquiry that he never gave Dupuis money, but often plied him with gifts like hockey tickets, fancy meals and even a trip to Italy with their wives.

He also gave him access to a luxury condominium in an Old Montreal condo building for three years until it was sold in 2010.

The building has made headlines in the last week, being described in reports as a haven for biker gangs and Mafia associates.

The inquiry heard wiretaps of Dupuis and Borsellino discussing a $40 million contract to fix a Rio Tinto plant in Saguenay and whether Dupuis might be able to help him get the winning bid. Garnier did not win the bid.

Borsellino says that, to the best of his knowledge, Dupuis never helped him get any contracts.