The family-owned chain is celebrating 50 years this month, a milestone not reached by many.
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The first location opened in Lincolnwood in 1971.
It has since grown to hundreds of locations with over 3,500 employees.
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Marc Malnati, son of Lou, discussed the milestone anniversary and shared memories of growing up.
Heart-shaped deep dish pizza celebrates Valentine's Day
For more information about Lou Malnati's 50 anniversary celebrations, head to their website.