Who is the Mexican business magnate, investor, and philanthropist that owns the historic building located in downtown Detroit, Michigan built in 1905?
Marquette Building (Detroit): The Marquette Building is a historic building located in downtown Detroit, Michigan. Marquette Building (Detroit):  It was built in 1905, and stands at 243 West Congress Street. Carlos Slim: Carlos Slim Helú (] ; born January 28, 1940) is a Mexican business magnate, investor, and philanthropist.
Carlos Slim