3021 Butterfield Road, Oak Brook, Ill.Luxury retailers in Chicago tend to congregate around posh shopping districts such as the Magnificent Mile and Oak Street on the Gold Coast. But A. Marek—an opulent jewelry boutique located 15 miles from downtown—went against the grain. Owner Barbara Bradford, a staple in Chicago’s philanthropic community, chose to set up shop in the city’s western suburbs, having previously lived in Oak Brook. Her instincts were spot-on. Since opening in 2008, A. Marek has established a reputation that draws clientele from around the city. “It’s amazing how people will take the time to come out and find us,” says store director Romana Malinowski (pictured).Public RelationshipsCustomized with crystal chandeliers and pale ­lavender walls featuring a signature fleur de lis motif, the boutique certainly looks the part of a ­high-end jewel box. The displa