The Family Office Exchange in Chicago sits atop America's wealth pyramid. It is the largest and oldest research outfit helping the superrich run their "family offices," private operations that oversee sprawling fortunes. When those offices acquire sufficient know-how, they often defray their costs by selling services to other families, becoming "multifamily offices" with billions under their wings. The Family Office Exchange helps those outfits too. It is a true friend of the well moneyed.

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