Among the nation's billionaires, one of the most sought-after pieces of real estate is a former S.S. Kresge five-and-dime that's been converted to offices in Sioux Falls, S.D. A branch of Chicago's Pritzker family rents space in the building on South Phillips Avenue; the Minnesota clan that controls the Radisson Hotels chain has an office down the hall; and Miami and Hong Kong families rent other rooms. Most days, the offices are shut. Even when empty, they provide their tenants with an important asset: a South Dakota address for the trust company that holds their wealth.
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