John and Christy Mack put penthouse pied-a-terre on the market for $22.5M

It has recently been reported that John J. Mack, 67-year-old former executive of Morgan Stanley, the American multinational financial services corporation, and his wife Christy, owning her own business herself, Waterfall TALF Opportunity, have just listed their duplex penthouse in a condo building on East 63rd St.

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