The George F. Baker, Jr. Complex House, the 1931-built Manhattan residence presently owned by print-and-media mogul Peter Brant, popped up for sale this summer. The five-bed, six-bath Upper East Side...

Turnkey multi-residence mansions constitute the rarest of the rare in Manhattan. When this one turned up for sale for $25 million, publisher and producer Peter Brant set his sights on...