portion with its four- and five-story neighbors, it seems more like an institution than a house. This is perhaps not surprising—until 1989 it was the Birch Wathen private school. Now it is said to be Manhattan’s largest private residence. Inside, amid the flurry of menservants attired in sober black suits and

portion with its four- and five-story neighbors, it seems more like an institution than a house. This is perhaps not surprising—until 1989 it was the Birch Wathen private school. Now it is said to be Manhattan’s largest private residence. Inside, amid the flurry of menservants attired in sober black suits and