SEVEN THINGS YOU DIDN'T KNOW ABOUT MELLIE AND DIANE BORSOKOFF1. They live in an unassuming brownstone on the Upper East Side.Supposedly built for a Gilded Age tycoon whose girth had destroyed many chairs and threatened many floorboards, the townhouse has widened doorframes, a largely open floor plan, and floors capable of holding twice as much weight as the neighboring buildings. Which is precisely the reason it was purchased and donated to the Borsokoffs for their use. Any other location would