With all my Lescaze research over the last couple of months, I've only just registered that William Lescaze's house at 32 E74th St, aka the Kramer House, is currently for sale for $14 million (the NY Observer asked "Is it worth it?"). Similar to his own midtown townhouse, the Kramer House was built by Lescaze in 1934-35, for friends, Raymond and Mildred Kramer, and is approximately 6,800 square feet. This was the townhouse restored a few years ago by Laura Day. Some images and a plan of the townhouse below, but see also images of the original interiors here and here.
William Lescaze, Kramer House, plan