Two nights ago I was walking down East 48th Street to meet a friend for dinner and drinks when I caught a glimpse of a modern townhouse across the street. I right away recognized it as the William Lescaze House and Office. It happens to be for sale or rent (I am still not sure which) and from what I could glean from the internet the price is a hefty $14 Million or $17,000/month. The house was landmarked by NY LPC way back in 1976 and there much written about since so I will just refer you to them.
William Lescaze House and Office