Duke mansion vanishes from market

The $50 million Duke Semans mansion has been taken off the market after only having been on the market for a few weeks. The 20,000-square-foot mansion, considered by some to be the most luxurious Fifth Avenue townhouse still under private ownership, will be relisted shortly, according to broker Paula Del Nunzio of Brown Harris Stevens, which along with The Corcoran Group, listed the mansion. more [Post]