Virginia Smith at the Wall Street Journal reports a 740 Park duplex has come on the market at $26 million. The C-line apartment, on the 10th and 11th floors, appears to be the one owned since 1994 by Hamburg Tang, a semiconductor tycoon, and his wife Miranda. In 2016, Tang, then 85, sued neighbor Howard Marks, a billionaire financier, over his renovation-from-Hell above the Tangs in the building. Tang won that case. Now, he could cash out for a bundle. And maybe, Marks will have a renovation below him. A payday and a payback.