In the latest billionaires’ battle at 740 Park Ave., semiconductor mogul Hamburg Tang, 85, and his wife Miranda, 80, are suing Oaktree Capital king Howard Marks, 70, as well as the co-op board.

A number of the city’s toniest co-op buildings that long welcomed the diplomatic elites of foreign nations are now shifting gears.

A prewar building at 737 Park Ave. is coming to market for the first time in 65 years and could fetch as much as $250 million ... at 720 and 740 Park Ave. ... The second tenant, ...

VENERABLE 740 Park Ave has long been known for its embarrassment of riches. ... The tenant added that 740 residents “have so much, they barely notice.

France is asking $48 million for an 18-room duplex located at 740 Park Avenue, ... Its "who's who" list of tenants, which have included John D. Rockefeller and Marshall Field III, ...

As tax season hits, it's time for the annual chorus of "NYC property taxes make no sense." This year, the theme seems to be how little the city's rich co-op owners pay in property taxes compared to ...

The limestone fortress at 740 Park Avenue has long been the trophy address for titans of finance, American royalty, and heirs to all sorts of gilded thrones. John D. Rockefeller resided in a 37 ...

In the wake of a record-setting sale at 740 Park Avenue, one of New York’s best-known buildings, a five-bedroom duplex apartment is returning to the market for a discounted $27.5 million.

NEW YORK (CBSNewYork)-- A fire broke out Wednesday afternoon on the sixth floor of a prestigious residential building on Park Avenue on the Upper East Side. The fire started around 3 p.m. in the ...