Manhattan’s luxury residential market recorded 21 contracts last week at $4 million and up, according to Olshan Realty’s weekly luxury market report. Rose Associates and World Wide Group’s Billionaires’ Row condominium tower at 252 East 57th Street snagged the week’s top contract. The duplex unit 58/59B had an asking price of $13.87 million. That’s a nearly 7 percent discount off the $14.87 million the home was asking when it hit the market in September 2014. […]