Newly single billionaire hedge funder Bill Ackman looks to have scored himself yet another unit at the iconic Beresford building on the Upper West Side, where he and his estranged wife already own a unit. The Pershing Square Capital Management founder shelled out $13.5 million, or $4,632 per square foot, for a three-bedroom apartment on a lower floor of the building at 211 Central Park West, according to property records filed with the city Friday. […]