Acuity Capital Partners picked up a six-story Washington Heights rental building from Crest Realties and Quantum Equities for $ 20.8 million, or $ 314 per square foot, sources told The Real Deal . Crest and Quantum had pulled the 66,240-square-foot elevator building at 440-450 Audubon Avenue out of foreclosure at a 2012 auction in a $ 7.8 million deal.