It’s hard to believe this customizable penthouse at 481 Greenwich Street has been having a rough time on the market since January 2013. The striking duplex, asking $10.75 million, is the definition of luxury loft living in one of downtown Manhattan’s hottest new neighborhoods, no less. There are quite a few details that set this loft apart from the rest, but we’ll start with the sheer enormity of its size. We’re talking 4,500 square feet of interior space and an additional 3,000 square feet of multi-level rooftop terrace. Add to that floor-to ceiling windows and Hudson River views and you just might find yourself experiencing love at first sight.