Penthouses in the Cary Tamarkin-designed 456 West 19th Street are no strangers to ambitious flip attempts. The most recent one is courtesy of Code and Theory founder Brandon Ralph (not to be confused with Theory founder Andrew Rosen, who just flipped his condo.) Ralph bought his wavy-terraced, High Line-facing, 3BR, 3.5BA penthouse for $6,773,908 in 2011 and has already put it back on the market for $11,750,000. Is the 73 percent return on investment wishful thinking? In all likelihood, yes—the last 456 West 19th Street penthouse that tried for a quick flip is still on the market two years later.