A stunning West Village boutique building — the former home of Gilda’s Club NYC — is on the market for $12.5 million, and ready for prime-time transformation into a single-family mansion.  The four-story, 11,332-square-foot property is at 195 W. Houston St. (outside of the historic district) and can be delivered vacant, say listing brokers Brock Emmetsberger and Marshall Dickson of B6 Real Estate Advisors.