Sometimes an “authentic artist’s loft” is exactly that. That’s the case with this fabulously patina-ed co-op at 139 West 17th Street in Chelsea, which is as much known for vanishing artists’ lofts as it is for art galleries. The $2.75 million listing starts out, “Bring your architect…” The space has as much need for transformation as it has vintage charm. Its current owners, a creative couple with a passion for culture and design, have made it their own, and it could be the perfect canvas for the next owner to do the same. The artist-in-residence has lived here for 40 years–we’re guessing it was converted to a co-op during that time, as this is the first time it has been on the market.