I'm not a graffiti artist, nor have I ever been that much into it. No emotions concerning the matter at all, really. However, a friend of mine, Jared Coffin, clued me into this rooftop. It's called Mes' roof. Mes is an old graffiti tag for Boston and this is his roof. His tags on this roof have not been painted over. They're fading and surrounded by newer, brighter tags, but they persist. The building is being condo-ized, so I don't know how much longer Mes' roof will remain his. Here it is for posterity.