Seems to happen often in the city that people will deal with problem trees by cutting off branches they're worried about, and when they run out of chainsaw the rest of the tree gets left standing there. This one is just down the block from my house, and looks like it's been in this condition for at least a couple of years (I'm new in the neighborhood, so I don't know when the butchery occurred). I'm halfway tempted to ask the homeowner whether they'd like some 'help' with it, but I'd like to know what it is first. My best guess is ash, but I'm not much good at identifying trees by their bark. What do you think?