Sorry no one answered your original post. What you're looking at is sort of a *weed tree* in the US, where we call it a Box Elder. It even has its own special Bug named after it! Those ratty-looking leaves are standard with this tree. It's a softwood tree, which if it's near your home I suspect you know by now, in three years it would have grown tremendously! Because of this, it's bad for limbs breaking off, with potential to damage your home or whatever else has the misfortune of being under/near it in stormy weather.