Anybody Know What This Is?

People seem reluctant to comment on this blog. But we have a question. You can be anonymous, when you answer. Or email us at oakavenueresident@gmail.com. Anyway, we took a picture of this U-shaped pipe thing by the fence of the new construction at 2429 Maple. What's it for? [UPDATE: We got close to the fence the next day and saw a tag that said it was a window well. There's even a ladder, so we're thinking it's a very deep window well.] Also notice the little sign with red type on the right -- NO TRESPASSING. Probably because we stand at the fence and shoot pix.