Okay, So There's This Tree

It is located at the far left end of the back yard and so over the summer I have watched this thing grow. Last year it was a twig.  I sit on my steps listening to the birds, checking out the garden and the tree.... for some reason this year it decided to grow like gangbusters.... now over twenty feet tall with some branches reaching out at least thirty feet I'd guess, thankfully mostly on the neighbor's side.  This is a maple of some kind and really a pretty tree; however, it was starting to shade my yard... particularly the large Hisbiscus growing on the left side of my yard and a smaller evergreen in the extreme back left.

Now I'm fuming because the neighbors don't pay any attention to their yard so probably haven't even noticed their tree.  Now I'm scheming how to reach over the fence and cut off some of the more offensive shading branches when they're not home.  I did in fact over a couple weeks manage to lop off several branches without disrupting the shape, endangering the health of the tree, or being noticed by the neighbors, and I was pretty proud of myself for how stealthy I was at doing it. 

So yesterday I happened to be in the far back left side of the yard transplanting something and while down close to the ground I glanced to the right.... the tree, the damn offender, is growing snug up against the fence, but it's on my side of the fence.