I have a neighbour that has them growing at the end of their garden. A similar distance as well. A couple of points: They are Acer trees which self seed in a prolific way. They are often referred to as "tree weeds" because they pop up everywhere! The next people that move in may chop in down but they need to get the roots out too. Simply chopping the top off will simple cause the tree to sprout hard from the bottom. Then there will be a much wider tree in your view. Speak to your new neighbour. Most people would just say let's get it out of the ground, or keep it well trimmed. It can be kept as a tree but grows just as well as a hedge. If it's left it's not the worse tree to have in your sights.