It isn't surprising it toppled over. Sycamore trees are garbage trees. They have weak wood that can't be used for burning because of the composition of the wood, they can't be used for building anything because the wood is so weak and their root systems are very disruptive to sidewalks, seage systems, basement walls, etc. they really have no use other than to grow and emit oxygen. However, they are also easily knocked over by winds. I say good riddance. I can't think of anything good to say about Sycamores. Just because the seed from which it grew orbited the moon doesn't make any more of a valuable tree.