My wife found this leaf beside our mailbox. It looks like a Sycamore and we have several Sycamores on our property, but I'm not sure which tree it came from. That is a 12 inch ruler next to it to give you perspective.
The young man next door to me has a sycamore with huge leaves so I know what you mean. Think they all fall over the fence into my back yard. The one looks in nice condition.