I have a few of these growing around the property. The leaves get huge. I call it the "poor man's elephant ear" tree. Young one This leaf is at least 20" across.
I know basswood and catalpa have huge leaves, but it doesnt look like either IMO. I noticed the black locust leaves...leaf it to me to do so! Another "weed" tree but one we all love.
Thanks for the info. Looks like they're headed to the burn pile. Too bad they're so invasive. I kind of like the look of them