What is this tree?

I have been surveying Nature Preserves in our town (East Hampton, N.Y.) and I have found this tree on two of our preserves. I would love to know what it is.

 

Consider Styrax japonicus

 

Thank you jimmyq-- i believe you got it right.

 

It might be noteworthy that you have found it growing wild there.

 

Yes, I have now found it on three nature preserves and have seen it along the road in another spot. Hope it doesn't prove to be a troublesome invader.