why is tree already losing its leaves

Question

I live in Falls Church, VA. – Mayfair House Apts. – and the sycamore tree in front of my building is losing its leaves. Is it due to so much rain or too much water?

Answer 1

Certainly environmental stresses can cause leaf drop on deciduous trees.
It is likely not a serious issue, just the tree showing it's stress to the heavy rains.
Remove any dropped leaves to help eliminate any fungus issues.

https://www.gardeningknowhow.com/ornamental/trees/sycamore/sycamore-tree-care.htm