Very interesting to see a mature specimen of this one. As others have commented, here in Portugal it is also frequently seen as a street tree but usually quite recently planted (within the last 20-30 years, I would say). We have many in the garden, and it is a good all-rounder; pleasant light shade and flowers, though they do make a mess, as do the leaves when they fall. Has a funny pattern of leaf-drop and leaf out, defoliating around March, messily, but in full leaf again sometime in May. Ours have been flowering for a couple of weeks now.
Regarding propagation by seed, they do sprout here unbidden. We had almost a plague of them in a patch of mulch made from the cut branches after they were pollarded last time, which is the usual maintenance routine here. This seems an extreme case though, after high rainfall and with the perfect drainage of the mulch; in the garden proper we do not see nearly so many.