Fruit is a flatten samara, about the size of a dime, thin papery with the seed more or less in the middle.
Ulmus parvifolia is commonly confused with this, though several distinct difference are quite obvious. The bark for one, flowering season - this one blooms in spring, and the growth habit - this one is larger, and not as layered as U. parvifolia.
309 and 311 Spreckels Dr.
Nice one at the Cemetery on Ocean Street Extension is in the first picture.