This is the tree at my neighbors house, its the one in the middle.
Flowers in long upright spikes emerging late June and into late July 2-5" long. Females in same inflorescence as the males but at the base. Which is why they are not in the genus Quercus. Flowers resemble that of a Chestnut. Read somewhere that it is actually believed to be a cross between an oak and a chestnut.
Acorn, cup shaggy when young, 1-1.5" long with burry caps and a short thick stalk. Used extensively by native americans. Mature in 18 months.
New name alert: Notholithocarpus densiflorus
An oak because of the acorns and leaves. I cant think of many oaks with really heavy pubescence on the stems and leaf undersides. They also bloom mid July.
406 Simple Ave, along with many other native trees, including Sequoia, Aesculus, Arbutus, Quercus, and shrubs Toyon, Filberts, Arctostaphylos.