I think this a species of Acacia. The flowers are not clearly visible. You may post some close up of the flowers / inflorescence. In fact, I have noticed these trees ( unable to recollect the details) in and around Mountain view ( near Shoreline Lake & boating pond) and also nearby Stanford university campus. At that time these trees were not in flower.
During summer you can also notice Albizzia julibrisma (?) also in this area. On Jul 18, 11:05 am, ranjini kamath <[email protected]> wrote: > Request Common & Botanical ID of this tree.Pics taken March [ profuse > flowering ] - April 2011 in Los Altos,California. > Thank you > Ranjini Kamath > > IMG_8666-ph2.jpg > 136KViewDownload > > IMG_8667-ph2.jpg > 192KViewDownload > > IMG_9210-ph.jpg > 132KViewDownload > > IMG_9211-ph.jpg > 185KViewDownload > > IMG_9212-p.jpg > 98KViewDownload > > IMG_9213-ph3.jpg > 187KViewDownload

