Brentwood is great, and you may be able to purchase a great home for a reasonable amount of money, however, the commute from Brentwood to Alameda is going to be very challenging. (I'm thinking that you will be driving?)
I listen to the radio every morning starting about 5:30 am (old habits die hard, I had to depend on traffic condition reports for about 20 years of my life). The commute that you are planning is grueling. CA 4 seems always to be in trouble. Once you get past that, you have to contend with the the 680 merge and then with the Coldecott tunnel (CA 24). The Coldecott is a tunnell that on high traffic times switches lanes -- 4 bores vs 2.bores. Having said that, it does not seem to improve the traffic flow during peak times. Without minor accidents that route is awful both coming and going. (I seem to go back and forth from Concord and Alameda at non-peak times and it still backs up.)
By the way, Mapquest says that from Brentwood to Alameda its 53 miles and apprx 59 minutes communte time. Oh, How i Wish I Could Believe This. Perhaps in an alternate universe.
What are your circumstances? is there any way that you can live in a more modest home for a couple of years and still get the advantage of good schools, and save yourself from hours and hours of being on the road home -- or being stressed because you are caught in traffic and are late for work?
Have you looked at communities closer to Alameda? Do you need any assistance in checking out other communities?
Having had looong commutes in my previous life, I fervently hope to dissuade others from spending so much time in a car, getting intimate with all the ruts and bumps on the road, and "tricking myself into thinking that i could leave home at 5:30 in the morning, get home at 8:30 at night so that I could avoid the peak traffic times". Yes, I avoided a lot of the traffic, but I also lost out on a lot of family time.