22 Bungalow (http://www.redfin.com/CA/Irvine/22-Bungalow-92620/home/5950549) next door sold for more ($760K) in October and it was smaller (2418 sq. ft vs. 2700 sq. ft).
One less bedroom and smaller lot by 2000 sq. ft. I believe you could still hear some road noise from 22 Bungalow also.