Damn, that is one nice McMansion. 
Nah, what I had when I lived in CA was more a "McMansion". Similar interior features, although the house was smaller (1500 sq. ft.) and the lot, if you can believe it, was 65'X48', or a whopping 3120 square feet.
I'm guessing, based on how old BEG said the original house was and where it's located, that the lot size is about 7000 square feet--not huge, but decent by OC standards. At least it takes more than 10 minutes to mow the lawn. The ex's lot is almost 10K square feet, which is damn good sized for that area.
Then again, I'm accused of living in a McMansion now because I don't have at least 5 acres.