If memory serves, in the last down cycle the price on attached condos dropped up to ~40%, versus the smaller SFR's (detached condos?) in my area dropped up to ~30%. But I lived in Oak Park/Oak Creek and does not represent Irvine as a whole. I wouldn't classify 2 bed detached condos to be "highly desirable homes" either.
My 1 bed condo in Oak Park (plan 1) dropped from peak of $400k's to I think $240k ish at bottom. But that is a tri-level condo, and again, would not call it "highly desirable" to buyers looking for fewer stairs to climb.