I thought everyone in Irvine only has to pay taxes on their cash-bought houses? Easy!
The conclusions can't be taken as anything more than a relative cost index. I bet a lot of work went into pinpointing those exact #s, which become less meaningful once you start factoring in the conditions unique to the individual. Married? Dependents? Mobile Millenial? Rooted Gen-X? My mother is in one of the $100k plus locations, and she has everything she wants on about $2500/month.