I suspect that most bloggers here are US-grown and educated. Well, I am not. So you probably can tell that my English writing is not as fluent. I learn the language myself by watching TV news and reading classic literatures. Hopefully you can understand this long post.
Many people I know, whether they are Korean, Chinese, Taiwanese, Middle eastern or European, don't pay US tax on their foreign source income.
I can give you some examples, but I am not revealing details because I know them through family connections.
1. A Chinese woman with two children, spend about $800,000 on a new Northwood house in 1997. Her husband stays in China running a drug co. Does she report her multi- million dollar income? No, but she can pay 10 million cash for a house in Newport Coast. Her only problem is that she has not found one she likes, so she rents -- at more than $30,000 a month.
2. Two Korean brothers, inherited their parents' company in Korea, decided to move their own family to the US. One came first in 2001, rented in University Park, then bought a house in Northwood. Second brother came in 2004 and decided that it was too expensive to buy already, he assumed his brother's lase and is still renting. Their family business has been booming back home, but they don't report the profits as US income. So how did they rent in Irvine? They signed a year-long lease, paid the one year rant and two months deposit full in advance.
(I can name a few more but the post is getting too long).
So does this have an effect on Irvine housing costs? I don't know. Any Immigrant family with an absentee father is very likely to have unreported foreign source incomes. That is my opinion/observation.
My own family is into real estate investment. Grandparents and parents have been successful doing it. My parents bought houses in Irvine starting 1996. By end of 2000, they stopped, telling me it was getting too expensive to have a good profit. Back home they own far more properties than what they have here in CA. They report their US rental incomes, but they don't report their income out side the US to the US government. Is this legal, I guess awgee can answer that.