half US income, half foreign income how to buy a house in CA ?
If you have h-1, e-1, or l-1, I can offer you faa 3.5% min down. under 4% 30yr fixed zero points..i can also offer foreign national loan that requires larger down payment

borrowing against manufactured home
I am a direct lender in northern California. You can do an fha 203k rehab/remodel loan. Rates in the mid 4%, and pay zero points, no prepay.

160% LTV on an investment property
Only if your loan was originated before June 1st 2009, and really its the Date Fannie Mae Purchased it. Must be prior to JUne 1st 2009

Can a renter in Los Angeles CA buy a home in Fresno, Ca with less than 20% down. Parents would live there rent free.
Yes, you can with 3.5% down. 30yr fixed rates under 3.26% zero points. Must have 620 min fico and at least one of you must be on the loan with your son.