Hi Unucla, most of these answers are right you can borrow money her in California without being a citizen I have sold to clients from China that just had a visa.
The down payment is the catch, at least 30% down, but more the better and if you are going to invest you should be putting down more money, Interest will eat up you profits. The big question is where to invest in Los Angeles, right now the market is on fire and investors are paying top dollar for property, we are just about back at 2005-2007 prices in some area's. I would stay away from those area's now and concentrate on where your investment dollar would make you the most money. Contact me if you want my expertise in investing. Thank You Matthew Smith