First of all, there is much worse recession now in Iran's real states, and prices falls dramatically, you can now buy a house with 3000 to 4000 $ per meter in most expensive districts, and it seems to be same for three or four years.
Second, Dollar is gaining strengh drasticly, and with cheaper oil, it will be much more expensive. I do not think that buying a house in US would be very bad idea.
About the immigration, yes having property or finantial account helps you a lot, but I do not think that you will be able to apply for residency with F1, maybe you should wait untill the end of you PhD era.
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