One reason why prices soar is that the fed approximately doubles the amount of money in the economy every 10 years. One question is who gets the new money and how do they use it?
Another big factor is that since people increasingly treat real estates as "savings" (because their cash is constantly losing value due to inflation), you have more and more people dumping all their cash into property and refusing to sell, since it's their piggy bank.
Another great reason to not have a wildly unstable currency....