Anarchitecture Blog published a graphic from where you can see how much surface area one gets for every 50,000€ (about USD $73,400) in various cities in the world. I’m sure that these numbers are just aproximative, because the price depends on many factors. You can see some factors that can influence the price of apartment in 10 Things You Should Know Before Buying an Apartment an article that I’ve wrote a few months ago.
m2 Sq. foot New York 4.1 44.1 Tokyo 6.7 72.1 Sydney 8.9 95.8 Shanghai 21.5 231.4 Berlin 22.6 243.3 Beijing 30.4 327.2 Dubai 59.8 643.7