This is a very diverse topic and the information related to it has a constantly changing and conflicting nature. This information can be collected by contacting the Delhi Development Authority, Ghaziabaddevelopment Authority and Haryana Development Authority and looking for the list of certified shopping malls/residential societies/metro rails in the NCR.
As a rough estimate, there are about 14 big malls that have come up in the Delhi NCR region in between the years 2006-2013.