The study investigates the principles of input-output analysis to determine the influence of real estate, with specific reference to commercial real estate as an investment class, on the economy in South Africa. The results of the study shows the model developed for this purpose and the results of the direct-, indirect and induced impact of commercial real estate on the economy. The model provides the basis for economic analysis with regards to real estate and provides the opportunity to do international comparisons with regards to the impact of real estate in different economies. This forms the basis for further analysis into a Property Purchase Power Parity index, which attempts to analyse differences in economic behaviour in any country, based on the wealth effects of real estate in that economy.