What is the average of return on investment (ROI) in Istanbul-Turkey?

The average of return on investment is highly increasing over time. On average, properties’ prices have raised 15% in the last five years. Considering the future prospects, the ROI might accomplish much higher rates. As Istanbul is known as the economic capital of Turkey, real estate investments there are more profitable than those in other cities. Furthermore, in Istanbul itself, there are some high prestige districts whose property investments are characterized by higher ROI than other districts. For instant, Başakşehir is one of the highest district in terms of ROI which was about 29% in 2016.