Currency instability is the defining risk, and it is severe
The investment threshold is denominated in USD precisely BECAUSE of lira volatility — the Turkish government itself does not trust its own currency to hold the threshold's value. Marketing that cites '15–25% annual property price growth' is quoting LIRA appreciation during a high-inflation period. In USD terms the picture is entirely different. This is the single most important thing to understand about Turkish property investment, and it is the thing most consistently obscured in promotional material.

