Given the lack of specific data points such as actual selling prices, offers accepted, or listed prices of similar cars, I will use the new car price and apply depreciation logic. Assuming a new 2021 BMW M850i XDrive V8 4.4L Turbocharged xDrive M Sport (Top++) sedan costs around 500,000 AED, and considering a depreciation rate of 10% per year, the car would depreciate approximately 50,000 AED per year. Since the car is 3 years old, the total depreciation would be 150,000 AED. Therefore, the estimated price would be 500,000 AED - 150,000 AED = 350,000 AED.