Given the lack of specific data points such as selling prices, offers accepted, and listed prices for similar cars, I will use the depreciation logic based on the new car price. Assuming a new 2014 Mercedes GL450 4.7L V8 SC Standard was priced at approximately 300,000 AED, and considering a 10% depreciation per year over 10 years, the estimated value would be calculated as follows: 300,000 AED * (0.9^10) = 104,652 AED. Adjusting for the average condition and high mileage, I would further reduce the price by approximately 20%, resulting in an estimated value of 83,722 AED.