Given the lack of specific data points such as selling prices, offers accepted, or listed prices for similar cars, I will use the new car price and apply depreciation logic. Assuming a new 2020 Alfa Romeo Brera Standard coupe has a price of 540,000 AED, and considering a depreciation rate of 10% per year, the car would depreciate as follows: 2021: 486,000 AED, 2022: 437,400 AED, 2023: 393,660 AED, 2024: 354,294 AED. Given the high mileage (540,000 miles) and average condition, I will further reduce the estimated price by 20% to account for these factors, resulting in an estimated price of approximately 283,435 AED.