To estimate the price of the 2017 Lexus ES350 3.5L V6 Platinum (Top) with 142803 km mileage, I considered the listed prices of similar cars. The closest match is a 2017 Lexus ES350 3.5L V6 Platinum (Top) with the same mileage listed for AED 62000. Other relevant data points include a 2016 Lexus ES350 3.5L V6 Platinum (Top) with 129100 km listed for AED 85000, and a 2015 Lexus ES350 3.5L V6 Platinum (Top) with 134938 km listed for AED 62000. Given the average condition of the target car, I adjusted the price slightly lower than the listed price of the closest match to account for potential depreciation and condition.