To estimate the price of the 2015 Cadillac ATS I4 2.5L Premium Luxury (Mid+), I first looked at the selling price of a similar 2016 Cadillac ATS I4 2.5L Standard (Base) with 25000 km mileage, which sold for SAR 62000 on 2023-10-27. Given that the car in question is a 2015 model with higher mileage (59000 km) and a higher trim (Premium Luxury), I adjusted the price upwards. Next, I considered the listed prices of similar cars. A 2015 Cadillac ATS I4 2.5L Premium Luxury (Mid+) with the same mileage was listed for SAR 67500, and a 2015 Cadillac ATS I4 2.5L Premium Performance (Top) with 85000 km was listed for SAR 65000. Given the car's average condition, I adjusted the price downwards from the listed prices. Finally, I considered the depreciation and market trends to arrive at a fair market price estimate.