To estimate the price of the 2014 Lexus IS250 V6 2.5L Premier (Base) with 181000 km mileage, I considered the listed prices of similar cars. The closest match is a 2014 Lexus IS250 V6 2.5L Premier (Base) with 206000 km listed for SAR 56500. Given that the target car has lower mileage, it should be valued slightly higher. The other listed car, a 2014 Lexus IS250 V6 2.5L F Sport with 199000 km, is listed for SAR 57500, but it is a higher trim. Considering the average condition of the target car, I estimate its market price to be slightly lower than the higher trim but higher than the higher mileage base trim.