To estimate the price of the 2012 Lexus LX570 V8 5.7L Signature Exclusive (Mid+), I considered the listed prices of similar cars. The 2011 Lexus LX570 V8 5.7L Signature (Mid) with 281000 km is listed for SAR 123000. The 2012 Lexus LX570 V8 5.7L Signature Black Edition (Top) with 233000 km is listed for SAR 125000. The 2013 Lexus LX570 V8 5.7L Signature (Mid) with 329000 km is listed for SAR 110000. Given that the car in question is a 2012 model with 280000 km and is in average condition, I adjusted the price slightly lower than the 2012 Black Edition and closer to the 2011 model, considering the mileage and condition.