Mileage on used Lexus. 1st car.

Hi, i'm looking buying a 1993 lexus ls400. It's going to be my first car and it's at a good price right now. Only problem is, it has 273,000 miles on it. Is this too much of a gamble considering the transmission might need to be replaced? I know lexuses are supposed to be reliable and all but do you think I could get a year or two use out of this car if maintained well? Thanks