The limo automatically spawns around the Mayor's House once you construct it, and will not appear elsewhere in the city. As with other vehicles in the game, it can be used to complete both good and bad UDI missions, which affect your Mayor Rating positively or negatively, accordingly. Since the only way to obtain a Mayor's Limo is through the mansion, it is not available to the player until their city reaches a population of 500 sims. This, however, can be skipped with the use of external cheats found in some sites.