It's just one thing after another for Salim Mehajer.

The former Auburn deputy mayor, 31, has been given 21 days to vacate the rental Vaucluse mansion he had been living in before he was put behind bars or pay $18,000 in outstanding rent.

The order was granted at the NSW Civil and Administrative Tribunal on Friday morning after the colourful businessman failed to make the payments on the luxurious property in upmarket MacDonald Street, overlooking Diamond Bay.

Two cars, a Rolls Royce and a BMW, which Mehajer was often seen driving around in, have already been removed from the garage at the home by the owners of the vehicles.