I normally just drive up the footpath and use the next available driveway exit if I can't get out of the one i'm in.
So long as your car is at a legal height the driveway must be able to accomodate you so as Shell said, check with the body corporate and then get the concreting done, and if you are willign to pay they shouldn't have a problem accept that there will be no access for 3 days but its for a good cause (skyline) so they should understand.