K well I can answer both your questions in one answer. It lays within the Hyman Condo. If you have the money to spare of course, Its a good investment IMO. Its just east of the arena.
You get a helipad with your very own maverick, with three different garages: Two that hold two cars, and one that holds four.
If you dont have the money/dont want to buy the Hyman, You can look on top of the police station and the VCN news building on the second island in the downtown area for a helicopter.