We won't create a garage based off the reasons you have provided, one reason being that if we do it for one group, all will suddenly need one for free.
You can pay for the garage to be attached to the group. The price for garages are here.
I'm unsure if the same garage used at LS customs is available for general use. Again, this is something you will have to look into.
But since you don't yet have a group in game, I'll deny this request. Please re request once you have established a group in game and shown the group council you are elegible.