It is very big and I kind of wonder if that is meant to be V's sign of success and that he and Jackie are making some serious bank on their way up the ladder.
Mind you, Jackie literally lives with his mom in her garage so dude has some problems.
I don't think Rent is that high. Barry (the cop) can afford one even though he is not working. Living in a Megabuilding is one step above being homeless.
And no. Jackie doesn't live with his mom in HER garage. He lives in her house, but has a garage with a small "living room" on the side.