The best thing to do is download park whiz app cheaper than parking garage prices and gives you best locations
I also think park whiz is your best option! On a recent visit, I used a QuikPark garage located on 55th just a few minutes walk from Radio City (and very close to the famous LOVE sculpture as well).
Don't know since we were at a hotel just a few blocks away and walked.
Take the subway
I really don't know
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