there are a couple on 3-4th & Washington Avenue just down the street from Walgreens. They charge appx $25-30/ day. I've negotiated the price before. It's about a five block walk from the hotel but I believe the price is cheaper than what you'll pay near the Chesterfield. South Beach is pricey.
Street parking, or a parking garage located nearby on Collins near 8th
Get an answer from Chesterfield Hotel staff and past guests.