You may get lucky with metered street parking, otherwise here are a few  parking garages nearby:
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•   Emerald Green Garage, 335 W. 37th St. btwn 8th & 9th Ave
•   ICON Parking, One Pennsylvania Plaza btwn 7th & 8th Ave
•   iPark, 70 W. 38th St. btwn 5th and 6th Ave