There's a ramp next to the building (Midtown Ramp, enter from 4th or 5th), surface lots across the street (2), or city ramps B and C, 2 blocks away.
6 floor parking ramp between lumber exchange and Xcel Energy building. Same block. Hope that helps.
There's a parking ramp on the left side of the building if your looking at it. It's also a hotel parking.
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