They have a free parking for visitors so, if you get there early you might get a spot, otherwise, look around for meters or I believe in some cases they will let you park in the grass for what I believe is $20
Parking can be crazy and it's on the street. With the new meters. So if it's busy it'll take a moment to find a place or you may have a good walk from your car to the building.
There is metered parking on the street, but it's free on Sunday.
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