There is a parking structure to west of the garden walk, with access off of Katella and the side street, just to west
Cherie Weller provided a great answer.
On the structure on the west side by catella
In there parking
if you are staying in the area I would just walk
There's a parking structure attached to the Garden Walk. House of Blues is on the top floor, so if you can find parking up there, it'll be an easy walk to the venue. Each location validates for different amounts of time, and I believe House of Blues validates for 3 hours. Anytime past the validation is $3 per hour, and you can pay with cash or credit card.
There is a parking structure there for House of Blues.
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