How is the noise level from the interstate? The holiday inn a few blocks closer in had terrible noise from I-5 at all hours of the night.

Zero noise from interstate

We stayed on the 9th floor. It was extremely quiet. Slept like a baby. Our room faced the street below. And I could see the freeway in the distance, but couldn't hear it at all.

Depends on what side of the hotel your room is. Generally you won't hear it unless you're listening for it. If you end up on the side facing the event center, you won't hear it at all.

I didn't notice any unreasonable noise in the rooms. It is definitely in the city, so there is street noise, but there is nothing unreasonable coming from the interstate.