Is parking available for tour guest?

Sure

There is plenty of parking provided for tour guests, in the Rieger's designated parking lot, next to the building

Plenty of parking...

We parked in the parking lot across the street.

There is no set parking set aside for tour guest. There is a lot across the street and also parking along the sides of the building. We had no issue finding some place to park.

Parking lot across the street

Yes