If the reservation doesn't list a washer/dryer combo, then you'll be in the Terrace building. It's the only building with units that don't have washer/dryer combo's. Otherwise, the two times we've been to the Ridge on I.I. exchanges we've been in the Plaza building.
It seems to me from the exchange opportunities I've seen online at Interval, most of the units made available from The Ridge have been in the Terrace building. But, I've been looking with a relatively low value week. The two times we've been in the Plaza building we exchanged a higher value week.
If you click the photo it will take you to our most recent photo album from The Ridge.