The Macerich Company, who had owned the RIMROCK property since late 1996, sold the complex in mid-2013. The new proprietor was Connecticut's Starwood Retail Partners. In 2015, they gave the Main Entrance a face lift.
Photo from https://starwoodretail.com / Starwood Retail Partners

In this snapshot, we have a contemporary view of the mall's North Court. Storefronts for Christopher & Banks and Maurices may also be seen.
Photo from https://alchetron.com / The Free Social Encyclopedia

The Wynnsong 10 megaplex showed its first features in May 1999. The venue, which was the third movie house to operate in -or around- the mall, was rebranded, as the AMC Classic Billings 10, in March 2017.
Photo from https://alchetron.com / The Free Social Encyclopedia

Lastly, a circa-2017 layout of RIMROCK MALL. This depiction, which includes an H & M store that opened in April 2016, also shows the mall's "new" Herberger's, which was dedicated in November 2015. This store would be shuttered in August 2018.