Bizuayehu Tesfaye/Las Vegas Review-Journal Follow Las Vegas Convention and Visitors Authority board of directors on Tuesday unanimously approved spending $6.5 million to prepare a 10-acre site where the Riviera once stood for a $125 million sale. 16, 2016, to make way for the Las Vegas Convention Center. People gather on Sands Avenue to watch the final tower of the Riviera hotel-casino implosion on Tuesday, Aug.