Construction on the new building is expected to be completed in 2029. Dr. Dre and Kendrick Lamar pose in the press room at the 31st Annual Rock And Roll Hall Of Fame Induction Ceremony at Barclays Center on April 8, 2016, in New York City. Mike Coppola/Getty Images Trending on Billboard Kendrick Lamar and Dr. Dre have served up a piece of Compton to the masses, but the pair of California rap dignitaries returned to their alma mater for a groundbreaking ceremony on Thursday (May 7). Explore See latest videos, charts and news Will.i.am also joined Dre and K. Dot for the ceremony at Compton’s Centennial High School. Dr. Dre stepped to the podium and delivered a brief speech about the importance of “investing forward” to help the next generation. “Today is really nostalgic for me. Sometimes you hear that term ‘full circle.’ This is really a full-circle moment for me because I did actually attend this high school. Well, sometimes I attended,” he quipped. “I was enrolled, I was here, sometimes.…