Lella specializes in both the design of performing arts spaces and spaces for learning. For La Maison Symphonique, Montreal, Lella was responsible for the design of the building’s concert hall, facades, and public spaces. He was project architect for Toronto’s Four Seasons Centre for the Performing Arts and has worked on theatre projects in Denver and St. Petersburg, Russia. He led The Buddy Holly Hall of Performing Arts and Sciences, Texas, and is currently working on the David Geffen Hall renovation at Lincoln Center, New York City. For the Taylor Institute for Teaching and Learning at the University of Calgary, Lella advanced the architecture of collaborative learning.