Ripped from the headlines! Minnesota's SOUTHDALE CENTER, dedicated in October 1956, is Gruen's most celebrated retail project. It was the nation's -and world's- first fully-enclosed, regional-class shopping mall. Expansions over the years enlarged the original complex exponentially, but also compromised its historical integrity. 
Photo from The Minneapolis Sunday Tribune

So-Cal's TOPANGA PLAZA opened for business during 1964. In November 1993, the complex was acquired by Australia's Westfield. It was branded as a Westfield property in November 1998. The "Topanga Mall" has been expanded several times since its mid-1960s debut.
Photo from Wikipedia / Clotee Allochuku-Albritton 

Sources:

"The Architect As Creator of Environments: Victor Gruen, Visionary Pioneer of Urban Revitalizations" / David J. Azrieli, B.A. / Carlton University School of Architecture / Ottawa, ON / April 1997
Architectural Forum, The Magazine of Building / August 1950 / https://usmodernist.org
https://deliriousla.com / "Locating Victor Gruen" / Alan Loomis / April 2001   
https://imagesofoldhawaii.com
https://www.tshaonline.org / Texas State Historical Association
https://www.gruenassociates.com / Gruen Associates
https://archiveswest.orbiscascade.org / Victor Gruen Papers, 1903-1980
ttps://aiahistoricaldirectory / American Institute of Architects / Directory Biographical Section / 1956
"Victor Gruen" article on Wikipedia

Gruen Malls: