Which architectural retail design innovation, first popularized in the 1950s, revolutionized shopping by bringing multiple brands together under one roof with a central promenade?

Retail spaces have evolved dramatically over the centuries, with architecture playing a pivotal role in how brands present themselves to consumers. From ancient market stalls to contemporary flagship stores, architectural retail design has transformed how we experience shopping. This poll tests your knowledge about a significant architectural retail design innovation that changed how consumers interact with brands in physical spaces.

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The enclosed shopping mall (with Victor Gruen's Southdale Center being the first fully enclosed, climate-controlled shopping center)
The department store atrium (pioneered by Marshall Field's with its massive glass ceiling)
The strip mall concept (with connected storefronts sharing a common parking area)
The flagship store concept (standalone architectural statements like Frank Lloyd Wright's V.C. Morris Gift Shop)