Which architectural feature, first implemented at Southdale Center in Edina, Minnesota (1956), revolutionized shopping mall design and became standard for malls worldwide?

The shopping mall fundamentally changed retail architecture and consumer behavior in the 20th century. This trivia question explores the architectural innovation that launched the concept of the enclosed shopping mall as we know it today - a design decision that would transform commercial spaces worldwide and influence generations of retail architects and designers.

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Fully enclosed, climate-controlled interior space
Multi-level design with central atrium
Anchor stores at opposite ends
Integrated parking structures