1912The first indoor mall, called the Colonnade or the Colonial, was built in Magnolia.Arts and Culture, Economy and Industry, Location and Setting, Buildings & Architecture, Local Businesses
It was located in the middle of Lexington Avenue and was built by Ann Ryan, who grew formal gardens in the back.
Timeline Cape Ann: Lexington Avenue. https://www.youtube.com/watch?v=XK5onUI-0LI.