Sears & Roebuck opened their On The Plaza store in January 1947. In this shot, we see said store decked out for the 1949 holiday season. 
Photo from State Historical Society of Missouri / J.C. Nichols Company Scrapbook


The Helzberg's House of Treasures emporium opened its doors in December 1948. The store occupied the northwest corner of the West 47th & Broadway Streets intersection.
Photo from State Historical Society of Missouri / J.C. Nichols Company Scrapbook


Ladies stroll the shops along West 47th Street in this 1951 photo. Note the S.S. Kresge 5 & 10 store on the right. Although inherently an upscale shopping center, the original PLAZA did include several mid-tier retailers, as well. Over the past 40 years, the complex has been thoroughly gentrified and is now exclusively tenanted by high-end stores and services.
Photo from State Historical Society of Missouri / J.C. Nichols Company Scrapbook