The $1 million 10-story Wrenn Wing was added to the Southern Furniture Exposition Building in 1950. The center's fourth expansion is connected to older parts of the building by glass walkways over Wrenn Street. During the 1950s, informal "in-between" markets began to emerge, hosting visitors in April and October. The main markets were still held in January and July. However, the size and scope of the mid-season marketing during April and October begin to surpass the January and July shows in the 1960s.