Construction crews continue to change the landscape of downtown Cleveland with visible progress on the Medical Mart facility. With steel erection completed, crews have been setting the 515 concrete exterior panels, beginning along the northern side of the future facility and now working on the west side. On the site of the future Convention Center, crews are making visible progress on structural steel erection on the Exhibit Hall roof. Turner Construction reports that three steel tree columns and box trusses were installed this week, upping the total to nine out of 20 massive support structures. With the installation of steel tree columns and box trusses, crews are also hanging steel columns and adding metal decking for the future Convention Center roof and Mall B surface on the center section just north of St. Clair Avenue.