The Historic and Design Review Commission (HDRC) gave conceptual approval Wednesday to several design amendments for the historic Witte Building, which is slated to become a mixed-use development and open in 2019…. The updated design features the elevator pushed back about 4.5 feet, said Andrew Douglas, president of Douglas Architects, which is designing the Witte project. The stairwell will land just left of the pedestrian walkway. “We feel it’s a much better improvement (since) it gives a clear path to the River Walk for the public up and down the river,” Douglas said….