New Braunfels leaders’ efforts to drive more downtown revitalization could get a significant boost as plans to transform one of that city’s Main Plaza buildings have reached a critical juncture. NBU has engaged San Antonio-based Douglas Architects’ Andrew Douglas to help develop an overlay district to ensure the property’s future owner maintains the historical integrity of the structure. Douglas, who has also been involved in the South Castell effort, said what’s in play at the NBU site is a “legacy project.…”