Popular San Antonio staple Rosario’s unveiled plans for a new home for its Southtown on St. Mary’s St. Rosario’s confirmed Friday that it plans to move its King William location to 722 S St. Mary’s St., the former home of El Mirador, which Rosario’s owner and restaurateur Lisa Wong purchased in in 2018. Wong plans to demolish the El Mirador building if approved by the Historic Design and Review Commission next week. Once demolished, renderings from San Antonio-based Douglas Architects, whom Wong has worked with on the designs since 2019, according to a news release…