Koll Development Co. is seeking a zoning change to build a high-rise medical building with retail space across the street from Presbyterian Hospital of Dallas. According to filings with the city of Dallas' development services department, Koll wants to build a 12-story, 250,000-square-foot medical office building with parking and ground-floor retail. The zoning request says the building will be used for "general medical and clinical office space and ancillary services such as outpatient surgery and diagnostic imaging centers, medical research, laboratory, and pharmacy space."