Nevada City’s planning commission unanimously granted a superfluous conditional use permit to Nevada County Thursday to house the district attorney’s offices at the unoccupied former Bank of America building on Commercial Street. “It would be nice, certainly, if retail was there,” said Nevada City Planner Cindy Siegfried. “It’s been a bank forever; it has never supported retail uses,” Siegfried later noted. Even though the county is exempt from city ordinances, such as the one against housing offices on ground-floor space in the historic downtown district, the county sought an exemption as a goodwill gesture between the two government entities and …