A structure fire on North 7th Avenue in Sturgeon Bay devastated a multi-family dwelling Wednesday morning.  At about 10:30 a.m., the Sturgeon Bay Fire Department responded to a fire at 404 North 7th Avenue with flames and billowing black smoke coming from the upper and lower levels of the complex.  The fire was contained to the building and as of 12:30 p.m. the fire department and police personnel are still at the scene.  Fire Chief Tim Dietman was not available for comment and no other details are available at this time.  Door County Daily News will update this story as more information is released.