A fire destroyed half of a duplex on Sturgeon Bay’s east side on Thursday morning. The Sturgeon Bay Fire Department arrived on the scene after 9 a.m., where they found the home with smoke and flames coming out. Firefighters discovered that the home’s owner was at work at the time of the blaze as they began an interior attack on the flames. Sturgeon Bay Fire Chief Kalin Montevideo said that although they determined the fire's origin to be at the right corner of the home, they could not decipher a cause at this point in the investigation. While one side of the duplex needed smoke to be ventilated out of it, Montevideo added that the other half was now uninhabitable.  The Sturgeon Bay Police Department and Door County Emergency Services also responded to the scene, which was cleared shortly before noon.  Sturgeon Bay Utilities also shut off power for the block while the fire was taking place.