OPP is investigating a structure fire at the Port of Orillia building on Centennial Drive. Just after 4:30 this morning, police got a call about a structure fire at the offices of the Port of Orillia.  When officers arrived, the Orillia Fire Department was there and the building was fully engulfed in flames. The fire was extinguished by 6:30 this morning, but unfortunately the building was destroyed. The OPP and Ontario Fire Marshall are still investigating.