The master tenant of the Ghost Ship warehouse was sentenced to 12 years in prison this week, although he is unlikely to spend more time in jail. 50-year-old Derek Almena was on house arrest in Lake County after being released from jail due to COVID-19 concerns. In January, he pleaded guilty to 36 counts of involuntary manslaughter.in relation to the deadly 2016 warehouse fire in Oakland that killed 36 people.