The Alameda County district attorney said she will formally announce charges later in the day.
The person says Derick Almena and Max Harris will each be charged with 36 counts of involuntary manslaughter. The source was not authorized to publicly discuss the charges and spoke on condition of anonymity.
Authorities say Almena leased the warehouse and illegally sublet space for artists to live and work. He is also accused of holding for-profit concerts at the warehouse, which was not licensed for entertainment.
More than six months after the fatal blaze, authorities have not disclosed what caused the fire but have said they are investigating electrical causes.
Kyndra Miller and Jeffrey Krasnoff, attorneys who represent Almena, did not immediately return phone messages today. It's not known if Harris is represented by an attorney.
Oakland city records show neighbors, residents and visitors repeatedly complained about the warehouse to city officials, citing safety problems, loud parties and other issues with the dilapidated building that had been illegally converted into living spaces.
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