She was spotted entering the apartment block where Hoffman had until recently lived with his partner Mimi O’Donnell and their three young children.
Blanchett gave no comment to waiting photographers, but was reportedly visibly upset.
She was also carrying gifts for the children.
Blanchett and Hoffman first worked together on the 1999 Oscar-nominated movie The Talented Mr Ripley.
The pair evidently maintained a strong relationship, with Blanchett and her husband, Andrew Upton, inviting Hoffman to direct the play True West for the Sydney Theatre Company in 2010.
In a statement, Upton yesterday described how upset he was at news of Hoffman’s death.
“My thoughts are with Philip’s family at this terrible time,” he said. “He was an incredible man. A generous and true spirit. The loss is extraordinary.”