Sonny lived on the mall. In a deleted scene, you see him walking in an inside passageway in the mall to his mother's kitchen.
So he prpbably had a residence there with a small kitchen for his family's private use.
I don't understand this. After the call from Sollozzo, he leaves his house and walks across the mall to his father's house and eventually enters his father's office. What's the "inside passageway in the mall to his mother's kitchen"? What's the "small kitchen for his family's private use"?