How do I resque Cassie with out an ending and upgrade the safe house basement
Talk to Arlene (at the police station), she refuses but gives you a hint how to get the police to help you.
Go to the slums, south of the mention is a guy that can help you. He wants 1000 credits, but you should refuse, he goes down to 500, refuse again and accept after that.
Now sleep and go back to Arlene.
I think, you still need all people that can help, but this leads to a different ending in the rescue mission.