How do I get trust so I can renovate the safe houses basement thing
you just finish cassie's quest first
As mentioned, finish Cassie's route! To start it, visit the slums and force pass the toll guy, then sleep and return to the slums!
I did and it ended the game
Speak to Arlene, then visit the hobo area and get their help, before returning to Arlene! You'll need to sleep periodically to move events forward.