Re: Can't unlock final safehouse
When it happens after the story, technically you can still get the final safe house by buying the access from that specific street racer.
Example if it was Medusa(as an example) that you didn't saved from the rescue mission from that night and her safe house would remain locked, it can still be obtainable. You go to a meet up and have either an S or S+ Tier Car selected in the meet up area. Since each tier has a set of racers in each class like Harlow is only in Tier A+ if your car is that class. Once you switch your car to a S Tier Car, she switches to Medusa. Now after that you select rivals and select Medusa to show her bio and it will reveal Buy their Safehouse on the bottom corner and there you go, you got access to their safe house.
So in short:
1. Goto Meet Up
2. Select Specific Tier Car to display Tier Rivals
3. Select Rivals and select specific Rival
4. Buy their safehouse access.
There you go