This will automatically unlock these 4 interior in Vice City on you can see peds in these interiors, if you can't takeover all gang territory as you couldn't bypass the crash for gang wars so it will skip it go to Vice City dance party but it will have dance party peds, if also if you don't know how to unlock since there's no hint icon.

If you want to warp into interiors for GTA: Underground, you can warp, if you are tired of driving to any any places and sometimes crashes when flying to the next city?

v2 - More Bullsworth interiors and Locked Vice City interiors Mansion, printworks and dance party.

v3 - Extra few safehouse interiors from Liberty City and Vice City.

Here, press CTRL + Q to access the interior menu.