On this playthrough I've decided to just wander around Watson a bit before the heist and keep finding streets I've never seen before, even on previous playthroughs where I walked everywhere. This particular street is practically subteranian and its a shame most of the content takes place at surface level or in the main streets when there are great environments like this hidden around the place where most players will never see them.
That's right! Note that despite the fact that these streets are niche and not used in the storyline - the game developers did not omit them when decorating the map.
There are still a lot of streets and alley without names. I also wish the name were visible on the map.