Secret Jobs

In each District, there is a building that is grayed out when you start. After you 5-star the district, that building takes on its color, and can be entered. It contains 8 jobs, each similar in cost and reward to one of the jobs in the district. They follow themes, and when you finish them, you get a crate roll. 

They are not always easy to find. At this time, the secret jobs are only available for the first 5 districts. 

Slums - Skulls Screte Hideout. Bottom left of the map, huge haunted house. 

Tracks - Union Station. Center of map, large columns on building. 

Midtown - Casino. Bottom left of map, on the beach.

Meatpack - Sports Arena. Top center, open stadium. 

Downtown - Entertainment District. Top center, near the subway. 

These are a great deal. By the time you reach them, you generally have enough energy to get through them quicker than the districts they are from. They are a great source of 40 SP - 8 jobs, 5 stars each - and a free crate roll besides. You can do these jobs as many times as you like, but you only get one crate roll for each district. 

After you 5* a district, pile up some cash and SP doing the secret jobs. And I hope you get an Epic LT on every roll!