There are lots of people with big influences that need help in each of the locations. They can also highly repay you for your help.
You can meet three Corrupted Officials in town. Pay a visit to every single one of them and you will not regret it.
Head to the first one, he's near the airport . Leon Brinker is standing by a wall - you'll definitely find him .
Talk to him  and accept to steal some documents (you need to have a safecracker). The safe is at one of the places you have taken over, near SaniCo Incineration. Go there a park in such a way that you will be able to leave quickly in a while. Enter through the front door .
Run upstairs and send your safe cracker to the safe . After getting the documents run to the car as fast as you can. There's going t be lots of police everywhere. Drive  to your safehouse where the pursuit will end. You will get one Rapid Recovery.
It's time for the second one; he's close to your safehouse. Speak with Victor Grosser . He's interested in sabotaging a bank. Drive to the target and send your demolitions man to the installation nearby . Run away right after plating the explosives. In case of problems with the police, go to your safehouse. In return you will be able to rapidly rebuild your Business if it will get destroyed.
Your last customer  is a policeman, Ken Jameson, who you will find in the centre of town, behind the police station .
Speak to him  and he will order you to slightly destroy the nearby store. Even though Appaliance King is yours, destroy some of the goods , until you get an appropriate message. This time it's the ability to call off police. You have completed every additional mission in New York.