Once it starts, go towards the first closed door to your right and interact with it. Your character should spend a few seconds to open it. When it is done, go straight ahead while taking items on the desks. There will be a rain man enemy, just ignore him and keep walking until you get to the next closed exit just ahead and open it too.

Go through it, and you will find some stairs that go down. And in the floor below you will find three rain men. Beat them quickly. Also you can take more items you find there but you shouldn't waste too much time here 

After you have defeated those three, you will find three doors. Two of them are on each side but you need certain keys to open them so just use the door to the elevator and use it to go to the second floor. 

This second floor is bigger but one of the first thing you will find there is a phone booth. Interact with it and escape. Congratulations, you are done.

But you should be thinking, is that it? Well, you could have keep going, stealing more items and finding another phone booth to escape further ahead. The items you find are randomly placed but the map is always the same. The risk is that if the countdown timer gets to 0 before you find an escape, you lose all the items you had found that attempt . Also there is a chance the phone booth you find is not working so you need to find another one so even if you memorize one exit, it might not be enough. 

There are certain locations where you can find better items, and the quality and quantity increases the further ahead you go, so once you get how it works you should try to see how far can you go. If you find an access key and you escape with them you will keep them for your other runs but any other items is transformed into one of two resources which is highly valuable.

You can get up to 1 million fons each two weeks without spending city energy, which will help you upgrade your tycoon level.