My next project was to put in a central park for Mitte. My idea was to have a large undeveloped area scattered with YIMBY items surrounded by a ring of mostly residential skyscrapers, in turn surrounded by high-density commercial. I picked the area south of my rail center, extending almost to the river. I put in the zoo to the north, the country club to the south, the main library to the east, and a mayor's statue to the southeast. I then put a number of mostly 3x3 high-density residential as well as some commercial further out.

I didn't get much development so I decided to check for wandering commuters. A lot of commuters were going north to Reinickendorf which didn't have many jobs so I switched to there, upzoned some residential, and added some more farms. When I switched back the residential zone to the west developed very quickly.

These skyscrapers obviously overloaded my transportation network so I started to put in a subway network. My basic idea was to put stations near most of the residential skyscrapers and connect to the rail centers and to commercial zones that were short of workers. While I was starting that the southern zone developed:

The western zone still didn't develop so I switched to another suburb, Heilersdorf, for some more development and bouncing back commuters. Here I did some more substantive upgrading than I had in Reinickendorf:

When I switched back now the Eastern section developed:

With this done I had expanded the subway into a ring, with some extensions to the northwest. Here's the usage from one of the southern skyscraper stations:

Next I plan to do some infill development for Mitte, which has a number of awkward junctions between developed and undeveloped regions.