The stadium complex holds the stadium and the buildings around it. You have:
- The stadium (and turf)
- Parking and public transportation
- Training facilities
- Medical department
- Club offices
- Youth facilities
- The fair
- Merchandising (factory and fan shop)
As you can see, each construction site has a specific function. For example, the medical department construction site holds all buildings that have to do with the well-being of your players. The first building allows you to hire a physical therapist, with every expansion additional features are added.
A successful team needs a good infrastructure too, good training facilities, a big stadium, a well organised office...
Buildings deteriorate over time, so you have to always have an eye on your stadium complex.