This infrastructure has two functions: accessing sponsorship contracts and hiring an agent who will deal with them.
The level of the Business and Medias determines the maximum level of your agent. The most qualified agent must be attracted enough by your infrastructure to apply.
When you wish to hire or replace an agent, the Business and Medias offers you up to 5 applicants. They change after each tournament.
Building this infrastructure permits you to have only one sponsor at a time. However, as your Business and Medias building gets upgraded, you will unlock a second sponsor slot, and eventually a third.