Ok here’s the plan.

Day one you give all the money to me and I’m gonna give you a challenge.

You’ve got to spend 3 billion in 30 days. You can’t own anything, you can’t destroy the money, you can’t give it away, and it has to be totally secret. If you do that then you get $100 million otherwise if you fail you get $19.

Everyone’s happy problem solved, and I think there might be some wacky hijinks involved

Those squares are switches. Commonly use in Germany for light switches. I’d guess they might be buzzers for an apartment lobby, hence the phone with no number pad.