From the Trump Tower Penthouse you can travel to a friend's board.

• Outgoing visits are limited to 3 unique friends per day. After that, a pop-up tells you you're out of visits.
• While visiting, tap any of your friend's accumulated cash piles. The cash flutters up to you and you receive 5 dice rolls + 5 Networking Points per tap. Their board does not actually lose money.

Incoming visits are unlimited — only your friend cap (max 40 friends) limits how many people can visit you in a day.

Note: this is different from the Friends square on the main board, which is about doing activities with friends to earn Networking Points (20-minute cooldown per friend).