My friend rode his bycical here. We both got coffee. I got 3 pancakes at 8"30 am. He rode the lyft to court. He asked the manager if he could leave his bike here. The manager said yes. When my friend got back to Mac Donalds , his tires were slashed.

Then he should talk to the manager

Talk to manager. He may repair or replace the damage. However your friend is liable for leaving his bike. The law will aide with McDonald's unfortunately. Try being friendly and then if it doesn't work let them know you are calling corporate. See if they flinch. Sorry about your friend and your experience.