You'll have to check the map.

Probably not. Restrooms are rarely placed in transitional zones like “after the elevator but before the walkway.” That space is usually just a corridor or lobby. If you’re in a convention center, airport, or office building, the restrooms are usually near the elevator banks on each floor, not in the walkway itself. Look for signage right when you step off the elevator.

If you’re asking about a specific building, I can’t tell you without knowing which one. But general rule: if you see a restroom in the lobby area, use it before heading onto the walkway. Walkways (skybridges, tunnels) almost never have facilities.

Plan ahead or ask a local.