Looking on the internet deeply has found these results:

at the concourse level is the most popular phrase on the web.

at concourse level 123,200 results on the web	at the concourse level 164,600 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
We're trapped on the Concourse level between Towers One and Two. Please use the elevators for direct access to the main level concourse. Concourse lounge "C", fourth level.	I've got two security doors on the northeast side of the concourse But I saw her in the concourse ten minutes ago. So the loser had to run around the concourse at old Yankee stadium, nothing on but a foam finger. Please use the elevators for direct access to the main level concourse. On the walkway, heading towards the concourse, sir. We're trapped on the Concourse level between Towers One and Two. Judging of all the concourse events will begin shortly. He's halfway down the concourse outside international arrivals in a blue cagoule with a holdall.

at concourse level

123,200 results on the web

at the concourse level

164,600 results on the web

More popular!

I've got two security doors on the northeast side of the concourse
But I saw her in the concourse ten minutes ago.
So the loser had to run around the concourse at old Yankee stadium, nothing on but a foam finger.
Please use the elevators for direct access to the main level concourse.
On the walkway, heading towards the concourse, sir.
We're trapped on the Concourse level between Towers One and Two.
Judging of all the concourse events will begin shortly.
He's halfway down the concourse outside international arrivals in a blue cagoule with a holdall.