They were ground level, exterior stairs outside
https://www.911memorial.org/survivors-stairs
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Originally Posted by 9/11 Museum Website
The historic Vesey Street stair remnant is placed in the National September 11 Memorial Museum. This artifact, known as the "Survivors' Stairs," remains as an authentic “silent witness” to the events of 9/11.
During the attacks of September 11, 2001, this stairway served as a vital route to safety for many people. The stairs were mostly intact immediately after 9/11, but they were significantly damaged during the nine-month recovery period. The stairway provides a powerful reference to the survivors’ story as well as a commemoration of the recovery period. It is also the sole vestige above ground of the World Trade Center, a major 20th-century architectural complex and engineering achievement.
The stair remnant originally weighed 175 tons and stood 22 feet tall.
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