OttoMets
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External Elevator shafts are added to older buildings all the time. The Dome also has a bunch of back room service areas that could provide room for shafts internal to the shell too.
This is true. The Dome's only existing elevator was added, as an external addition, after the ADA became law and they wanted to make some accessibility improvements (including two new accessible entrances and the stair-free access from Irving via the new garage and bridge).