Along with Spaceflight Now's article Axiom wins NASA approval to attach commercial habitat to space station there's a file image of a hypothetical space station from Axiom.
The bottom is reminiscent of the ISS with cylindrical modules connected end-to-end along with a T-section and a big cupola window on the nadir side, but there's this tall "tower" pointing zenith with a big solar panel array on top that I'm guessing gimbals to track the Sun.
Is there any information about this tall tower section; it's necessity or functionality? Can it help stabilize attitude via the gravity gradient for example?
While the image is labeled as an Artist’s concept, presumably the artist was working in coordination with Axiom engineers. Nonetheless some educated speculation may be necessary to answer this question.
Artist’s concept of Axiom’s space station, which the company says will be constructed while attached to the International Space Station, then detach to form an independent commercial research complex. Credit: Axiom Space