From this part of the description I get the feeling that it wouldn't be a solid block of interior levels but would likely have some sort of atrium space that is

From this part of the description I get the feeling that it wouldn't be a solid block of interior levels but would likely have some sort of atrium space that is spanned by bridges >Inside-that is, below the moon crater’s three-and-a-half-mile-eircumferenced, surface-terraced mountain mass-are all the communal services not requiring daylight: for instance, all the multilevel circumferential trolleyways, interlevel ramps, roadways, and parking lots, with numerous radial crosswalks and local elevators. There are radial crosswalk bridges at every four terrace levels. These provide bridges-never more than two decks up or down-for walking homeward, outwardly from the interior community bowl, to one’s individual, terraced, tree-hidden dwelling area. So it would probably look more like any of the countless building atriums currently in existence, see https://www.google.com/search?q=building+atrium https://www.google.com/search?q=building+atrium he also describes the crater structure as being an A-frame so I think that lends credence my supposition. You could certainly have filled in sections where needed to provide office or retail space. It would actually be quite practical to partition the interior space at regular intervals with a wall consisting of offices facing in to the atrium space behind which you could place retail and a main thoroughfare spanning from the inner to outer parts of the A.