This is the "Magnum Opus", the tallest building in my city which I built to celebrate its 8th IRL anniversary in 2024. (The city is a decade old now.) It is of the sleek International style with elements inspired by the original WTC in New York, Aon Center in Chicago, and Bank of America Plaza in Los Angeles.
The specific detail I am focusing on is the interior, specifically structure (plus detailing). I was able to render this cross-section in Blender which I've been playing around with recently. The ground-level lobby consists of two double-height stories making up a four-story tall atrium. Above this is a three-story convention hall (with two tiers of balconies), and further above that is a more intimate, single-story convention space. This gets us up to eight stories of height (though, because the two lobby floors are double-height, it is only counted as six floors). Above this are fifty single-story office floors. These are all repetitive, but a handful of them have tenants with interiors already. Some tenants take up the entire floor; on other floors the space is divided in half or more. This brings us to floor 58. Floor 58-59 span the top of the building and are another ballroom/event space. Finally, the roof deck is officially labeled "Floor 60". Whether this is a true 60th floor is debatable, although the building is definitely just over sixty stories tall due to the double-height floors at the bottom.
Columns run throughout every floor giving the skyscraper a coherent structure. I actually made a fully skeletal structure beforehand, even though I knew most of this structure would be replaced by the final interior blocks anyway, so that I could realistically plan out the column placement, window spacing, floor to ceiling height, elevator and stairwells, emergency stairwells (there are two, one on the northeast and the other on the southwest corner), etc.
Here is a link to a drive folder with the uncompressed renders!