There was a little-known sequel to SimTower called Yoot Tower (named after Yoot Saito). It was a commercial flop, but I played it in the 2000s and again in the 2010s and very much enjoyed it! It had a lot of added customizability (more choices of restaurants and shops, for one thing). I would love to see that game recreated.
"Tower Kit" was released, but I haven't been able to find an archive of the executable, just some web pages about it:
https://web.archive.org/web/20000229064305fw_/http://www.ope...
https://web.archive.org/web/20000311043425/http://www.openbo...
https://web.archive.org/web/20000310234154/http://www.openbo...
https://web.archive.org/web/20000521002924fw_/http://www.ope...
There's even a monster movie version of "The Tower II Special Gamera Pack" released with “Gamera 3: Revenge of the Iris”!
https://en.wikipedia.org/wiki/Gamera_3:_Revenge_of_Iris
Here's a summary of Tower Kit:
https://github.com/YootTowerManagement/YootTower/blob/main/R...
>What's Tower Kit?
>Tower Kit is optional software for The Tower II. In The Tower II, you can select the stage where you want to start the game using the concept of a "map." The Tower II package comes with three maps: "Shinjuku Subcenter," "Hawaii Diamond Head," and "Kegon Falls," and the "Tower Kit" adds these maps. By installing this tower kit, a new stage game will begin. Tower kits don't just add more stages. Each map has new features, allowing you to play a completely new game.
>Please try the "Tower Kit" which allows for infinite variations.
>A love story between you, the person in charge of the Liberty Island redevelopment project, and two men and women who are your subordinates. Your work will have a subtle influence on the course of your love life. The Tower II is the first attempt at a crossover between redevelopment and love, set in New York. What is the ending...? [...]