Soyo lived in a luxury apartment building with the exact same layout as Miki Kashiwagi's. However, in the minds of the Japanese, the higher the floor of a luxury apartment, the better. If they were priced explicitly, the market value of Soyo's apartment would likely be three to five times that of Miki Kashiwagi's.
One of the most unreasonable reasons for this was "you can stay further away from light pollution"... though there was probably some truth to it.
Take the twenty-first floor right now, for instance. Even without turning on the lights, Miki Kashiwagi's place was quite bright, illuminated by the financial skyscraper in the distance and the commercial CBD nearby—glare that Soyo found somewhat dazzling.
Chapter 274