I faced exactly the same situation after moving into an apartment where there was no space for storing seasonal tires. At first I tried leaving them in a small storage room, but later I learned that improper conditions can slowly damage the rubber. After looking for better options and reading about professional storage solutions, I eventually chose to use the service described on https://drivertires.com/tire-storage/ because it explained clearly how tires are kept in controlled conditions between seasons. It turned out to be much more convenient than trying to store them at home, and since then I’ve actually recommended this option to a few friends who also struggled with tire storage space.