I ran across an article showcasing several buildings that you can actually sled, ski, and snowboard on (images below). The first image is for a building in Kazakhstan that uses synthetic snow-like material, making it functional year-round. The last one is in Dubai, a city that doesn't exactly get a lot of snow. That one also happens to be fully enclosed.
I love the idea of a building having multiple purposes and could not help but to think about which kind of dual-purpose structures would make sense in San Jose. Most of the roofs in Downtown San Jose are completely underutilized. There is potential for gardens/parks (like Vancouver), swimming pools, and urban farms. What sort of dual-purpose structures do you think would make sense for us?