You should do some market research and see what’s in demand in your area. For example, in my city, self storage is very in demand. Smaller businesses charge an average of 2-3$/month per square foot for small storage barely big enough to fit a small car, and that’s a good 30 minutes away from the city. If capital is low, you can also consider leasing the space to other business for a monthly fee. If you have the resources, you can start something more complex, like a fulfillment center. If you’re into entertainment, indoor trampoline parks seem like a good business, they’re always packed around here. So many thing you can do with a space like that, just make sure to do your homework.