Also, these businesses don't need walls or public restrooms. If the floor is concrete, CVT, carpet, or whatever they still just roll out some padded mats. No one cares what the ceiling looks like or if the heat works. No remodeling required to get their tenancy started, and none required to replace them with a more lucrative business. Landlords are not afraid to sign up such tenants even if the rent they'll pay is low. A tenant like a dentist or coffee shop requires more complicated improvements, will be charged higher rent, and will signify that the strip mall in question is not dying.