I am in the process of starting a business and was running into the same problem.
I finally contacted the lady who catered my wedding five years ago and she is going to allow me to rent out space in her commercial kitchen on a per/hour basis. She’s giving me a key with full access to her equipment, walk-ins, etc. I also found another local caterer that was also willing to rent out some space, but it was more expensive so I went with the first option.
You may want to try going the same route or scouring CraigsList.com for something.