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My sister owns a business in the Phoenix area (Ahwatukee) with a commercial kitchen. She'd like to rent it out in their off hours. If you have suggestions beyond Craig's List for how to advertise that opportunity we'd love the input. Cheers!
A good cook is like a sorceress who dispenses happiness. – Elsa Schiaparelli, 1890-1973, Italian Designer
You might want to try the culinary schools. I know when I was in school and I had a project to do it would have been way easier to get some buddies together and rent a kitchen for a couple of hours rather than try and do it in my tiny appartment. Maybe also talk to someone at a restaurant supply store. They may know of people trying to do recipe testing for yet to open restaurants.