Don't want to burst your bubble, but many MA's already use similar business arrangements. As for SP's doing the same, this is where it can get tricky. "Doing things legit", doesn't change the fact it's currently illegal to purchase and live on the material benefits from sex work. Meaning who ever has her name on the business license and lease will be considered in charge and risk prosecution for any illegal activities. And obviously, the same goes for visiting clients.
If you're looking for someone to share a location and some expenses, you'll likely find. But to protect yourself, you business partner and clients, better be careful on how and what you'll advertise.