You just bought a commercial building that used to be a bookstore and want to operate it as a restaurant and the zone allows restaurants, so you can legally open, right? Not necessarily! Even if the zone allows a use, there must be a building permit or certificate of occupancy that authorizes that use as well. There are practical reasons for this. The restaurant likely requires more parking and there are clear physical differences in how a restaurant is used from a retail store.
Land Use Developers is an ace at processing use permits and changes of use so property owners can be in compliance and businesses can get on with their business sooner rather than later.