Requiring each building in a business area to have its own attached parking is a great way to perpetuate sprawl. Successful walkable business districts either use metered street parking, or intercept cars in parking lots at a stand-off distance away from the shops themselves. This amortizes the parking load among the shops.

If that sounds a lot like a mall, it is, but I'd advocate for also removing the zoning restrictions that segregate residential condos from business (a really stupid decision that many American cities keep perpetuating).