Quick, what do the Baltimore County communities of White Marsh and Lutherville have in common? Well, they are both near the Baltimore Beltway at major interchanges (Interstate 95 for White Marsh and Interstate 83 for Lutherville). They are both classic unincorporated, relatively small suburban communities, and married couples are the leading demographic in each, with most residents living in single-family homes. And they are both dominated by fading centralized commercial centers with noticeable vacancies — White Marsh Mall for one, and the cluster of strip shopping centers around Ridgely and York roads for the other.