<P>Pioneering observers of the urban landscape Bernard Frieden and Lynne Sagalyn delveinto the inner workings of the exciting new public entrepreneurship and public-private partnershipsthat have revitalized the downtowns of such cities as Boston, San Diego, Seattle, St. Paul, andPasadena.Both authors are in the Department of Urban Studies and Planning at MIT. Bernard J. Friedenrecently completed a term as Chairman of the MIT Faculty and is Ford Professor of Urban Development.Lynne B. Sagalyn is Associate Professor of Planning and Real Estate Development.</P>