The economic downturn created a supply of vacant and abandoned retail and office space. These gaps in the urban fabric are recognized as socially damaging.  At the same time detrimental effects of urban sprawl and expansion of cities is becoming apparent.  Adaptive reuse is a practical and economically rewarding solution to both problems.  It's time to look at these empty shells as great opportunities for redevelopment.  We believe this is one of the best ways to deliever green architecture.