Reasoning that existing buildings will improve naturally over time when they undergo renovations, a task force on building resiliency in New York City, formed after last October's Superstorm Sandy, is recommending building-code changes mostly for new construction and substantial renovations.

"Recommendations are intended to minimize interruptions to building functionality while allowing the market to dictate the need to implement resiliency measures," says the Building Resiliency Task Force in its 42-page report to Mayor Michael R. Bloomberg (R) and City Council Speaker Christine C. Quinn (D).