The island is threatened by a recent surge of development that is generally incompatible with the historic character of the Landmark. Strong economic success has led to significant changes in community values. Many historic houses have become seasonal residences, reducing the commercial district's year-round vitality. Intensive development of historic gardens, maximization of floor area ratios, and loss of historic interiors are concerns. Politicization of what once were the community's aesthetic values is eroding the quality of architectural design and affects preservation decisions. Huge seasonal transportation increases threaten quality of life and character of place. This development is the reason that the National Trust for Historic Preservation placed Nantucket on its 2000 list of "America's 11 Most Endangered Historic Places", noting that while "Nantucket has a long history of commitment to preservation, an upsurge in the destructive practices of "teardowns" and "gut rehabs," along with the inappropriate sizing and siting of new homes, are dramatically altering the heritage, cultural landscape, and quality of community life on the island."