TOKYO  How old does a building have to be before we appreciate its value? And when does its cultural importance trump practical considerations?

Those are the questions that instantly come to mind over the likely destruction of Kisho Kurokawa’s historic Nakagin Capsule Tower.

A rare built example of Japanese Metabolism, a movement whose fantastic urban visions became emblems of the country’s postwar cultural resurgence, the 1972 Capsule Tower is in a decrepit state. Its residents, tired of living in squalid, cramped conditions, voted two years ago to demolish it and are now searching for a developer to replace it with a bigger, more modern tower. That the building is still standing has more to do with the current financial malaise than with an understanding of its historical worth.

Image Composed of 140 pods, the Nakagin Capsule Tower in Tokyo has fallen into disrepair, with leaks and maintenance problems. Credit... Jim O’Connell for The New York Times

Yet for many of us who believe that the way we treat our cultural patrimony is a fair measure of how enlightened we are as a society, the building’s demolition would be a bitter loss. The Capsule Tower is not only gorgeous architecture; like all great buildings, it is the crystallization of a far-reaching cultural ideal. Its existence also stands as a powerful reminder of paths not taken, of the possibility of worlds shaped by different sets of values.