One such property visited by city officials was built more than 50 years ago and has stood vacant for over two decades. "Considering its age, it is a clean property that has been maintained quite well," said Naoki Yuda, head of a division in the city's urban development department. However, the city has been unable to contact the heirs to the property. Yuda said it is difficult for local authorities to intervene on their own when owners or heirs still legally exist.