According to the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), approximately 41,000 square kilometers, or 20% of privately-owned land in Japan is owned by unidentifiable or missing owners.
A missing owner is defined as someone who has either passed away without the property title being transferred to the heirs, or an owner who has since moved but has not updated their address details on the property title. Generally speaking, there is no legal obligation to update a change of address or inheritance on property titles.
Of the land, 14% is building land, 18.5% is farmland, and 25.7% is forestry. The MLIT reported that 19.8%, or 930,000 hectares, of Japan’s agricultural land has property titles that have not been updated in over 50 years. Some local governments have found property titles showing the owner’s address as Manchukuo - a short-lived pre-war puppet state located in northeastern China.