The Ministry of Land, Infrastructure, Transport and Tourism (MLIT) estimates that there are 5.9 million condominium apartments across Japan. One in four people in Tokyo live in a condominium, while approximately 20% of residents in Osaka and Kyoto live in one. Of these apartments, 1.06 million are in buildings that were built to the older earthquake codes (kyu-taishin). The current codes (shin-taishin) were introduced in 1981. Over the next 10 years, the number of apartments over 40 years old is expected to quadruple, creating an overwhelming number of ageing and deteriorating buildings. Yet, there have only been 180 cases of reconstruction to date.
One residential building currently facing an uncertain future is Toa Parkside Castle in Tokyo's Ota-ku. Located in a commercial district just two minutes from Omori Station, the 14 storey kyu-taishin building was completed in 1971, making it 42 years old. There are 94 apartments and a total floor area of 6,360 sqm.