Experts have found that many old buildings of cultural and historical merit have been demolished in Tokyo over the past 30 years.
Architects and university researchers studied buildings constructed from the mid-19th to the early 20th century in Tokyo's 23 wards.
They found that three quarters of them had been demolished or redeveloped. The demolished buildings include Japan's first reinforced concrete apartments and the central post office.
One of the architects, Yasumichi Mifune, says it is cheaper to put up new buildings than preserve old ones in Japan, and he is concerned about the loss.