China has the largest number of buildings built by the Japanese.

You mean Shenyang? Before Shenyang, especially in Heping District, there were indeed many Japanese-style houses. Now, the Shenyang Municipal Government Building, Shenyang Public Security Bureau and Hongqi Square are all surrounded by Japanese-style buildings. Japanese architecture can hardly be seen in other parts of Shenyang.

As for whether it should be dismantled, I don't think it can be dismantled casually. Now Shenyang has been tearing down some worthless buildings during the Japanese colonial rule, but some buildings cannot be torn down, some are government buildings, and some are buildings of other companies, such as banks. On the other hand, I think the Japanese architecture in Shenyang and the European and American architecture on the Bund in Shanghai are all symbols of imperialism and colonialism. But European and American architecture in Shanghai has now become a landscape in Shanghai. I think the same is true of Japanese architecture in Shenyang. Shenyang municipal government will keep them.