First, it was not damaged by air raids during World War II.
Second, many university buildings have been declared National Treasures of Japan as they are examples of historic architectural design.
[1][2] The Hongo campus has many historic buildings including Yasuda Auditorium, the first registered tangible cultural heritage property in Tokyo.
Other examples of registered cultural heritage sites are the Main Gate, including the porter's lodge; buildings 1, 2 and 3 of the Faculty of Law & Letters; the building housing the Faculty of Engineering (Reppin-kan); and building 1 of the Faculty of Engineering.
One of the most notable examples of this style is the Faculty of Medicine Building 3, the administration building for Medicine; however, there are many other Uchida Gothics on campus.