List of tallest structures in Tokyo
Timeline of tallest buildings

Name
Years as tallest
Height m (ft)
Floors
Ward
Notes
Ryōunkaku
1890–1923
69 (225)
12
Taitō
-
Old Marunouchi Building
1923–1936
33 (109)
8
Chiyoda
-
National Diet Building
1936–1964
65 (215)
9
Chiyoda
-
Hotel New Otani Tokyo
1964–1968
72 (237)
17
Chiyoda
-
Kasumigaseki Building
1968–1970
156 (512)
36
Chiyoda
-
World Trade Center Building
1970–1971
163 (533)
40
Minato
-
Keio Plaza Hotel North Tower
1971–1974
180 (589)
47
Shinjuku
-
Shinjuku Sumitomo Building
1974–1974
210 (690)
52
Shinjuku
-
Shinjuku Mitsui Building
1974–1978
225 (738)
55
Shinjuku
-
Sunshine 60
1978–1991
240 (787)
60
Toshima
-
Tokyo Metropolitan Government Building No. 1
1991–2007
243 (799)
48
Shinjuku
-
Midtown Tower
2007–2014
248 (813)
54
Minato
-
Toranomon Hills
2014–present
256 (838)
52
Minato
-

Question: What is the change of the tallest building in 1974?
Answer: The Keio Plaza Hotel tower was the tallest building until 1974, when it was surpassed by the Shinjuku Sumitomo Building.