The first 2 photos are the Shinjuku Mitsui Building.
The last 3 photos were taken at different times and all of the buildings are part of the Tokyo Metropolitan Government (Tokyo City Hall). The buildings are most often referred to as “Tochō” or “Tax Tower”.
The first building is called “Main Building No. 1″. According to Wikipedia, Architect Kenzo Tange designed the building to look like a computer chip. This is the 2nd tallest building in Tokyo (and 7th tallest in Japan) with 48 floors.