In 1930 the Indiana Bell building was rotated 90°. Over a month, the 22-million-pound structure was moved 15 inches/hr, all while 600 employees still worked there. There was no interruption to gas, heat, electricity, water, sewage, or the telephone service they provided.
No one inside felt it move.

-The move was because Bell bought the building but needed bigger headquarters. They planned to demolish it but that would've interrupted phone service for a big chunk of Indiana, which they didn’t want to do.
- They lifted the whole building with steam-powered hydraulic lifts, then set it on enormous pine logs. It was moved via hand-operated jacks, which pushed it over the logs 3/8" at a time. Once the building rolled far enough forward, the last log would be moved to the front.
People could still enter/exit the building thanks to an entryway that moved it, which connected to a special curved sidewalk. (seen in the video).
https://www.youtube.com/watch?v=jZqsBODXjPw Source:
https://www.youtube.com/watch?v=jZqsBODXjPw

Amazing!

Quite an interesting fact i know.