Why are the walls of buildings made of copper and wire?

Answer 1

If there is such a building, perhaps they are trying to block electomagnetic emissions.

Answer 2

Faraday cage...used in supersecret gov't buildings and rooms to prevent electronic eavesdropping and to mitigate efects of EMP from nuclear explosions. Some labs use them also.
http://en.wikipedia.org/wiki/Faraday_cage

Answer 3

Must be an expensive building....