1) Type of climbing 
Buildering (also known as edificeering, urban climbing, structuring, or stegophily) describes the act of climbing on the outside of buildings and other artificial structures. The word `buildering` is a portmanteau, combining the word building with the climbing term bouldering. If done without ropes or protection far off the ground, buildering ma.....
Bouldering on buildings. It’s the combination of the words bouldering and building.
Using rock-climbing techniques to scale a building; a play on ‘bouldering’.