Remove Building Area during Runtime

[TheZ]

Is it possible to remove data from square which holds an info that it is a building?

I mean that building which are created initially and if we will remove it with sledgehammer - this zone will still remain as old building and counts as building.

There is also lighting maps baked into this area and if we are trying to put our own lights there, it will be lightned same as it was before removing these old walls.