Certain works prohibited

No apartment owner shall do any work which would be prejudicial to the soundness or safety of the property or reduce the value thereof or impair any easement or hereditament or shall add any material structure or excavate any additional basement or cellar, without first obtaining the consent of all other apartment owners. Explanation. - Where there is more than one building in the association, reference to the other apartment owners in this section, is only to the other apartment owners in the concerned building.