My friend has a first floor DDA flat , the ower of the ground floor is a property dealer , he has done extentions more then the original structure of the floor , my friend has recently purchased the first floor .He wants to cover the extended part with grills and barsati for safety purpose , that the ground floor's owner has constructed/extended . The ground floor's owner is not letting him do that. Can my friend cover the open area in front of him ?