I believe you are asking about the "effects" of building demolition so I will proceed accordingly. The main problem in urban settings is the lack of clear space, especially in areas where building bylaws are not strictly followed. The demolition of one building can impact the structural integrity of adjoining building. Due to close proximity to the road, there are chances that the debris may fall on the road and damage it, or worse, fall on a vehicle. To completely safeguard against, the road would have to be closed that would increase traffic on alternative routes and may restrict the access to business in that area. From the environmental point of view, it will cause noise and air pollution which could be unbearable for the residents. Hence, it is important that the local administration ensure the fulfilment of all work zone requirements for such activities.