Final answer:
The local Historic Preservation Office or Landmarks Preservation Commission can prevent the demolition of historic buildings, especially if protected under the National Historic Preservation Act.
Step-by-step explanation:
When it comes to preventing the demolition of historic buildings, city agencies such as the Historic Preservation Office or local Landmarks Preservation Commission often have the authority to intervene. These agencies can designate buildings as historic landmarks, which can protect them from being altered or demolished. In some cases, buildings may also be protected under the National Historic Preservation Act (NHPA), which mandates a review process for any federal undertakings that could affect historic properties. This process includes consultation with state and local preservation officers as well as public involvement. However, if a building is not designated as a historic landmark or if it falls outside of the NHPA's purview, preservation may be more challenging and involve mobilizing public support to persuade city councils or planning commissions to halt demolition plans.