This bill, the Federal Facilities Protection and Oversight Act of 2025 , establishes new requirements for the demolition or substantial alteration of public buildings in the District of Columbia, mandating express Congressional approval for such actions. Any demolition must also be accompanied by an approved and finalized construction plan for the site. The legislation defines "substantial alteration" to include changes affecting structural integrity, historical character, or exceeding specific statutory thresholds. Furthermore, it expands the oversight duties of the National Capital Planning Commission (NCPC) to encompass substantial alterations and requires consideration of architectural integrity in its review of proposed developments, enhancing protection for federal facilities.