This bill, titled the Federal Building Threat Notification Act, directs the Director of the Federal Protective Service (FPS) to establish comprehensive guidance for emergency communication regarding law enforcement-related events in federal buildings. This guidance, developed in coordination with the Secretary of Homeland Security within one year, aims to inform Federal tenants about potential dangers and ensure their safety. The required guidance must include best practices for timely notification of violent threats, such as firearm incidents, other weapons threats, terrorism, or suspicious devices, occurring within or near the building perimeter. It also mandates providing clear instructions for safety practices in response to immediate or heightened risks. Each building's Facility Security Committee's designated official will be responsible for implementing this guidance, with the FPS Director confirming their appointment. Additionally, the FPS Director must ensure that all Federal tenants can adequately respond to such crises and conduct periodic testing to maintain preparedness. A report detailing the implemented best practices and protocols, along with a briefing on support needed for building safety, must be submitted to Congress within one year.