The U.S. Embassy in Mexico City requires brand-new OEM spare parts for its Building Automation System (BAS) to support preventive and corrective maintenance. Items include controllers, sensors, power supplies, and actuators, with full specifications provided in the upcoming RFQ. Offerors must be registered in SAM.gov at the time of proposal submission to be considered responsive. The location for performance is the New Embassy Compound in Mexico City. No budget amounts or submission timelines are specified in this pre-solicitation notice.