1736 hrs: Claymont responded for the fire alarm at the Rite Aid in the F and N shopping center.  E132 arrived and investigated to find that the roof of the Rite Aid had collapsed.  The Engine Officer (Haley) established the Claymont command, and had the engine crew evacuate the ACME, secure the utilities, and called for proper resources.  Crews stood by until the building was condemned by NCCo inspectors.