EE STATED THAT HE ENTERED THE OFFICE BLDG AND A FEW MINUTES LATER AS HE WAS LEAVING THE BLDG SLIPPED AND FELL ON THE LANDING AREA. THE AREA CONSISTS OF A LEVEL CONCRETE FLOOR COVERED BY A ROOF . THE EE WORKED UNTIL 1-28-04 AND LEFT ON FAMILYMEDICAL LEAVE FOR AN UNRELATED ILLNESS RX ONLY.