Shortly after midnight on November 18th, Company 59 was dispatched to a report Carbon Monoxide alarm on the 700 Block of Baltimore Pike. Crews found readings over 100PPM inside the building and as a precaution the entire building was evacuated. The issue was isolated and the unit was secured by PECO. Once the building was ventilated the guests were permitted to return. A total of 114 guests and 3 staff members were inside the building at the time of the incident. There were no injuries and all guests were allowed back inside before 2:30am.