5A class office buildings is overall stationed by the Chieh Shou Tang Charity and becomes the headquarters of Krai Sith, equipped with the 5A system of which comprises office automation, building automation, communication automation, fire automation and security automation—written International 5A Intelligent Standards, and establish a new benchmark for office sector in Bangkok.
- OA (office automation)：Property management systems, information dissemination systems, background music systems
- BA (building automation)：Central air conditioning, public lighting, building automation management systems
- CA (communication automation)：Cabling, broadband Internet, mobile phones, building coverage system, cable television and digital program-controlled telephone system
- FA (fire automation) ：Automatic fire alarm, sprinkler systems and associated linkage
- SA (security automation)：TV monitoring system, patrol system, alarm systems, access control systems, garage management system
