Since the simultaneous terrorist attacks in 2001, we first adopted a security gate in a rental office building in Japan. We renovated in 2005 and further strengthened. Specifically, in addition to security gates, a non-contact IC card reader was installed as standard equipment in the elevator, the reference staircase room door, the rental room door, etc., and we built a security system that can be controlled in four stages. Furthermore, in 2016 we introduced the latest security gate with repair of the office entrance.