an access card is required. If you are a visitor, go to the security guard in the lobby on the first floor and tell him which floor you are going to (sometimes you have to register your name, ID card and room number). Then the security guard will help you brush the elevator access control and press the floor yourself.

I have been to Yangzhou Wanda Apartment (the one next to Lippo) twice this year. The first time I have to register, the second time I don't have to. ...