Is it illegal to collect license plate numbers in office buildings?

Not illegal. According to the inquiry method, Wang Lin explained that as a means of public security supervision, the collection of license plate information by property conforms to the law and is carried out within the scope of legal authority, which is not illegal. According to Article 25 of the Law of People's Republic of China (PRC) on Public Security Administration Punishment, unless otherwise provided by law, public security organs, state security organs, city appearance and environmental sanitation administrative organs and other organs responsible for public security administration according to law may, when necessary to maintain public security order, examine the identity documents of pedestrians, vehicles and ships, and inspect or seal up contraband, stolen goods and tools.