To get into some of those buildings. You have to have your license, vaccine card, a mask, and a reason to get by the main building reception. Not a great one. Sometimes the name of a business and the suite number is all that is required. When you get off the elevator on the shared space floor. There you usually need a better reason to keep going. They sometimes call the suite for confirmation. Or, most common, there is a BMS (Building Management System) and the tenant has to login to the portal and register your name and company. The receptionist will ask for your license. Scan it in. And print out an ID card on an adhesive label. You are supposed to wear that at all times. I do this once or twice a week.