All business owners have got an obligation to keep common areas safe and to keep the whole facility reasonably safe for people who are visiting the facility or people who work in the facility. For doors that allow access from outside the building, those doors really should have locks on them, and the people who work in the building should be able to participate in their own security. If the building owner takes charge of the whole security apparatus and they do a lousy job at it, and somebody gets hurts because of a criminal act, that business owner is going to have some really hard questions to answer.