A commercial property owner not only needs to know what's happening on his own property, but also what's happening in the surrounding area. He can't turn a blind eye to a neighborhood where there are robberies, or break-ins to cars, or lots of car thefts. He has to take all that into consideration when deciding what is reasonable security for his property. Reasonable security in a high crime neighborhood might include a watchman, it might include cameras, additional lighting. A property owner has to look out for his customers.