Is it reasonable for the owners of old residential areas to pay the property management fee directly to the security guards as wages?

Is reasonable. Security work in residential areas is a part of property management, so security fees should be included in property management fees. If the owner pays the property management fee, there is no need to pay the security fee. If the property company outsources the security work to the security company, it should pay the service fee to the security company, which has nothing to do with the owner.