security service

I am seeking a security service that can provide physical security for a medium-sized office building. The needs of the office are primarily for security systems, such as CCTV cameras, alarms, and access control. As such, I am looking for someone who can recommend the best security systems for our needs, and that can provide the installation and ongoing maintenance of these systems. In addition, I require someone who is able to handle any repairs should any of the equipment become damaged or malfunction. I am looking for a service that will provide reliable security coverage and be quick to react should the need arise. Some experience working with small, to medium-size office buildings is preferred. I am open to suggestions and different ideas for my security needs, so if you have creativity in this area, please let me know.