I keep a old Ovation under my desk at work for playing during lunch. I may play a little myself, or a group of us may play in someone's office, and on nice days we may go to a park that is close to work.
If I were you, I would purchase a good used guitar (garage sell guitar) or use an old guitar you have had for years. I work with a lot of really great people, but anyone could rip off my guitar from another shift. That's why I keep my old Ovation at work (I hate my Ovation). It's worth only $300-$400. I would never leave any of my Martins, Taylor T5, or my PRS unattended for 5 minutes (I love these guitars).