First, you should look into your work's policy on inter-office relationships. Some companies have a strict no-dating policy when it comes to their employees. Then, you should decide whether or not it would be worth it to pursue a relationship with someone at work, if you were to break up. Do you spend time with this person outside of work? Maybe try spending time with him outside of work and get to know him in that context before you throw caution to the wind and pursue your romantic feelings for him.
"Caring is not an advantage."