Lighting: It's best to be aware of what kind of light your office receives before choosing a plant. Most plants grow well with bright light without direct sunlight, which is an east, west or even a south facing window with the plant sitting a couple or more feet back. Some plants (check above) thrive in low lighting conditions and can grow well enough within north facing rooms.
Other care conditions: Some plants have greater care needs than others which may not be suitable for certain offices or they need too much time for the average busy office worker. Choose a plant (most of the above) which are fairly low maintenance.
Who's maintaining them?: Plants other than personal ones on a desk are best to be assigned to on person to maintain them, otherwise you get a scenario where either too many people are watering them or no-one at all. They will also need feeding and other matters taken care of which is carried out better when one member of staff does it.
Artificial: For some offices artificial types are the best option, which are purely for décor purposes and have no clean air benefits to offer.
Hiring: If plants are an important part of your office décor, and you don’t want the responsibility of maintaining them, or your office is visited by important people and customers - another option is to hire a company which rent plants and maintain them for you. You may only want plants for special events, which can be arranged with the hire companies.