Office bearers and their workers may have had, from time to time, to utilize the goods or cargo lift. This they would have had to do in times of emergency. Two such examples will have been that of a fire outbreak and that of the building being placed under attack by rogue elements. Now, why would they have had to use the cargo lift, or taken the stairs, as opposed to just utilizing the passenger lifts in the first instance?
Taking the stairs instead of the lift comes well recommended by health advocates. Provided that you do not have too many floors to climb, the reasons for doing so should have been obvious by now. But no questions asked when the building is on fire and you all need to leave in a hurry but in an orderly manner, ideally guided by your appointed and trusted fire marshal. Ironically, taking the stairs down to ground level under such circumstances is a lot quicker than having to take the passenger lift.
Who knows how many people could be waiting in the lift lobby under normal circumstances, never mind in an emergency? The point being now that not everyone is able to take the stairs under any circumstances, if not awkward or downright dangerous, it would be almost impossible for any wheelchair bound person to do. It is a conventional practice then that in the event of an emergency, people who are physically challenged and in a poor state of health will be required to take the cargo lift instead.
And given its weight carrying capacity, it would be a lot safer for them too. You will see that each cargo lift will be clearly marked, saying just how much weight it is allowed to carry.