Hold on there fellas, I'm one of those building management types and I'd like to give my take on this. I've been managing high rise office buldings in a city environment for more than 20 years and I can tell you that even with layers of contingency plans for things like emergency lighting, "stuff happens" and there will not always be someone to blame for it. You are the one responsible for your own safety, remember that.
In lieu of battery powered light packs, all of my buildings have emergency lighting circuits fed by back up diesel generators which are run/exercised weekly, professionally inspected and serviced monthly and full tested yearly when the transfer switches are serviced as well.
Now, Fixer mentioned that he thought that a transformer on the roof may have blown. If that was the case then even if there was a back up generator its job might have been to power that transformer, which in turn was to feed the emergency lighting. So there is problem #1. Even with line power and generator power at hand, it's the emergency "system" itself that fails. It has happened to me, twice. Once when a 13kv transformer in the vault under the sidewalk blew and cooked the buildings switch gear and distribution system. Another time was when water from a leak within a pipe chase entered the main buss duct at the basement level. Ka-Boom and no more buss duct and no way to get power to the upper floors even though line power and back up power were still available.
Fixer also mentioned he had time to check the servers and some offices before the Power Co. arrived and suggested that they evacuate. The battery packs in the stairways were burning during that time but getting dimmer by the minute. They were probably function tested routinely but only for a momentary flash of light. So Problem #2, because of the delay, when the evacuation began in earnest the batteries were already finished. I know I'm not aware of the exact time line, Fixer, but you get the idea. Battery back up lights are temporary, very.
Remember the first World Trade Center bombing when the blast in the basement knocked out most of the emergency systems including lights, sprinklers etc. and people had to leave through darkened stairwells. I know for certain, that after that event, measures were taken to "ensure" that the same thing would never happen. Then on 9/11/01 the stairwells went dark again.
Our building Security and Maintenance staff are required to carry flashlights (that work) at all times. We have installed battery pack lights in addition the the genarator powered emergency lights. Stairwell stair treads are marked with luminescent tape and directional stickers. Fire evacuation teams are supplied with large chemical light sticks. And still, I always have at least two flashlights on me.
And for the record, unless someone was hurt, the Fire Mashall wouldn't be too worried about the stairwell lights after the fact, as long as the past inspections were up to date and the lights were promptly repaired. No field day. They only put the pinch on you after noted violations have been left unabated for a length of time. Again, don't count on the Fire Marshall/Dept. to protect you!
Just think though, if everyone in the stairwells had a flashlight it would have been a lot of fun. Good work Fixer. There, I think I feel better now.