So... no sprinklers, and no fire escape. And most likely no fire doors either.
Death trap.
No, many buildings will have the same standards, as IIRC the building had two exits served via separate stairwells.
You don't need a dedicated fire exit if your building has two separated normal exits and under a certain number of people inside, Fire exits tend to be for high occupancy buildings, buildings with high risks, and those that are large enough that you would otherwise have to go a long way to reach an exit.
Effectively you can have just two exits if the layout of the building is such that they are separate and your staff numbers are below the point where under regulations it's assumed they can exit via one in a certain time* (also in many areas things like windows that can open wide enough on the ground floor may be considered ok**)
Many supermarkets only have something like 2 fire exits plus the main entrance (and possibly a way through the loading area) despite having far more people in them, in a far larger area, and most of those people will only really be aware of the main entrance.
Most office buildings that size in the UK and US would probably not have a dedicated fire exit if they had two normal points of entry, and not high rise as under certain size/occupancy levels you don't need specific "fire exits", a normal entrance and back entrance will do, as the assumption is the fire won't spread that fast.
Sprinklers don't stop most fires, at best they're designed to slow a small fire (say a waste paper bin or electrical fault in an appliance) from spreading whilst people have a chance to grab an extinguisher or get out, and to some degree suppress smoke.
They do next to nothing in regards to a larger established fire, or if an accelerate has been used over a large area
![Frown :( :(](/styles/default/xenforo/vbSmilies/Normal/frown.gif)
They are also a risk in themselves in many instances where you have equipment or materials that can be damaged (your insurance will look at the risk of a fire where they might help vs the risk of an accidental discharge potentially causing hundreds of thousands of pounds worth of damage).
Firedoors - if the offices were open plan (as many studios are, not to mention other offices), there wouldn't be many firedoors in place except at the stairwells etc, and that's going to be down to local fire regulations of which Japan is from memory pretty strict on, so if it had passed a fire safety inspection you can be fairly certain it was up to code.
Unfortunately building designs and fire safety standards tend to be based on normal fires and related events, they don't take into account some nut with a grudge who creates a fire that in seconds reaches the sort of level a normal fire would reach probably only after the building had been fully evacuated and the fire service on site.
*IIRC in the UK we work to the assumption that X number can pass through a standard door in Y time, and you have to be able to show that you have enough capacity to exceed that when Z number of exits are blocked (so if you can get 50 people out through an exit in a minute and the rules say you have two minutes to clear the building then two exits would be enough for 100 people as it would allow for one to be blocked).
**I went to a school once where the secondary fire excape route for one room (only 6 people) involved breaking a glass vial on the window lock to allow the window to open through 90 degrees, then onto a flat roof that had a sort of guideway, and down a ladder, or a jump if you were feeling energetic/in a hurry/stupid (as a kid in a drill).