A thread about office buildings in /r/askreddit got deleted. Here was my reply about why office buildings are awesome.
I've worked in commercial real estate for several years, and know all the secrets.

* Somewhere on the property is a lockbox that contains a master key for every door of the building. 50% of the time, the code to the lockbox is either the building's address, or the address of the management company's home office.

* Elevators break down with people in them. It's called an "entrapment." It happens all the time. Especially sucks when it happens in a medical office building with a patient inside who needs to be rushed to another floor.

* Blood congeals very quickly when it starts reaching higher temperatures, so an A/C unit breaking down can be a life or death situation in medical office buildings.

* Those signs that say "owners are not responsible for theft or damage to vehicles" in the parking lot is a farce. You can get a settlement check if you fight.

* Throwing away your trash into an office building's dumpsters can actually cost the owner a LOT of money. One of my dumpsters costs us an extra $75/month because of people unloading their trash into it.

* There's an office building in Manhattan that was going to tip over and cause a domino effect, destroying the buildings in its path. Emergency repairs were completed overnight and the public, including those in the building, were never notified.

* On tall buildings, window cleaners grapple down from "roof anchors," which support them. These roof anchors can be damaged, so there are people whose only job is to inspect and repair them for safety. 

* Contractors come and go in office buildings all the time, but often through the service elevator so tenants cannot see them. Honestly, you could probably get to all of the secret rooms of a building if you just wear a blue denim shirt, a hard hat, and a clipboard, and we'll pretty much give you full access if you act like you belong there.

* If there is a building fire, the reason you don't take the elevator is not that it will break down and trap you. It's because the fire might be on the floor you are trying to exit from. The elevator door would open and you'd be trapped on the floor. So stairs are much safer since you can just walk back up to where there is less death.

* Large HVAC systems take more water than anything else in the buildings. It's in the tens of thousands of gallons to flush them.

* There are such thing as "dry-risers," which are water sprinkler systems that don't have water in them. Water will only pump when needed.

* The roof of taller office buildings is usually too "busy" with stuff to run across. There are HVAC systems, antennas, cell phone stuff, etc. Most amusingly, they often have "bird noise" machines to keep pigeons and such away. So the movies are way wrong. Those secret rooftop meetings would actually be frequently interrupted by the sound of a screeching golden eagle.

* You might be able to crawl through an air duct, but (1) it will be pitch black, and (2) you will be COVERED in grime and dust, they're disgusting inside.
[{"id": "d2vpzht", "text": "Crawling through the air duct, you'd also get scratched to hell and back by all the sheet metal screws and sharp metal edges.\n\nWhat is this about the building in manhattan?? Any details there?", "replies": [{"id": "d2vs8l9", "text": "Read the complete story about the building tipping over on the wikipedia page for the building:\n\nhttps://en.wikipedia.org/wiki/Citigroup_Center\n\nIt would actually make a fantastic movie in my opinion.", "replies": [], "depth": 2}], "depth": 1}, {"id": "d2wsogi", "text": "Office is probably the most interesting for a property manager, but pretty boring as a broker. ", "replies": [], "depth": 1}]