Eli5: How so firemen rapidly know the layout of large buildings in places like NYC during a large fire or emergency?

Question

Edit: Thanks for the folks that are in adjacent areas that got back to me and were kind, I was just curious as a laymen New Yorker.

UPDATE: One of my friends got back to me I guess they have blueprints and do drills and do drills and shit and that I’m not allowed to know the rest – whatever bitch tits, comments basically stated that

In: 75

Answer 1

Don’t forget that some buildings have to undergo fire inspections. They would also have access to the building inspector plans that have to be submitted to the city any time a building gets approved.