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

I used to work at various office buildings in NYC. It was not unusual to see fire department people walking around the building. Doing inspections and discussing the layout of the building. The FD people make it a point to know the buildings in the area they are posted.