would be cool to meet up with some peeps over there.
Most roof access doors are at the top of the fire escape stairs. they’re usually locked and sometimes alarmed. i’ve had the best luck with older buildings. usually i find an elevator, then find the fire escape. sometimes doors will automatically lock behind you so it’s good to have something to keep the door slightly ajar like an eraser or a bottle cap or whatever i find laying around. Practice with hotels since you can basically walk in with street clothes on and a backpack and no one will look at you twice.
Lots and lots of research online. sometimes just driving around rough parts of a city/town. word of mouth from other fellow explorer/photographers. glad you like! thanks!