Police and firefighters were called after a woman climbed up some scaffolding.
The woman climbed up the Phase One hostel in Oriental Place, Brighton, at 1.15pm on Friday, November 16.
A Sussex Police spokesman said: “About half an hour later she came down and has been arrested.
“Inquiries are at an early stage and no further information is immediately available.”
See the latest news headlines from The Argus:
- MP slams council for 'lack of thinking' over new Brighton seafront plans
- UPDATE: Baby with life-changing and man with life-threatening injuries after fire at nail bar
- Woman airlifted to hospital with serious head injury after A27 lorry smash in Chichester
- Father told to walk four miles home in torrential rain with baby over £3 parking fee
- Sussex set to be hotter than Istanbul, Prague and San Marino this weekend