There is a render showing a roof terrace here The Vantage, 32-36 Great Victoria Street, Belfast - not sure how up to date that isLooks like there has been a tweak to the extension of the Vantage 32-36 Great Victoria street. Planning application in to turn roof into a roof terrace with glass balustrade.
No docs up yet so can’t see what it will look like.
Application ref. LA04/2021/0397/F