Sky Scraper City

is a website about just that and has some details on the proposals for Adam Street which according to them


"was originally part of the St David’s 2 master plan and was in the first outline planning application. It was dropped from the more recent applications and the site is being used as a temporary car park while St David’s 2 is being built. These towers may yet be built after St David’s 2 has been completed."
There are 3 residential tower blocks in the plan and the limited information they have can be found here just scroll down the list and click on Adam Street Developments Blocks 1,2, and 3