The late, unlamented Greyfriars shopping centre in Ipswich.
Someone must have thought that halfway between the town centre and the station was a good place to put a shopping centre. Instead it just meant it was in the middle of nowhere, particularly as it was only accessible via dingy underpasses beneath a dual carriageway. Add to this the architecture, which I can only describe as poorly-executed sixties brutalism. Words cannot convey just how bad it looked, I can only hope that heads up the "How not to do it" section of any architecture syllabus.
Unsurprisingly, every retailer in the vicinity gave it a wide berth, and it was almost completely untenanted. I seem to remember that there was a shop there for a few years, but that was it. One. In fact the only reason to go there was to park your car in the multi-storey car park, and it was very much a car park of last resort, to be used only when all the others were full. Even the underground car park was nicer.
It was demolished sometime in the eighties. I moved away from Ipswich then, so I've no idea what it was replaced with. It can only have been an improvement, though.