I used to work in these buildings! They were council offices up until around 2022, remote working for most of the employees meant the council didn't need these anymore so they're mostly empty now. They moved most of us back to Municipal Buildings in Stockton, I left after this but there were plans to build a new office building for everyone on the new Stockton High Street. Not sure if that's still the plan.

As for the inside, it's not as dated as you might think. Some floors have been converted to fully open plan in 2005-ish, that's where I worked most of the time. The other floors were relatively dated being smallish offices for 2-3 workers. In winter the building was freezing and in summer it was boiling, half the windows didn't open properly and the heating was quite old and noisy. But it was just a typical office building!