It sounds like maybe 165 N canal if my recollection from when I was condo shopping is correct (it was a bit above my price range, but I seriously envied the large storage space). The condo I ended up buying (a converted office building in the east loop) has a similar hall of storage rooms but they are much much smaller and not practical for anything other than storage.
Sorry, it’s been a long time and I don’t remember. I know that we were looking for places that were within a 15-20 minute walk from the Loop offices where we worked.