Re: HPL1 form walk-in???
You can indeed walk into the Revenue building there and get it stamped.
I hear there's usually long queues but I went up on a Monday afternoon and the place was empty. In and out in a minute.
You could say it's part of the square, but it's not really! It's close enough to the Garda Station exit, when you come to the roundabout there take a look up to the 2nd floor. You should see a sign for it on the wall. It's close enough to argos too.