I guess I'm confused. I had to go back to get missing tiles after everything was done (Bunny King captured) and had no issues with the gates. I just went back & hopefully I'm looking at the right thing, the gates are up and shouldn't be blocking any tiles. If you're talking about getting the tiles in front of the building, you have to go up & around, to get the tiles from the left side. If that's not what you're referring to, perhaps a screenshot of what your predicament is, would help.