Found: Sentinel/Stargate crossover
Thank you annieb1955 and (swear word) Microsoft for the sucky search function in Windows 7 which did not find "atlantis" while searching through my saved fic.
original message:
Cloaked Atlantis lands on Earth in Frisco Bay (I think) but Jim with his Sentinel sight tells Blair that Jim can see a city out in the water and they row out to Atlantis breaching security.
original message:
Cloaked Atlantis lands on Earth in Frisco Bay (I think) but Jim with his Sentinel sight tells Blair that Jim can see a city out in the water and they row out to Atlantis breaching security.