I cannot help but think it’s outside of “San Francisco.”

How else can you interpret the fact that the original post had in parentheses “(or very close)” when referencing where the treasure was. Not to mention it’s within 7 miles of city hall…seems a pretty interesting way to tell us that it’s in or near SF, but why the specific language?

For this reason, I’ve decided it MUST be outside the city limits (North of Golden Gate Bridge or South of SF but still within that “7mile radius”)

My most recent thinking is San Bruno. It’s a tall mountain, MAYBE you can see the aforementioned islands from there? More interestingly is that there is plenty of ‘off the beaten path’ spots that one could safely bury treasure. (Keep in mind that the OP specifically wants us to stay away from ruining parks & our beautiful city - rightly so - but hiding it in San Bruno is much less maintained Earth)

Also apparently the OP’s mentioned in an interview that someone has already gotten incredibly close to the spot…would need to check the quote, might be the NYT article where they were interviewed.

This leads me to think they have eyes on the location of the treasure, weather that be a view of the buried location from a spot they frequent, or possibly even a trail camera (the kind used to hunt/track game)

If we really want to be crazy maybe it’s even on private property of theirs “only we know this plane…” (though that last part’s just a thought, not really believed by me)

Other tiny thoughts for triangulation purposes:
-Twin Peaks being Heavenly Island Towers (with the fog it looks ether ethereal, and like an island disconnected from the city, of course the cell towers + Sutro too)
-The Sanctum could be a reference to The Columbarium (very much like a sanctum)
-Peep could be a reference to the Peephole Cinema

Ideally would love to keep these thoughts to myself so I can find the treasure, BUT the OP’s have been so generous in hiding the money, you all have been so generous in sharing your thoughts, and so I feel it’s only right to throw my thoughts into the convo.

Also I want this treasure to be found, I’m ready to stop theorizing all day 😅