After being stopped twice that day in London by security guards I started looking more for signs that announced private property (I still don’t understand how a walkway in a city can be designated as private property). And as I walked around this passage, there was an open gate and a big sign announcing that you are entering private property, with few cameras pointed toward the entrance. So I put my tripod 1 cm in front of the sign, and took this shot. So I was still on public land :)