Hi all, I'm still lurking my way through this thread (fell way behind and am now on pg. 1011, trying to do 10 a day) but I recently came across the post on page 1005 or thereabouts finally showing the northern portal to the North Hill Street tunnel, and that inspired me to fire up LA Noire again (something I rarely do these days) to go hunting for pictures.
There's the good ol' north portal:
Just inside the tunnel:
The alley behind Temple:
The Figueroa underpass at Temple:
Up near the City Oil Field:
And an imaginary hillside along Figueroa near Chinatown: