I remember some of my favourite spaces in the city I lived in where narrow valleys between buildings like this. The trick for light (enough for a great garden) was to hang cheap mirrors on the top part of each side wall.
If i remember correctly most had a deal along the lines of they will maintain the wall exterior (paint, looking for damage ect.) as the tall building really did not have easy access to their outter wall.
Depending on its orientation, it’s probably pretty dark inside too.
I remember some of my favourite spaces in the city I lived in where narrow valleys between buildings like this. The trick for light (enough for a great garden) was to hang cheap mirrors on the top part of each side wall.
I was thinking whitewash and mirrors! If the owners of the buildings either side even allowed it that is.
If i remember correctly most had a deal along the lines of they will maintain the wall exterior (paint, looking for damage ect.) as the tall building really did not have easy access to their outter wall.