Liking it so far.
That's good. The interior section is a tad bit blocky for my liking and is in need of a lot more details. On the other hand, the exterior is not too bad at the moment.
I've also started another map that takes place within Subway Tunnels:
Notice the character in the background, does
he look familiar? A skin variant of a certain character model from a game.
Does anyone want to take a guess, or do they recognise the character?