Just finished this. Awesome mission, I really enjoyed it.
Just some minor issues in a overall great mission. I can only recommend to play part 1 of this series, and then this, they really build up nicely on each other. Good stuff.
Another urban FM I absolutely loved. It was nice to see even more content and detail compared to the first part, including the extra challenges which were an unique idea. Some of the objectives required noclipping or looking at the hints in the first post, and I also experienced the bug where one of the hidden doors wouldn't open. I'm looking forward to seeing a part 3, if and when you plan on creating such a thing... your approach makes for some of the best FM's I've played so far.