I was looking forward to checking out this map as soon as I saw it.. You are one of my favorite mappers I hope you know. And yeah you keep getting better and better.
This map is incredible. The details are perfect actually. You've managed to cram so many things into a small space without making it look crammed. The underground sewage tunnel looks great. The broken bricks look cool and are actually functional in one part (hint). The cement pillars with metal bars sticking out look really.. real. The cranes make this whole thing look endless as do the skyscrapers. This is atmosphere by definition. This is art. I don't even care if it's playable.. It's that good-looking. The vents look perfect. The particles actually look real. There are details put in the windows even, what with curving them... And you didn't cheap out on the cranes either. I don't know how long this would have taken but it doesn't look rushed in the least. I will wager you spent hours running around in the map thinking of what else you could put in to make it gorgeous..
There are actually two things I can suggest changing. The cranes are a little.. intersecting, I agree. I'd shorten one of them but don't remove one. Maybe even consider moving it back so it doesn't get so close.
The other thing (trivial) is the 'broken' tiles on the ground. You have a different texture on the sides than on the top so it looks a little weird. Consider making that uniform.
Actually another thing, maybe this is too far but instead of the brown things for jumppads you can use the spinning blades? Just a thought.. Since you do use them elsewhere where they don't have a jumppad effect it may be too much. Do change that though.
-Edit: Also change that red roof.. It looks really bad, I didn't notice that before. It would be easiest to make it so it's the same height all the way around, but that would mean either pushing the one building out or putting something on top of the one roof.. Maybe an AC or generator would be cool. Either way, simply for artistic purposes the roof is ugly. I fixed it a little in 30 seconds. I'm a prude like that.
5/5. And.. Ughh. NEVER STOP.