Your perspective's vanishing point seems to be above your picture, which makes for a very odd perspective on the building. Personally I would try lowering it.
Here's an example:

And a quicky for a night time scene with added neon sign example:

lessen the brightness
up the contrast a bit
shift the color balance more to blue
Here's an example:

And a quicky for a night time scene with added neon sign example:

lessen the brightness
up the contrast a bit
shift the color balance more to blue