For a simple quick easy to do:
First I would neutralize that pinkish color cast to get back what is white and gray as white and gray.
1) Colors > Levels..., take the pipette and select that white on the awning (1)
2) Then on the histogram move those two cursors (2) to "straighten" the blacks and light them a bit
3) Then on the "output level", move the white cursor inward (3) to get back the lights on the top and facade of the different buildings at the back, or your lights will be a bit blown out.
Now what is should be gray like the first wall on the left is gray, and white a more real white.
Then duplicate your image, and go to Filters > Enhance > High Pass... with settings in the screenshot below and put then that layer in "Overlay" mode
Now it's more sharp (once this layer is in "Overlay" mode, you can duplicate that layer (the High Pass) as many times as you want to get sharper and sharper and sharper)
Now Select back the bottom layer in the layer stack and go to Colors > Hue-Saturation..., saturate as you wish
Use the Master first, then use selected color like red, blue, yellow to fine tune to your liking
Result Before/After with 3 High Pass layers, which is too much for my taste, but it's just to show how it can sharpen
The other pictures can follow the same process (with not so different settings)
First I would neutralize that pinkish color cast to get back what is white and gray as white and gray.
1) Colors > Levels..., take the pipette and select that white on the awning (1)
2) Then on the histogram move those two cursors (2) to "straighten" the blacks and light them a bit
3) Then on the "output level", move the white cursor inward (3) to get back the lights on the top and facade of the different buildings at the back, or your lights will be a bit blown out.
Now what is should be gray like the first wall on the left is gray, and white a more real white.
Then duplicate your image, and go to Filters > Enhance > High Pass... with settings in the screenshot below and put then that layer in "Overlay" mode
Now it's more sharp (once this layer is in "Overlay" mode, you can duplicate that layer (the High Pass) as many times as you want to get sharper and sharper and sharper)
Now Select back the bottom layer in the layer stack and go to Colors > Hue-Saturation..., saturate as you wish
Use the Master first, then use selected color like red, blue, yellow to fine tune to your liking
Result Before/After with 3 High Pass layers, which is too much for my taste, but it's just to show how it can sharpen
The other pictures can follow the same process (with not so different settings)
Patrice