Here is one of the HDR photos I took recently at the end of sunset (or at the beginning of blue hour).
I used focal length of 105 mm to compress perspective a little bit and to make buildings appear closer to each other. In this case I manually blended 5 exposures mainly to restore some details in the shadows as the buildings in front were rather dark.
Camera: Canon 5D MK III
Lens: Canon 24-105 f/4 L IS USM
Focal length: 105 mm
Exposure time: 13 s ("middle" exposure)
Number of exposures: 5
E.V. Step: 1.0
Flash used: no
Technique: HDR, manual blending, luminosity masks
Software: Magic Lantern 2.3, Lightroom 5.0, Photoshop CC