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these are amazing. I've always wanted to take pictures that give off this vibe. Does anyone know what type of postprocessing is required to do this?

Nighttime, long exposure with a blue-ish filter?

You can see some of the lighting halo/starbursts from where longer exposures were used, but much of the magic here is HDR.

I don't think it's even HDR. Just desaturated most of the colors, and hard pumped blue and purple.

To the GP: Search for cyberpunk / neon noir filters on google and tutorials on youtube. You'll find dozens to hundreds for both.