This is 3 exposures blended together using my advanced Photoshop tonality control and multiple exposure blending techniques. I produced a video detailing these techniques, it's available here: www.zschnepf.com
I reprocessed this image recently for some upcoming art shows. The first version turned out too dark, especially for print. This version is much more effective conveying how luminous the scene was that evening. The print turned out fantastic this time, so I thought I upload the reprocessed version.