Oh come on, making an artist reveal it all......... 
I was there partying a week before and noticed it would be a great place to shoot. The docks on cherry. It's the lot where TSN's motoring 2005/2004 etc etc does its road tests. You need to do a bit of trespassing to get here.
I was using the FL filter to get the purple/pink/blue tint. The secret is to shoot at the perfect time. If you shoot too late it is absolutely black and you get the orange. If you shoot too early you get the sky to turn purple(FL filter). It looks good purple, but not what I was aiming for. You need to catch it about 5 mins before it goes completely black. I was there about 30 mins waiting for the right time. If you want a pan, you need to be quick, because if you wait too long between shots, one image will come out orange while the other is right.
BTW small aperture (20'ish) and around 25/30 exposure time. ISO 100 at I think around 30-40 mm...Raw, mirror lock, cable release. etc etc.