Great image, I don´t like the artificial look of the sky though.
I once faced a similar problem. If this is your house (or you have a key for it

). You can do the same approach I did (especially if you have an assistant):
There might not even be a need for HDR, or even photoshop. Keep the exposure the same as you had, and then you go and turn off the lights after e.g. 15 seconds (or 20sec. or whatever you like best). If you have somebody to do that for you, you can use your phone to give instructions rather than shout out loud

or maybe you have an app you can use to remotely control your camera?. That way you can exactly adjust the brightness of the light to the stars in the back. If you want the foreground to be lit like in the final edit, you just take two exposures - one with brighter lights to light the foreground and then you mask the layers in photoshop with a very soft brush.
Did you use a flash? In the final edit it looks as if there is some light comming from the camera. To avoid that direct light look, you could set the flash to a lower power setting, walk around during the 30sec and fire the flash from various positions. And cover it with an orange filter (it looks slightly cooler) - or adjust it later in lightroom using local adjustments.
In regard to your 30sec limit mentioned above - consider using bulb and some kind of cable or wireless release to not touch the camera during the image is taken.
EDIT: bulb wouldn´t be that good of an idea because that would introduce star trails
