Anything to get rid of window glare/reflections?

Every month I take an exterior photo of a window at an art gallery I am part of. I take the photos at night to get the lighting from within the display area to show. I've tried to avoid getting the reflection but am getting frustrated from the lack of anything working. Several attempts using a polarizer have yielded no different results.

Any suggestions? Do I have to learn to accept the reflections?

I bet you're going to get some great responses. My naive thoughts:

1) remote strobes, duplicating the light that is present in the display. Overpower the ambient behind you. A 2'x4' softbox forming the ceiling. It would enhance the reflection of anything directly outside the window, though, so you'd need to deal with that.

2) Curtain behind you to block out the reflection. Yes it would be big but years ago I bought a 10x20 black backdrop that would probably do the trick, hung from poles. Might have to adjust your shooting angle.

3) Really adjust your angle and shoot a wide-angle pressed up to the glass with a boot.

4) hang a white sheet inside the glass, take a pic, remove the sheet and see if you can subtract the reflection in Photoshop?

I don't think in your case, there is much that you can do. The typical methods, CLPs or shooting while against the glass isn't going to do much. You might try different angles or wait until it's much darker out which can minimize reflections. The best way would be to shield the window from anything that can reflect, something like a large black sheet, but that seems a bit impractical here. Maybe others have better ideas.

Polarizing filter on the lens can improve things in reducing reflections seen in glass surfaces, but not always

With polarizing filter

I forgot about shooting close to the glass with a boot. I think that might work; it would definitely be worth a try. I can do a couple and stitch together with a vertical pano.

It gives me a good excuse to go back and try something different.

Thanks for the replies from everyone!

Try lenskirt