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A glass wall sounds large.  It might be cost prohibitive or impractical for other reasons to erect a tent or box around it.  Choosing the time of day and how you light it might work.  If it is dark outside and you light the inside, the camera can easily shoot through the glass and show the illuminated area with minimal reflection.  Conversely, if you shoot from inside while the interior is relatively dark, and there is daylight outside, you should get minimal reflection, this might be the best time to try out a CP filter.

Here are two photos showing the effectiveness and limitations of a CP filter.  I used a Canon Rebel T2i, Sigma 18-250 mm lens at 18 mm and a 72 mm Tiffen CP filter because the lens has a 72 mm filter ring.

This is without a filter



And, this is with the filter installed and adjusted to reduce reflection as much as possible


Click on an image and it will take you to a larger image on Flickr.  You can arrow left/right to switch between the two and see the change caused by the filter.  To minimize the time between photos, I shot the “with filter” shot first, then unscrewed the filter and shot the “without filter” photo.

If you are just worried about your reflection, you could put the camera on a tripod, set the 10 second timer and walk away.  The camera can be made smaller in the reflection by moving it further from the glass and using a different, longer, lens to frame the image the same.