(Before you posted those images, we found an image of yours in the formZ gallery and used that as a reference while working. It's not quite the same as what you posted after we made our example project.)
We reworked your setup as follows.
• Added columns inside the space, so you can evaluate transmission as well as reflection.
• Use the "Architectural Glass, Normal" material hint, with Shaded transparency set to around 50% for greater reflectivity. You will want to experiment with this value.
• When using Architectural Glass (i.e., AGS, rather than true "High Grade" glass), your glazing should be modeled as a single surface, not solid objects. We corrected this.
• Enable "Hide Architectural Glass Hint Materials from GI" for efficiency. (If using a referenced MXM AGS, do this manually by enabling 'Hide from GI' Maxwell Attribute on each glass object.) We enabled this.
• The plane material must be made an emitter- like a giant photo lightbox. See setup for "Background Plane Emitter" material.
• There were multiple dot (".") characters in your image map filename. While this will work most of the time, it can cause issues over networks, on renderfarms, etc. Replaced with dashes.
• We are going to use an image emitter material in the plugin, so it needs to be in an HDRI format. To convert your image, follow the steps below.
1. In Photoshop, open WilsonPeak-Telluride-CO-Photo-Credit-The-Hotel-Telluride-HiRes.jpg
2. Select Image > Mode > 32 bits/channel (or equivalent in your version)
3. Select File > Save As..., and set the format to Radiance (.hdr)
• Make sure the normal of the mapped plane faces the subject; emitters only emit light in the direction of the normal.
• Closed aperture to f22 for extreme depth of field (fine for architecture, and renders faster)
• Adjusted exposure
• SL set to 12
• We created an Extra Sampling channel for just the glass material, and set it to render to SL 15
• Enable Multilight. This allows you to adjust the intensity of the background image after rendering.
• Disabled Reflective Caustics and Refractive Caustics for efficiency
This 1200x900 rendering took 6m 55s on a machine with geekbench score of around 16000, with multilight enabled.
Requires latest Maxwell Beta: http://forums.formz....rly-build-3208/