We recently moved to a new building at work and I took some shots while the floor was still empty.
When I left the building I noticed the sign about not doing any photography inside. Too late!
I took the standard 3 shots (-2 eV, 0 eV, 2 eV), created an extra -4 eV shot from the -2 eV one, removed some chromatic abberation, saved all as TIFF and used the four TIFFs to create an HDR image. Then the tonemapping, removing some noise, adjusting levels and curves, removing some more noise, and then I sharpened the image.