The former Edison Brothers warehouse in St. Louis, MO (It is now a hotel and condominiums.) is covered with trompe l'oeil painting. These are the only photographs I could find; unfortunately, they are too small to do it justice. This building has NO real 3-dimensional decoration--it is all paint on a flat surface. Most of the "windows" you see are fake, too.

http://www.hotel-rates.com/us/missouri/saint-louis/sheraton-st-louis-city-center-hotel-and-suites.html

http://www.stlouislofts.com/400south14th.html

http://www.rgbrinkmann.com/projects/project-display.php?id=33

Here's a better photo of another project by the same artist, Richard Haas, in Cincinnati, OH.

http://commons.wikimedia.org/wiki/Image:Cincinnati-cincinnatus-mural.jpg