1. Stone or brick walls with small windows or no windows at all
2. Metal paneling with small, irregularly spaced openings
3. Concrete walls with textured or patterned surfaces
4. Stucco walls with small, square windows
5. Wooden siding with painted over or closed off window openings
6. Corrugated metal sheets with limited window openings
7. Glass block walls with angled or obscured sections.
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