The main building was re-roofed and all interior and exterior walls were painted.

Some bridges have advertisements on interior or exterior walls.

These exterior walls bore most of the weight of the building.

"Because of the zoning, we had to preserve almost all exterior walls."

Proposed reconstruction, in the best case, will retain only exterior walls.

The bricks were used to build both interior and exterior walls of the house.

Some of the interior walls contain windows, revealing that they were once exterior walls.

Cemesto was used primarily for interior and exterior walls.

And that increase would be even greater for corner apartments, which have two exterior walls to account for.

Several of the interior walls show weathering, proving they were exterior walls at some point.