Unwrapping buildings with holes I have been struggling for more than a week on how to unwrap this shape:



The two ways that worked are the "Project from view" and "cube projection", but the texture stretches among the Y axis when they are applied so it must be uv unwrapped.
From the Blender Manual:

Smart UV Project
Breaks the mesh into islands based on an angle threshold.


The islands are arrange to best fit the texture.
If you want to select an island, press L while the pointer is over a vertex to select the linked ones.