Brick Design Concrete Door Fill In
Here's a work of art you don't seem to run into
This was a doorway and someone chose to fill it in with mortar or concrete.
After they filled it in, they decided to make their own mortar lines to give you the illusion, after it is painted, that it was filled in with brick.
Very clever and creative.
After this building has been painted and someone is doing a home inspection, they could very easily overlook this section of the wall.
If somehow this was built poorly or incorrectly, you could have a structural issue on your hands, over time.
While inspecting properties like this, be aware of the creativity, some people have.