How do I get rid of these black spots and lines?

(#_#) what is this? give more information

When I place a point light inside my structure these odd shadows are casted onto the walls and ceiling. It does not happen with any other light source or even outside my structure.

wow. never saw that :slight_smile:
are these glitch still here if you build lightning?

try to switch your light to movable, if it disappears, that means that s an issue with lightmaps.