Question

why there is red light upon large apartment and large towers ​

Answer 1

so that aeroplanes come to know that there is a building there.

Answer 2

the red light is there because it is a warning sign for the helicopters and planes do that they don't crash They have red light to avoid collision from aeroplane and helicopter, by putting red light pilot gets notification that there is some object. This is called aviation light or Aircraft warning lights.

pls mark brainliest as i worked hard to answer you