Hi,
if your camera is not moving, you can try masking the window (pan/crop – mask).
If your camera was handheld, you can still try to mask it, but probably you’d need tons of keyframes to be accurate.
In this case I’d even try chroma key, that may work too, if your scene is dark overall, but the window is so bright that it burns. Chroma key set to white (or near white) may mask it out. Experiment with it!
And when you already have masked the window, place something to the track below, which you’d see in the night when you whatch out of that window.
Kind regards