Rows & columns set the window grid; Row variation makes floors different heights so windows come in a variety of sizes.
On/off is odds; Run length clusters lit windows into streaks (the horizontal bands); Dark floors leaves some floors mostly unlit.
Height map uses exactly three values — black = concrete, grey = lights off, white = lights on — so relief stays crisp.
Drag on the preview to blank out a section — carved to concrete for a billboard, blank wall, storefront base or setback. Add as many as you want; the building underneath stays the same.