Black triangle with three white lights at each corner passed overhead slowly and silently at 9 pm in a residential area near hwy 101.

I walked out onto my deck around 9 pm and sat down. I looked up and immediately saw a big black triangular shape floating above me traveling north from the south. It had three dim orb-like lights at each corner of its triangular shape. I watched as it passed overhead in complete silence and then looked in the direction it was heading, but I couldn’t see anything. There was a commercial flight in the sky at the same time that was much higher and brighter, so I could tell this was only a few hundred feet above me, nowhere near the altitude planes fly at. It was closer to a drone in its movement, but it made no sound. The object was moving north from the south, approximately over highway 101. Vandenberg Air Force Base is south of here and it could've been coming from that direction.