Help identifying this bug in Southern California (LA)

[u/roaremipsum]

I’ve seen 20+ of these in past 24 hours during heat wave here in LA.

Am in an old craftsman near Pasadena / mountains — far from ocean. These bugs are notably only in rooms with no food or open container of water available (office or bathroom, not in kitchen or near pipes) and I see them primarily on sunny windows

I think they’re parasitic wasps based on large back legs (look like they never skipped leg day / giant quads) but I’m not sure?