In experimental version .48 after many hours of testing, all high value targets (military, police stations, piano houses) we visit are completely empty. I believe what is happening is when players pick up loot in those places, that loot then respawns but because there are many possible spawns near by, it is unlikely to respawn in the high value location.
The end result is that the high risk/high reward locations that used to drive interesting gameplay are now always empty. For them to get much chance of loot again, all the surrounding loot spots would have to be looted which is pretty unlikely as often the high value locations are only visited for that loot.
Example: Barracks in Chapaevsk will always be empty once initially raided as the loot will respawn scattered around surrounding apartment blocks that will never be raided.