Is there hook to detect enter/exit BuildingPrivilege area

No, there is no collider or trigger,  only radius to closest block

ok was trying to make a ui load up when they enter a blocked or privlages area any suggestions?

You could check for building blocks in a radius from time to time and display UI if there are any, or call GetBuildingPrivilege and such stuff

How about this? mono atached to the player?

	private class uiMono : MonoBehaviour
        {
			public BasePlayer player;
			public bool Active;
			
            private void Awake()
            {
				player = GetComponent<BasePlayer>();
				CancelInvoke("inCupRange");
				InvokeRepeating("inCupRange", 5, 6);
			}
			
			private void inCupRange()
			{
				if (player == null || player.IsSleeping() || player.IsDead()) return;
				var theBuilding = player?.GetBuildingPrivilege();
				if (theBuilding != null && !Active)
				{
					if (!_instance.BaseProData.pData.ContainsKey(theBuilding.net.ID.ToString()) || _instance.BaseProData.pData[theBuilding.net.ID.ToString()].timeExpire < DateTime.Now) return;
					Active = true;
					 CuiHelper.DestroyUi(player, "BaseProtector_HelpUI");
					_instance.DrawHelpInterface(player, _instance.BaseProData.pData[theBuilding.net.ID.ToString()].protection);
				}
				else if (theBuilding == null && Active)
				{
					Active = false;
					CuiHelper.DestroyUi(player, "BaseProtector_HelpUI");
				}
			}
		}​

Could you not just check BasePlayer.IsBuildingBlocked() or BasePlayer.IsBuildingAuthed() ?

ya but i nedd the

 player?.GetBuildingPrivilege();

Anyways for the call so chose to check that.