shatterd palace mission help please
 

Hello! I'm new to this. Ok I've did everything mission requested but getting on little bird. I'm on top of build there's 2 helicopters but it will not end mission. I looked at the map help part it as a blinking light for way point but i can't find on map. I've ran all over the city an looked at map no luck. I've tried for 3 days now. Could someone please help me out. Thank you in advance.