UPDATE:
I have recovered my drone. With the help of member msinger AKA MavicHelp who was able to analyze my flight log and point me in the direction where the bird went down I was able to return to the scene and speak with the building management about the incident. I was honest about my mistake and described what happened. I was fully expecting them to be angry but surprisingly they were not. They were very understanding and cooperative. The security agent went onto the roof of the west wing (the building has the high rise tower in the middle with two four story wings on both sides) and there it was, right in the area msinger indicated it would be. Next to the air conditioner. Which, by the way was in the area that my friend and I covered in his drone but he did not think to go that far north or get close enough. Upon reviewing his video we did see it, but being so far away did not recognize it for what it was, tiny as the Mavic already is.
On the first search the security found the aircraft body and battery laying a few feet apart but the camera was missing. She went up an hour later on and found the tiny camera under the rooftop air conditioning unit and called me back to let me know she had it. Upon thanking her profusely and offering a reward which she graciously declined I was beyond stoked.
Now onto the good: the Mavic flies! Two props were broken at the tips but after replacing them the Mavic took to the skies without a beat. This thing loves to fly. Full functions, telemetry, altitude, speed, LED beacons, GPS, flight data all works as it should. Full range of movement. Arms are just fine. It folds and unfolds just like it did out of the box. The thing is built well. It did take an impact to the nose towards the starboard obstacle sensor and has a nasty scratch there. The top front cover is cracked near that spot. Starboard side front arm has a slight scuff near the red navigation light. Starboard rear arm has some very very slight scuffing to the bottom of it. Other than that, the rest of the body is absolutely flawless. Port side arms unaffected, heat sink on the bottom is mint. Maybe with the ability of the arms to fold allows it that much more "give" in a collision which could mean the difference broken an intact arm or a broken one.
The bad: Battery is destroyed. Like totally wasted. It looks like a twisted lump of plastic. It took a huge beating in the crash and got ejected. I can't imagine the foot pounds of energy that rippled through it during the sudden deceleration. The camera / gimbal mount has been detached from the aircraft body. The assembly looks like it might be fine, but the ribbon / connector has been torn. See the attached pictures.
Here's what happened: My Mavic lost RC connection as it flew around the building in question. It went into failsafe RTH. Without any way of getting input from me it initiated RTH and swung itself around and climbed from 252 feet to 90 meters (295 feet) which was the predetermined RTH altitude. As forward vision sensors were turned OFF at the time it did not engage them on the RTH. It dutifully made a beeline back to the home point before flying smack dab into the northwest/west side of the building. It fell about 250 feet to the rooftop of the west wing below. Member msinger went through my flight data and informed me of this and the recovered video from the drone collaborates with his information. He showed me a detailed satellite picture and highlighted the area where it went down. Thanks msinger! If you guys ever need help with located a downed drone please make him your go-to guy! He rocks!
I am going to work with DJI on repairing my drone as it appear that it does not have user serviceable parts at this time. I will keep you updated with the repair progress. Thank you to the members who offered support and especially to the one who offered me detailed help. It made a difference in being able to recover my Mavic and begin the repair process. Both of the Mavic and of my humility and bruised ego. I will most definitely fly smarter from now on.
