Okay well lets see I can answer some of these based off of either basic knowledge or from my Militaria Collecting knowledge and none of them will help the cause.
1. House - Have you ever been to Germany? A lot of houses look like that. It is a traditional style German house and you see them all over the country.
2. Eagle Insignia - Means nothing they just do not have them sewn on. If you look at there uniforms they are standard Luftwaffe uniforms and they are just missing the breast eagle. Not uncommon actually.
3. Cuff Stripes - At first look I thought they were cuff titles but since they are on both sleeves and Cuff Titles were only worn on one sleeve these must be the stripes worn on an officers tunic based off of his rank/grade. They mean nothing to identify a unit because well many officers wore them.
4. The Markings - The Markings that you are talking about mean nothing also. One officer has a tie clasp and they all medal ribbons over there breast pocket. This just means that they have recieved awards and name an officer in the German military that was not given awards. Can not be used to identify unit.
5. The Medal - The medal you are looking at on that officer is actually job badge or war badge as some people call it. For the Luftwaffe they had among others these badges for Paratroopers, Anti Aircraft, Pilots, Aircrew, etc.. That is all that means.
6. Stripes above left pocket - Again as stated in Number 4 they are ribbons designating medals. Nothing more.
None of these things can help identify the unit. The only thing that would help is if someone recognized the senior officer which is the 3rd Officer from the right. My guess is this is somekind of training school unit.