Hey Christian, thanks for your Feedback!
youre right, the Bricks are really a bit to large. Thanks i'll change it.
Actually im doing the "outside" details. The Interior has no Details yet, so the debris from the Bathroom is still missing but this will be changed if i start to create the Details for the Interior.

Yesterday ive beveled the Edges of the buildings to get an smoother look / created an small shelter for the back of the building / retextured the rain gutter / created an chimney at the middle top of the roof and created a pile of debris in front of the building (beneath the large hole).

Next Steps will be:
-creating some Pipes for the Rain Gutter
-unwrapping + Texturing the Shelter and Pile of Debris
-crating some Ivy
-editing the Brick Texture

Anyone else?

regards Sebastian