I Know that there is already another post how to get up there, but that's a second way, and for me... faster
just follow my paintskillz ^^
Get up here, and now, jump up the pillar looking west by wallhopping
Simply jump on the roof when you are high enough
--> GZ you are ontop of the BG house.... very simple way i guess ^^
now go where ever you want to
if you decided to follow the pink path, go to this point and play with your camera
--> voilà
BUT: if you move now, it's possible that you stuck and can not get away there without port or something
Maybe you try this way next time waiting for 2vs2 7 minutes ^^
hf & gl