I think Perdogg's pic is of the wrong house.
Check out Zillow.com:
http://www.zillow.com/search/Search.z?addrstrthood=610+n+buchanan&citystatezip=durham+nc&mode=search
I recall reading in the news reports that it was next to the corner house on Urban, so it would appear zillow is correct.
I think that's an east-west alleyway that runs between 610 Buchanan and the house to the south. Urban appears to be further north.
Best I can find, Bissey is described as only a "neighbor". He must be in the house to the south which goes deep enough to have an overview of the back yard of 610 Buchannan plus the alleyway between them. This would give him the perfect opportunity to see the activity that night.