User blog comment:Essie Essex/Interactive Dunwall Map/@comment-27004218-20151222134035/@comment-16533050-20151223091925

Personally, I wouldn't bother with Brigmore Manor.

First - we don't know exactly where it was located in relation to the map itself. A random arrow just pointing somewhere isn't going to help.

Second - although Kingsparrow Island lies off the map, there is actually a picture of it represented on the map, thus giving a visual aid. This visual aid also gives a more precise indication as to where the island exists with regards to the rest of Dunwall as represented by the map.

As no such correlation for Brigmore Manor can be derived from in-game descriptions, I believe the best course would be to not represent it at all.