This is a guide to getting into Montonessis Abode in A Stroke of Madness in the Stonemarket Blackfurrow in Thief 2014.
Getting into Montonessis Abode
To steal the painting go near the objective marker. Look for a beam you can attach a rope arrow to:
Climb up the building and use the rope to get to the entrance to the building and steal the painting, for which you need a razor that you can buy from a shop.