This is a guide to get into the Hangman’s Apartment in Long Drop Full Stop in the Stonemarket in Thief 2014.
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Getting into Hangman’s Apartment
To retrieve Basso’s pen go to the rooftop near the objective marker. Go over the beam and turn right to drop the bridge with the wirecutter:
Go onto the bridge and attach a rope arrow to the beam above you:

Fire a Rope Arrow at the Highlighted Beam to be able to Get into Hangman’s Apartment in Long Drop Full Stop in Thief 2014
Use the rope to jump to the window near the objective marker. Basso’s pen is on one of the tables inside.