The additional download files for Patrons can be found here or from the Master Map Index or the Waterdeep Dragon Heist Index.
This is my interpretation of the Encounter 10 - Converted Windmill from the module Waterdeep Dragon Heist.
Converted Windmill. A crumbling two-store stone building that was a windmill long before the city rose up around it. Now it has been converted to a residence (autumn), a suspicious butchers shop (winter), cultists hideout (summer), or is home to squatters (spring).
Converted Windmill - Waterdeep Dragon Heist is unofficial Fan Content permitted under the Fan Content Policy. Not approved/endorsed by Wizards. Portions of the materials used are property of Wizards of the Coast. ©Wizards of the Coast LLC