Answer December 2019
The clues show two vents in the roofline of the building at 2 Market Street. The first photo above shows the frontage on Market Street, while the remaining two show the back from Church Row.
Assuming they are vents, their purpose, and why they were needed in that building and not others, is not known. Might it be something to do with a prior use of the building?
If you know any more about this building, please leave a Reply below.
Thanks to Stefan for the photos.
Maybe the vents are useful for parking your sleigh?