I got a chance to survey a 1880s landmark residential building in the Soho area of Manhattan. These units were full floors with three exposures. An elevator core & stairwell adjoined the two buildings to one. I briefly snap a few shots as I worked.
And lastly there was a pocket door. Simple in theory but not utilized much today though it was and still is a great space saver. A joyous experience as I survey necessary building repairs.
Jared W Smith, R.A.