The house was converted to a double tenement in the 1890s, and further subdivided into three apartments circa 1920, with a fourth created about 1960. These modifications included the conversion of the blind window on the south side of the building to a new entrance; the removal of the pocket doors that once divided the twin parlours and the demolition of the partition that housed them. New partitions were constructed to create an entrance hall between the parlors; a massive stairway installed in the original hallway, leading to the second floor; the original stairway truncated, with a landing inserted, and the bottom steps turned 90 degrees, balustrade removed, and the whole enclosed in a new plastered wall. A massive soundproof partition was erected on both the first and second floors to divide the house; appropriate bathroom and kitchen facilities installed in the four apartments; original ceilings on the second floor covered with sheathing, which, in turn, was overlaid variously with embossed tin squares or Insulboard. Original floors were covered with either hardwood flooring or plywood underlay and tile. New partitions were constructed, old partitions truncated, and doorways moved.
In the course of these modifications serious damage was inflicted to the original structure, particularly through the installation of the “new” plumbing, heating and electrical wiring. Many floor joists were severely weakened and one carrying timber was truncated with a complete disregard to the necessity of its presence. Further damage was incurred by water entering the the north walls of both the basement and the first and second floors, resulting in the rot of supporting timber in the wooden walls, and the disintegration of mortar in the laid stone foundation. Over time, dampness in the basement allowed settling of supporting posts and pillars and rot to infest floor joists in some areas. Possibly the removal of sheds and other outbuildings, and the resultant alterations to the contour of the ground on the north side of the building, facilitated the flow of surface water through the foundation into the basement area.
Original floor plans or blueprints do not exist, nor have any worthwhile pictures or drawings of the interior been discovered. It was necessary, therefore, to embark on a careful archaeological exploration of the main house, under the direction and guidance of Peter John Stokes, LL.D., F.R.A.I.C., restoration architect, to determine the original configuration of the building’s interior. In order to discover traces of the original partitions, doorways, wall coverings, wood finishes, decorative details, etc., extreme care and patience had to be exercised. Wallpaper was steamed and removed, layer by layer; painted surfaces selected for similar treatment, small “windows” opened in plastered walls and ceilings in order to inspect the underlying lath, studs and nails. Caution had to be exercised in the interpretation of findings, as some areas had been repaired and/or extensively replastered. Eventually, the original configuration of the building was determined to the satisfaction of the architect.