On Suurkatu until 1795 there were three buildings which had been built next to each other. The westernmost of these, built in 1758, was a one-storey dwelling house (11 x 5.9 m), which had a living-room, a chamber and a shed. Under the first two rooms was a cellar. The building also had a small office. Next to this building was a wood shed (5.3 x 3.7 m) dating from 1758 (?). Finally there was a one-storey panelled dwelling (20.2 x 8.3 m) dating from 1753 which had been built on top of a vaulted cellar. It had an hallway passing right through the building. On the western side was located a drawing-room and behind it, facing the street, a chamber. Facing the yard was a kitchen, with an exit into the yard. At the eastern end of the hallway, facing the yard, was a chamber and, facing the street, a shop with an exit on to the street. There were hatches in the windows.

At the western end of the wall there was a 75 x 50 cm brick structure. Under the uppermost layer of bricks was uncovered the supporting irons for the curved hinge pin of a door. This was evidently the lower hinge pin of the cellar door, because there were only five layers of the brick structure before the foundation stone was reached.

Remains of the westernmost building were found under Aleksanterinkatu. In the profile, at the location of Rooms S and U, there remained a brick and stone structure belonging to the north wall of the old cellar. Around six metres of the upper surface of the stone wall was revealed, but its inner wall was found to continue eastward under the wall of a later stone cellar as far as the location of Room X. The length of the stone wall was 7.5 m, which corresponds to written information about the length of the cellar.