21. The south eastern side party wall is shared with the one storeyed building adjacent to Edwards Chambers. 22. It belongs to both titles, and there is a Party Wall Act which regulates matters concerning it. 23. The staircase started to be attached to the party wall and run at right angles to the street. 24. The fenced-off tracks are on its west; it shares a party wall with another commercial building to the east. 25. They feature pitched corrugated iron roofs with round dormer windows, exposed party walls and chimneys with four terracotta pots. 26. :: : In Britain, a " party wall " is the wall within the building which separates adjoining houses. 27. The ground floor of the Merton Street end tenancy has had party walls removed and has a suspended ceiling. 28. Any internal wall can become a party wall and have a significant portion removed from the surface area as openings. 29. Internally in the undercroft at street level, some 13th century sandstone fabric is still present in the east party wall . 30. The party wall that once separated the two segments of the building has been broken through at a number of points.