In 1879 the gas works on gas street was relocated to the south and the old gas works and holder were demolished. The site was redeveloped as the general office block for the works. It was a very large building with two levels and the main entrance was facing Stratford Road with large blue doors. There were a number of offices within this block including the works managers office. There were also three entrances and staircases within the building. The golden staircase which goes from the the main Stratford Road level down the the accounts office. It is called the golden staircase because only the manager and office staff used it. The second staircase and entrance was in the back of the drawing store and there was a third entrance and staircase which was reached from the development office from the arcade walkway. In the summer of 1986 work started on a new office building and this was finished in September of 1987 . The office staff vacated the old office block and moved to the new location at the west end of the site.. From September 1987 till 1991 the office block stood empty and for same reason I am yet to find out. Then half of the office block was demolished and then after that in the summer of 1991 the rest of the office block suffered a major fire and was burnt to the ground.
I got some of this info from David Hilliard of Railcare