Architectural drawing showing east/west elevations. 'The East elevation is as built... the West elevation has been completely redesigned. In 1897 the roof line falls with the steep slop of Scott Street: in 1907 the lower part of the site provides a base for a soaring tower block containing the Library which, if it has affinities with the spirit of the traditional Scottish tower house, is completely twentieth century in all its detailing... Other changes were made in the course of construction,... the ashlar of the blank wall on the left was replaced by undressed stone and... the normal sized doorway grew to colossal proportions, extending well above the line of the windows (Mackintosh's pencilled alterations are just visible on the drawing).' (McLaren Young).
Mackintosh, Charles Rennie