Designed by William Whitfield, the present 12-storey library was constructed in 1968, and extended in the 1980s and 1990s. It formed the centrepiece of the new campus buildings built across Hillhead during the 1960s. In line with architectural fashion of the period (Edinburgh University Library opened its new eight storey main library in a similar style in 1967), it is of Brutalist design, being clad in Precast concrete flint aggregate panels. (However, , the building was overclad in an "aluminium rain screen system" due to deterioration of the original panels.) The main library floors are stacked in a central core with the peripheral towers containing services. The cluster of towers are reminiscent of San Gimignano, and form part of a complex that also incorporates the Hunterian Art Gallery. The original building has been extensively refurbished to facilitate a modern information technology environment. The library has collections ranging from astronomy to zoology, as well as a world-class Special Collections department. Special Collections on level 12 has an internationally significant collection of manuscripts and printed works. In the foyer there is a display area featuring changing exhibitions of rare material from their collections. In 1993 the Glasgow University Library complex was selected by the international conservation organisation DoCoMoMo as one of sixty key Scottish monuments of the post-war era.