Gleneagles is a notable example of the work of architects JC Cook & Cowen who were responsible for a number of important residential building commissions in the inter-war period. Their work is characterised by the generous proportions of the spacious apartments, reflecting their striking use of utilitarian design and Art Deco detail. The Art Deco features of the Entrance Hall are amongst the finest in Johannesburg. This scale and quality was made possible by the boom in Johannesburg's fortunes and economic recovery, post the 1930s depression. Built in stages, the final section of Gleneagles was completed in 1937.