Perrott Lyon Mathieson was an Australian architecture firm based in Melbourne, Australia. Founded by Leslie M Perrott in 1914, the firm was responsible for numerous high-profile projects from the 1920s to the 1990s, and was associated with the Perrott and Lyon architectural families, spanning three generations and eight practitioners. History The firm was founded by Leslie M. Perrott as a solo practice in 1914, who started designing houses in then-standard Edwardian style, but employing an early form of reinforced concrete, his first projects being in St Kilda and Essendon. His own house in Brighton, built in 1925 in the Old English style, was also made of concrete, From the later 1920s, Perrott specialised in large residential hotels. The first was the Alexander Hotel in Spencer Street, Melbourne (now the Savoy Hotel), which opened in 1928 with 200 bedrooms, all with bathrooms, an innovation at the time. In 1934, he oversaw the design and construction of the upmarket Chevron Hotel in St Kilda Road in only sixteen weeks, seen as important for Melbourne's centenary celebrations of that year. The Hotel Australia in Collins Street was the most modern in the city in 1939, and became the social epicentre of Melbourne in the 1940s. It was demolished in 1989. In the early 1950s, Perrott's son, also Leslie M Perrott, but known as Les Perrott (1926–2001), joined the firm, along with the dynamic young Ronald Lyon. Leslie M Perrott & Partners maintained a busy practice on large scale projects. They sometimes documented designs by other architects, such as that of US architects Welton Beckett for the Southern Cross Hotel in Bourke Street, opened in 1962 (demolished in 2004), then the most glamorous and up-to-date hotel in Melbourne. Perrott Senior retired in 1966 in favour of his son. They were already working the firm's most controversial design, the Princes Gate Towers in Flinders Street, completed in 1967, and later known as the Gas & Fuel Buildings (demolished 1996). They also took on town planning projects as the Melbourne & Metropolitan Board of Works gradually relinquished powers to local Councils. In 1969 the firm was appointed to produce a town plan for the City of Prahran. In the early 1960s, the firm was engaged to investigate slum clearance in Carlton for the Housing Commission of Victoria. Known as the "Perrott Report" (1965), it recommended large-scale urban renewal, sweeping away seven blocks of terrace houses, shops