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Castlereagh Street is a 1.6-kilometre-long (0.99 mi) major street located in the Sydney central business district in New South Wales, Australia. The street runs in a north-to-south, in a one way direction only.

The City Mutual Life Assurance Building is a heritage-listed commercial building located at 60-66 Hunter Street, in the Sydney central business district, in the City of Sydney local government area of New South Wales, Australia. It was built during 1936. It is also known as CML Building and 10 Bligh Street. It was added to the New South Wales State Heritage Register on 2 April 1999.

Qantas House is an Australian heritage-listed office building at 68-96 Hunter Street, Sydney. It was designed by Rudder, Littlemore & Rudder and built from 1955 to 1957 by Concrete Constructions Pty Ltd. It is also known as No. 1 Chifley Square. The site was added to the New South Wales State Heritage Register on 25 May 2001.

Capita Centre, is now known as 9 Castlereagh St Sydney, is a skyscraper in Sydney, Australia. Located at 9-11 Castlereagh Street, it is 183 metres (600 ft) tall from spire and 158 metres (518 ft) tall from roof. The building was designed by Harry Seidler & Associates in 1984 and completed in 1989. The building won Royal Australian Institute of Architects (NSW) merit award 1991. The structural engineer was Miller, Milston & Ferris and the builder was Civil & Civic. The building was designed to be the new company headquarters for City Mutual (Life Assurance Society Ltd). The land-locked site at 9 Castlereagh St was chosen because of its close proximity to the company's old landmark "City Mutual Building" at 60-66 Hunter St. City Mutual wanted their new headquarters to be lavish, so no expense was spared in the building design. In 1987, City Mutual changed its name to Capita. The building cost $200m and was opened in 1989. The Capita Centre is rectangular (with varying floor plans as there is a diagonal light shaft through the building) and consists of 34 levels, with a total floor area of 24,450 square metres (263,200 sq ft). The building is constructed of composite structural steel and concrete, with its support structures making it unique as it wears its structure on the outside as an outer skeleton. The external columns or lateral bracing truss are unique because they exist outside the core of the building. This building’s design is discussed in detail by Harry Seidler in a 1993 lecture (synchronised with illustrations nos 13-24) recorded by UK architectural journalist Monica Pidgeon whose film archive is available online. www.pidgeondigital.com After Capita went into liquidation, the building at 9 Castlereagh St then became a tenanted commercial office tower. Because the tower was originally a company headquarters (with a diagonal hollow shaft to allow sun through the building), this building is one of the few Sydney prestige office towers which can provide small spaced floor plans. The building's lobby was refurbished in 2011 and won Australian Institute of Architects (NSW) Commercial Architecture Award Commendation 2012.[1] There is a porcelain mural by Lin Utzon in the ground floor lobby - installed in 1989. There was a second Lin Utzon sculpture "Capita 2" on the company executive floor. The last managing director of Capita (who later ran the company into liquidation) did not like the executive floor's design so arranged for the whole Seidler -designed executive floor on Level 31 to be gutted. Some architects from the Seidler office saved the Utzon artwork from being destroyed (traced wall paint outline and removed the porcelain cylinders). This Lin Utzon artwork featured at Museum of Sydney during a Harry Seidler exhibition in late 2014-15, and in 2016 was reassembled to Seidler office penthouse, Milsons Point. A Charles O. Perry sculpture "30” Helix Mobius Mace" (1988) was also part of Capita's executive floor on level 31, but when the executive floor was gutted, the sculpture was moved to the building basement. The Perry sculpture was later relocated to the building's entry lobby as part of the ground floor enhancements of 2011.

Phillip Street is a street in the central business district of Sydney in New South Wales, Australia. While the street runs from King Street in the south to Circular Quay in the north, the present street is effectively in two sections, separated by Chifley Square. Other cross streets include Martin Place, Bridge Street, and Bent Street. It is the hotspot of Sydney's legal elite.

Perpetual Trustee Company Building is a heritage-listed office building at 33-39 Hunter Street, in the Sydney central business district, in the City of Sydney local government area of New South Wales, Australia. It was designed by Robertson and Marks architects and built from 1914 to 1916 by Walter Gawne and Sons. It was added to the New South Wales State Heritage Register on 2 April 1999.

New South Wales Club building is a heritage-listed former clubhouse and now offices located at 31 Bligh Street, in the Sydney central business district, in the City of Sydney local government area of New South Wales, Australia. It was designed by William Wardell and built from 1886 to 1887 by John Try. It housed the New South Wales Club from 1886 until the club's amalgamation with the Australian Club in 1969. It was then sold and the two rear wings demolished in 1973 before the surviving front portion was converted to offices. It was added to the New South Wales State Heritage Register on 2 April 1999.

The State Savings Bank Building is a heritage-listed large bank building and commercial offices situated at 48-50 Martin Place, in the Sydney central business district in the City of Sydney local government area of New South Wales, Australia. It was designed by Ross & Rowe Architects and Consulting Engineers and built from 1925 to 1928 by Concrete Constructions Ltd. It is also known as The Government Savings Bank of New South Wales, Commonwealth Bank building (former), and CBA Building. After several decades of use by the Commonwealth Bank of Australia, including as its headquarters from 1984, it was purchased by financial services company Macquarie Group in 2012, refurbished, and now serves as Macquarie's global headquarters as 50 Martin Place. It was added to the New South Wales State Heritage Register on 17 November 2000.

The Rural Bank Building was a landmark bank and commercial building on a block bounded by Martin Place, Elizabeth Street, and Phillip Street in the central business district of Sydney, Australia. Completed in 1936 and designed in the Inter-war Art Deco style by the bank's chief architect, Frank William Turner, the building served as the Rural Bank's main headquarters until 1982. Despite its distinctive design receiving recognition for its heritage value as "one of the finest art deco buildings in Australia", including from the Australian Institute of Architects and through a listing on the Federal Register of the National Estate, the Rural Bank Building was controversially demolished in 1983 and replaced by the postmodern State Bank Centre development by Peddle Thorp & Walker, prompting greater community efforts to protect the heritage of Sydney.

Hunter Street railway station is an under-construction station on the Sydney Metro West line that will serve the Sydney central business district. It will be built on the corner of Hunter and George Streets and Bligh and O’Connell Streets. Upon opening, it will provide connections to Sydney Trains and NSW TrainLink services at the existing Wynyard and Martin Place stations, as well as to M1 Metro North West & Bankstown Line services at Martin Place station. Construction commenced in 2023.

The MLC Building is a heritage-listed office building located at 42-46 Martin Place in the Sydney central business district, in the City of Sydney local government area of New South Wales, Australia. It was designed by Bates Smart & McCutcheon and built from 1936 to 1938 by Concrete Constructions Limited. It is also known as Mutual Life & Assurance Building. It was added to the New South Wales State Heritage Register on 2 April 1999. From the time of its construction and for many years thereafter, the building served as the offices for Australian life insurance company, Mutual Life & Citizens Assurance Company Limited. As of December 2018 the anchor tenant was Norton Rose Fulbright, formerly Henry Davis York, an international law firm.

The Sofitel Sydney Wentworth (also referred to as the Wentworth Hotel) is a heritage-listed luxury five-star hotel located at 61-101 Phillip Street in the Sydney central business district, New South Wales, Australia. The Wentworth Hotel on this site opened in December 1966, to a design by associate architects Skidmore, Owings & Merrill and Laurie & Heath in the Post-war International Style, replacing the original Wentworth Hotel on Lang Street, which had operated since 1855 as one of Sydney's most prominent hotels. Originally owned and operated by Qantas, the hotel was operated by Sheraton from 1982, Rydges from 1995, and has been operated by Sofitel since 2004. The hotel stands at a height of 58.8–63.4 m (193–208 ft), with 20 floors and 436 hotel rooms.