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Cadogan Group Limited and its subsidiaries, including Cadogan Estates Limited, are British property investment and management companies that are owned by the Cadogan family, one of the richest families in the United Kingdom. They also hold the titles of Earl Cadogan and Viscount Chelsea, the latter used as a courtesy title by the Earl's eldest son.  The Cadogan Group is the main landlord in the west London districts of Chelsea and Knightsbridge, and it is now the second largest of the surviving aristocratic Freehold Estates in Central London, after the Duke of Westminster's Grosvenor Estate, to which it is adjacent, covering Mayfair and Belgravia.
The Cadogan Estate covers 93 acres (over 376,000 square meters) of the Royal Borough of Kensington and Chelsea, including residential properties, offices and retail space. The Estate has been under the same family ownership for almost 300 years. The Foundations of the Estate were established in 1717 when Charles, second Baron Cadogan, married Elizabeth Sloane, daughter of Sir Hans Sloane, having purchased the Manor of Chelsea in 1712. This part of London has remained under the stewardship of the Cadogan family ever since, the tradition continuing today under the present Chairman, Viscount Chelsea, and his father, Earl Cadogan, who is Life President.
Today the Estate includes approximately 3,000 flats, 200 houses, 300 shops, 500,000 square feet (over 46,000 square meters) of office space and over a dozen gardens covering 15 acres (some 60,000 square meters).
The Estate's long history, family ownership and conservative financial structure permit a long-term approach, the area developing into one of London's most notable neighbourhoods.
The company owes its origins to Sir Hans Sloane, a well-known explorer, physician and collector, having purchased the manor of Chelsea in 1712 and the 10-acre (40,000 m2) site of Beaufort House at Cheyne Walk in 1737. Sloane later died in 1753 without any male heirs, leaving his estate to two daughters.
In 1777, Charles Sloane Cadogan – then Earl Cadogan – granted a lease to architect Henry Holland to create the first-ever purpose-built new town. "Hans Town" provided attractive Georgian terraced houses to people of moderately affluent means. Jane Austen and her brother lived in one; William Wilberforce, who led the movement to abolish slavery, in another.
As London swelled during the industrial age, the 5th Earl Cadogan, George Henry Cadogan (1840-1915), undertook a review of his estate and decided on a comprehensive redevelopment. He commissioned cutting-edge architecture and a new red-brick style that became synonymous with the area: Pont Street Dutch. The opening of Sloane Square Station happened in 1868 and the completion of the riverside embankment in 1874. During the period 1877 to 1900 much of the modern Estate took shape. Cadogan Square – the "jewel in the crown" of the new development – the Royal Court Theatre at Sloane Square and Hotel Trinity Church on Sloane Street were built under the 5th Earl's auspices and received support from Cadogan to the present day.
The 5th Earl was a Chelsea councillor and its first Mayor. His grandson, the 7th Earl was Chelsea's last (before being incorporated with the Royal Borough of Kensington). He died in 1997 aged 83, the title passing to Charles Gerald John Cadogan, the present Earl Cadogan. The 8th Earl, having been involved for many years as a director and then chairman, is now Life President of Cadogan. His son Viscount Chelsea is the current chairman.
Chelsea has a bohemian history and has long been a haven for artists, authors, musicians and designers from Dante Gabriel Rossetti to The Rolling Stones and Vivienne Westwood. Jane Austen stayed in Sloane Street with her brother Henry whilst writing Pride and Prejudice , and poet and writer Oscar Wilde called the borough his home.
The Estate includes one of London's most upmarket retailing districts, based on Sloane Street, and also contains some very expensive residential property in some of central London's most sought after residential locations. Originally commissioned by Charles, 1st Earl Cadogan in the 18th century, Sloane Street has evolved to become one of the world's most exclusive retail destinations – the epitome of London luxury. An impressive list of flagship stores - including Chloe, Salvatore Ferragamo, Giorgio Armani, Tom Ford and Valentino - line the street stretching from Knightsbridge to Sloane Square attracting a truly global clientele. 
In July 2016, Cadogan launched George House, a £205 million office and retail development on Sloane Street that includes luxury flagship stores – Red Valentino, Boutique One, and Delpozo and smaller independent shops that can be accessed via Pavilion Road. George House also connects directly with new public realm, an open-air courtyard that also features a Granger & Co restaurant and gym from KX Urban. 
Following a consultation with the local community in summer 2015, Cadogan pledged to create a destination for independent, artisan traders behind the new George House development on Sloane Street. Established fashion and beauty boutiques have now been joined by exciting new artisan food shops in November 2016: a traditional family butcher, Provenance; fine wine shop – Pavilion Wine; bakery and school – Bread Ahead; Natoora – a fruit and vegetable specialist, offering a range of fresh seasonal produce and London Cheesemongers, who specialise in sourcing traditionally produced cheeses. 
The King's Road has roots dating back to the 17th century, when access along the route was only granted to those carrying a special token bearing the king's initials. The route was made public in 1830, at a time when the area was becoming settled by artists, creatives and bohemians who hugely influenced its legacy.
For today's locals and visitors, the Kings Road retains bohemian vibes, brought up to date with a rich array of stores, restaurants and coffee shops, cultural offerings, bars and much more. It is still one of Chelsea's most popular destinations and continues to attract a diverse crowd. 
In October 2015, The Royal Borough of Kensington and Chelsea unanimously granted planning approval for Cadogan to redevelop 196-222 King's Road. Plans include a new 400-seat boutique cinema auditorium, a new pub for the local community, as well as retail, residential and office space that will respect the heritage and enhance the special character of its surroundings. Completion of the scheme is expected to be 2020. 
Sloane Square is at the heart of Chelsea and the Estate, and one of London's most glamorous locations for shopping, culture and dining. Its landmarks include the Royal Court Theatre and department store Peter Jones.
Cultural life on the square is richly served by the Royal Court Theatre and Cadogan Hall, home to the Royal Philharmonic Orchestra. Holy Trinity Sloane Square welcomes a thriving church community and is a must see for fans of the Arts and Crafts Movement. 
Sloane Square today, ringed by London plane trees, is a place where visitors and residents meet, drawn by the attractions of its many shops and cafes; flagship stores line the square, and its side streets are filled with independent and artisan retailers.
Newly created by Cadogan in 2004, Duke of York Square was the first new public square to be opened in London for a century, and now hosts over 30 shops, 6 restaurants, flats, schools, offices and a weekly Fine Food Market. A massive undertaking to redevelop Ministry of Defence land and buildings, the project also created a new home for the Saatchi Gallery which displays one of the largest private collections of contemporary art and hosts free exhibitions seven days a week. This carefully curated public square at the junction of King's Road and Sloane Square offers fashion, beauty, food and culture in the heart of Chelsea. 
Current plans include a new café at the heart of the square, designed by NEX Architects. Their new vision for the café features a glass wall that is able to rise and fall depending on the weather – the first of its kind in the UK, due to open in 2018. 
Cadogan Hall, just north of Sloane Square, is another example of a successful acquisition and repurposing on the Estate. Cadogan bought it in 2000 as a dilapidated church and converted it into a world class concert hall that seats 900 – creating a new subsidised home for the Royal Philharmonic Orchestra. Incorporating state-of-the-art lighting and sound systems, plus bespoke acoustic technology appropriate to a world-class performance venue, the refurbishment retains many of the original features including stained glass windows by Baron von Rosenkrantz (who trained in Tiffany in New York). 
On 14 June 2018, Westminster magistrates court fined Cadogan Estates a total of £180,000 for the 'uncontrolled release' of asbestos during renovation works to one of the Estate's properties. The asbestos contamination occurred at Rosetti Studios, Flood Street, Chelsea, in June 2015. Cadogan Estates admitted that there were failures in procedures to ensure the adequate control of asbestos during the renovation process. 
Other large privately owned historic estates in London include:
Kensington is an area of London in the Royal Borough of Kensington and Chelsea, around 2.9 miles (4.6 km) west of Central London.
The Royal Borough of Kensington and Chelsea is an Inner London borough with royal status. It is the smallest borough in London and the second smallest district in England; it is one of the most densely populated administrative regions in the United Kingdom. It includes affluent areas such as Notting Hill, Kensington, South Kensington, Chelsea, and Knightsbridge.
Knightsbridge is a residential and retail district in central London, south of Hyde Park. It is identified in the London Plan as one of two international retail centres in London, alongside the West End.
Chelsea is an affluent area in West London, England, due south-west of Charing Cross by approximately 2.5 miles. It lies on the north bank of the River Thames and for postal purposes is part of the south-western postal area.
Earl's Court is a district of Kensington in the Royal Borough of Kensington and Chelsea in West London, bordering the rail tracks of the West London line and District line that separate it from the ancient borough of Fulham to the west, the sub-districts of South Kensington to the east, Chelsea to the south and Kensington to the northeast. It lent its name to the now defunct eponymous pleasure grounds opened in 1887 followed by the pre–World War II Earls Court Exhibition Centre, as one of the country's largest indoor arenas and a popular concert venue, until its closure in 2014.
The Metropolitan Borough of Chelsea was a metropolitan borough of the County of London between 1900 and 1965. It was created by the London Government Act 1899 from most of the ancient parish of Chelsea. It was amalgamated in 1965 under the London Government Act 1963, with the Royal Borough of Kensington to form the Royal Borough of Kensington and Chelsea.
King's Road or Kings Road, is a major street stretching through Chelsea and Fulham, both in west London. It is associated with 1960s style and with fashion figures such as Mary Quant and Vivienne Westwood. Sir Oswald Mosley's Blackshirt movement had a barracks on the street in the 1930s.
Sloane Square is a small hard-landscaped square on the boundaries of the central London districts of Belgravia and Chelsea, located 1.8 miles (2.9 km) southwest of Charing Cross, in the Royal Borough of Kensington and Chelsea. The area forms a boundary between the two largest aristocratic estates in London, the Grosvenor Estate and the Cadogan. The square was formerly known as 'Hans Town', laid out in 1771 to a plan of by Henry Holland Snr. and Henry Holland Jnr. Both the square and Hans Town were named after Sir Hans Sloane (1660–1753), an Anglo-Irish doctor who, jointly with his appointed trustees, owned the land at the time.
South Kensington is a district just west of Central London in the Royal Borough of Kensington and Chelsea. Historically it settled on part of the scattered Middlesex village of Brompton. Its name was supplanted with the advent of the railways in the late 19th century and the opening and naming of local tube stations. The area has many museums and cultural landmarks with a high number of visitors, such as the Natural History Museum, the Science Museum and the Victoria and Albert Museum. Adjacent affluent centres such as Knightsbridge, Chelsea and Kensington, have been considered as some of the most exclusive real estate in the world.
Sloane Street is a major London street in the Royal Borough of Kensington and Chelsea which runs north to south, from Knightsbridge to Sloane Square, crossing Pont Street about halfway along.
West Kensington, formerly North End, is an area in the ancient parish of Fulham, in the London Borough of Hammersmith and Fulham, England, 3.4 miles (5.5 km) west of Charing Cross. It covers most of the London postal area of W14, including the area around Barons Court tube station, and is defined as the area between Lillie Road and Hammersmith Road to the west, Fulham Palace Road to the south, Hammersmith to the north and West Brompton and Earl's Court to the east. The area is bisected by the major London artery the A4, locally known as the Talgarth Road. Its main local thoroughfare is the North End Road.
Brompton, sometimes called Old Brompton, survives in name as a ward in the Royal Borough of Kensington and Chelsea in London. Until the latter half of the 19th century it was a scattered village made up mostly of market gardens in the county of Middlesex. It lay south-east of the village of Kensington, abutting the parish of St Margaret's, Westminster at the hamlet of Knightsbridge to the north-east, with Little Chelsea to the south. It was bisected by the Fulham Turnpike, the main road westward out of London to the ancient parish of Fulham and on to Putney and Surrey. It saw its first parish church, Holy Trinity Brompton, only in 1829. Today the village has been comprehensively eclipsed by segmentation due principally to railway development culminating in London Underground lines, and its imposition of station names, including Knightsbridge, South Kensington and Gloucester Road as the names of stops during accelerated urbanisation, but lacking any cogent reference to local history and usage or distinctions from neighbouring settlements.
West Brompton is an area of west London, England, that straddles the boundary between the London Borough of Hammersmith and Fulham and Royal Borough of Kensington and Chelsea. The centuries-old boundary was traced by Counter's Creek, now lost beneath the West London Line railway.
Squares have long been a feature of London and come in numerous identifiable forms. The landscaping spectrum of squares stretches from those with more hardscape, constituting town squares —to those with communal gardens, for which London is a major international exponent, known as garden squares.
The Duke of York's Headquarters is a building in Chelsea in the Royal Borough of Kensington and Chelsea, England. In 1969 it was declared a listed building at Grade II*, due to its outstanding historic or architectural special interest.
Cadogan Hall is a 950-seat capacity concert hall in Sloane Terrace in Chelsea in the Royal Borough of Kensington and Chelsea, London, England.
Hans Place is a garden square in the Knightsbridge district of the Royal Borough of Kensington and Chelsea, London, immediately south of Harrods in SW1. It is named after Sir Hans Sloane, 1st Baronet, PRS, physician and collector, notable for his bequest, which became the foundation of the British Museum.
Cadogan Square is a residential square in Knightsbridge, London, that was named after Earl Cadogan. Whilst it is mainly a residential area, some of the properties are used for diplomatic and educational purposes.
Pavilion Road is a street in Chelsea in the Royal Borough of Kensington and Chelsea, London. It runs parallel to Sloane Street and is accessed from Sloane Square in the southern end and Basil Street in the northern end.