[1] Located in the City of Westminster, it runs north to south connecting Marylebone Road and Blandford Street.
Until the second half of the nineteenth century it didn't run as far north as the Marylebone Road, with the short David Street and buildings blocking the route.
At the southern end is the 1899 Grade II listed Chiltern Firehouse, formerly the Marylebone Fire Station and now converted into a restaurant.
[4] A particular feature is the large redbrick Portman Mansions constructed in the 1890s at the northern end of the street.
[5] Notable residents of the street have included Henry Segrave the world land speed record holder in the 1920s, who is now commemorated with a blue plaque.