The Customs building is a historic landmark of Sydney located at Circular quay. Built in 1844-1845, it was the main administrative building of the Customs Department until 1990. Then it came into the possession of the City of Sydney Council and was used for exhibitions and private events. And after a thorough renovation in 2003, it also housed the City library, Sydney.

In the basement of the building is the layout of the Central business district of Sydney size 4, 2 x 9, 5 meters, look at you from above through a glass floor. Layout, weighing one ton, was built in 1998. Here you can see paintings and photographs of the building, created throughout its history.

They say that from this place the natives from a tribe eora watched the arrival of the First Fleet in Sydney Harbour in 1788. Here in 1790, was hanged prisoner David O'connor, and his spirit, according to legend, still roams the Customs Building, offering all the counter a glass of rum.

The initiator of the construction of the building of Sandstone at Circular quay was Colonel John Nathaniel Gibbs, head of customs for a record 25 years – from 1834 through years 1859. He urged the Governor of the colony of New South Wales George Gipps, referring to the growing Maritime trade turnover of Sydney. The two-story Georgian-style mansion was designed by architect Mortimer Lewis. Its highlight were 13 huge Windows on the facade, which provided panoramic views of Sydney Harbour and passing on her ships. The Colonel Gibbs, who lived in the house opposite, could watch the construction of the Customs Building, sitting on the veranda of his estate Watonga (today the Building of the Admiralty).

In 1887 the building was partially demolished and raised to three stories under the direction of architect James Barnet. During the next century it had completed the various elements, particularly active during the First World war, but the basic details of the Customs house has been preserved in its original form.