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Port Authority is required to maintain a Heritage and Conversation Register under Section 170 of the NSW Heritage Act 1977 (the S170 Register). This Register lists Port Authority assets which have been identified as having State or local heritage significance. Many of the items on the S170 Register have been listed in other heritage registers as well, such as the State Heritage Register or on Local Environmental Plans.
At present, the Port Authority Heritage Register contains around 50 items, including items of State and local heritage significance. All items identified as having State heritage significance are proposed to be listed on the State Heritage Register, which is maintained by the Heritage Council of NSW. 

Some examples of the heritage manged by the Port Authority are provided below.

Hornby Lighthouse Inner South Head Watsons Bay

The Hornby Lighthouse is one of the oldest extant lighthouses in Australia.  It is a prominent and picturesque landmark with long historic associations in connection with the operation and management of the Port of Sydney and with important organisations such as the Colonial Architects office, army and military network and NPWS. The Hornby Lighthouse is an integral component in a system of lighthouses and other harbour lights that ensure the safe navigation of the Port of Sydney.  This system of lighthouses and light towers is collectively of State significance.

Grotto Point Lighthouse Sydney Harbour National Park Clontarf

Grotto Point Lighthouse - Front Lead is of State significance as an integral component of the collection of harbour lights that ensure the safe navigation of Sydney Harbour by local and international shipping. It is of architectural and aesthetic significance as a rare and notable example of a purpose built structure housing a navigation aid and it is a visually prominent landmark at the entrance to Sydney Harbour.

The Spit Lighthouse Parriwi Road The Spit

The light is of State significance as part of a group of navigational lights and beacons that collectively form the core of the navigational system for Sydney Harbour which enable it to operate as a world class port. The Lighthouse is of architectural significance as a notable example of a purpose-built structure housing a navigation aid.  The tall imposing tower has architectural quality and is a dominant feature of the maritime landscape of Middle Harbour, particularly when viewed from the direction of the Heads.  It has visual unity with Grotto Point Lighthouse.

Glebe Island Silos Victoria Road Glebe Island

Glebe Island Grain Terminal is a seminal site in the development of the bulk wheat storage and export industry in Australia. As such it has a pre-eminent position in the historical development of one of Australia's most important primary industries. It was the first and most important of the port terminals and encompassed technologies that were specific to the industry and influential in the development of that industry throughout the country. The first construction phase is particularly noteworthy because of the circumstances of its wholly imported design and technological expertise.

The carefully planned and integrated system, by the 1930's, was considered to be one of the largest, most efficient and well planned installations of its type.   The fabric contained within the site, although compromised by alterations and missing elements is capable of demonstrating and recording the evolution of the industrial processes that evolved over several decades. The silos, in particular are the most visible and easily interpreted elements of that former use and form a powerful and well known landmark. The site also has significance for its associations with, and demonstration of, Commonwealth and State government initiatives.