[4] The new building was designed by Benjamin Cowser in the modernist style, built by F. B. McKee & Co. of Belfast in red brick with concrete dressings at a cost of £8,000, and was officially opened by Lady Craigavon on 30 May 1935.

On the first floor, there were five casement windows and a wide cast iron balcony, flanked by single blind panels on either side.

[7] It was refurbished in 1973 and the cast iron balcony on the front of the building was replaced by a large concrete frieze inscribed with the words "Portstewart Town Hall" in 2000.

[1] As well as accommodating the local public library, the building became home to the Big Telly Theatre Company and went on to become a popular community events venue,[8] although the Big Telly Theatre Company relocated to the Roe Valley Arts & Cultural Centre in 2015.

[9] In 2019, after a structural survey revealed that the building was unsafe, the unitary authority, Causeway Coast and Glens Council, refused approval for the repair expenditure.