The 146-year-old Victorian building, once a synagogue and later a freemasons' temple, was converted into two apartments and the Temple Gallery about 20 years ago.
The two-storey 960sq m building is now designated mixed-used residential and commercial. The art gallery has potential for conversion into a retail site or cafe. It has capital value of $460,000.
An auction by Harcourts, scheduled to close today, has been extended to March 6.
The building opened as a synagogue in 1864, making it the oldest synagogue in New Zealand. It was expanded in 1872 by architect David Ross, then converted in 1881 to a masonic hall, which it remained for the next 111 years.
The building was bought in 1992 by husband-and-wife developers and art dealers Peter Duncan and Victoria Timpany.
