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The award went to Denise Grant in a random draw, as more than 10% of the entries opted for the name or a variation of it.
''I came across old plans and saw it has always been known as 'the Langlands block' so I felt it was a fitting name which paid tribute to the history of the area,'' she said.
The site honours the architect and justice of the peace Scotsman William Langlands, who developed the land in the mid-1800s.
ILT chairman Alan Dennis said the board was unanimous in its support.
''It's fantastic such a significant building for Invercargill's future has a nod to our past heritage.''