The country's biggest listed property investor has posted a 27 per cent gain in first-half profit and announces further plans to upgrade Sylvia Park.

Profit for Kiwi Property Group was $45.6 million in the six months to the end of September from $36m a year earlier, the Auckland-based company said. Total income including revenue from property rose 6.7 per cent to $114.8m even after the year-earlier period was bolstered by $5.9m of litigation settlement…