Those extra profit come from properties revaluation. Under the reits listing rules, reit properties can be revalued for every 3 years in order to better reflect the properties price and reit situation.

So properties price is higher than 3 years ago, then the incremental in book value of the properties will be registered under exceptional profit.

But to see the actual situation and yield condition of the reit, look for the operating profit or net rental income.