Mr Platter wouldn't provide exact figures for reasons of commercial sensitivity, but he spoke out on the benefits of foreign investment, saying it was responsible for "so much wealth and prosperity at the moment".
"International buyers have been really good for New Zealand, bringing billions of dollars of investment and relayed spending to the economy."
His comments come after the Labour Party released leaked figures over the weekend showing people with Chinese names were snapping up real estate in Auckland at a rate far and above their proportion of the population.
Labour has since faced allegations of playing the political race card, while it calls on the government to introduce a foreign buyers register.
Mr Plattter said he was unsure if the debate in New Zealand had caused Chinese buyers to think twice about investing here.
"I haven't talked to the call centre about this issue this week, but I think, based on past experience, that it probably hasn't made much of an impact yet.
"Usually they respond to changes in policy unless there's something pretty awful."
Juwai.com also tracks buyer activity through its site, measuring information such as referrals to agents and checking listings, and found New Zealand had jumped from number 12 to number five.
But Mr Platter cautioned against reading too much into this, because countries moved around all the time.
For example, Singapore sat at number five a year ago and was now in 10th position after changing its foreign buyers' rules.