Trade Me's predicting increasing pressure on rental property owners.
The Trade Me Property analysis for the final quarter of 2012 shows plenty of supply - but weakened demand in almost all regions.
Spokesman Brendon Skipper says Auckland city showed the biggest drop, down by 28-percent in the CBD.
He says flat asking prices and double-digit house price increases are causing rental yields to rapidly decline marking a return to the conditions observed during the last rental boom.
Mr Skipper says market conditions will continue to place downward pressure on weekly asking rents.
Christchurch continues to buck the trend.