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While sales remained steady for lower-priced homes, there were still very few sales at the upper end of the market, she said on Thursday.
Reinz figures for April released on Thursday showed the median price in Dunedin was $255,000.
Over the past year the monthly median has ranged from $235,000 to $260,000.
Mrs Nidd, who had access to more detailed figures about the types of properties sold each month, said 30.6% of properties sold last month went for less than $200,000, while only 7.6% changed hands for more than $500,000.
"Believe it or not, there were four sales for less than $124,000; and we are talking land with houses of some description on them, not bare sections.
"Another 14 properties sold for between $125,000 and $149,000."
Continuing low mortgage interest rates were attracting first-home buyers and some investors to the market, Mrs Nidd said.
In Queenstown, 50 sales were recorded last month and the median price was $640,000, $195,000 higher than in March.
Reinz Queenstown spokesman Kelvin Collins said last month had appeared to be a busy one and he was surprised the total number of sales was not a little higher.
Queenstown agents had also seen "good interest" from first-home buyers and investors.
Most of the investors were from Otago and Southland and they were looking for homes or duplexes, rather than apartments.
The median price had most likely been pushed up by stronger interest in top-end properties costing between $2 million and $3 million, he said.
"It is the middle sector, family homes of between $600,000 and $900,000, where things have been a bit boring; where there has been no lift in volumes or prices."
Residential property values in Dunedin had dropped back 1% in the past three months, after rising 4.5% in the five months before that, valuation company QV said.
The average sale price for the three months to the end of April was $265,099, its statistics released on Thursday showed.
Values across the city were now 2.7% above the corresponding time last year and 5.1% below the 2007 market peak.
Values for the year to the end of April increased 1.7% in Waitaki, 2.4% in Central Otago, and 1.7% in Gore, but dropped 0.3% in the Queenstown-Lakes district and 2.6% in Clutha, QV said.