But 84/33 Mount St escapes that limit because it is a bedroom in a larger complex where facilities are available.
"It's the smallest I've sold," Mr Mo said.
It could take only a single bed, and could rent for $160 to $180 a week.
Although the dwelling is only a bedroom, it is on a floor with four bathrooms - two men's and two women's - and four toilets, he said.
Downstairs was a common area kitchen and Mr Mo said arrangements could be made with the building manager to use cooking facilities.
The building's residents were Asian, South American and Indian, he said.
Two years ago, dwellings in the building occupied by many AUT students were selling for about $35,000 to $45,000 each, he said.
GO NO SMALLER
Auckland apartment rules, minimum sizes
* Studio - 35sq m
* 1 bedroom - 45sq m
* 2 bedroom - 70sq m
* 3-plus bedroom - 90sq m.