The clients' deposits were in a trust account and would be refunded.
The original developer had been aiming at first-home buyers when launching the project earlier this year.
The townhouses were to have been built in a loft style, designed to maximise the space with a 4m stud height in the living area.
David Hamilton of the original development company Celt Saxon Corp was unwilling to go into detail about what had happened, saying it was still a bit raw and upsetting.
He said they had an unconditional contract to buy the property but their finances had fallen over.
They had been negotiating with another party to take over the project when he found out last Tuesday that this party had gone directly to the landowner with another offer and was now doing their own feasibility study.
"The guy may go ahead with a similar style of development but I don't know."
Mr Hamilton said they had been overwhelmed with interest from potential purchasers when the development was announced, although it did not always translate into a sale.
There were a lot of constraints and it had reached the stage where they were in negotiations with all the parties, including the new purchaser, to make it happen.
"We are bitterly disappointed we did not make it happen," he said, adding that it had been taken out of their hands to some degree.
"We did what we could to make it happen ... now it is someone else's turn," Mr Hamilton said.