A new report claims building affordable apartments in the city isn't commercially viable.
The Society of Chartered Surveyors says a two-bed medium-rise apartment costs a developer between €470,000 to €578,000 to build.
Building costs for lower rise apartments in the Dublin suburbs start from €293,000.
The society says building a three-bed apartment is now more expensive than building a three-bedroom house.
Paul Mitchell was one of the authors of the report.
"Height is terms of very high-rise or tall buildings isn't really the solution.
"The higher that you build, the more expensive it costs.
"Buildings become less efficient, you have to spend a lot more money on structure and the facades".