Yes. That's for the median-income owners. That's a study done in 12 large American cities by Evan Mast. I can send it to you. Then it's 17 for the very last quintile of earners.
In Helsinki, there was another study that's even more striking. In that case, it was houses built at market prices, and not only luxury units, which is the extreme example of the Mast study. In the one in Helsinki, for each 100 units built, 66 units were made available for people below the median income, and 31 for the very last quintile.