Its a great idea but they should give an incentive to include the affordable units like a density boost, such that the affordable units do not count against the scale of the building. A 5th floor in an area with a 4 floor limit would allow them to get more money out of the same project for a relatively small increase in construction costs. Once you are already buying a site, designing a building, going through the approvals process, getting financing, and actually constructing the building with all of its mechanical systems, the cost of actually building one additional floor is minuscule.
If the developers are not given any incentive at all, I predict a lot of 29-unit buildings coming up, as the change only affects developments with 30 or more units.
Overall, it is necessary, as the developers only seem to be interested in building $1500-$2000 units while affordable units need to be about $1000 or less. The city has enormous amounts of affordable housing, but much of it is old and decaying, and there is an astronomical waitlist for affordable housing, with 25,000 applicants for 8,000 or so public housing units. If the private developers can provide the units themselves, it will reduce the load on the NHA.
What are people's thoughts about the affordable housing set aside bill that the Council will vote on tomorrow ? I was surprised to receive a mailer about it -- maybe it's intended more as a reminder to voters that Baraka is behind it (?)