In Boston at least--if things go according to a plan recently released by the Walsh administration that calls for an investment of 20 billion dollars over the next 16 years to build 50,000 housing units. If I was in some other line of work, or in a different part of the world, I'd loudly proclaim the great cost of this idea. Such a sum of money could only pay for about 15 F-35 warplanes. I'm not sure what will get built first, either.
Based on housing start trends over the last 10 years, this is an achievable goal--especially if you include surrounding urban areas.