Using a TIF to subsidize affordable housing

From City Observatory:

Portland’s tony Pearl District, adjacent to downtown, as blossomed in the past decade, adding more than 7,000 new residential units, plus offices and stores. The city’s policy has plowed tens of millions of dollars in the tax increment from new construction and rising property values into affordable housing in the neighborhood.  That funding, coupled with other resources, has supported the construction of 2,200 units of affordable housing, interspersed with market rate units.

2,200 affordable units! That's astounding.