There's no one universal model for these policies, but they generally involve one of two things: a requirement that developers either make a
certain percentage of their housing units
available at below - market
rates, or that has them pay a fee into a fund for affordable housing.
As an example, loans provided
at generally prevailing interest
rates are not gifts, but a judge could not accept a loan from a financial institution
at below - market interest
rates unless the same
rate was being made
available to the general public for a
certain period of time or only to borrowers with specified qualifications that the judge also possesses.