The City of Phoenix has all sorts of contracts with residential properties. Part of the agreement, usually, is that since these properties are accepting GPLET, then they must provide so many units of affordable housing. Affordable housing is considered 80% of the median income level (according to HUD). Some properties, because they are unaware or simply because they do not want to, fail to comply. Thus, the City has to check in with these developments once in a while to ensure they are preforming their part of the contract. If not, we tell them they must comply with the next vacancies.
Affordable Housing, as stated, is calculated by taking the average income level (according to HUD), which I think is about 33,000 (again, just a vague memory) and then take 80% of that, which I think is around $26,400. Thus, in order for a family to qualify for affordable housing, they cannot pull in more than that. Afterward, take 30% of $26,400, which is circa $800, and that is the maximum the family can pay for their apartment. Of course, the number of people in the family is taken into consideration-- legally, they have to. You cannot stick 5 people in a 1 bedroom apartment. Thus, residential developments on GPLET are typically expected to provide a certain percentage, or a set number of units, of affordable housing (it depends on what the contract states).
Part of my job as an intern was to help one of our Assistant Program Managers ensure one of the residential developments was in compliance with the law, which they were. Every step we took with this issue, we had to check with the City lawyer who is assigned to our department (her speciality is real estate law). Overall, the process was very enlightening, and very fulfilling. I tell you, I have learned a lot about legal processes through this internship-- I kinda feel like I have completed at least a semester at law school-- without having to deal with the egos, and all of the books, and the late-night studying-- alright, maybe it's nothing like law school, but I learned a lot.