Do affordable housing communities ever become normal housing communities? and if so how?

[Andrew Nesbitt]

So say there is a condo community that is affordable housing where the condos sell for about $170k.  Basically its income restrictions that keep these condo prices low as if it wasnt income restricted, these condos would be worth about $100k more.   Sometimes investors can buy these, but they have to be on the market for a long time (90 days i think) But I was wondering if these communities can ever lose their status as affordable housing and if so how does that work?  Does it just become a regular community after so many years, or what?