HUD's Charlesview memo

When talking about a diverse, new Charlesview with housing for people at all levels of the income spectrum, one rebuttal that we have heard is that "HUD won't allow" more work-force (80-120% of median income) and market-rate housing to be integrated among the affordable (<80% of median income) apartments.

I am no expert in the United States Housing Act of 1937, but I see nothing in here that would prohibit Chalresview from becoming a more diverse community consistent with the HUD programs that promote mixed-income housing.
HUD Charlesview memo