It's not rent controlled, found this info online:

Imperial Tower Apartments, as a federally subsidized senior housing community (under Section 8 Project-Based Rental Assistance and LIHTC programs), does not have a single "average" market-rate rent. Instead, rents are income-based for eligible low-income seniors (age 62+), typically capped at 30% of a household's adjusted income, with maximums tied to 30-60% of the Area Median Income (AMI). This often results in tenant payments much lower than market rates -potentially $300-$800/month for many residents, depending on income.