The key recommendation is to first of all recognize that financialization is systemic and pervasive, and it will require a coordinated approach to curb the harm that it's causing. It will require immediate actions, followed by longer-term, ongoing strategies.
There is the tracking of ownership of financialized housing stock and measuring the impacts of financialization. There is better monitoring of tenants' rights before, during and after the acquisition of property to prevent evictions, human rights violations and harassment. There is expanding the supply of non-market housing and developing mechanisms to definancialize ownership. Suspend state subsidies and support to financialized landlords. Bring in tax reforms that make financialization less profitable, especially for REITs, and regulate the involvement of pension funds that invest in financialization.
All of that is in the purview of the federal government.