Expand Housing Opportunities Act This bill establishes new, and expands existing, grants for increasing the availability of affordable housing. Specifically, the bill sets up grant programs that support (1) construction, preservation, or rehabilitation of owner-occupied, affordable housing; and (2) implementation and administration of landlord-tenant mediation programs. Further, the bill allows states to apply for additional funding through a block grant that supports affordable housing activities that benefit low-income individuals (the HOME Investment Partnership Program) to cover certain costs associated with affordable housing incurred during the COVID-19 emergency.