Partners for Good Housing: The City of Philadelphia, on behalf of its citizens, has set minimum health, safety, and maintenance standards for houses and apartments.  Keeping the housing in our city up to these standards involves a partnership between tenant, landlord, and the City.  All three must work together to provide decent housing for everyone. “Partners for Good Housing” outlines the responsibilities of owners, tenants, and landlords for maintaining houses and apartments in a safe and clean condition.
Partners for Good Housing - City of Philadelphia

Lead Warning Statement: Housing built before 1978 may contain lead-based paint. Lead from paint, paint chips, and dust can pose health hazards if not managed properly. Lead exposure is especially harmful to young children and pregnant women. Before renting pre-1978 housing, lessors must disclose the presence of known lead-based paint and/or lead-based paint hazards in the dwelling. Lessees must also receive a federally approved pamphlet on lead poisoning prevention.
Protect Your Family From Lead in Your Home - EPA
Tenant Lead Flyer - City of Philadelphia

Fair Housing Act: Title VIII of the Civil Rights Act of 1968 (Fair Housing Act), as amended, prohibits discrimination in the sale, rental, and financing of dwellings, and in other housing-related transactions, based on race, color, national origin, religion, sex, familial status (including children under the age of 18 living with parents or legal custodians, pregnant women, and people securing custody of children under the age of 18), and disability.
More information available at HUD.gov