Chart shows that Philadelphia, Allentown and Erie all require that landlords register their rental housing properties. Philadelphia charges landlords an annual fee of $56, Allentown $75 and Erie $40. Allentown aims to inspect each unit every five years, Erie every two years, and Philadelphia does not systematically inspect every unit. Pittsburgh has no registration, no annual fee and no systematic inspections.
Philadelphia program: https://www.phila.gov/services/permits-violations-licenses/get-a-license/business-licenses-permits-and-approvals/real-estate/get-a-rental-license/. Allentown: https://www.allentownpa.gov/Building-Standards-Safety/Housing-Office Erie: https://cityof.erie.pa.us/residential-rental-registration/