If you location requires a certificate of occupancy before someone can live there, you will need to get the proper permits and finish up the inspections to get the COO.

@Travis ThorntonYou should check with your insurance professional and possibly have a lawyer review all of your policies.With that being said your property management agreements should state that all property owners add you as an additional insured to each property confirmed through a certificate of insurance (COI).

Maybe they will accept a re-certification report from the original appraiser.

Then with your license on hand go to Philadelphia. gov and find get a "certificate of rental suitability".Punch in your inf. like mailing address and rental licenses number and voila you can print your certificate of rental suitability. 

@Priya Thomas Yes, you can purchase unsold tax lien certificate from township.

Owner shall deliver certificates evidencing such insurance coverage to agent at execution of this management agreement.

Lead certification fee if you rent property to anyone with a 6y.o kid and younger. 

Total purchase price, down payment, amortization of loan, estimated repairs, will the repairs be included in the loan, closing costs, will they be included in the loan, breakdown expenses into: taxes, insurance, repairs, utilities, reserves, legal fees like certificates of occupancy or rental permits, and anything else. 

Hi, thank you all for the replies, I found the statue:197.432 Sale of tax certificates for unpaid taxes(13) The holder of a tax certificate may not directly, through an agent, or otherwise initiate contact with the owner of property upon which he or she holds a tax certificate to encourage or demand payment until 2 years after April 1 of the year of issuance of the tax certificate.(14) Any holder of a tax certificate who, prior to the date 2 years after April 1 of the year of issuance of the tax certificate, initiates, or whose agent initiates, contact with the property owner upon which he or she holds a certificate encouraging or demanding payment may be barred by the tax collector from bidding at a tax certificate sale.

- If I were buying a place with poor records and no leases, I would require an "Estoppel Certificate" from every current tenant.