This may include, but is not limited to, property type (duplex vs. tri/quadplex vs. commercial), price range (max price), location (zip code), condition (Class A-D) and profitability.Good luck!

Not knowing if there are tenants or if it is empty, the condition, if there are any code violations existing, if you are assuming a company name that holds the property and if so, the standing of that entity as well as contingent liabilities, what kind of municipal requirements there could be like registration as a landlord in that jurisdiction, or of any other details, I really can't tell you what you need to do first.

These are professionals with additional training and a stricter code of ethics.

The 4-plex needs work to get up-to-code, while the duplex is actively rented (both sides).

Depends strictly on the numbers.

There are hot/in-demand areas within that area code, but buying a property at a low enough cost to have room for immediate return is going to be tough. 

Half of the ZIP codes across the Philadelphia market area recorded an Index in the High category in June while one-third were in the Moderate or Steady category.

With Fannie/Freddie, every lender has to follow those rules....I mean, they could be MORE strict...but they at least have to follow the minimum.  

And then its not strictly a RE book but "fix this next" was amazing.

If you want to do some research on your own from the Lawmakers, start here:IRS - Retirement Plans Published Guidance   (Code, Notices, Advisories, etc.)