You can also look on the city's website under their construction code.

That should be used as supporting evidence that your building IS a two family and that the City knew about it, etc.A good Expediter will be able to help you give the right evidence and put together a package to submit to the DoB.

I have the land and am working through the process with the civil engineers and the city.

Which markets (Cities, States, Counties) are producing the highest cash flow while keeping purchase prices under 100K?

If it's in a major city with public transit you can limit the number of rooms that include parking.

Seller's make claims all the time.... you can build up to 12 units on this land, you can subdivide this into another parcel, rarely are these true if you call the city and do some legwork. 

State, County, City rules and regs every one is different.

I specialize in the city of Charlotte though, but I'd love to refer you to a good contact in Raleigh if you are interested please PM me!

I have connections with great vendors throughout the city and actively search for deals and present them to investors. 

Philadelphia as a city is nowhere near saturated, but you aren't buying the city.