Questions about Land purchase and Development

[Jorge Lee]

Hi everyone, I'm interested in land development in Philadelphia and have a few questions. I have some experience in multi-family fix and hold but am new to new construction (ground up). 

I'm considering purchasing a vacant land in 19123 and would appreciate your guidance: 

1. Where can I find detailed zoning information (beyond just the code, such as max building height, maximum percentage for building size, etc.)? The current code is CMX2. 

2. What is the purchase process for vacant land? What should I be careful about compared to buying an existing property, and are there any key differences? 

3. How many permits do I need to apply for a commercial project, and how many plans will I need from the engineer? 

4. I plan to hire a general contractor but would like to understand the basic process. Can anyone briefly describe the steps involved in building from the ground up? 

Thank you in advance for your help! Your insights will be greatly appreciated.