My contractor has one credit card for all of my individually owned buildings (jointly not multiple cards) and one credit card for the building I own in a partnership.

The buyers need (not request) a full 5%-6% seller assist and become complete menaces and eat into your margins with lengthy repair addendums following inspections. 

I want to understand all fee structures to assist in the income reporting analysis.

My best advice would be to read through the contract carefully (builders usually have their own individual contract that's written for them and is leaning heavily in their favor).

@Jordyn Gegg - I have a PM company that oversees all of my individual LLCs.

Quote from @Brody Veilleux: As far as I’m aware, FHA loans are only for individuals.

What kind of attorney can assist with this case?...

If individuals and/or LLCs are the beneficiaries, then it is doable. 

i do think it's challenging, though, for a brand new investor with zero experience to jump right into a huge rehab with a contractor they've never worked with before.the contractor might want a larger up-front payment to mitigate their own risk, and they're not going to be interested in any kind of fancy nonsense like a 'penalty' when they know a new investor has never managed a large project before.i have also found that some contractors, including reputable ones, don't even want to share itemized bids because they just don't want to have to argue about the individual line items. 

I also have experience with expeditors who can assist in obtaining required docs and can recommend a few to you as well, if needed.