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.

Break down your rehab into individual jobs, for example get a electrician for electrical work, a plumber to repipe the house, a dry wall guy to close out the walls, etc.

Quote from @Austin Schubert: Quote from @Chris Seveney: Quote from @Austin Schubert: Would anyone have a sample template of a proposal that you've used in the past that goes over how your structure a deal with a private money individual? 

Unless you live in area that has many ADUs already built that have been sold with the home or as individual parcels.

@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.

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

The home sold for 135k to an individual using a VA Loan.

@Jerry ZhangThis is not your ideal seller financing individual.

While my insurance charges are relatively low each year given this is a condo, I learned to better assess who is behind budget planning at the HOA level for all of the units for roof, cleaning costs, basement improvements (shared by all units), given this was run well by one individual.