Harvard Business Review reports on a clever sustainable business strategy by Dial 1298 providing ambulance services to previously unserved areas in Mumbai, India. The venture is structured using a clever hybrid approach wherby a non-profit foundation owns the ambulances and other assets which it rents exclusively to the for-profit Dial 1298 on a per use basis.
This structure allows Dial 1298 to operate profitably with very low overhead, while the non-profit structure of the foundation allows it receive donated ambulances and other significant philanthropic support.
Although the IRS may take a close look at such structures if formed in the U.S., I think this sort of thing can and will work here as well. IMO, this sort of hybrid structure offers a lot more flexibility and lot less compromises than the Low Profit Limited Liability Company (L3C).