BSA's can be funded with private capital from one of the owners, limited partners, or family.
A BSA can also with funded with life insurance or annuities.
Which method of funding is appropriate depends on an analysis of all factors. For example, life insurance maybe too expensive for some persons due to age or illness. Also, a small business loan maybe the right choice to provide liquidity and establish credit with a financial institution.
Check out the following book:
http://ria.thomson.com/EStore/detail.aspx?ID=PSBSA