). Historically, the business model driving library systems has relied primarily on public sector sources such as sales and property taxes, bonds, grants and contracts, city/county budgets, etc. Daunting new times are challenging libraries to evolve this business model, with the need to augment these funds with contributions from the private sector seeking donations from individuals and institutions. The fact is, these private sector funds are available to causes with a strong case. But the means to compete successfully for these funds requires building a strong and independent non-profit Foundation, and then rallying every segment of the library family around a new Culture of Philanthropy. Sonoma County Library system has recently gone through such a transformation, gearing up to meet system-wide needs for renovation and new construction. This presentation will share lessons learned in that process, as well as “best practices” to bust myths that stifle participation in fundraising efforts.