America Solution Center provide excellent resources to serve program staff who are motivated to learn building science principles and applications. Eight "lessons learned" presented in the conclusions provide recommendations for local governments and nonprofit affordable housing providers on incorporating the best practices into master specifications for community-scale deep retrofits. These lessons, combined with the refined best practices documented in Appendix A, provide guidance for program managers striving to achieve deep retrofit goals in the context of a foreclosed home renovation in pre-energy code era homes.