Project Row Houses is positioned as a neighbor, as a partner, as a developer, as a social services provider and, most prominently, as a unique lens magnifying the community’s hidden treasures in ways often unexpected.
Keeping in mind the limited resources of struggling cities, I wonder if you could create partnerships with university students to provide guidance to startups that need help with their financials or legal issues. Harvard has a law and entrepreneurship project (http://www.hlep.org/) through which law students work with attorneys to provide legal guidance -- it not only provides the startups with pro bono advice but gives students a valuable opportunity to apply their skills outside of the classroom.
I also agree that opportunities for training or mentorship are key, particularly to encourage early-stage startups to persist in their ventures. I don't think it would necessarily have to be funded by the City but on a voluntary basis. You could perhaps reward those volunteers in simple/cheap ways, such as an acknowledgements board in the hub or recognition on its website?