Municipalities have several tools to help them make infill projects more attractive to developers; tax incentives (which may have limits) and federal and state enhancement grants to improve existing infrastructure, but there are also other sources of funding such as Tax Increment Financing. Making it easier for developers to do infill projects is as simple as making it make economic since to them, right now it is hard for infill projects to compete with greenfield developments, but I think the data suggests that the economic viability of infill projects will continue to increase over the next decade as more consumers start looking for these types of products.