The concern about selection and use of assumptions is true for other valuation tools as well, such as those used to determine the value of an existing asset for potential brownfield concessions. The NW Financial Group conducted a review of both long-term lease agreements for the Chicago Skyway and the Indiana Toll Road, concluding that the public sector could have generated as much revenue as the private sector (Buxbaum and Ortiz 2007; Enright 2007). The analyses for both projects included key assumptions, such as periodic toll increases, that are uncommon and politically difficult under public ownership. Similarly, a Pennsylvania Turnpike valuation (Foote et al. 2008) showed that public monetization would provide the best value ($26.4 billion for Act 44 compared with $14.8 billion for a 50-year asset lease), assuming that tolls are applied on I-80, which is an assumption that carries a very high risk. Later, a private offer for the Penn-sylvania Turnpike actually yielded $12.8 billion for a 75-year lease, which is about $2.0 billion less than Foote et al. estimates, for a longer lease term, which might be the result of current market conditions.