Building usage and technology are changing the property landscape. At the commercial end of the market, there is a need for value creation for fully realizing building potential. The need for metrics to assess usage, functionality and efficiency are also driving the need for more intelligent buildings. This means multiple networks, coordinated via IP, can add significant functionality and feature sets to building users (companies, individuals). Given the cost reductions possible with coordination of networks, one might then say that relational control is only possible in an IP world. But the cost/benefit of coordination means that there are different ROI points for stadiums than for everyday office buildings or apartment complexes. Unfortunately, the only data in the public domain tends to be about intelligent stadiums. So someone starting the business of retrofitting a complex has to deal with an ROI estimate that is nebulous, at best. (Although an article by Paul Ehrlich in AutomatedBuildings.com has a nice calcuation in its May 2006 edition). However, to be of assistance, several software vendors have made ROI a feature of their systems integration services.