development and the use of transportation investment to encourage such development need to be evaluated at least in part from a private investment perspective, with an understanding of the factors that can influence development decisions [Witherspoon. 1979: US. Department of Housing and Urban Development. 1979: U.S. Conference of Mayors, 1980]. Such coordinated transportation and private investment planning characterizes many joint development projects found throughout North America (Cervero et al., 1991]. In such projects, private sector interests play key roles in the implementation of the development proposal and in defining the desirable characteristics of the complementary transportation investment.Fourth,the land-use impact of transportation investment tends to involve changes in the spatial distribution of activities within a metropolitan area. both in terms of the location of new development and changing property values. A major investment in transportation infrastructure seldom creates a net increase of development within a metropolitan Regional transit investments have a tendency to reinforce already existing decentralization trends, while still having the potential of strengthening the downtown core . Experience in San Francisco; Washington, D.Ci; Toronto: and Baltimore shows this combined effect.