In Austin, Texas, the increase in the value of homes adjacent to a greenway in three studied neighborhoods adds up to an estimated $27.28 million. The actual economic value of the greenway is likely much higher, as the calculation does not include homes that are near, but not adjacent to the greenways, nor does it include all neighborhoods proximate to the greenway.
Nicholls, Sarah, and John L. Crompton. (2005). The impact of greenways on property values: Evidence from Austin, Texas. Journal of Leisure Research, 37, 321-341.