388
Opinion of the Court
spaces for walking and/or bicycling . . . remove potential vehicles from streets, resulting in an overall improvement in total transportation system flow." A. Nelson, Public Provision of Pedestrian and Bicycle Access Ways: Public Policy Rationale and the Nature of Private Benefits 11, Center for Planning Development, Georgia Institute of Technology, Working Paper Series (Jan. 1994). See also Intermodal Surface Transportation Efficiency Act of 1991, Pub. L. 102-240, 105 Stat. 1914 (recognizing pedestrian and bicycle facilities as necessary components of any strategy to reduce traffic congestion).
B
The second part of our analysis requires us to determine whether the degree of the exactions demanded by the city's permit conditions bears the required relationship to the projected impact of petitioner's proposed development. Nollan, supra, at 834, quoting Penn Central Transp. Co. v. New York City, 438 U. S. 104, 127 (1978) (" '[A] use restriction may constitute a "taking" if not reasonably necessary to the effectuation of a substantial government purpose' "). Here the Oregon Supreme Court deferred to what it termed the "city's unchallenged factual findings" supporting the dedication conditions and found them to be reasonably related to the impact of the expansion of petitioner's business. 317 Ore., at 120-121, 854 P. 2d, at 443.
The city required that petitioner dedicate "to the City as Greenway all portions of the site that fall within the existing 100-year floodplain [of Fanno Creek] . . . and all property 15 feet above [the floodplain] boundary." Id., at 113, n. 3, 854 P. 2d, at 439, n. 3. In addition, the city demanded that the retail store be designed so as not to intrude into the green-way area. The city relies on the Commission's rather tentative findings that increased storm water flow from petitioner's property "can only add to the public need to manage the [floodplain] for drainage purposes" to support its conclusion that the "requirement of dedication of the floodplain area on
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