; or any territory or possession of the United States: Provided further , That grants awarded under the preceding three provisos shall not be subject to a minimum grant size: Provided further , That the Secretary may use up to 20 percent of the amounts made available under this heading for the purpose of paying the subsidy and administrative costs of projects eligible for Federal credit assistance under chapter 6 of title 23, United States Code, or sections 501 through 504 of the Railroad Revitalization and Regulatory Reform Act of 1976 ( Public Law 94–210 ), if the Secretary finds that such use of funds would advance the purposes of this heading: Provided further , That in distributing amounts made available under this heading, the Secretary shall take such measures so as to ensure an equitable geographic distribution of funds, an equitable distribution of funds between urban and rural areas, including Tribal areas, and the investment in a variety of transportation modes, including public transit, passenger rail, and pedestrian improvements: Provided further , That a grant award under this heading shall be not less than $5,000,000 and not greater than $25,000,000: Provided further , That not more than 10 percent of the amounts made available under this heading may be awarded to projects in a single State that are not port infrastructure investments (including inland port infrastructure and land ports of entry): Provided further , That the Federal share of the costs for which an amount is provided under this heading shall be, at the option of the recipient, up to 80 percent: Provided further , That the Secretary shall give priority to projects that require a contribution of Federal funds in order to complete an overall financing package: Provided further , That an award under this heading is an urban award if it is to a project located within or on the boundary of an urbanized area, as designated by the Bureau of the Census, that had a population greater than 250,000 in the 2010 decennial census: Provided further