Many states have programs for public building and spaces, like 1% for the Arts, specifically granting monies to artists or organizations with the intention of creating public art for new or renovated construction. More than ½ of the states and provinces that are part of the USA have these programs including: Alaska, Colorado, Connecticut, DC, Guam, Hawaii, Illinois, Iowa, Louisiana, Maine, Maryland, Massachusetts, Minnesota, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, Ohio, Oklahoma, Oregon, Rhode Island, South Carolina, Texas, Utah, Vermont, Washington, Wyoming.
Good places to start researching whether or not your project qualifies for these programs are at Americans for the Arts, National Assembly of State Arts Agencies and National Endowment for the Arts program websites. You can also apply for grants (most due in February). Here are some links to get you started.