An expansion to White River State Park adds another 13 acres to an urban living room that, today, measures 267 acres. The expansion both adds wiggle room to the park and helps safeguard Indianapolis, Indiana from flooding.An expansion to White River State Park will add 13 acres to the urban living room that, today, measures 267 acres. The project is by DAVID RUBIN Land Collective and Rundell Ernstberger Associates (REA).