About the Open Space Institute The Open Space Institute (OSI) is a national leader in land conservation and efforts to make parks and other protected land more welcoming for all. Since 1974, OSI has partnered in the protection of more than 2.5 million at-risk and environmentally sensitive acres in the eastern U.S. and Canada. OSI’s land protection promotes clean air and water, improves access to recreation, provides wildlife habitat, strengthens communities, and combats climate change, while curbing its devastating effects. OSI has an operating budget of $66 million, of which $36 million is derived through philanthropy, and is engaged in several multi-year campaigns and initiatives to su