Of the three remaining building complexes at the Santanoni Preserve, only the Gate Lodge is accessible by motor vehicles. Located just off NY-28N, this complex today encompasses a few remaining buildings from the Pruyn era: the Gate Lodge, a small boathouse on the shore of Harris Lake, a pole barn and the West Cottage (c. 1850s) which was built before the Pruyns bought the property.

There are also a few modern additions to the Gate Lodge complex, including public parking, privies and a New York State Department of Environmental Conservation (NYSDEC) shop.

The Gate Lodge was designed by New York-based architectural firm Delano and Aldrich, and was completed in 1905. Although not known for rustic architecture, Delano and Aldrich specialized in design that incorporated the surrounding landscape.

The building was originally sited to frame the view of the high peaks within the stone arch. The road traveled through the arch before winding back around to its present configuration. Today, the forest has reclaimed much of the open space that allowed for the mountain view, however, a short walk to the boat house on the shore of Harris Lake provides a good example of how the view would have looked at the turn of the 20th century.

Today, the Gate Lodge is used as housing for DEC staff and for the Santanoni interns during the summer months. There is a small visitor center with exhibit and gift shop space located under the stone arch. The rest of the building is closed to the public except during special tours.