Its centerpiece is a four-story brick mill building with an Italianate tower, built in 1856.

The property also includes a dam impounding the adjacent Pootatuck River, a mill pond, and a hydroelectric power generation facility.

[1] The complex was renovated into an office building in 1980[3] named Rocky Glen Mill.

A notable occupant in the late 1980s was Stepstone, which created the Objective-C programming language.

This article about a property in Connecticut on the National Register of Historic Places is a stub.