Sunnyside House is a fine example of a Federal-period farmhouse. The three-story, 10,000 square foot house includes later additions and changes made during the 19th and 20th centuries. Its Flemish bond brick walls, coarse-rubble limestone foundation and wood cornice with simple medallions identify the oldest part of the house. A later addition is of mixed-bond brick construction on an uncoursed limestone ashlar foundation, with a cornice designed to match the original section. Tall bay windows were added during the Victorian era, followed by two brick porches with wrought iron railings in the 1940's. The setting consists of a spacious lawn with gardens, walks and large trees, in addition to several large dependencies.  

Sunnyside House is on the National Register of Historic Homes. All of the furnishings being used in Sunnyside House have been donated by Kendal residents, family members and friends of Kendal.  One piece, an armoire, was in the house when the Andersons, the former owners, resided there.  The Sunnyside Furnishings Committee, headed by Beth Thompson, former Board chair and now Kendal resident, has been collecting donations over the years and has been able to completely furnish the house through these donations.

Sunnyside House offers a library/reading room, two parlors and dining room on the first floor.  There are four guest rooms on the second floor, along with a dry arts room.  The terrace level features a woodworking shop and model train room.  Sunnyside House will be used for Kendal resident activities as well as guest accommodations for friends and family members.