Black Point is an estate on the south shore of Geneva Lake in Wisconsin, built in 1888 as a summer home by Conrad Seipp, a beer tycoon from Chicago. From the roof to the railings on the porches, Cullen did a total restoration of the entire exterior of the building as well as new steps leading down to the lake.

The Queen Anne style mansion features a nautical-themed, four-story, "crow's nest" observation tower, which can be seen from many points on the lake; the property also features post-civil war-era furniture. It is included in the National Register of Historic Places.
The state of Wisconsin owns the property and leases it to the Black Point Historic Preserve, a non-profit organization which manages the property for public tours, which began in June 2007.

The estate and its grounds, including 620 feet of shoreline, are protected from future development by a conservation easement co-held by the Geneva Lake Conservancy, a local not-for-profit conservation organization, and the Preserve.