Windsor mansion was constructed as a three-story block, consisting of a ground floor basement, with living quarters on the second and third floors. The main block was 64 ft on each side. A three-story ell projected from the east side of the main block. The ell measured 59 ft  by 26.5 ft. Archeological examination suggests that outer walls were constructed of wood covered in stucco. When completed, the 17,000 sq ft mansion contained three hallways and 23 to 25 rooms, each with its own fireplace. A featured innovation for that time period was the inclusion of two interior bathrooms supplied with rainwater from a tank in the attic. In 1861, cost of construction was about US$175,000 (equal to $5,040,648 today).

The ground floor basement contained a school room, doctor's office, dairy, commissary, and storage rooms. The second floor had a hallway flanked by the master bedroom, a bathroom, two parlors, a study and a library. In the ell off the second floor was the dining room. Connected to the dining room by a dumbwaiter was the kitchen, located on the ground floor. The third floor contained an additional bath and eight more bedrooms. Eight chimneys extended from the slate-covered roof, and a domed cupola with glass walls was constructed above the attic, over the main block of the mansion.

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On April 12, 1861, Smith Daniell died at age 34, just weeks after construction of the mansion was completed. ~ Wikipedia