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The institution also began to expand its facilities beyond the Seminary building. An observatory was built in 1853; a separate library building in 1870, on the site of the Condit house, which was moved to its present location at 25 Woodbridge Street; a natural science and art building, named after its benefactor Lyman Williston, in 1876; a new observatory in 1881; and the purchase of the former Dwight house for use as both classrooms and residence. By the end of the 1880s an addition had been built on the library, an annex to Lyman Williston Hall, and a small greenhouse at the south end of the gymnasium. To provide for this new construction, and to protect and control the Seminary's water supply, more of the farmland surrounding the Seminary property was purchased. In addition, a generous donor, E.M. Goodnow of Worcester, provided the funds to purchase Prospect Hill, which rose east of Stony Brook. In circa 1882, the College hired the Olmstead firm to lanscape this land into a pastoral and recreation area called Goodnow Park. Trees were planted on it, a rustic bridge was built across the brook, and a pavilion known as the Pepper Box was constructed on a commanding location.