Although privately owned today, this grand building at No. 17 has a rich history as a health clinic. Built in 1847 as a row of Greek Revival homes, this particular house had several residents until J. Noah Slee, Margaret Sanger's husband, purchased it in 1930 to house his wife's growing Birth Control Clinical Research Bureau. Over 10,000 women were cared for in this clinic over the years, and contraceptive information was shared with all who entered. The clinic continued to function even after Ms. Sanger's death in 1966, and in 1993, under Bill Clinton's presidency, it was finally designated a National Historic Landmark.