Lucy Webb Hayes National Training School, 1150 North Capitol Street, NW, and adjacent houses, shortly before they were rzaed in April 1912 to make way for an addition to Sibley Hospital, 2/27/11 Washington Times.

From Sibley's web site:

Sibley Memorial Hospital’s proud heritage can be traced to the year 1890, when the Lucy Webb Hayes National Training School for Deaconesses and Missionaries was founded by The Woman’s Home Missionary Society of the Methodist Episcopal Church in Washington, DC. The school was named for the first president of the Society, Lucy Webb Hayes, wife of Rutherford B. Hayes, 19th President of the United States.

The mission of the school was to train nurse deaconesses. It was soon recognized that a hospital was needed to provide a clinical setting for nursing education and medical and nursing care to a growing Washington, DC, population. William J. Sibley, a member of the Foundry Methodist Church and an early supporter of the work of the National Training School, donated $10,000 for construction of a hospital in memory of his wife, Dorothea Lowndes Sibley. The hospital was dedicated on October 19, 1894, and opened to receive patients in March of 1895.