Register of Historic Places. In June 2014, Amy K. Butler was selected as the church's seventh senior minister, becoming the first woman to hold that job. In September 2018, it was announced Riverside Church would buy the neighboring McGiffert Hall at Claremont Avenue and 122nd Street for $45 million. The dormitory was on land John Rockefeller Jr. had donated to the Union Theological Seminary, and under the donation agreement, the church had the right of first offer to buy the building should it ever be offered for sale. In July 2019, the church's governing council announced Butler's contract would not be renewed, and the Church Council and Butler released a joint letter stating Butler's resignation was mutual. A former Church Council member later said Butler was dismissed after she and several other female staff members had experienced sexual harassment by another former council member, Dr. Edward Lowe. Michael E. Livingston became the interim senior minister. Design Riverside Church occupies a lot between Riverside Drive to the west, 122nd Street to the north, Claremont Avenue to the east, and 120th Street to the south. Riverside Church's main architects; Henry C. Pelton, Francis R. Allen, and Charles Collens; created the general plan for the church. Pelton was most involved with tactical planning while Collens was most involved with the Gothic detail. Sculptural elements were designed by Robert Garrison and constructed by local studios, including the Piccirilli Brothers. The church's interior was designed by Burnham Hoyt. The Martin Luther King Jr. (MLK) Wing to the south of the original building was designed by Collens, Willis & Beckonert and the Stone Gym to the southeast was designed by Louis E. Jallade. , Riverside Church is the tallest church in the United States and is among the world's tallest churches, with a tower rising . Pelton and Collens chose a Gothic architectural style for Riverside Church's exterior; by contrast, the internal structure incorporates modern curtain walls and a steel frame. Fosdick later said the exterior Gothic style is suited to "make people pray" and that the church had "not outgrown Gothic" in that regard. Riverside Church's design is partially derived from Chartres Cathedral in France but also incorporates designs of several Gothic churches in France and Spain.; ; ; ; Pelton and Collens said Chartres would provide the "fundamental principles" for the design of Riverside Church but that Riverside would have a completely different outline.