Building work continued into the 20th century with W. D. Caröe as architect. He added Pitt Building (M staircase) between Ivy Court and Waterhouse's Lodge, and extended New Court with the construction of O staircase on the other side of the Lodge. He linked his two buildings with an arched stone screen, Caröe Bridge, along Pembroke Street in a late Baroque style, the principal function of which was to act as a bridge by which undergraduates might cross the Master's forecourt at first-floor level from Pitt Building to New Court without leaving the college or trespassing in what was then the Fellows' Garden.