One proposal for a change was made in 1915 by Thomas Kennard Thomson, an engineer from Buffalo, New York who settled in New York City after making a career in Canada and the United States as a bridge and railway engineer. Thompson opened an office in New York in 1893 which concentrated on the foundations of skyscrapers and underwater caissons used for building bridges. He was involved in the construction of the Singer Tower, the Manhattan Municipal Building and the Mutual Life Building. His 1915 plan was aimed at relieving congestion at the intersection of Fifth Avenue and 42nd Street. Thompson proposed to run 42nd Street "under" Fifth Avenue, and to add a mid-block street between Fifth and Sixth Avenues from 42nd to 43rd Streets to permit the turns that the tunneling would prevent. Why this plan would not simply shift the congestion to the new mid-block connector is not clear. In modern actions to relieve congestion, changes are generally made within the existing right-of-way, therefore without the need to condemn and purchase very expensive Manhattan property.