A major expansion of the IND was first planned in 1929. It would have added over 100 miles of new routes in Manhattan, Brooklyn, Queens, and the Bronx, merging with, intersecting or extending the existing IND rights-of way. It was claimed that this expansion, combined with the operating IRT, BMT, and IND lines, would provide subway service within a half mile of anyone's doorstep within these four boroughs. Pricing—excluding acquisition and equipment costs—was estimated at US$438 million; the entire first phase had only cost US$338 million ("including" acquisition and equipment costs). Not long after these plans were unveiled, the Wall Street Crash of 1929 occurred and the Great Depression was ushered in, and the plans essentially became history overnight. Various forms of the expansion resurfaced in 1939, 1940, 1951, 1968, and 1998 but were never realized. This was the time when the IND had planned widespread elevated construction.