After the abandonment of the highway scheme, the city was left with a large number of historic buildings that were unattractive for the kinds of manufacturing and commerce that survived in the city in the 1970s. The upper floors of many of these buildings had been built as commercial Manhattan lofts, which provided large, unobstructed spaces for manufacturing and other industrial uses. These spaces attracted artists who valued them for their large areas, large windows admitting natural light and low rents. Most of these spaces were also used illegally as living space, despite being neither zoned nor equipped for residential use. This widespread zoning violation was ignored for a long period of time, as the artist-occupants were using space for which there was little demand due to the city's poor economy at the time, and would have lain dormant or been abandoned otherwise.