Every three years for the past 25, the city has turned a statistical microscope on itself in the form of its housing survey.

The city's housing survey also showed that the median rent for vacant apartments was $450 a month.

According to the latest city housing survey, there are slightly more than 70,000 rent-controlled apartments left.

According to the city's most recent housing survey, the median unregulated rent in Manhattan in 1993 was $1,030 a month.

Most families who own or rent two homes are middle class, the housing survey showed.

The median household income in New York in 1987 was $20,000 a year, according to the city's most recent housing survey.

The statistics were based on monthly housing surveys, tallies of new construction and other data.

In addition to their increased space, American homes have more amenities than in 1940, when the first housing survey was completed.

Using the most comprehensive housing survey available, the study focuses on the conditions immigrants face in their communities, rather than just their buildings.

The percentages were similar in three previous housing surveys of older Americans taken in 1986, 1989, and 1992.