Gentrification in Harlem has occurred for a long time and is still going on today since the 1970s demographic and economic realignments over the past few decades. Harlem has been redeveloping many of its old buildings and building new developments for future residents since many of those abandoned buildings are own by New York City and being sell to the real states for a good price and building them for middle-class residents or people that can afford these new developments. Harlem stretches for more than two miles north of Central Park in Manhattan. Gentrification involved a symbiotic change in social class and physical housing stock, giving indicators from the US census, the most sensitive indicators of gentrification have involved a combination of income and rent data.

The abandonment and destruction of Harlem lead to gentrification because many people were dying and the overdoses of drugs, no educational understanding as well as people having little help to treat all the bad things happening. Crack is a devastating effect on young people in the community. Many people spend all their savings on crack.

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