Harlem is humming with revitalization. Dumpsters in the streets and work permits in the windows proclaim that renovations are in progress. Boarded up buildings are being rehabilitated, and dilapidated shells are getting full makeovers and facelifts. Private investors are rushing in on the heels of earlier developers who were given economic incentives by the city to renovate abandoned properties. Existing structures are being converted to luxury housing, and brand new construction is being built for mixed use.