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Redevelopment is any new construction on a site that has pre-existing uses.
Variations on redevelopment include:
- Urban infill on vacant parcels that have no existing activity but were previously developed, especially on Brownfield land, such as the redevelopment of an industrial site into a mixed-use development.
- constructing with a denser land usage, such as the redevelopment of a block of townhouses into a large apartment building.
- Adaptive reuse, where older structures which have outlive their uses are converted into new ones, such as an industrial mill into housing lofts.
Redevelopment projects can be small or large ranging from a single building to entire new neighborhoods or "new town in town" projects.
Redevelopment also refers to state and federal statutes which give cities and counties the authority to establish redevelopment agencies and give the agencies the authority to attack problems of urban decay. The fundamental tools of a redevelopment agency include the authority to acquire real property, the power of eminent domain, to develop and sell property without bidding and the authority and obligation to relocate persons who have interests in the property acquired by the agency. The financing of such operations might come from borrowing from federal or state governments and selling bonds and from Tax Increment Financing.
Other terms sometimes used to describe redevelopment include urban renewal (urban revitalization). While efforts described as urban revitalization often involve redevelopment, they do not always involve redevelopment as they do not always involve the demolition of any existing structures but may instead describe the rehabilitation of existing buildings or other neighborhood improvement initiatives.
A new example of other neighborhood improvement initiatives is the funding mechanism associated with high carbon footprint air quality urban blight. Assembly Bill AB811 is the State of California's answer to funding renewable energy and allows cities to craft their own sustainability action plans. These cutting edge action plans needs the funding structure; which can easily come forward through redevelopment funding.
Urban renewal 
Some redevelopment projects and programs have been incredibly controversial including the Urban Renewal program in the United States in the mid-twentieth century or the urban regeneration program in Great Britain. Controversy usually results either from the use of eminent domain, from objections to the change in use or increases in density and intensity on the site or from disagreement on the appropriate use of tax-payer funds to pay for some element of the project. Urban redevelopment in the United States has been controversial because it forcibly displaces poor and lower middle class populations and turns over their land to wealthy redevelopers for free or for a below-market-value price. They then use that land to construct private shopping malls, office buildings, automobile factories and dealerships, and even gambling casinos. This is done and permitted by American courts in spite of the fact that the Fifth Amendment to the United States Constitution allows the use of eminent domain only for "public use."
The residents displaced by redevelopment are routinely undercompensated, and some (notably month-to-month tenants and business owners) are not compensated at all. Historically, redevelopment agencies have been buying many properties in redevelopment areas for prices below their fair market value, or even below the agencies' own appraisal figures because the displaced people are often unaware of their legal rights and lack the will and the funds to mount a proper legal defense in a valuation trial. Those who do so usually recover more in compensation than what is offered by the redevelopment agencies.
The controversy over misuse of eminent domain for redevelopment reached a climax in the wake of the U.S. Supreme Court's 2005 5 to 4 decision in Kelo v. City of New London, allowing redevelopment takings of sound, unblighted homes, solely to allow redevelopers to put the taken land to more profitable uses and thus increase the revenue flow to the local municipality. The Kelo decision was widely denounced and remains the subject of severe criticism. Remedial legislation has been introduced and in some cases passed, in a number of states.
Notable examples 
- Atlantic Station, Atlanta, Georgia
- Atlantic Yards, New York, New York
- CFB Downsview -> Downsview Park, Toronto, Ontario
- CFB Griesbach -> Griesbach, Edmonton, Alberta
- CN rail yard -> Station Lands (Edmonton), MacEwan University, Edmonton downtown arena; Edmonton, Alberta
- Edmonton City Centre (Blatchford Field) Airport -> Blatchford, Edmonton, Alberta
- HOPE VI
- Lincoln Center for the Performing Arts, New York, New York
- Midtown Detroit, Michigan
- Mission Bay, Treasure Island, Western Addition, and the part of South of Market that become Moscone Center and Yerba Buena Gardens in San Francisco, California
- Pearl District, Portland, Oregon
- Old Port of Montreal, Quebec
- Downtown San Diego, California
- Toronto Waterfront, Toronto, Canada
- West End, Boston, Massachusetts
- World Trade Center site in lower Manhattan following the September 11, 2001 attacks
- Canary Wharf, London (UK)
- Edinburgh Waterfront, UK
- Redevelopment of Norrmalm (Sweden)
- Liverpool One, Liverpool (UK)
- Greenwich Millennium Village, London (UK)
- Panama in Casco Antiguo (Casco Viejo)
See also 
- Adaptive reuse
- Urban Renewal
- Community development
- Community Redevelopment Agency
- Land use conflict
- Business improvement district
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