In the United States, a historic district is a group of buildings, properties, or sites that have been designated by one of several entities on different levels as historically or architecturally significant. Buildings, structures, objects and sites within a historic district are normally divided into two categories, contributing and non-contributing. Districts greatly vary in size: some have hundreds of structures, while others have just a few.
The U.S. federal government designates historic districts through the United States Department of Interior under the auspices of the National Park Service. Federally designated historic districts are listed on the National Register of Historic Places, but listing usually imposes no restrictions on what property owners may do with a designated property. State-level historic districts may follow similar criteria (no restrictions) or may require adherence to certain historic rehabilitation standards. Local historic district designation offers, by far, the most legal protection for historic properties because most land use decisions are made at the local level. Local districts are generally administered by the county or municipal government.
The first U.S. historic district was established in Charleston, South Carolina in 1931, predating the U.S. federal government designation by more than three decades. Charleston city government designated an "Old and Historic District" by local ordinance and created a board of architectural review to oversee it. New Orleans followed in 1937, establishing the Vieux Carré Commission and authorizing it to act to maintain the historic character of the city's French Quarter. Other localities picked up on the concept, with the city of Philadelphia enacting its historic preservation ordinance in 1955.
The regulatory authority of local commissions and historic districts has been consistently upheld as a legitimate use of government police power, most notably in Penn Central Transportation Co. v. City of New York (1978). The Supreme Court case validated the protection of historic resources as "an entirely permissible governmental goal." In 1966 the federal government created the National Register of Historic Places, soon after a report from the U.S. Conference of Mayors had stated Americans suffered from "rootlessness." By the 1980s there were thousands of federally designated historic districts. Some states, such as Arizona, have passed referendums defending property rights that have stopped private property being designated historic without the property owner's consent or compensation for the historic overlay.
Historic districts are generally two types of properties, contributing and non-contributing. Broadly defined, a contributing property is any property, structure or object which adds to the historical integrity or architectural qualities that make a historic district, listed locally or federally, significant. Different entities, usually governmental, at both the state and national level in the United States, have differing definitions of contributing property but they all retain the same basic characteristics. In general, contributing properties are integral parts of the historic context and character of a historic district.
In addition to the two types of classification within historic districts, properties listed on the National Register of Historic Places are classified into five broad categories. They are, building, structure, site, district and object; each one has a specific definition in relation to the National Register. All but the eponymous district category are also applied to historic districts listed on the National Register.
A listing on the National Register of Historic Places is governmental acknowledgment of a historic district. However, the Register is "an honorary status with some federal financial incentives." The National Register of Historic Places defines a historic district per U.S. federal law, last revised in 2004. According to the Register definition a historic district is:
a geographically definable area, urban or rural, possessing a significant concentration, linkage, or continuity of sites, buildings, structures, or objects united by past events or aesthetically by plan or physical development. A district may also comprise individual elements separated geographically but linked by association or history.
Districts established under U.S. federal guidelines generally begin the process of designation through a nomination to the National Register of Historic Places. The National Register is the official recognition by the U.S. government of cultural resources worthy of preservation. While designation through the National Register does offer a district or property some protections, it is only in cases where the threatening action involves the federal government. If the federal government is not involved, then the listing on the National Register provides the site, property or district no protections. For example, if company A wants to tear down the hypothetical Smith House and company A is under contract with the state government of Illinois, then the federal designation would offer no protections. If, however, company A was under federal contract the Smith House would be protected. A federal designation is little more than recognition by the government that the resource is worthy of preservation.
In general, the criteria for acceptance to the National Register are applied consistently, but there are considerations for exceptions to the criteria and historic districts have influence on some of those exceptions. Usually, the National Register does not list religious structures, moved structures, reconstructed structures, or properties that have achieved significance within the last 50 years. However, if a property falls into one of those categories and are "integral parts of districts that do meet the criteria" then an exception allowing their listing will be made. Historic district listings, like all National Register nominations, can be rejected on the basis of owner disapproval. In the case of historic districts, a majority of owners must object in order to nullify a nomination to the National Register of Historic Places. If such an objection occurred, then the nomination would become a determination of National Register eligibility only.
Most U.S. state governments have a listing similar to the National Register of Historic Places. State listings can have similar benefits to federal designation, such as granting qualification and tax incentives. In addition, the property can become protected under specific state laws. The laws can be similar or different from the federal guidelines that govern the National Register. A state listing of a historic district on a "State Register of Historic Places," usually by the State Historic Preservation Office, can be an "honorary status," much like the National Register. For example, in Nevada, listing in the State Register places no limits on property owners. In contrast, state law in Tennessee requires that property owners within historic districts follow a strict set of guidelines, from the U.S. Department of Interior, when altering their properties. Though, according to the National Historic Preservation Act of 1966, all states must have a State Historic Preservation Office, not all states must have a "state historic district" designation. As of 2004, for example, the state of North Carolina had no such designation.
Local historic districts usually enjoy the greatest level of protection legally from any threats that may compromise their historic integrity because many land-use decisions are made at the local level. There are more than 2,300 local historic districts in the United States. Local historic districts can be administered at the county or the municipal level; both entities are involved in land use decisions.
Local historic districts are identified by surveying historic resources and delineating appropriate boundaries that comply with all aspects of due process. Depending on local ordinance or State law, property owners permission may be required; however all owners are to be notified and given a chance to share their opinion. Most local historic districts are constricted by design guidelines that control changes to the properties included in the district. Many local commissions adopt specific guidelines for the "tout ensemble" of each neighborhood, although some smaller commissions rely on the Secretary of Interior Standards. For most minor changes, homeowners can consult with local preservation staff at the municipal office and receive guidance on and permission for the changes. Major changes however, require homeowners to apply for a Certificate of Appropriateness (COA), and the changes may be decided upon by the historic commission or architectural review board. The COA process is carried out with all aspects of due process, with formal notification, hearings, and fair and informed decision making.
According to the National Park Service, historic districts are one of the oldest forms of protection for historic properties. The city of Charleston, South Carolina is credited with beginning the modern day historic districts movement. In 1931 Charleston enacted an ordinance which designated an "Old and Historic District" administered by a Board of Architectural Review. Charleston's early ordinance reflected the strong protection that local historic districts often enjoy under local law. It asserted that no alteration could be made to any architectural features which could be viewed by the public from the street. Local historic districts, as in New Orleans and Savannah, Georgia, predate the Register by 10 years or more as well.
Local historic districts are most likely to generate resistance because of the restrictions they tend to place on property owners. Local laws can cause residents "to comply with (local historic district) ordinances."
The issue of local historic districts and the impact on property values is a concern to many homeowners. The effects have been extensively studied using multiple methodologies including before-and-after analysis and evaluating comparable neighborhoods with and without local designation status. Recent factual analysis has been conducted by independent researchers in a number of states, including New Jersey, Texas, Indiana, Georgia, Colorado, Maryland, North and South Carolina, Kentucky, Virginia, and elsewhere. As stated by economist Donovan Rypkema, "the results of these studies are remarkably consistent: property values in local historic districts appreciate significantly faster than the market as a whole in the vast majority of cases and appreciate at rates equivalent to the market in the worst case. Simply put – historic districts enhance property values." In a 2011 study Connecticut Local Historic Districts and Property Values, it was found that "property values in every local historic district saw average increases in value ranging from 4% to over 19% per year."  Similarly, in New York City between 1980 and 2000, local historic district properties on a price per square foot basis increased in value significantly more than non-designated properties. Equally important, local historic district property values were found to resist market downturns better than historic non-designated properties. A recent study investigating the data on single-family residential mortgage foreclosures and comparable non-designated neighborhoods found that designated properties were significantly less likely to experience foreclosure. Local historic district designation has proven to protect property values from wild fluctuations and provides stability in the housing market.
The original concept of an American historic district was as a protective area surrounding more important, individual historic sites. As the field of historic preservation progressed, those involved came to realize that the structures acting as "buffer zones" were actually key elements of the historic integrity of larger, landmark sites. Preservationists came to the view that districts should be more encompassing, blending together a mesh of structures, streets, open space and landscaping to define the historical character of a historic district.
As early as 1981 the National Trust for Historic Preservation identified 882 American cities and towns that had some form of "historic district zoning" in place; local laws meant specifically to protect historic districts. Before 1966, historic preservation in the United States was in its infancy. That year the U.S. Conference of Mayors penned an influential report which concluded, in part, that Americans suffered from a sense of "rootlessness." They recommended historic preservation to help provide Americans with a sense of orientation. The creation of the National Register of Historic Places in 1966, on the heels of the report, helped to instill that sense of orientation the mayors were looking for. The mayors also recommended that any historic preservation program not focus solely on individual properties but also on "areas and districts which contain special meaning for the community." Local, state and federal historic districts now account for thousands of historic property listings at all levels of government.
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