As rent-gap theory would predict, one of the most visible changes the gentrification process brings is to the infrastructure of a neighborhood. Typically, areas to be gentrified are deteriorated and old, though structurally sound, and often have some obscure amenity such as a historical significance that attracts the potential gentrifiers. Gentry purchase and restore these houses, mostly for single-family homes. In some cases, two or more adjoining property parcels are consolidated into a single lot. Another phenomenon is "loft conversion," which rehabilitates mixed-use areas, often abandoned industrial buildings or run-down apartment buildings to housing for the incoming gentrifiers. Such stabilization of neighbourhoods in decline and the corresponding improvement to the image of such a neighbourhood is one of the arguments used in support of gentrification.