The districts allow the property owners to tax themselves for restoration programs.
Over the last 12 years, the state has released 198 bald eagles in a restoration program.
The family began an ambitious restoration program more than 30 years ago.
In the middle of the 19th century, a major restoration programme was needed.
The late 20th century saw an extensive restoration program on the fabric of the building, particularly the west front.
The first time was in late 1986, when the Egyptian authorities began a restoration program that lasted nearly a year.
The Museum also has an ongoing research and restoration program.
By 1980, a restoration programme was put in place that has now been running for over 20 years.
Last spring, it began a restoration program that will replace hundreds of trees in the next few years.
In 2000 Harvard began a restoration program, estimated to take at least six years.