Question: At what point did a project involving more maintenance and restoration begin?
About the article "Notre Dame de Paris", section "Abstract".

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 Reopening and closing 21st century.
Due to economical troubles and safety concerns the park had to close for the 2004 season.
Interest in the park sparked again in 2006 when a Seattle based company, T-Rex Group, leased the park to restore and open portions of the park.
After financial concerns with the park, the T-Rex group did not open the park for another season.
Joyland has now sat since 2006 without any maintenance and continually deteriorates.
2006 Restorations  In 2006 many renovations took place at Joyland, of which were focused more on the aesthetics of the park than actual ride safety.
Roller Coaster did have $10,000 dollars worth of wood repairs done and was renamed "The Nightmare".
The Log Jam, Joyland's only water ride, had pumps replaced and systems checked.
The noticeable difference to the park after the 2006 restoration was the baby blue and pink paint that covers the park.
Vandalism Since its closing in 2004, it has been subjected to numerous incidents of vandalism and looting.
Nearly every building is covered with graffiti, and the vintage sign from the top of the roller coaster has been stolen.
The administration offices have also been destroyed.
Park owner Margaret Nelson was quoted as saying "We're sick.
Our hearts are just sick.
It's not easy, not easy."
Joyland restoration project The Restore Hope organization got involved to regain support to rebuild the park with an emphasis on a community effort and involvement in the restoration process.
The plan is to restore it within the next few years and begin a five step expansion process to help it grow and become an integral part of the Wichita community.
August 2012 fire On August 4, 2012, a maintenance building in the park caught fire.
None of the rides were damaged and the fire was subdued in 30 minutes.
Police suspect arson. 
After its destruction during WWII, Fort Santiago was declared as a "Shrine of Freedom" in 1950.
Its restoration by the Philippine government did not begin till 1953 under the hands of the National Parks Development Committee.
The Intramuros Administration now manages the reconstruction, maintenance, and management of the fort since 1992. 
Investors United School of Real Estate Investing is not a post-secondary career school offering courses to achieve licensure or certification.
Rather, the school’s program is designed to teach what Ian Parrish, the school’s President, calls, "The full anatomy of real estate investing."
Individual courses deal with real estate investing concepts that investors can use to build capital then progress through techniques that examine long-term wealth building and maintenance strategies.
Field training and in-class exercises involving real transactions allow students to develop experience under the guidance of instructors.
Based on the Montessori Method, the school’s curriculum is circular, allowing students to begin the learning process at any point, promoting a structure that places students of differing knowledge levels in the same classroom.
The heterogeneous learning environment fostered by this classroom structure allows more advanced students to reinforce the role of the instructor, and act as guides for the less knowledgeable students.
Currently, the full curriculum of Investors United School of Real Estate Investing is 47 weeks in length and contains 11 courses, field training exercises, 2 free-form discussion sessions per week, and individual coaching sessions scheduled by appointment. 
When altered flow regimes have impacted riparian zone health, re-establishing natural streamflow may be the best solution to effectively restore riparian ecosystems.
The complete removal of dams and flow-altering structures may be required to fully restore historic conditions, but this is not always realistic or feasible.
An alternative to dam removal is for periodic flood pulses consistent with historical magnitude and timing to be simulated by releasing large amounts of water at once instead of maintaining more consistent flows throughout the year.
This would allow overbank flooding, which is vital for maintaining the health of many riparian ecosystems.
However, simply restoring a more natural flow regime also has logistical constraints, as legally appropriated water rights may not include the maintenance of such ecologically important factors.
Reductions in groundwater pumping may also help restore riparian ecosystems by reestablishing groundwater levels that favor riparian vegetation; however, this too can be hampered by the fact that groundwater withdrawal regulations do not usually incorporate provisions for riparian protection.
The negative effects of channelization on stream and riparian health can be lessened through physical restoration of the stream channel.
This can be accomplished by restoring flow to historic channels, or through the creation of new channels.
In order for restoration to be successful, particularly for the creation of entirely new channels, restoration plans must take into account the geomorphic potential of the individual stream and tailor restoration methods accordingly.
This is typically done through examination of reference streams (physically and ecologically similar streams in stable, natural condition) and by methods of stream classification based on morphological features.
Stream channels are typically designed to be narrow enough to overflow into the floodplain on a 1.5 to 2 year timescale.
The goal of geomorphic restoration is to eventually restore hydrologic processes important to riparian and instream ecosystems.
However, this type of restoration can be logistically difficult: in many cases, the initial straightening or modification of the channel has resulted in humans encroaching into the former floodplain through development, agriculture, etc.
In addition, stream channel modification can be extremely costly.
One well-known example of a large-scale stream restoration project is the Kissimmee River Restoration Project in central Florida.
The Kissimmee River was channelized between 1962 and 1971 for flood control, turning a meandering 167 km of river into a 90 km drainage canal.
This effectively eliminated seasonal inundation of the floodplain, causing a conversion from wetland to upland communities.
A restoration plan began in 1999 with the goals of reestablishing ecological integrity of the river-floodplain system.
The project involves dechannelizing major sections of the river, directing water into reconstructed channels, removing water control structures, and changing flow regimes to restore seasonal flooding to the floodplain.
Since the completion of the first phase of restoration, a number of improvements in vegetation and wildlife communities have been documented as the conversion from uplands back to wetlands has begun to take place.
Breaching levees to reconnect streams to their floodplains can be an effective form of restoration as well.
On the Cosumnes River in central California, for example, the return of seasonal flooding to the floodplain as a result of levee breaching was found to result in the reestablishment of primarily native riparian plant communities.
Dechannelisation of shorter reach (2km long) and lowered levee are also been proved to be an effective restoration approach together with natural (or near natural) flooding regime in order to improve soil processes spatial and temporal heterogeneity typical of natural floodplains Stream channels will often recover from channelization without human intervention, provided that humans do not continue to maintain or modify the channel.
Gradually, channel beds and stream banks will begin to accumulate sediment, meanders will form, and woody vegetation will take hold, stabilizing the banks.
However, this process may take decades: a study found stream channel regeneration took approximately 65 years in channelized streams in West Tennessee.
More active methods of restoration may speed the process along. 
Shortly after the fall of the Communist government in Czechoslovakia end of 1989, William Lobkowicz moved to the country of his ancestors to claim the family's former lands and castles.
Lobkowicz's initial work focused on having the property legally restored to the family, a project which took much money and time.
Lobkowicz has since focused on the restoration, maintenance and upkeep of the castles now under his ownership.
Of the more than ten castles and palaces once possessed by the House of Lobkowicz, William Lobkowicz now oversees four of them, including the ancestral Lobkowicz Palace (formerly Pernštejn Palace) at Prague Castle Complex, with some of the remainder having been sold off to finance the restoration as well as long-term maintenance of the other four.
Additional financing has been obtained by converting some of the family properties to hotels and restaurants.
The Lobkowicz Palace includes a restaurant, and guided English-speaking tours are offered.