Short answers, pulled from the story.
Sunder Nursery reopened to the public on the 21st of February 2018. The restoration project began in 2007 and involved removing over 1,000 trucks of rubble to transform the abandoned space into a heritage park.
The Mughals built the original complex known as Azim Bagh or Bagh-e-Azeem in the 16th century. This 90-acre site was originally a secret garden located on the Grand Trunk Road near Humayun's Tomb.
Sunder Nursery is home to over 280 native tree species and serves as Delhi's first arboretum. The park contains rare flora such as the Pink Cedar and uses Geographic Information System technology to map 4,200 trees.
The restoration involved collaboration between the Aga Khan Trust for Culture India, the Archaeological Survey of India, and the Central Public Works Department. International support came from the US Ambassador's Fund for Cultural Preservation and the Norwegian Agency for Development Cooperation.
Six structures within the complex have been designated as UNESCO World Heritage Sites including the Sundarwala Burj, Sundarwala Mahal, and Lakkarwala Burj. These monuments were restored using original orange sandstone and white lime mortar to preserve Mughal craftsmanship.