Citadel Realty and Developers Limited (Formerly known Rohit Pulp & Paper Mills Limited), a unit of Marathon Group was incorporated on July 26, 1960. The name of the Company was changed from Rohit Pulp & Paper Mills Limited to Citadel Realty and Developers Limited on September 24, 2008. The Company is presently specialized into the Slum Rehabilitation Project to rehabilitate a slum in Bhandup, which is in the eastern suburbs of Mumbai. The Company, currently developing project with Shree Swami Smarth Builders in a joint venture in Bhandup.

The company diversified into the manufacture of secondary lead and alloys and set-up a metal division at Daman. The company is the pioneer in introducing the technology for the manufacture of bleached varieties of printing and writing paper from rice straw and agricultural waste, thus helping the nation in the conservation of its precious forest resources.

The company received the National Energy Conservation Award for three consecutive years from the IBPL Urja Energy Conservation Board, and has been acknowledged by the Government of India for its outstanding record in the field of energy conservation.

RPPM has undergone modernisation-cum-expansion of its pulp mills, and has achieved flexibility in using bagasse as an alternative raw material. It's plant to generate electricity by installing wind turbine generators for its captive consumption was commissioned during 1996-97 at a cost of Rs 19.50 Crores. Company already commissioned Diesel Generating Set & Bagasse Fired Boiler for saving in the energy cost.

The Company became potentially a Sick Company as the accumulated losses of the Company exceeded the Net Worth. Subsequent to this, Company made reference to BIFR to consider the proposal for the rehabilitation of the Company.

Accordingly, the Board at its Meeting held on 29th March, 2007 approved the Scheme of Amalgamation of M/s. Marathon Realty Ltd., with the Company, which Scheme due to technical reasons could not be completed. However, Marathon Group had acquired the holding of the erstwhile Promoters belonging to the J M Patel Group. Subsequently the Marathon Group in accordance with the SEBI made a Public Offer and effectively took control of the Company on June 27, 2008.

The Company launched Monte South at Byculla, a joint venture with Adani Realty - one of the most luxurious projects in South Mumbai.

The first phase of the Slum Rehabilitation Project at Bhandup was completed and new houses were handed to the authorities concerned;
In the sale building of the first phase Project around 18% of the construction activities was completed in 2014. In 2017, it ventured into the education space with the revolutionary NEXT School at Mulund W. NEXT is India's 1st Big Picture Learning school.

The Company launched NeoHomes a new generation of urban homes at Bhandup West, in 2018. In 2020, it launched Phase 2 of the Panvel Township.

The Company also has entered into a JV with a group Company for development of a nearby slum Project and the construction activities are yet to commence.