The farmhouse, located at 26, Palam Farms in south Delhi's Bijwasan area was attached provisionally under the Prevention of Money Laundering Act or PMLA.
It belongs to Ms Bharti and Mr Kumar and is "held in the name of Ms Mishail Packers and Printers Private Limited", the central probe agency said.
"It was purchased using Rs 1.2 crore involved in money laundering in the year 2008-09," the Enforcement Directorate alleged.
The agency had also conducted raids at this location and few others in July as part of its probe against two brothers, Surendra Kumar Jain and Virendra Jain, and others who have been alleged to have laundered several crore rupees using shell companies.
The Jain brothers were arrested by the Enforcement Directorate under PMLA.
One of the firms that the arrested duo dealt with was Mishail Printers and Packers Private Limited. Ms Bharti and her husband are alleged to have been directors of this firm in the past.
"The company, Ms Mishail Packers and Printers, was registered at the address 25, Tuglak Road, New Delhi till the shares were bought by Bharti. It was only during the year 2009-10 that the address was changed to farm no 26 Palam Farms, VPO Bijwasan, New Delhi. Bharti and Kumar were the directors of the company during the relevant period," it said.
The couple were also interrogated and their statements recorded by the agency in this probe case.
The agency said the Jain brothers, CA Agrawal and the daughter and the son-in-law of the former Bihar chief minister were the "key persons behind the money laundering of Rs 1.2 crore".