The agency alleged the property in the upmarket south Delhi area of Dera Mandi near Mehrauli was purchased "out of laundered money through shell firms".
It indicated that the funds were paid as quid pro quo by the director of a Delhi-based firm for establishing a hydro power plant in Himachal Pradesh's Chamba district.
The agency issued a provisional order attaching the farmhouse under the provisions of the Prevention of Money Laundering Act (PMLA) and said while the book value of the asset is Rs 6.61 crore, its market value is Rs 27.29 crore, as per a valuation done by the Income Tax department.
The ED said its probe found that "illicit money of Singh was also invested in purchase" of this immovable asset.
"The farmhouse was purchased for an amount of Rs 1.20 crore as per registry value. The payment was made by two cheques of Rs 15 lakh each (Rs 30 lakh) and two cheques of Rs 45 lakh each (Rs 90 lakh).
It said that "incidentally Chandrashekar's company was awarded Saikothi plant in Chamba, Himachal Pradesh" and the cheque amount for purchase of farmhouse was given from his personal bank accounts.
"He (Chandrashekar's) had given a total of Rs 5.9 crore to Singh and family members out of which Rs 90 lakh was transferred from the account of Singh to his son Vikramaditya which was ultimately utilised for purchase of farmhouse by Ms Maple Destinations and Dreambuild Private Limited," it said.
"The directorate (ED) on investigating these firms came to the conclusion that these firms were paper concerns or shell companies opened in name of employees with meagre salary primarily for providing accommodation entries and the addresses of the firms were found fake.
"It was also revealed that even a fake bank account was opened in name of one Gursharan Singh at HDFC Bank and was used to provide entry to Chandrashekar. Another firm Ms Jai Bharat Foods was utilised for showing fake agricultural income against fake bills," it said.
The ED had attached assets valued at Rs 7.93 crore in this case in March last year and with this latest order, the total attachments stand at Rs 35.22 crore.
The latest ED action comes close on the heels of the CBI filing a charge sheet against Singh, a six-time chief minister, and his wife and others for allegedlyamassing assets worth around Rs 10 crore disproportionate to their known sources of income.
The ED had filed a criminal case under the PMLA against the 82-year-old Congress leader and others in 2015 based on a CBI FIR.
Party spokesperson Abhishek Singhvi had said last week that there was "nothing to worry about" in the case as it was done out of "political vendetta" and that Singh would fight it out and emerge victorious.
The BJP has demanded the resignation of Singh, asserting that he has become a "symbol of corruption".
Assembly polls in Himachal Pradesh are slated for later this year.
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