The land is worth crores of rupees and is located at Maner in suburban Patna, the senior BJP leader said.
The allegations were rubbished by the RJD.
"Why is Sushil Modi after Prasad and his family?" RJD spokesman and MLA Shakti Singh Yadav asked.
Sushil Modi said Misa Bharati, a Rajya Sabha MP, has claimed that her mother-in-law Chandrakanta Devi had gifted the land to her. But her father-in-law's name is Ram Babu Pathik and not Rajeshwar Singh as mentioned in the gift deed, he claimed.
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"In this case it is difficult to infer who the real donee is," Sushil Modi said and claimed that Chandrakanta Devi is neither the mother-in-law of Rohini nor of Misa.
A "clear cut case of forgery and cheating" can be made out against Misa for accepting a gift from a person whom she has shown as her mother-in-law in the deed, he said, adding that Bihar registration department would probe as to who has been gifted the land - Misa or Rohini.
"We have been exposing Lalu Prasad and his family about how they acquired illegal properties through gifts and through shell companies. I have already made disclosures about 10 people who gifted or willed their properties in the name of Lalu Prasad's family members. Chandrakanta Devi is the 11th person," Sushil Modi said.
The other 10 who had gifted their properties to Prasad's family included politicians Raghunath Jha, Kanti Singh, Prabhunath Yadav and Mohammad Shamim besides Sophia Tabbasum, Lalan Choudhary, Hridayanad Choudhary, Rakesh Rabjan, Seema Verma and Subhash Choudhary.