The documents were recovered during searches at the residences of Delhi Dental Council Registrar Rishiraj, who was arrested on Saturday in a separate case, they said.
Rishiraj and N Pradeep Sharma, a lawyer for the council, were arrested on Saturday night while allegedly receiving a bribe of Rs 4.7 lakh from a doctor, they said.
Later, during the searches at the residence of Mr Rishiraj, the agency recovered the property documents in Satyendar Jain's name at Karala village, cheque books in the name of the AAP leader, his wife Poonam and JJITL estate private limited, the agency sources said.
"The CBI has registered a case...on the allegations of demanding bribe from the complainant for getting him favourable order from the Delhi Dental Council and also for extending help in further legal proceedings in his matter," CBI Spokesperson Abhishek Dayal said.
He said the CBI laid a trap and caught the accused while demanding and accepting the bribe from the complainant.
They said IDBI bank slips showing deposits worth Rs 2 crore in the name of Mr Jain's companies in 2011 were also found during the searches.
"...Three property documents including two sale deeds of land measuring 12 Bigha 2 Bishwa and 8 Bigha 17 Bishwa at Karala village, Delhi; one power of attorney for land measuring 14 Bighas in the village (were found)," CBI spokesperson Abhishek Dayal said in a statement.
Besides, 41 cheque books in his name, his wife's name and in the name of a private estate firm were also found, he added.
The CBI also claimed to have recovered half-a-kilogram of gold and Rs 24 lakh in cash but it is not clear if these are also linked to Mr Jain who is the Delhi minister for Power, PWD and Health, they said.
The sources said the agency will soon be calling the minister for seeking his explanation on recoveries.
The sources said they believe that these documents could have been shifted to the premises of Mr Rishiraj for safe-keeping and to escape the CBI searches in August last year in connection with alleged corruption cases against the minister, they said.
Last year, the agency had booked Satyendar Jain in a case related to disproportionate assets.
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