These builders had collected the taxes from prospective buyers but had failed to deposit them.
The Dhingra commission had probed alleged irregularities in the grant of land licences to a firm owned by Vadra and submitted its 182-page report to Khattar on August 31, 2016.
Vadra's interim protection from arrest was extended till April 1.
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Wouldn't have used 182 pages for report if there were no irregularities, said Justice Dhingra.
His mother Maureen was also questioned for some time.
The case relates to allegations of money laundering in the purchase of a London-based property -- located at 12, Bryanston Square -- worth 1.9 million pounds, which is allegedly owned by Vadra.
Special Judge Arvind Kumar also directed him not to tamper with the evidence or influence witnesses and join the investigation as and when called by the investigating officer.
Vadra is expected to be questioned again on either Friday or Saturday.
Enforcement Directorate alleged that he was not cooperating and sought his custodial interrogation.
Vadra, on Facebook termed as "witch hunt" the Enforcement Directorate's action of attaching assets of a firm linked to him, and claimed that it showed "complete misuse of assertion of power".
Vadra was directed by a Delhi court to cooperate with the investigation being carried out by the central probe agency after he knocked on its door seeking anticipatory bail in this case.
Delhi-resident Navneet Mishra is leaving no stone unturned, scouring towns, hotels, camps, hospitals and bus stops in flood-ravaged Uttarakhand in a frantic search for 11 of his family members and friends.
