"I am not aware of the rightness or wrongness of the allegations... transactions between two private individuals cannot be questioned on the basis of certain imputed or implied act of corruption," Chidambaram told reporters in Mumbai.
He said "in fact what I have gathered is" that these transactions are between two private individuals and they have been disclosed in the appropriate income tax and other returns.
"...and nobody has alleged any quid pro quo or any corrupt motive, beyond that I cannot say anything," he added.
Civil society activists Arvind Kejriwal and Prashant Bhushan had on Friday alleged that Vadra had been favoured by realty major DLF.
They demanded probe into Vadra's affairs as also how his business has grown to Rs. 300 crore with a tiny capital base.
Earlier on Saturday, Congress also rejected demands for an inquiry into the allegations.