Former public works head bought property over the road from a potential commercial development in Sea Point on land slated for affordable housing.
In a letter, Sibusiso Sibisi reveals a probe by Naledi Pandor into "alleged maladministration and corruption" - claims he's says he's never heard of.
The PIC is trying to block the Guptas' bid to take a stake at Independent Newspapers, which seems to indicate a hardening attitude towards the family.
The Guptas are now legally fighting for a large stake in Independent Media due to a 2012 pact made between them and the company's chair, Iqbal Surve.
An oil deal originally fronted by Khulubuse Zuma is being probed by US authorities as part of a wider investigation into Och-Ziff Capital Management.
The Panama Papers leak has thrown light on ownership secrecy in a Khulubuse Zuma-fronted oil deal in the Democratic Republic of Congo.
Sars has threatened to sue the M&G over the publishing of an amaBhungane story that lawyers say was "clearly in the public interest" and "lawful".