Facing a deadline to respond to a scathing report by the public protector that comes just weeks before South Africans go to the polls, Zuma's office said he "remains concerned about the allegations of maladministration and impropriety."
Public protector Thuli Madonsela said the upgrades -- which include a helipad, swimming pool, amphitheatre, private clinic and visitors' centre -- were unlawful and said Zuma should refund taxpayers.
Zuma, 71, whose popularity is flagging, pointedly refused to comment in detail about the substance of the report.
Zuma indicated he would not comment in full until the third report, by the Special Investigating Unit -- a body established by presidential proclamation -- was completed.
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A statement said Zuma would then give "full and proper consideration" to the reports and inform parliament about "decisive executive interventions."
The main opposition Democratic Alliance accused Zuma of "playing games with the parliament" and said today's statement was "nothing more than a delaying tactic."
The Democratic Alliance has launched a criminal corruption case against Zuma over the upgrades and plans impeachment proceedings.
"We will continue to push on with our impeachment motion, and we will continue to seek legal advice on what steps can be taken to force the President to abide by these recommendations," said Mazibuko.
The newly-founded Economic Freedom Fighters, led by the erstwhile leader of the ANC youth league, Julius Malema, also laid charges of corruption, theft, fraud and racketeering against Zuma in Pretoria.